Study On The Application Of Fiber Gratings In The PMD Compensation System

With the development of the optical fiber communication system, especially in the optical fiber communication system with a speed above 10 Gb/s, the problem of polarization mode dispersion in the fiber link, which is one of the hotspots in the field of optical fiber communication system worldwide, has been very urgent and become the decisive factor for the limitation of transmission distance. The fundamental theory of polarization mode dispersion and its influence on the system have been deeply analyzed in the paper, and the theory as well as realization method of polarization mode dispersion compensation have been discussed. Linearly chirped fiber Bragg grating has been used as the delay compensation set in which piezoelectric transducer has been used to achieve the dynamic compensation of polarization mode dispersion in the fiber link. And then, based on the equivalence between the chirp in the sampling period and the chirp in the grating period, a sampled fiber Bragg grating with uniform grating period has been fabricated for the compensation of different polarization mode dispersions of different channels in the wavelength division multiplexing system. The time delay of fiber gratings and the differential group delay have been obtained using the interference method. Through the analysis of system power penalty using System View software, the result can be obtained that using the compensation system mentioned above, the quality of the output signal can be improved greatly.