Inquiry About How The Regeneration Function Works in an OTU Board and What Functions it Performs?

Hi there！
The function of the REG station is to relay and amplify the received signals. The cross-connect board and tributary board are not required because it does not need to add or separate services to the local device.

There are two types of relay stations: optical relay and electrical relay. If the OSNR value of line signals is low, the electrical regeneration mode is not suitable. The line board is the core of the electrical regeneration site, and the CFP optical module is the core of the line board.

For the process of signal regeneration, see the following figure of NS4 board:

The NS4 board implements the regeneration of one channel of optical signals. The wavelengths at the receive and transmit ends of the board are the ITU-T G.694.1-compliant DWDM wavelengths that carry OTU4 optical signals.

The optical receiving module receives the optical signals to be regenerated through the IN optical interface, and performs O/E conversion.

The signal processing module performs decoding, overhead processing and encoding of signals. During the process, the reshaping, regenerating and retiming based on electrical signals are performed, and the signals are encapsulated into OTN frames.

After encoding, the signals are sent to the optical transmitting module. After performing E/O conversion, the module sends out the OTU4 signals at DWDM standard wavelengths that comply with ITU-T G.694.1.

The optical signals are output through the OUT optical interface.

Thank you！