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中文摘要：
建立了偏振复用正交相移键控（QPSK）传输及相干检测的数字通信实验系统,并分析系统的性能。40Gbit/s的偏振复用QPSK信号在单模光纤（SMF）中传输了100km;信号光与本振光在接收端进行混频并下变频,最后用数字信号处理（DSP）算法对接收信号离线处理。比较了光纤传输前后不同的光信噪比（OSNR）下的误码率（BER）,实验结果表明,所使用的DSP算法能克服光纤信道对信号的主要损伤,对高速的相干检测信号进行有效的恢复。
英文摘要：
An experimental digital communication system of polarization division multiplexed quadrature phase shift keying（QPSK） signal transmission and coherent detection is successfully built.In the experiment,the 40 Gbit/s polarization division multiplexed QPSK signal is transmitted over 100 km in single-mode fiber.At the receiver,the optical signal is mixed with a local oscillator and down-converted,then processed by digital signal processing（DSP） algorithm off-line.Comparing the bit error rates and constellations of the received signal under different optical signal-to-noise ratio（OSNR） values before and after transmission over fiber,the experimental results show that detected the DSP algorithm can overcome the major channel damage to the signal,and effectively recover the high-speed coherent signal.
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