A Tunable Optical Encoder/Decoder using PN code and Chirped Fiber Bragg Grating and Tunale Optical CDMA Transmitter/Receiver with the Encoder/Decoder

摘要

The present invention arrange the reflection wavelength of the chirped (chirped) the optical fiber diffraction grating as a PN code for one of the variable optical CDMA transceiver using the controller applying variable optical encoder / decoder, and this can be adjusted for different channel. Encoder of the present invention includes a variable optical encoder according to the present invention, at least two PN codes is repeated to form a grid so as to correspond to the listed overlapping PN code, the lattice has a portion corresponding to the "0" of the redundant PN code in the not formed to form a grid part, corresponding to the "1" of the redundancy PN code portion of the grid is formed in the portion that reflects the wavelength of the optical signal was not formed with the grid to transmit the wavelength of the optical signal to the redundant the optical fiber grating chirping of the optical signal to one that encodes a PN code; The wavelengths that are reflected or transmitted from the chirped optical fiber grating by shifting by one bit in a particular direction characteristic for controlling the characteristics of the optical fiber grating to output by the PN code control means; And a wavelength selection means for selecting a wavelength region of the reflected or transmitted wave of the region to be encoded according to the one of the PN code, an optical signal in the optical fiber grating. In accordance with the present invention to reduce the cost, service cost of the optical communication system can improve the communication traffic efficiency.