Agilent 81618A/9A Optical Head Interface Modules and Agilent 81623B/4B/6B/8B Optical Heads User’s Guide Agilent Technologies
Notices © Agilent Technologies, Inc. 2002 - 2005 No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. Agilent Technologies, Deutschland GmbH Herrenberger Straße 130 71034 Böblingen, Germany.
Agilent Technologies Sales and Service Offices For more information about Agilent Technologies test and measurement products, applications, services, and for a current sales office listing, viesit our web site: http://www.agilent.com/comms/lightwave You can also contact one of the following centers and ask for a test and measurement sales representative.
Table of Contents Getting Started with Optical Heads Safety Considerations Safety Symbols Input Power Limitations Initial Inspection Line Power Requirements Operating Environment Storage and Shipment What is an Optical Head? Analog Output Optical input Heat Sink for 81628B optical Head Attaching the heat sink to the 81628B Optical Head Applicable adapters Mounting Instructions Accessories 9 10 10 11 11 11 12 12 13 15 15 16 16 16 17 19 Modules and Options Connector Adapters - Reference List Specificatio
Total uncertainty Uncertainty at reference conditions Optical Head Specifications Supplementary Performance Characteristics Analog Output Performance Tests 28 29 35 35 37 Equipment Required Test Record Test Failure Instrument Specification Functional Tests Performance Tests For 81628B only Accuracy Test Linearity Test Test Setup +10 dBm Range (equivalent to +40 dBm range for 81628B) Calculation Noise Test Return Loss Test Relative Uncertainty due to Polarization (Optional Test) Relative Uncertainty due
Pipe cleaner Compressed air Additional Cleaning Equipment Microscope with a magnification range about 50X up to 300X Ultrasonic bath Warm water and liquid soap Premoistened cleaning wipes Polymer film Infrared Sensor Card Preserving Connectors Cleaning Instrument Housings Which Cleaning Procedure should I use ? 87 88 89 89 89 90 90 90 90 91 92 93 How to clean connectors 94 How to clean connector adapters 96 How to clean connector interfaces 97 How to clean bare fiber adapters 98 How to clean lenses 99 H
Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
Getting Started with Optical Heads 1 Getting Started with Optical Heads This chapter introduces the features of the Agilent 81623B/4B/6B/8B Optical Heads. Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Input Power Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started with Optical Heads Safety Considerations Safety Considerations The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies Inc. assumes no liability for the customer’s failure to comply with these requirements.
Safety Considerations Getting Started with Optical Heads Input Power Limitations WARN CAU T ION IN G Applicable to Agilent 81628B only Operation above 34 dBm (2.51 W) is at your own risk. Operation at a continuous optical power, or an average optical power, greater than 34 dBm causes, in the specified operating temperature range, the metal parts (connector adapters, screws) to become hotter than the required limit (55°C) of the safety standard IEC 61010-1.
Getting Started with Optical Heads Safety Considerations Operating Environment The safety information in the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, and Agilent 8166A Lightwave Multichannel System User’s Guide summarizes the operating ranges for the Agilent 81618A and Agilent 81619A Optical Head Interface Modules.
What is an Optical Head? Getting Started with Optical Heads What is an Optical Head? An optical head measures the power emitted from a connected singlemode or multi-mode fiber or the power applied in an open parallel beam (with max. 5 mm diameter). The wavelength and power range depends on the sensor element.
Getting Started with Optical Heads What is an Optical Head? Figure 3 shows two types of adapter that are available for connecting the input fiber to an optical head .
What is an Optical Head? Getting Started with Optical Heads Analog Output The analog output is the BNC connector on the back of the optical head. It outputs a voltage directly proportional to the strength of the optical signal at the optical input in the current range. The analog signal is always in the range between 0 and 2V, 2V corresponding to a full power input signal in the current range, 0V corresponding to no input signal. During autoranging, the level to which 2V corresponds changes.
Getting Started with Optical Heads What is an Optical Head? Heat Sink for 81628B optical Head The 81628B optical head has a heat sink that allows an extended operating power range. This heat sink must be mounted on the integrating sphere for operation from 34 dBm to 38 dBm.
What is an Optical Head? Getting Started with Optical Heads Mounting Instructions 1 Check that the blue rubber ring is correctly attached to the integrating sphere and covers the metallic screws as shown in Figure 4 . Figure 4 Attaching the Rubber Ring 2 The heatsink consists of two conical metal parts, the bottom part (smallest diameter at the bottom), and the top part (largest diameter at top).
Getting Started with Optical Heads What is an Optical Head? 3 Attach the upper part of the heat sink to the integrating sphere. Slide the upper part over the connector adapter with the largest diameter facing opposite to the sphere. Tighten the screws with the Allen key enclosed in the Heat Sink Kit (see Figure 6 ).
2 Accessories The Agilent 81618A/9A Optical Head Interface Modules and Agilent 81623B/4B/6B/8B Optical Heads are available in various configurations for the best possible match to the most common applications. This chapter provides information on the available options and accessories. Modules and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Optical Heads (5mm Sensors) . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Connector Adapters - Reference List. . . . . . . . . . .
Accessories Modules and Options Modules and Options Optical Heads (5mm Sensors) Interface Modules Interface Module 81618A Single Head Interface Module 81619A Dual Head Interface Module Accessories 81624CE 4 m extension cable High Power Optical Head for: Connectorized Fiber, Bare Fiber and Open beam NA ≤ 0.3 81628B InGaAs +40 dBm to –60 dBm Connector Adapters (threaded).
Modules and Options Accessories High Power Optical Head (with integrating sphere) High Power Optical Head (with integrating sphere) OPTIONAL Interface Modules Interface Module 81618A Single Head Interface Module 81619A Dual Head Interface Module Accessories 81624CE 4 m extension cable High Power Optical Head for: Connectorized Fiber, Bare Fiber and Open beam NA ≤ 0.3 81628B InGaAs +40 dBm to –60 dBm Connector Adapters (threaded).
Accessories Modules and Options Connector Adapters - Reference List Table 1 Connector Adapters Preferred Adapters Threaded Version Barefiber 81000BT 81000BC FC/PC 81000FA 81001FA SC/PC 81000KA 81001KA MU 81001MA E-2000 81000PA ST 81000VA blank 81001PA 81001ZA LC 810003LA MTP(ribbon) 22 Integral D-shape for 5 mm optical heads Connector Type 810001LA 81003TD Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
3 Specifications The Agilent 81618A/9A Optical Head Interface Modules and Agilent 81623B/4B/6B/8B Optical Heads are produced to the ISO 9001 international quality system standard as part of Agilent Technologies’ commitment to continually increasing customer satisfaction through improved quality control. Specifications describe the modules’ and heads’ warranted performance. Supplementary performance characteristics describe the modules’ and heads’ non-warranted typical performance.
Specifications Definition of Terms Definition of Terms This section defines terms that are used both in this chapter and “Performance Tests” on page 37. Generally, all specifications apply for the given environmental conditions and after warmup time. Measurement principles are indicated. Alternative measurement principles of equal value are also acceptable.
Definition of Terms Specifications Averaging Time Time defining the period during which the power meter takes readings for averaging. At the end of the averaging time the average of the readings is available (display- or memory-update). Symbol Tavg. Linewidth FWHM spectral bandwidth. The 3 dB width of the optical spectrum, expressed in Hertz. Symbol: ∆f. Noise The peak-to-peak change of displayed power level with zero input power level (dark).
Specifications Definition of Terms Power range The power range is defined from the highest specified input power level to the smallest input power level that causes a noticeable change of displayed power level. Conditions: wavelength, averaging time as specified. Wavelength range The range of wavelengths for which the power meter is calibrated. Note: Selectable wavelength setting of the power meter for useful power measurements (operating wavelength range).
Definition of Terms Specifications Relative uncertainty due to speckle noise This is the uncertainty of the power reading when using a coherent source. This is due to a variation of the power meters responsivity caused by optical interference1 between different optical paths within the power meters optical assembly. Conditions: constant wavelength, constant power level, angled connector as specified, linewidth of source as specified, temperature as specified.
Specifications Definition of Terms Return loss The ratio of the incident power to the reflected power expressed in dB. Symbol: RL. P in RL = 10 log -------------P b ac k Conditions: the return loss excludes any reflections from the fiber end used as radiation source. Spectral width of optical source Full width at half maximum. The 3 dB width of the optical spectrum, expressed in nm. Symbol: FWHM.
Optical Head Specifications Specifications Optical Head Specifications All optical heads have to be operated with the single (Agilent 81618A) or dual (Agilent 81619A) Interface Modules. Table 2 Optical Head Specifications Agilent 81623B Agilent 81623B Calibration option C85 / C86 Agilent 81623B Calibration option C01 / C02 Ge, ∅ 5 mm Sensor element Wavelength range 750 nm to 1800 nm Power range –80 dBm to +10 dBm Standard SM and MM max 100 µm core size, NA ≤ 0.
Specifications Optical Head Specifications Averaging time (minimal) 100 µs Analog Output included Dimensions 57 mm x 66 mm x 156 mm Weight 0.5 kg Recommended recalibration period 2 years Operating temperature 0°C to 40°C Humidity Non-condensing Warm-up time 40 min [1] Reference conditions: . • Power level 10 µW (-20 dBm), continuous wave (CW) • Parallel beam, 3 mm spot diameter on the center of the detector • Ambient temperature 23°C ± 5°C • On day of calibration (add ± 0.
Optical Head Specifications Specifications Table 3 High Power Optical Head Specifications Agilent 81624B Calibration option C01 / C02 Agilent 81624B Agilent 81626B Calibration option Agilent 81626B C01 / C02 InGaAs, ∅ 5 mm InGaAs, ∅ 5mm Wavelength range 800 nm to 1700 nm 850 nm to 1650nm Power range –90 dBm to +10 dBm –70 to +27 dBm (1250 nm to 1650 nm) Sensor element –70 to +23 dBm (850 nm to 1650 nm) Applicable fiber type Parallel beam max ∅ 4 mm Open beam Uncertainty at refer ence condit
Specifications Optical Head Specifications 0°C to 40°C 0°C to +35°C[9] Non-condensing Non-condensing 40 min 40 min Operating temperature Humidity Warm-up time [1] Reference conditions: • Power level 10 µW (-20 dBm), continuous wave (CW) [2] • Parallel beam, 3 mm spot diameter on the center of the detector • Ambient temperature 23°C ± 5°C • On day of calibration (add ± 0.3% foraging over one year, add ± 0.
Optical Head Specifications Specifications Table 4 Agilent 81628B Specification Agilent 81628B with integrating sphere Sensor element InGaAs Wavelength range 800 nm to 1700 nm Power range –60 dBm to +40 dBm (800 nm to 1700 nm) For operation higher than 34 dBm see safety note Damage Power 40.5 dBm Applicable fiber type Single mode NA ≤ 0.2, Multimode NA ≤ 0.4 ∅ ≤ 3mm center of sphere Open beam Uncertainty at reference conditions [1] [8] ± 3.
Specifications Optical Head Specifications Dimensions 55mm x 80 mm x 250 mm Weight 0.9 kg (without heat sink) Recommended Recalibration period 2 years Operating temperature [7] 0°C to +40°C Humidity Non-condensing Warm-up time 40 min Reference conditions: [1] Power level 10 µW (-20 dBm), continuous wave (CW) • Averaging time 1s • Parallel beam, 3 mm, center of sphere input • Ambient temperature 23 °C ± 5 °C • On day of calibration (add ± 0.3 % for aging over one year, add ± 0.
Supplementary Performance Characteristics Specifications Supplementary Performance Characteristics Analog Output Bandwith ≥DC, ≤300 to 5000 Hz depending on range and optical head. Output voltage 0 to 2 V non-terminated Output impedance 600 Ohm typ. Max. input voltage ±10V Table 5 3dB-bandwidth of the Analog Output Range Bandwidth 81622B/3B Bandwidth 81624B/6B/7B Bandwidth 81628B +40 dBm N/A N/A 3.5 kHz +30 dBm N/A N/A 3.5 kHz +20 dBm N/A N/A 3.5 kHz +10 dBm 5.0 kHz 5.0 kHz 3.
Specifications 36 Supplementary Performance Characteristics Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
4 Performance Tests The procedures in this section test the performance of the instrument. The complete specifications to which Agilent 81623B/4B/6B/8B Optical Heads are tested are given in “Specifications” on page 23. All tests can be performed without access to the interior of the instrument. The test equipment given corresponds to tests carried out with Diamond HMS - 10 connectors. Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Test Record . . . . . . . . . . . . . .
Performance Tests Equipment Required Equipment Required Equipment required for the performance test is listed in the table below. Any equipment that satisfies the critical specifications of the equipment given in the table may be substituted for the recommended models.
Equipment Required Performance Tests Agilent 81101PC (1 ea) Agilent 81102SC (1 ea) Agilent 81113PC (3 ea) Agilent 81113SC (1 ea) Agilent 81000AA (2 ea) Agilent 81000SA (1 ea) Agilent 81001SA (1 ea) Agilent 81000FA (1/2* ea) Agilent 81001FA (1 ea) Agilent 81000AI (3 ea) Agilent 81000FI (3 ea) Agilent 81000SI (4 ea) PN 5040-9351 – – – – – – – – – – – – – – – – – – – – – – – – – – – – x x x x – x – x x x x – – x x x x – x – x x x x – – x x x x – x – x x x x 81628B 81626B Plastic Cap 81624B Connecto
Performance Tests Test Record Test Record Results of the performance test may be tabulated on the Test Record provided at the end of the test procedures. It is recommended that you fill out the Test Record and refer to it while doing the test. Since the test limits and setup information are printed on the Test Record for easy reference, the record can also be used as an abbreviated test procedure (if you are already familiar with the test procedures).
Test Failure Performance Tests Test Failure If the Agilent 81618A/19A Interface module or Agilent 81623B/4B/6B/8B Optical Head fails any performance test, return the instrument to the nearest Agilent Technologies Sales / Service Office for repair.
Performance Tests Instrument Specification Instrument Specification Specifications are the performance characteristics of the instrument that is certified. These specifications, listed in “Specifications” on page 23, are the performance standards or limits against which the Agilent 81623B/4B/6B/8B Optical Head can be tested. “Specifications” on page 23 also lists some supplemental characteristics of the Agilent 81623B/4B/6B/8B Optical Head.
Functional Tests Performance Tests Functional Tests The functional test applies to the Agilent 81618A/19A Interface modules. Mainframe 8163A/B with 8161xA Interface Module as DUT Figure 7 Functional Test Setup 1 Set up the equipment as shown in Figure 7 2 If you are using an Agilent 81619A Interface module connect one optical head to channel 1 and the other to channel 2 3 Power up the mainframe. If the Agilent 81618A/19A passes all self-tests, the module is considered fully functional.
Performance Tests Performance Tests Performance Tests The performance tests given in this section includes the Accuracy Test, the Linearity Test, the Return Loss Test (for the 81623B/26B) and the Noise Test. The performance tests for the Agilent 81624B/6B also include – as optional tests – the Relative Polarization Uncertainty and the Relative Interference Uncertainty Test. Perform each step in the order given, using the corresponding test equipment.
Performance Tests Performance Tests For 81628B only The performance test for the 81628B High Power Head does not differ from the test procedure for an optical head without an integrating sphere, except for the linearity test. The integrating sphere of the 81628B has to be disconnected for testing the linearity of the head alone. A special adapter and a disconnecting tool are necessary for disconnection. These tools are included in the Performance Test Kit (order P/N 81628-68705).
Performance Tests Performance Tests Accuracy Test This performance test applies to Agilent 81623B/4B/6B/8B Optical Heads. N O TE The linearity test must only be performed at either 1310 nm or 1550 nm. The accuracy test must be performed in the -20 dBm range at 10.0 µW at both 1310 nm and 1550 nm. Test Setup 1 Make sure that cable connector, detectors and adapters are clean. 2 Connect the equipment as shown in Figure 8 .
Performance Tests Performance Tests 3 Move to the Laser Source channel, move to the wavelength parameter, [λ], press Enter, select the lower wavelength source, and press Enter. 4 If you are using an Agilent 81657A Laser Source make sure you initialize the Agilent 8156A Optical Attenuator with 30 dB attenuation. 5 Turn the instruments on, enable the laser source and allow the instruments to warm up for at least 20 minutes.
Performance Tests Performance Tests Linearity Test This performance test applies to Agilent 81623B/4B/6B/8B Optical Heads N O TE 81628B only: You have to disconnect the integrating sphere of the 81628B head to verify the linearity. Use the 81102SC high return loss patchcord to connect the DUT to the attenuator.
Performance Tests Performance Tests Test Setup N O TE • Do not turn the laser off during the measurement! • Clean all connectors carefully before you start with the measurement! N O TE The linearity test checks the in-range linearity as well as the range discontinuity.
Performance Tests Performance Tests f N O TE Press the [Menu] softkey and move to , press Enter, move to <3>, press Enter and press [Close]. Always include at least three digits after the decimal point when you note a power reading. 6 Initialize the two attenuators as follows: a Set the attenuation of the 8156A #221 with Monitor Output (referred to as Atty1) to 0 dB. b Set the attenuation of the other 8156A (referred to as Atty2) to 35 dB.
Performance Tests Performance Tests Switch to the 20 dBm range and note both power readings as n=0 in the test record, which is given at the end of the test descriptions (#0, that is n=0). Switch back to the 10 dBm range. 2 Note both power readings as the first value (n=1) in the test record, which is given at the end of the test descriptions (#1). 3 Increase the attenuation of Atty1 until the power reading of the DUT shows about +2.8 dBm.
Performance Tests Performance Tests 5 Switch down to the previous range (-10 dBm, 20 dBm for the 81628B) and note the values again (#7). 6 Increase the attenuation of Atty1 by 10 dB and note the results in the test record (#8). 7 At the DUT, 8162xB, press [Menu], move to , press Enter, move to <-20 dBm>(10 dBm for the 81628B), press Enter and press [Close]. 8 If necessary, adjust the attenuation of Atty1 in order to be on the upper limit of the range (i.e. -x7.y dBm).
Performance Tests Performance Tests 6 Increase the attenuation of Atty1 by 10 dB and note the results in the test record (#14). 7 On the DUT switch one range down to the -40 dBm (-10 for 81628B) range. Change Setup 1 Disable Atty1 and switch the output with the monitor output. 2 Set the attenuation of Atty1 to 35 dB and of Atty2 to 25 dB. 3 Enable Atty1 again. 4 Adjust the attenuation of both attenuators in the following order: • Atty1: DUT Power Meter shows a reading of -37.2 dBm.
Performance Tests Performance Tests note the power readings (#18). 5 Switch one range down (-50 dBm, -20 dBm for the 81628B)) and note the power readings (#19). 6 Increase the attenuation of Atty1 by 10 dB and note the results in the test record (#20). Calculation 12 Calculate the non-linearity using the formulas given in the test record.
Performance Tests Performance Tests Calculations Conversion [dBm] → [mW] n Ref / R DUT / D [mW] [mW] 1 1,90919E-05 8,76455761 2 4,19856E-06 1,926060834 3 1,87845E-05 4 Calculation as given Relation1 / A Calculation as given Relation2 / B Non-Linearity = An*Bn (NLn ± 1+1) - 1 [%] 0,1 1,928590397 1,0003454 0,9995626 0,03 1,8791E-05 1,929434323 0,1006955 5 1,89217E-06 0,194352441 6 1,8896E-05 0,194455396 1,0003685 7 1,8903E-05 0,194549447 0,1000046 10,002994 0,09 8 1,89
Performance Tests Performance Tests Figure 10 Example of Linearity Test Result.
Performance Tests Performance Tests Noise Test This performance test applies to Agilent 81623B/4B/6B/8B Optical Heads. N O TE You must insert a module or a blank panel in the second channel position of the Agilent 8163A/B Lightwave Multimeter before you perform the noise measurement.
Performance Tests Performance Tests Return Loss Test This performance test applies to Agilent 81623B/4B/6B/Optical Heads. 1 Make sure that all connectors are clean. 2 Connect the equipment as shown in Figure 11 . 3 Press [Preset] on the mainframe. Figure 11 Return Loss Reference Setup N O TE CAU T ION To ensure traceability, use the 81610CC Reference Cable for calibration measurements. Do not use the 81610CC Reference Cable for measurements on a Device Under Test.
Performance Tests Performance Tests 6 At the Power Meter: a Set the averaging time [AvTime] to 1s b Set the wavelength [λ] to the wavelength of the RTL source. c Set [Pwr unit] to . 7 At the Return Loss Module: a Set the averaging time [AvTime] to 1s. b Enter the Return Loss Reference value RLref of the 81610CC reference cable for this wavelength. c Press [RefCal to calibrate the Return Loss module at reference condition. 8 At the Power Meter press [Disp -> Ref].
Performance Tests Performance Tests Relative Uncertainty due to Polarization (Optional Test) N O TE The performance test "Relative Uncertainty due to Polarization" is optional, since the polarization is given with the production of the unit by mechanical and optical cavities and is unchanged by normal use of the sensor module. Refer to Figure 13 for a setup to verify the relative uncertainty due to polarization of the sensor module.
Performance Tests Performance Tests Figure 13 Measurement Setup for PDL Test Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition 61
Performance Tests Performance Tests Relative Uncertainty due to Interference (Optional Test) N O TE The performance test "Relative Uncertainty due to Interference" is optional, since the interference is given with the production of the unit by mechanical and optical cavities and is unchanged by normal use of the sensor module. Refer to Figure 14 for a test setup to verify the relative uncertainty due to interference within the optical head optical assembly.
Performance Tests Performance Tests Figure 14 Setup for Relative Uncertainty due to Interference Measurement Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition 63
Performance Tests Performance Tests Theoretically, both Power Meters are monitoring the power ratio over the variable wavelength in a predefined range as shown in Figure 15 . Ensure that the tunable laser source is mode-hop free in the tested wavelength range.
Performance Tests Performance Tests Performance Test for the Agilent 81623B Page 1 of 3 Model Agilent 81623B Optical Head_ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev.
Performance Tests Performance Tests Performance Test for the Agilent 81623B Test Equipment Used Page 2 of 3 Description Model No. Trace No 1a1 Lightwave Multimeter (Std.
Performance Tests Performance Tests Performance Test for the Agilent 81623B Page 3 of 3 Model Agilent 81623B Optical Head Test No. Test Description I Accuracy Test Min. Spec. Result Max. Spec. 9.72 µW _______ 10.28 µW measured at _______ nm (1550nm) Output Power 9.72 µW _______ 10.28 µW Linearity Test Measurement Uncertainty [µW] For Calculations you may want to use the appropriate sheet Range PDUT [dBm] PDUT [dBm] Loss [%] +10 +9 ________ _______ <± 1.
Performance Tests Performance Tests Performance Test for the Agilent 81624B Page 1 of 3 Model Agilent 81624B Optical Head_ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev.
Performance Tests Performance Tests Performance Test for the Agilent 81624B Test Equipment Used Page 2 of 3 Description Model No. Trace No 1a1 Lightwave Multimeter (Std.
Performance Tests Performance Tests Performance Test for the Agilent 81624B Page 3 of 3 Model Agilent 81624B Optical Head Test No. Test Description I Accuracy Test Min. Spec. Result 9.72 µW _______ 10.28 µW measured at _______ nm (1550nm) Output Power 9.72 µW _______ 10.28 µW Linearity Test Measurement Uncertainty For Calculations you may want to use the appropriate sheet Range PDUT [dBm] PDUT [dBm] Loss [%] +10 +9 ________ _______ <± 0.46 % +10 +3 ________ _______ <± 0.
Performance Tests Performance Tests Performance Test for the Agilent 81626B Page 1 of 3 Model Agilent 81626B Optical Head_ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev.
Performance Tests Performance Tests Performance Test for the Agilent 81626B Test Equipment Used Page 2 of 3 Description Model No. Trace No 1a1 Lightwave Multimeter (Std.
Performance Tests Performance Tests Performance Test for the Agilent 81626B Page 3 of 3 Model Agilent 81626B Optical Head Min. Test No. Test Description I Accuracy Test Spec. Result Max. Measurement Spec. Uncertainty [µW] 9.64 µW _______ 10.36 µW measured at _______ nm (1550nm) Output Power 9.64 µW _______ 10.36 µW Linearity Test For Calculations you may want to use the appropriate sheet Range PDUT [dBm] PDUT [dBm] Loss [%] +20 +9 ________ _______ <± 1.
Performance Tests Performance Tests N O TE 74 The nonlinearity of the 81626B is not usually tested to the specified power level of +27 dBm. Instead, limited testing up to +9 dBm is used to test the electronic circuitry of the 81626B. Above +9 dBm the largest contribution to nonlinearity is from the absorbing glass filter (which is tested on a sample basis) that does not change its linearity with time.
Performance Tests Performance Tests Performance Test for the Agilent 81628B Page 1 of 3 Model Agilent 81628B Optical Head_ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev.
Performance Tests Performance Tests Performance Test for the Agilent 81628B Test Equipment Used Page 2 of 3 Description Model No. Trace No 1a1 Lightwave Multimeter (Std.
Performance Tests Performance Tests Performance Test for the Agilent 81628B Page 3 of 3 Model Agilent 81628B Optical Head Test No. Test Description I Linearity Test (without sphere) II III Report No.________ Date ________________ Min. Spec. Max. Spec. Result For Calculations you may want to use the appropriate sheet Range PDUT [dBm] PDUT [dBm] Loss [%] +40 +9 ________ _______ <± 0.46 % +40 +3 ________ _______ <± 0.46 % +30 +3 ________ _______ <± 0.
Performance Tests Performance Tests Calculation Sheets Table 7 Calculation Sheet for Linearity Measurement (81623B, 81624B, 81628B) 78 =Dn/Rn+1 DUT Power [dBm] Reference Level 0.
Performance Tests Performance Tests Table 8 Calculation Sheet for Linearity Measurement (81626B) =Dn/Rn+1 DUT Power [dBm] Reference Level Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition 0.
Performance Tests 80 Performance Tests Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
5 Cleaning Information The following Cleaning Information contains some general safety precautions, which must be observed during all phases of cleaning. Consult your specific optical device manuals or guides for full information on safety matters. Please try, whenever possible, to use physically contacting connectors, and dry connections. Clean the connectors, interfaces, and bushings carefully after use.
Cleaning Information Cleaning Instructions for this Device Cleaning Instructions for this Device This Cleaning Information applies to a number of different types of Optical Equipment. Sections of particularly relevance to the following devices are crossreferenced below. 81000xA Optical Head Adapters When using optical head adapters, periodically inspect the optical head's front window (see “How to clean connector adapters” on page 96 for cleaning procedures).
Safety Precautions Cleaning Information Safety Precautions Please follow the following safety rules: • Do not remove instrument covers when operating. • Ensure that the instrument is switched off throughout the cleaning procedures. • Use of controls or adjustments or performance of procedures other than those specified may result in hazardous radiation exposure. • Make sure that you disable all sources when you are cleaning any optical interfaces.
Cleaning Information Why is it important to clean optical devices? Why is it important to clean optical devices? In transmission links optical fiber cores are about 9 µm (0.00035") in diameter. Dust and other particles, however, can range from tenths to hundredths of microns in diameter. Their comparative size means that they can cover a part of the end of a fiber core, and as a result will reduce the performance of your system.
What do I need for proper cleaning? Cleaning Information What do I need for proper cleaning? Some Standard Cleaning Equipment is necessary for cleaning your instrument. For certain cleaning procedures, you may also require certain Additional Cleaning Equipment.
Cleaning Information What do I need for proper cleaning? Isopropyl alcohol This solvent is usually available from any local pharmaceutical supplier or chemist's shop. If you use isopropyl alcohol to clean your optical device, do not immediately dry the surface with compressed air (except when you are cleaning very sensitive optical devices). This is because the dust and the dirt is solved and will leave behind filmy deposits after the alcohol is evaporated.
What do I need for proper cleaning? Cleaning Information Soft tissues These are available from most stores and distributors of medical and hygiene products such as supermarkets or chemists' shops. We recommend that you do not use normal cotton tissues, but multilayered soft tissues made from non-recycled cellulose. Cellulose tissues are very absorbent and softer. Consequently, they will not scratch the surface of your device over time.
Cleaning Information What do I need for proper cleaning? Compressed air Compressed air can be purchased from any laboratory supplier. It is essential that your compressed air is free of dust, water and oil. Only use clean, dry air. If not, this can lead to filmy deposits or scratches on the surface of your connector. This will reduce the performance of your transmission system. When spraying compressed air, hold the can upright.
What do I need for proper cleaning? Cleaning Information Additional Cleaning Equipment Some Cleaning Procedures need the following equipment, which is not required to clean each instrument: • Microscope with a magnification range about 50X up to 300X • Ultrasonic bath • Warm water and liquid soap • Premoistened cleaning wipes • Polymer film • Infrared Sensor Card Microscope with a magnification range about 50X up to 300X A microscope can be found in most photography stores, or can be obtained through or
Cleaning Information What do I need for proper cleaning? Warm water and liquid soap Only use water if you are sure that there is no other way of cleaning your optical device without causing corrosion or damage. Do not use hot water, as this may cause mechanical stress, which can damage your optical device. Ensure that your liquid soap has no abrasive properties or perfume in it. You should also avoid normal washing up liquid, as it can cover your device in an iridescent film after it has been air dried.
Preserving Connectors Cleaning Information Preserving Connectors Listed below are some hints on how best to keep your connectors in the best possible condition. Making Connections Before you make any connection you must ensure that all cables and connectors are clean. If they are dirty, use the appropriate cleaning procedure. When inserting the ferrule of a patchcord into a connector or an adapter, make sure that the fiber end does not touch the outside of the mating connector or adapter.
Cleaning Information Cleaning Instrument Housings Cleaning Instrument Housings Use a dry and very soft cotton tissue to clean the instrument housing and the keypad. Do not open the instruments as there is a danger of electric shock, or electrostatic discharge. Opening the instrument can cause damage to sensitive components, and in addition your warranty will be voided.
Which Cleaning Procedure should I use ? Cleaning Information Which Cleaning Procedure should I use ? Light dirt If you just want to clean away light dirt, observe the following procedure for all devices: • Use compressed air to blow away large particles. • Clean the device with a dry cotton swab. • Use compressed air to blow away any remaining filament left by the swab. Heavy dirt If the above procedure is not enough to clean your instrument, follow one of the procedures below.
Cleaning Information Which Cleaning Procedure should I use ? How to clean connectors Cleaning connectors is difficult as the core diameter of a single-mode fiber is only about 9 µm. This generally means you cannot see streaks or scratches on the surface. To be certain of the condition of the surface of your connector and to check it after cleaning, you need a microscope.
Which Cleaning Procedure should I use ? Cleaning Information An Alternative Procedure A better, more gentle, but more expensive cleaning procedure is to use an ultrasonic bath with isopropyl alcohol. 1 Hold the tip of the connector in the bath for at least three minutes. 2 Take a new, dry soft tissue and remove the alcohol, dissolved sediment and dust, by rubbing gently over the surface using a small circular movement. 3 Blow away any remaining lint with compressed air.
Cleaning Information Which Cleaning Procedure should I use ? How to clean connector adapters CAU T ION Some adapters have an anti-reflection coating on the back to reduce back reflection. This coating is extremely sensitive to solvents and mechanical abrasion. Extra care is needed when cleaning these adapters. Preferred Procedure Use the following procedure on most occasions. 1 Clean the adapter by rubbing a new, dry cotton swab over the surface using a small circular movement.
Which Cleaning Procedure should I use ? Cleaning Information How to clean connector interfaces CAU T ION Be careful when using pipe cleaners, as the core and the bristles of the pipe cleaner are hard and can damage the interface. Do not use pipe cleaners on optical head adapters, as the hard core of normal pipe cleaners can damage the bottom of an adapter. Preferred Procedure Use the following procedure on most occasions.
Cleaning Information Which Cleaning Procedure should I use ? How to clean bare fiber adapters Bare fiber adapters are difficult to clean. Protect from dust unless they are in use. CAU T ION Never use any kind of solvent when cleaning a bare fiber adapter as solvents can: • Damage the foam inside some adapters. • Deposit dissolved dirt in the groove, which can then dirty the surface of an inserted fiber. Preferred Procedure Use the following procedure on most occasions.
Which Cleaning Procedure should I use ? Cleaning Information How to clean lenses Some lenses have special coatings that are sensitive to solvents, grease, liquid and mechanical abrasion. Take extra care when cleaning lenses with these coatings. Lens assemblies consisting of several lenses are not normally sealed. Therefore, use as little alcohol as possible, as it can get between the lenses and in doing so can change the properties of projection.
Cleaning Information Which Cleaning Procedure should I use ? How to clean instruments with a fixed connector interface You should only clean instruments with a fixed connector interface when it is absolutely necessary. This is because it is difficult to remove any used alcohol or filaments from the input of the optical block. It is important, therefore, to keep dust caps on the equipment at all times, except when your optical device is in use.
Which Cleaning Procedure should I use ? Cleaning Information How to clean instruments with a physical contact interface Remove any connector interfaces from the optical output of the instrument before you begin the cleaning procedure. Cleaning interfaces is difficult as the core diameter of a single-mode fiber is only about 9 µm. This generally means you cannot see streaks or scratches on the surface.
Cleaning Information Which Cleaning Procedure should I use ? How to clean instruments with a recessed lens interface WARN CAU T ION IN G For instruments with a deeply recessed lens interface (for example the Agilent 81634A Power Sensors) do NOT follow this procedure. Alcohol and compressed air could damage your lens even further. Keep your dust and shutter caps on when your instrument is not in use. This should prevent it from getting too dirty.
Which Cleaning Procedure should I use ? Cleaning Information How to clean optical devices which are sensitive to mechanical stress and pressure Some optical devices, such as the Agilent 81000BR Reference Reflector, which has a gold plated surface, are very sensitive to mechanical stress or pressure. Do not use cotton swabs, soft tissues or other mechanical cleaning tools, as these can scratch or destroy the surface. Preferred Procedure Use the following procedure on most occasions.
Cleaning Information Which Cleaning Procedure should I use ? How to clean metal filters or attenuator gratings This kind of device is extremely fragile. A misalignment of the grating leads to inaccurate measurements. Never touch the surface of the metal filter or attenuator grating. Be very careful when using or cleaning these devices. Do not use cotton swabs or soft tissues, as there is the danger that you cannot remove the lint and that the device will be destroyed by becoming mechanically distorted.
Additional Cleaning Information Cleaning Information Additional Cleaning Information The following cleaning procedures may be used with other optical equipment: • How to clean bare fiber ends • How to clean large area lenses and mirrors How to clean bare fiber ends Bare fiber ends are often used for splices or, together with other optical components, to create a parallel beam. The end of a fiber can often be scratched. You make a new cleave. To do this: 1 Strip off the cladding.
Cleaning Information Additional Cleaning Information How to clean large area lenses and mirrors Some mirrors, as those from a monochromator, are very soft and sensitive. Therefore, never touch them and do not use cleaning tools such as compressed air or polymer film. Some lenses have special coatings that are sensitive to solvents, grease, liquid and mechanical abrasion. Take extra care when cleaning lenses with these coatings. Lens assemblies consisting of several lenses are not normally sealed.
Additional Cleaning Information Cleaning Information 3 Wash off the emulsion with water, being careful to remove it all, as any remaining streaks can impair measurement accuracy. 4 Take a new, dry soft tissue and remove the water, by rubbing gently over the surface using a small circular movement. 5 Blow away remaining lint with compressed air. Alternative Procedure A To clean lenses that are extremely sensitive to mechanical stress or pressure you can also use an optical clean polymer film.
Cleaning Information Other Cleaning Hints Other Cleaning Hints Selecting the correct cleaning method is an important element in maintaining your equipment and saving you time and money. This Appendix highlights the main cleaning methods, but cannot address every individual circumstance. This section contain some additional hints which we hope will help you further. For further information, please contact your local Agilent Technologies representative.
Index Index A P Accuracy Test 46 Performance characteristics supplementary 35 Accuracy test Setup 46 Analog output 15 bandwidth 35 Attaching the heat sink 16 Averaging time 24 C Calculation sheet linearity test 78 Cleaning 82 Cleaning connector interfaces 97 Performance Tests 81623B 65 81624B 68 81626B 71 81628B 75 Calculation Sheet for Linearity Measurement (81622B/26B) 79 Calculation Sheet for Linearity Measurement (81623B/4B/7B/8B) 78 Performance tests 44 Power range 26 R Cleaning materials 85 C
Index 110 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B Optical Heads, Fourth Edition
www.agilent.
