Optical Wavelength Conversion Unit. STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function, страница 19

n  According to the specific networking condition, the optical transmission segment can reach 120 km long for 32-channel OptiX BWS 320G system and 145 km long for 16-channel OptiX BWS 320G system.

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 "OUT" optical port of M32 board or other optical multipexing boards, and are usually attenuated by an adjustable optical attenuator during transmission. The output port "OUT" of WBA is connected to "TI" port of SCA board.

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

n  The optical connector on WBA 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, the signals of "MON" port come from the same optical source as that of "OUT" port, 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 WBA board are shown in Table 3-16 and Table 3-17.

Table3-16 List of WBA(WPA, WLA)board alarms

Table 3-17 List of WBA(WPA, WLA)board performances

1. Principle

WPA board is usually installed at the receiving end of OptiX BWS 320G system and is generally called preamplifier. It is used to amplify the receiving sensitivity of the optical receiver and compensate the insertion loss of optical passive devices. The main requirement of DWDM system on the optical preamplifier is low noise index. According to the module functions, WPA 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.

Figure 3-15 Function block diagram of WPA/WLA board

2. Functions

n  Power gain of WPA for respective wavelength optical signals: gain of the power 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 WPA, 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.