Research On Reshaping Of Optical Pulse Based On The Fiber Bragg Grating

Optical communication technology, which is under the background of rapid development, has entered the era of high-speed optical communication. At the same time, current network meets the following situation:high bandwidth, high-speed transmission, a variety of signal encoding methods and services in a wide range of content. Therefore, it requires smaller channel occupancy rate for transmit data, and requires optical communication system to be more efficient, more quick and more sophisticated in information processing capability. However, continuously increasing complexity of optical network environment and extended transmission distance, all of the above make multiple impacts on quality of light pulse. Dispersion of transmission, switching of packets and frames, loss of optical nodes, all of which will produce a variety of signal degradation, such as splitting, broadening and interaction. As a consequence, demodulation error rate is raised and signal quality of optical network transmission is reduced.According to the specific problems of high power optical soliton pulse degradation in fiber transmission, this thesis studies the soliton pulse shaping method using fiber gratings. From the theoretical equations of optical soliton pulse transmission, using Fourier transform method and transfer matrix method to solve the nonlinear coupled-mode equations(NLCMEs) and analyse the characteristics of soliton pulse in fiber Bragg grating. Simulate and analyse the output effect of optical soliton pulse, which is reflected by fiber grating, and the reflection spectrum and time delay spectrum of fiber grating.In the all-optical communication system, it is required to improve the storing optical signal performance, therefore, the pulse compression and noise reduction technology will be bring in to improve the performance of optical buffer. Using the OptiSystem simulation software, the CFG soliton pulse reshaping and optical buffer system is builded. Through the simulation of optical circular buffer system, Q factor is obtained by eye diagram after reshaping of apodized and chirped fiber grating, which has a reflection bandgap center frequency of 193.4THz. Optimization of output optical soliton signal of dual-channel buffer is achieved by apodized and chirped fiber grating.