Monolithically integrated heterodyne optical phase-lock loop with RF XOR phase detector
Monolithically integrated heterodyne optical phase-lock loop with RF XOR phase detector
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DOI：
10.1364/oe.19.020048
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发表时间：
2011-10-10
期刊：
影响因子：
3.8
通讯作者：
Seeds, Alwyn J.
中科院分区：
文献类型：
--
作者：
Steed, Robert J.;Pozzi, Francesca;Seeds, Alwyn J.
我们展示了外差光学锁相环 (OPLL) 的结果，该外差光学锁相环 (OPLL) 与外部鉴相器和环路滤波器单片集成在 InP 上，它将集成激光器锁相到外部源，偏移频率可在 0.6 GHz 至 6.1 GHz 之间调谐。集成半导体激光器的发射波长为 1553 nm，线宽为 1.1 MHz，而外部激光器的线宽小于 150 kHz。为了使用这些线宽的激光器实现高质量锁相，环路延迟已小于 1.8 ns。单片集成将激光器和光电二极管之间的光路延迟降低至 20 ps 以下。 OPLL 的电子部分是使用定制设计的反馈电路实现的，其传播延迟约为 1 ns，开环带宽大于 1 GHz。锁定的从激光器和主激光器之间的外差信号具有以下相位噪声。频率偏移大于 20 kHz 时为 90 dBc/Hz，10 GHz 带宽中的相位误差方差为 0.04 rad(2)。 (C) 2011 美国光学学会
We present results for an heterodyne optical phase-lock loop (OPLL), monolithically integrated on InP with external phase detector and loop filter, which phase locks the integrated laser to an external source, for offset frequencies tuneable between 0.6 GHz and 6.1 GHz. The integrated semiconductor laser emits at 1553 nm with 1.1 MHz linewidth, while the external laser has a linewidth less than 150 kHz. To achieve high quality phase locking with lasers of these linewidths, the loop delay has been made less than 1.8 ns. Monolithic integration reduces the optical path delay between the laser and photodiode to less than 20 ps. The electronic part of the OPLL was implemented using a custom-designed feedback circuit with a propagation delay of similar to 1 ns and an open-loop bandwidth greater than 1 GHz. The heterodyne signal between the locked slave laser and master laser has phase noise below. 90 dBc/Hz for frequency offsets greater than 20 kHz and a phase error variance in 10 GHz bandwidth of 0.04 rad(2). (C) 2011 Optical Society of America