CAJ | 학술논문

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1dB，50GHz的主干光纤中最大覆盖范围较传统方法增加了30％。
고빈보편진상간광고효솔적우세재전력광섬전수중득도료엄범응용，연이，저충전수궤제대외계간우겁기민감。위감소광섬전수손상，제고신도신조비，고효적조제격식시개선전수신도성능화연장전수거리적유효도경。통과대전통QPSK성좌도적선전，제출료편진절환정교상이건공（ PS-QPSK ），재접수측채용상간검측기술가이실현고성능적신호해조。대우전력주간광섬전수계통，채용PS-QPSK적조제방식，재광신조비화전수거리방면도유소개선。재오마솔위3.8×10-3적신도중신조비제승근1dB，50GHz적주간광섬중최대복개범위교전통방법증가료30％。
The advantages of the polarized coherent light with high spectral efficiency have been widely used in power optical fiber transmission.However, this transmission mechanism is very sensitive to outside interference.To reduce the damage to the optical fiber transmission and improve the optical signal to noise ratio ( OSNR) of the channel, the efficient modulation format is an effective way of improving the transmission channel properties and extending the transmission distance.By rotating the conventional QPSK constellation, this paper proposed polarization switching quadrature phase shift keying ( PS-QPSK) .The adoption of the coherent detection technique at the receiving side could achieve signal demodulation with high performance.PS-QPSK modulation was used in the backbone optical fi-ber transmission system, which improved the OSNR and transmission distance.In the channel with the error rate of 3.8 ×10 -3 , the OSNR was increased by nearly 1dB, and the maximum coverage range in the backbone optical fiber system with 50 GHz was increased by 30 percent, compared with that in traditional methods.