Optical Wavelength Conversion Unit. STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function, страница 20

n  Flat gain in the working wavelength range, flatness <2dB.

n  Gain lock function is available. When one or several channels are added or removed, the normal operation of other channels will not be affected; at the same time transient control function is also available, so in OptiX BWS 320G system when channels are added or removed, burst of error codes on the existing channels can be basically avoided.

n  Ability to obtain control information from SCC board and report this board status to SCC board, also with alarm display function by indicators.

3. Application

n  Input optical signals "IN" of WBA come from "RO" optical port of SCA board and are usually attenuated by an adjustable optical attenuator during transmission. The output port "OUT" of WPA is connected to "IN" port of D32 board or other optical demultiplexing board.

n  WPA can be inserted in 2~13 board positions of OptiX BWS 320G subrack.

n  The optical connector on WPA board handle bar is of SC type.

n  The spectrum of the main channel can be monitored through the "MON" optical interface on WBA handle bar, and the signals of "MON" port and "OUT" port come from the same optical source, but the optical power of "MON" port is only 1/99 of the optical power of "OUT" port under normal conditions.

4. Alarms and performances

Alarms and performances of WPA board are shown in Table 3-16 and Table 3-17.

1. Principle

WLA board is usually installed at the optical regeneration station of OptiX BWS 320G system and is generally called line amplifier. It is used to compensate the optical signal power attenuation caused by the optical cables on the line and extend the transmission distance. The main requirement of DWDM system on the optical line amplifier is high gain. According to the module functions, WLA board of OptiX BWS 320G system performs the functions of input optical power detection, output optical power detection, and automatic gain control. Its functional module division is shown in Figure 3-15.

2. Functions

n  Power gain of WLA for respective wavelength optical signals: gain of the line amplifier currently adopted in OptiX BWS 320G system is shown in Table 3-15.

n  Input optical power range: for the input optical power range of WLA, please refer to Table 3-15.

n  Optical signals of the 32 channels can be amplified simultaneously (channel spacing being 0.8 nm) with the working wavelength range of 1535~1561nm.

n  Flat gain in the working wavelength range, flatness <2dB.

n  Gain lock function is available. When one or several channels are added or removed, the normal operation of other channels will not be affected; at the same time transient control function is also available, so in OptiX BWS 320G system when channels are added or removed, burst of error codes on the existing channels can be basically avoided.

n  Ability to obtain control information from SCC board and report this board status to SCC board, also with alarm display function by indicators.

3. Application

n  Input optical signals "IN" of WLA come from "RO" optical port of SCA board and are usually attenuated by an variable optical attenuator during transmission. The output port "OUT" of WLA is connected to "TI" port of SCA.

n  WLA can be inserted in 2~13 board positions of OptiX BWS 320G subrack.

n  The optical connector on WLA board handle bar is of SC type.

n  The spectrum of the main channel can be monitored through the "MON" optical interface on WLA handle bar, and the signals of "MON" port and "OUT" port come from the same optical source, but the optical power of "MON" port is only 1/99 of the optical power of "OUT" port under normal conditions.