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1引言差分相移键控调制格式,由于其相对于传统强度调制格式,在达到相同误码率时,对光信噪比的要求降低了(使用平衡探测),且具有更好的抗非线性效应的能力。因此这种格式已经成为高速光网络所采用的主要调制格式之一。在采用调制格式的光网络系统中,相位信息无法被直接检测,故需要一个解调器将调制格式转换为强度调制格式,以便于接收。
1 Introduction Differential phase shift keying modulation format, due to its relative to the traditional intensity modulation format, to achieve the same bit error rate, the optical signal-to-noise ratio requirements (using balanced detection), and has better anti-nonlinear Effect of the ability. Therefore, this format has become one of the major modulation formats adopted by high-speed optical networks. In the optical network system adopting the modulation format, the phase information can not be directly detected, so a demodulator is required to convert the modulation format into an intensity modulation format for easy reception.