An Optical Phase-Locked Loop Photonic Integrated Circuit
An Optical Phase-Locked Loop Photonic Integrated Circuit
复制标题
DOI：
10.1109/jlt.2009.2030341
复制
发表时间：
2010-02-15
影响因子：
4.7
通讯作者：
Johansson, Leif A.
中科院分区：
文献类型：
--
作者：
Ristic, Sasa;Bhardwaj, Ashish;Johansson, Leif A.
我们提出的设计，制造，和结果从第一单片集成光锁相环（OPLL）光子集成电路（PIC）适合各种零差和偏移锁相应用。这种基于InP的PIC包含两个采样光栅分布式反射器（SG-DBR）激光器，半导体光放大器（SOA），相位调制器，平衡光电探测器，多模干涉（MMI）耦合器和分路器。SG-DBR激光器具有超过5 THz的频率调谐范围，可以在宽频谱内产生相干拍频。此外，SG-DBR激光器具有大的调谐灵敏度，并且在频率调制带宽上不表现出任何相位反转，使其非常适合用作反馈回路中的电流控制振荡器。这些SG-DBR激光器具有宽线宽，并且需要高反馈环路带宽以便用于OPLL。使用光子集成使这成为可能，光子集成提供低成本、易于封装具有低反馈延迟的紧凑环路。在本文中，我们提出了两个实验来证明OPLL-PIC的概念验证操作：零差锁定和偏移锁定的SG-DBR激光器。
We present the design, fabrication, and results from the first monolithically integrated optical phase-locked loop (OPLL) photonic integrated circuit (PIC) suitable for a variety of homodyne and offset phase locking applications. This InP-based PIC contains two sampled-grating distributed reflector (SG-DBR) lasers, semiconductor optical amplifiers (SOAs), phase modulators, balanced photodetectors, and multimode interference (MMI)-couplers and splitters. The SG-DBR lasers have more than 5 THz of frequency tuning range and can generate a coherent beat for a wide spectrum of frequencies. In addition, the SG-DBR lasers have large tuning sensitivities and do not exhibit any phase inversion over the frequency modulation bandwidths making them ideal for use as current controlled oscillators in feedback loops. These SG-DBR lasers have wide linewidths and require high feedback loop bandwidths in order to be used in OPLLs. This is made possible using photonic integration which provides low cost, easy to package compact loops with low feedback latencies. In this paper, we present two experiments to demonstrate proof-of-concept operation of the OPLL-PIC: homodyne locking and offset locking of the SG-DBR lasers.