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DPSK modulation and demodulation system based on a novel Mach-Zehnder interference structure

机译：DPSK modulation and demodulation system based on a novel Mach-Zehnder interference structure

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摘要

As the conventional fiber Mach-Zehnder (M-Z) interference structure being sensitive to temperature variation and mismatching of arm length in Differential Phase Shift Keying (DPSK) system, we proposed a modulation and demodulation system of DPSK based on novel M-Z interference structure. This novel M-Z interference structure has some advantages of higher temperature stability, better robustness and lower restriction of laser linewidth. A detailed discussion of the working principle is presented and demonstrated, the influences of the delay induced by arm mismatching and temperature variation on the Q factor of DPSK system are analyzed. Experimental results as well as simulations show that the delay length mismatching corresponding to descent point of 3dB increases from [0.925,1.124] to [0.536,1.31], which reduces the requirement for the length accuracy of the interference arm, and the demodulation effect of the novel structure is better under the same deviation. The Q factor of the system keeps fluctuation within a narrow range when the temperature variation in the range of 20 degrees C-120 degrees C, and the demodulation effect of the system is almost unaffected by the variation of ambient temperature.

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