OPTICAL FREQUENCY CONTROLLING INSTRUMENT FOR ULTRA-DENSE WAVELENGTH-DIVISION-MULTIPLEXED LIGHT CHANNELS

摘要

The present invention provides an ultra-high density (ultra-dense), and two-way (bidirectional) wavelength division multiplexing optical communication system (wavelength an optical frequency controlling device to align the center frequency of the optical channel used for -division multiplexing system). The present invention utilizes the bit frequency (beat frequency) between the optical channel signal generated by the photodetector. Each of the present invention to find out easily the contribution to the fiber channel bit frequency signal is a very high frequency spectrum analyzer (RF spectrum analyzer), and using a variable optical filter (tunable optical filter) and a wavelength tunable laser. Through this, the conventional wavelength used for the purpose of controlling the Fibre Channel position and regular (wavelength-locker) and Fabry-Perot filter (Fabry-Perot filter) ultra-dense and difficult to control only by sophisticated bi-directional wavelength division multiplexing optical elements such as can be controlled more precisely position the center frequency of the optical channel used in optical communication systems.