Broadcast Edfa Power And Gain Setup - Cisco GS7000 Installation And Configuration Manual

Laser Temperature Set Point Adjustment
In an effort to reduce EDFA power consumption, the laser temperature set point is
changed based on EDFA module temperature and type of laser used. The laser set
temperature is between 25° C and 45° C. The actual laser temperature can be in the
± 5° C range around the set point.

Broadcast EDFA Power and Gain Setup

Broadcast EDFAs are optimized for single optical channel application to achieve best
performance for analog video signals. For single channel operation the operating
wavelength range is from 1530 nm to 1565 nm. Constant power operation mode is
usually desired for the application. Constant gain mode is available as an option.
Power and Gain Terminology
The following table explains common terminology used in this section.
Term
Constant Power
Mode
Constant Gain
Mode
Input power per
wavelength
Composite input
power
Output power per
wavelength
OL-29936-01
Abbreviation Definition
In constant power mode the total output power
from the amplifier is set via the LCM. Once set,
any change that occurs to the input signal within the
specification window results in no change to the
output power.
Note: In this mode, the composite gain, the gain
per wavelength, and the output power per
wavelength may not stay constant.
In constant gain mode the gain of the optical
amplifier is set via the LCM. Once the gain is set,
the amplifier automatically adjusts to any change to
the composite input power or to an individual
wavelength being dropped or added. This
adjustment results in a corresponding change to the
composite output power.
Note: In this mode, constant composite output
power is not maintained, but constant gain per
wavelength, constant composite gain, and constant
output power per wavelength are maintained.
P Amount of power present at a particular
IN/λ
wavelength at the input to the amplifier.
P Sum of the power present in all the individual
IN/C
wavelengths at the input to the amplifier.
P Amount of power present at a particular
OUT/λ
wavelength at the output to the amplifier.
Optical Amplifier (EDFA) Modules
59