Composition of optical wavelength division multiplexing system:
1) optical multiplexer (MUX) : multiplexing multiple wavelengths into a single optical fiber for transmission.
2) optical power amplifier (BA) : it can compensate the loss of optical multiplexer and improve the fiber input power.
3) optical line amplifier (LA) : to compensate the loss of optical fiber.
4) optical preamplifier (PA) : improve the receiving level and receiver sensitivity.
5) optical dispersion compensator (DCM) : provides dispersion compensation for long-distance transmission.
6) DEMUX: use multiple wavelengths in each fiber to separate channels.
7) optical interface converter (OTU) : convert the conventional SDH optical signal into the signal suitable for DWDM transmission.
8) monitoring channel (OSC) : channel dedicated to transmitting monitoring system.
