IMDD-OFDM optical fiber system and diversity reception dispersion compensation method thereof

Abstract

The invention discloses an IMDD-OFDM optical fiber system and a diversity reception dispersion compensation method thereof, the IMDD-OFDM optical fiber system comprises a transmitter and a receiver, and the receiver comprises an optical beam splitter, a dispersion element, a first photoelectric detector, a second photoelectric detector and a receiving end digital signal processing module. An OFDM optical signal output by a transmitter is divided into a first path of OFDM optical signal and a second path of OFDM optical signal, the first path of OFDM optical signal is output after being detected by a first photoelectric detector, and the second path of OFDM optical signal is output after being detected by a second photoelectric detector after passing through a dispersion element. And an output signal of frequency selective power fading caused by compensated dispersion of each subcarrier is obtained through a receiving end digital signal processing module. According to the invention, the problem of frequency selective power fading can be effectively compensated, so that the signal-to-noise ratio of the output signal reaches the maximum, and the receiver is simple in structure and low in system cost. 本发明公开了一种IMDD－OFDM光纤系统及其分集接收色散补偿方法，IMDD－OFDM光纤系统包括发射机与接收机，所述接收机包括：光分束器、色散元件、第一光电探测器、第二光电探测器与接收端数字信号处理模块。通过将发射机输出的OFDM光信号分为第一路OFDM光信号与第二路OFDM光信号，第一路OFDM光信号经第一光电探测器探测后输出，第二路OFDM光信号经色散元件后由第二光电探测器探测并输出，再通过接收端数字信号处理模块得到各个子载波的已补偿色散引起的频率选择性功率衰落的输出信号。本发明能够有效补偿频率选择性功率衰落问题，使得输出信号的信噪比达到最大，且接收机的结构简单，系统成本较低。