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针对光纤无线通信(ROF)系统对光强调制器线性度的特殊要求,设计了一种新型的集成光学器件——微环相位辅助型马赫-曾德尔调制器(RPAMZM)。将一个微环谐振器和一个相位调制器分别加载到马赫-曾德尔调制器的两臂,可以补偿普通马赫-曾德尔调制器的亚线性,得到线性度良好的响应特性。建立了该种器件的理论分析模型,计算了不同条件下的传输特性和无毛刺动态范围(SFDR)。分析结果表明,在不计损耗的情况下,器件的非线性主要来源于传输函数泰勒展式的三次项,通过控制透射系数,可以使该项等于零,无毛刺动态范围获得19.68 dB的提高;在损耗存在的情况下,通过控制透射系数和偏压因子,可以同时抑制掉二次和三次这两个主要的非线性项,无毛刺动态范围获得15.74 dB的相对改善。
Aiming at the special requirements of the optical fiber wireless communication (ROF) system for the linearity of light modulator, a new type of integrated optical device, the micro-ring phase-assist Mach-Zehnder modulator (RPAMZM), is designed. By loading a microring resonator and a phase modulator into the two arms of a Mach-Zehnder modulator, respectively, the sub-linearity of a normal Mach-Zehnder modulator can be compensated for good linearity response. The theoretical analysis model of this kind of device is established and the transmission characteristics and the finless dynamic range (SFDR) under different conditions are calculated. The results show that the nonlinearity of the device is mainly derived from the cubic term of the Taylor expansion of the transfer function without considering the loss. By controlling the transmission coefficient, this gain can be increased to 19.68 dB with no glitch dynamic range. By controlling the transmission coefficient and the bias factor, the two main nonlinearities of the second order and the third order can both be suppressed, and the relative improvement of 15.74 dB can be obtained in the deburring free dynamic range.