Chromatic Dispersion Compensation in a SingleChannel, Single-Span 10 Gbit/s Fiber Optic Transmission System with Direct Photodetection Using Digital Signal Processing

The influence of chromatic dispersion on the noise immunity of an optical signal transmitted in a single-channel fiber-optic transmission system with direct photodetection is investigated. The criterion for assessing the noise immunity of a detected signal is the Q-factor. A method for compensating chromatic dispersion using digital signal processing is proposed. Digital signal processing is performed using a digital correction device installed in the receiving part of the transmission system, after the photodetector. The impulse response depends on the parameters of the transmission system. The theoretical effectiveness of the proposed chromatic dispersion compensation method is evaluated. The effectiveness of the compensation method is assessed by comparing the noise immunity of the detected signal before and after applying the dispersion compensation method. The possibility of using the proposed method of chromatic dispersion compensation in modern fiber-optic transmission systems is considered. The research was carried out using analytical modeling of the process of transmitting a sequence of Gaussian pulse signals over a standard single-mode optical fiber. The analytical model is implemented in the Mathcad environment