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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。
The digital communication experiment system of Polarization Quadrature Phase Shift Keying (QPSK) transmission and coherent detection is established and the performance of the system is analyzed. Polarization-multiplexed QPSK signals of 40 Gbit / s are transmitted 100 km in a single mode optical fiber (SMF); the signal light is mixed with the local oscillator light at the receiving end and downconverted, and finally the received signal is off-line with a digital signal processing (DSP) algorithm deal with. The bit error rate (BER) of different optical signal-to-noise ratio (OSNR) before and after optical fiber transmission is compared. The experimental results show that the DSP algorithm used can overcome the main damage to the signal by fiber channel and effectively detect high-speed coherent signals Recovery.