电力光纤通道的PS-QPSK调制

高频谱偏振相干光高效率的优势在电力光纤传输中得到了广泛应用,然而,这种传输机制对外界干扰极其敏感。为减少光纤传输损伤,提高信道信噪比,高效的调制格式是改善传输信道性能和延长传输距离的有效途径。通过对传统QPSK星座图的旋转,提出了偏振切换正交相移键控(PS-QPSK),在接收侧采用相干检测技术可以实现高性能的信号解调。对于电力主干光纤传输系统,采用PS-QPSK的调制方式,在光信噪比和传输距离方面都有所改善。在误码率为3.8×10-3的信道中信噪比提升近1d B,50GHz的主干光纤中最大覆盖范围较传统方法增加了30%。

PS - QPSK modulation at power optical fiber channel

Polarized coherent light with high spectral efficiency advantage has been widely used in power optical fiber transmission. However, this transmission method has its sensitivity to outside interference. To reduce damage to the optical fiber transmission, and improve the SNR of channel, the efficiency modulation format is a effective way, improving the transmission of the channel properties and extending the transmission distance. By rotating the conventional QPSK constellation proposed polarization switching quadrature phase shift keying (PS-QPSK), at the receiving side with coherent detection technique can achieve high performance signal demodulation. For the fiber optic backbone transmission system using PS-QPSK, optical signal to noise ratio (OSNR) and transmission distance are improved. In the bit error rate of 3.8×10-3 channel SNR improvement of nearly 1dB, 50 GHz frequency fiber optic backbone maximum coverage increased by 30% compared to traditional methods.