Monolithically Integrated Optical Phase Lock Loop for Microwave Photonics
Monolithically Integrated Optical Phase Lock Loop for Microwave Photonics
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DOI：
10.1109/jlt.2014.2317941
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发表时间：
2014-10-15
影响因子：
4.7
通讯作者：
Renaud, Cyril C.
中科院分区：
文献类型：
--
作者：
Balakier, Katarzyna;Fice, Martyn J.;Renaud, Cyril C.
我们提出了一个审查的关键设计方面的单片集成光学锁相环（OPLL）。讨论了OPLL的设计过程和参数。介绍了一种评估闭环操作系统增益的技术，并首次进行了实验验证。双OPLL系统在与光频梳发生器同步时，无需对梳状线进行任何预先滤波，就可以在从几GHz到THz范围的任何期望频率下生成高光谱纯度信号。外差锁相实现在2和6 GHz之间的连续可调的偏移频率。由于光子集成、小尺寸和定制电子器件，环路中的传播延迟小于1.8 ns，因此基于线宽小于几MHz的激光器的OPLL具有良好的相位噪声性能。该系统展示了光子集成应用于各种微波光子学应用的潜力，其中需要具有放大功能的窄带宽可调谐光学滤波器。
We present a review of the critical design aspects of monolithically integrated optical phase lock loops (OPLLs). OPLL design procedures and OPLL parameters are discussed. A technique to evaluate the gain of the closed loop operating system is introduced and experimentally validated for the first time. A dual-OPLL system, when synchronised to an optical frequency comb generator without any prior filtering of the comb lines, allows generation of high spectral purity signals at any desired frequency from several GHz up to THz range. Heterodyne phase locking was achieved at a continuously tuneable offset frequency between 2 and 6 GHz. Thanks to the photonic integration, small dimensions, and custom-made electronics, the propagation delay in the loop was less than 1.8 ns, allowing good phase noise performance with OPLLs based on lasers with linewidths less than a few MHz. The system demonstrates the potential for photonic integration to be applied in various microwave photonics applications where narrow-bandwidth tuneable optical filters with amplification functionality are required.