Low chirp electro-optic intensity modulation using planar microwave 180-degree hybrid directly prepared on LiNbO3 substrate

A. Enokihara, Masashi Yamamoto, T. Kawai, T. Kawanishi
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引用次数: 1

Abstract

An electro-optic (EO) modulator integrated with the microwave planar circuit directly prepared onto a LiNbO3 substrate for low chirp performance and compact configuration is introduced. A microwave rat-race (RR) circuit, which operates as the 180-degree hybrid, is designed on a z-cut LiNbO3 substrate to create two modulation signals of the same amplitude in antiphase with each other from a single-input signal. Output ports of the RR were connected to the modulation electrodes on the substrate. The two signals drive two phase modulation parts of dual-electrode Mach-Zehnder modulator so that the symmetric interference are realized to obtain low-chirp intensity modulated light signals. The modulator was designed and fabricated for around 10 GHz modulation frequencies and 1550 nm light wavelength. The chirp parameters were measured to be less than 0.2 in the frequency range between 8 and 12 GHz. By compensating the unbalance of the light power splitting the chirp could be significantly reduced.
直接在LiNbO3衬底上制备平面微波180度杂化的低啁啾电光强调制
介绍了一种直接在LiNbO3衬底上集成微波平面电路的电光调制器,具有低啁啾性能和结构紧凑的特点。在z-cut LiNbO3衬底上设计了一种180度混合工作的微波大鼠竞赛(RR)电路,从一个单输入信号中产生两个振幅相同的反相调制信号。RR的输出端口连接到基板上的调制电极上。这两个信号驱动双电极马赫-曾德尔调制器的两个相位调制部分,从而实现对称干涉,获得低啁啾强度的调制光信号。该调制器的调制频率为10ghz左右,波长为1550nm。在8 ~ 12 GHz的频率范围内,测量到的啁啾参数小于0.2。通过补偿光功率分裂的不平衡,可以显著降低啁啾。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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