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光差分四相移键控(DQPSK)信号解调技术是相位调制光纤通信系统中的关键技术,本文利用钒酸钇(YVO4)晶体设计制作了2 bit延迟干涉仪(DI)作为DQPSK解调器。相对于传统的基于光纤结构的DI,用晶体材料制作的DI具有温度稳定性高的特点,其作为光DQPSK解调技术中的关键器件,具有广泛的应用前景。实验搭建了20 Gb/s光NRZ-DQPSK背靠背实验系统,并利用自主设计制作的DI成功实现了NRZ-DQPSK信号解调。实验结果与计算机仿真计算结果一致。
Optical differential quadrature phase shift keying (DQPSK) signal demodulation technology is a key technology in phase modulation optical fiber communication system. In this paper, a 2 bit delay interferometer (DI) is designed and manufactured as a DQPSK demodulator by using yttrium vanadate (YVO4) . Compared with the traditional DI based on optical fiber structure, DI made of crystal material has the characteristics of high temperature stability. As a key device in optical DQPSK demodulation technology, DI has wide application prospect. Experimental setup of 20 Gb / s optical NRZ-DQPSK back-to-back experimental system, and the use of self-designed DI successfully achieved NRZ-DQPSK signal demodulation. The experimental results are consistent with the computer simulation results.