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研制了一种基于光纤马赫-曾德尔干涉仪(MZI)的可调差分相移键控(DPSK)解调器,其具有插入损耗低、隔离度高、稳定性强和相位连续可调的优点。从理论上对差分相移键控信号解调的工作原理进行了详细分析。温度控制系统对光纤臂进行温度控制,温控范围为20℃,精度可达0.1℃。实验中实现了40Gb/s差分相移键控信号的解调,解调信号消光比为14.5dB,温度控制实现了输出结果的长时间稳定,并可在相长干涉和相消干涉之间转换。
A tunable differential phase shift keying (DPSK) demodulator based on optical fiber Mach-Zehnder interferometer (MZI) is developed, which has the advantages of low insertion loss, high isolation, strong stability and continuously adjustable phase . Theoretical analysis of differential phase shift keying signal demodulation works in detail. Temperature control system Temperature control of the fiber arm, the temperature range of 20 ℃, the accuracy of up to 0.1 ℃. In the experiment, the demodulation of 40Gb / s differential phase shift keying signal is realized. The extinction ratio of the demodulated signal is 14.5dB. The temperature control realizes long time stability of the output result and can convert between constructive interference and destructive interference .