Specifications

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Cisco ONS 15216 EDFA Operation Guide
78-12818-01
Chapter 1 Applications
ONS 15216 EDFA1 Operation
Extending ONS 15454 Reach Distance
The Cisco ONS 15216 EDFA1 can be used in conjunction with the ONS 15454 to increase reach distance
if the link loss between nodes in a metro network is greater than 15 dB. The ONS 15216 EDFA1 can be
used as a booster amplifier immediately following the transmitter, as an in-line amplifier at an
intermediate site, or as a pre amplifier just before the receiver.
ONS 15216 EDFA1 Operation
The ONS 15216 EDFA1 consists of a few meters of coiled erbium-doped fiber pumped by a high-power
semiconductor laser operating at 980 nm. Amplification occurs when energy from the pump laser is
transferred via the erbium-doped fiber to incoming optical signals in the 1550 nm window. Each optical
signal leaves the ONS 15216 EDFA1 two hundred times brighter than when it arrived. Figure 1-1 is a
block diagram of the ONS 15216 EDFA1.
Figure 1-1 ONS 15216 EDFA1 Block Diagram
Key Features
The ONS 15216 EDFA1 has the following key features:
• Constant gain of 23 dBm ± 1.25 dBm
• Gain flatness ±1.0 dB (over input range and temperature range)
• Typical transient suppression in less than 200 µs
External AlarmsRx Tx
RS232
-48VDC
Microcontroller
Control Circuit
Isolator Isolator
Output
Monitor
Gain
Flattening
Filter
Pump
Laser
Pump
Laser
61973