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基于双平行马赫曾德调制器的动态可调光载波边带比光单边带调制：理论分析与实验研究
Optical single sideband modulation with continuously tunable optical carrier-to-sideband ratio by employing a dual-parallel Mach-Zehnder modulator
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摘要: 理论分析并实验研究了一种基于双平行马赫曾德调制器(DP-MZM)具有动态光载波边带比(OCSR)调谐能力的光单边带(OSSB)调制实现方案，方案利用DP-MZM内部集成的三个独立的调制单元，分别实现OSSB调制、光载波移相和光信号干涉，最终，仅需改变调制器的一个偏置点，就实现了OCSR的动态调谐，实验得到了小信号调制(调制系数m=0.2)下， OCSR的可调范围?20.8-23.5 dB.并分析了OCSR与射频功率之间的对应关系，通过本方案调谐至最佳的OCSR可提高模拟光链路接收灵敏度.Abstract: We propose and demonstrate an optical single sideband (OSSB) modulation approach with continuously tunable optical carrier-to-sideband ratio (OCSR) theoretically and experimentally. In the proposal, one dual-parallel Mach-Zehnder modulator (DP-MZM) acts as a key component. By properly setting the modulator, three separate sub-modulators inside the DP-MZM can be used to realize the OSSB modulation, optical carrier phase-shift, and lightwave interference. By adjusting the bias voltage of one sub-modulator, the OCSR can be tuned continuously. In the experiment, the tuning range of OCSR is found to be between?20.8 dB and 23.5 dB at modulation index m=0.2. We also analyze the relationship between the OCSR and RF power after detection. It is found that with properly adjusting the OCSR, the receiver sensitivity can be greatly improved.
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