Opt Lett. 2018 Dec 1;43(23):5769-5772. doi: 10.1364/OL.43.005769.
We demonstrate optical injection locking (OIL) at record low injection power of -65 dBm using EDFA-based pre-amplification and an electrical phase locked loop (PLL). Investigating the phase noise characteristics of OIL, we find that at low injection powers the slave laser linewidth and injection ratio strongly influence the phase noise of the locked slave output. By introducing an EDFA pre-amplifier, the minimum locking power for OIL is reduced. Moreover, using this pre-amplifier we find that there exists an optimum injection power into the slave where the output phase noise is minimized and is below the phase noise without EDFA. We evaluate an OIL-based pump recovery in a phase sensitive amplifier (PSA) receiver system aimed at free-space communications.
我们使用基于 EDFA 的预放大器和电相锁环 (PLL)，在创纪录的低注入功率-65dBm 下演示了光注入锁定 (OIL)。通过研究 OIL 的相位噪声特性，我们发现，在低注入功率下，从激光器线宽和注入比强烈影响锁定从激光器输出的相位噪声。通过引入 EDFA 预放大器，降低了 OIL 的最小锁定功率。此外，使用此预放大器，我们发现存在一个最佳的注入功率，在此功率下，从激光器输出的相位噪声最小，并且低于没有 EDFA 的相位噪声。我们评估了基于 OIL 的泵浦恢复在相敏放大器 (PSA) 接收系统中的应用，旨在实现自由空间通信。
