Slot Wdm Network Optical Transceiver Configuration Study

WDM (wavelength division multiplexing) is such a technique that can transmit laser signals on different wavelengths in a single fiber. Modulated data(text, voice, video etc) can transmits in its own wavelength.At present, the optical transmitter and receiver are fixed which means it can only works on one wavelength. Generally, there is more than one wavelength in a WDM system. So a node in the WDM system has to install enough fixed transmitters and receivers to use those wavelengths. The cost of building the system increases as the increasing of the numbers of wavelength. On the other way, tunable transmitter can work on different wavelengths, but it is too expensive to use.If an entire wavelength is assigned to a given connection, it can lead to lower channel utilization when the connection doesn't need all the bandwidth. It can be solved by dividing the wavelength into fixed length time slots. When a connection comes, the system provides it enough slots, the exact the numbers according to the connection's bandwidth requirements. And the rest time slots can be assigned to different connection.This paper mainly studies the configuration of optical transmitters and receives of WDM network. Although using a few fixed transmitters and receivers, this configuration can achieve high channel utilization through properly assigning wavelengths and slots.