Specifications

2-2
Cisco ONS 15216 EDFA Operation Guide
78-12818-01
Chapter 2 Technical Specifications
ONS 15216 EDFA1 Optical Specifications
Maximum Input Power
Caution In the constant-gain mode of operation, the ONS 15216 amplifier is designed to operate up to a
maximum input power of -6 dBm. Optical specifications cannot be maintained with an input power
greater than -6 dBm. Operating at higher powers causes the pumps to be overdriven. Prolonged periods
of operation in this condition can shorten the life time of the ONS 15216 EDFA1.
In this mode, optical attenuators are required to bring total input power to less than -6 dBm.
Upgrading to a Larger Number of Wavelengths
You can ensure a smooth upgrade path from a single channel to the maximum number of channels with
a minimum disruption of service if the per-channel power of the single channel is properly set from the
start. Set the per-channel power so that at full channel loading the total input power is less than –6 dBm
(0.25 mW).
For example, if the maximum number of channels at full loading is 18, then you can calculate the power
per channel by dividing .25 mW by 18, which equals .0138 mW. This number (.0138 mW) in logarithmic
scale is -18.6 dBm.
Use Table 2-2 to calculate per-channel power as a function of the maximum total number of channels at
full loading.
Backward amplified spontaneous
emission (ASE) power
< -20 dBm
Polarization Sensitivity <0.5 dB
Automatic Gain Control (AGC) The ONS 15216 EDFA1 contains
active-gain block with
automatic-gain control loop to
minimize the effects of output
power variations per wavelength
when adding/deleting wavelengths
on the same DWDM ring.
Table 2-1 ONS 15216 Optical Specifications (continued)
Requirement Specifications
Table 2-2 Maximum Power Per Channel
Full Loading-
Number of Channels
Maximum per Channel
Power (mW)
Maximum per Channel
Power (dBm)
1 0.2500 -6.0
2 0.1250 -9.0
3 0.0833 -10.8
4 0.0625 -12.0
5 0.0500 -13.0