Optical Wavelength Conversion Unit. STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function, страница 16

n  Having the expandable middle state interface, if necessary, MR2 can connect another add/drop unit to realize the add/drop channel expanding.

n  Perform remote on-line loading of board software.

3. Applications

n  "IN" and "OUT" optical interfaces on MR2 handle bar are connected to the input and output main channel respectively, usually the output of WPA and input of WBA. "ADD01/02" and "DROP01/02" are respectively connected to the optical wavelength conversion boards of two wavelength channels added/dropped locally. “Mid-in” and “Mid-out” can connected through a attenuator or connect “out” or “in” interface of another add/drop to realize more wavelength adding/dropping.

n  MR2 can be inserted in 1~13 board positions of OptiX BWS 320G subrack.

n  The optical connector on MR2 board handle bar is of SC type.

4. Alarms and performances

Alarms of MR2 board are listed in Table 3-12.

Table 3-12 List of MR2 board alarms

Performances reported by MR2 board include: input and output optical power.

1. Principle

M16 board refers to the 16-channel multiplexing Unit. According to the module functions, it mainly consists of the optical module and electrical module. The optical module consists of one 16-channel optical multiplexer and two 10: 90 couplers; it accomplishes the multiplexing of the 16 wavelength channels and provides on-line optical monitoring interfaces. The optical multiplexer used on M16 board is of multi-layer dielectric film filter type or coupler type. These two are optical passive devices and there is no need for temperature control. The electrical module is mainly composed of optical power detecting circuit and mailbox communication circuit. So the electrical module performs the functions of optical power monitoring, alarm and communicating with the main control board. The principle block diagram of M16 board is shown in Figure 3-12.

Figure 3-12 Principle block diagram of M16 board

In Table 3-9, serial No. 01 to 16 show the wavelengths and frequencies corresponding to the 16 channels of M16 board.

2. Functions

n  Multiplex the 16 wavelength channels into the main channel.

n  Provide on-line monitoring interface: a spectrum analyzer or multi-channel processing board MS2 of OptiX BWS 320G system can be accessed through this optical interface and monitor the spectrum of the main channel without interrupting the services.

n  Detect the output optical power, communicate with the main control board and NM system through the mailbox, report board alarms and performance events, receive the setting commands sent from NM and display the alarms by indicators.

n  Perform remote on-line loading of board software.

3. Application

n  At the transmitting end of the open-type equipment, M16 multiplexes the 16 optical signals from optical wavelength conversion boards at transmitting end into one optical fiber for transmission; while at the transmitting end of the integrated equipment, M16 multiplexes the optical signals from 16 SDH equipment into one optical fiber for transmission. The output signals are usually sent to WBA input optical interface for optical power amplification of the main channel.