Kasai Keisuke, Kan Takashi, Yoshida Masato, Hirooka Toshihiko, Nakazawa Masataka
Opt Express. 2022 Apr 11;30(8):13345-13355. doi: 10.1364/OE.456327.
We describe the broadband injection-locking performance of a Fabry-Perot laser diode (FP-LD) for digital coherent transmission. The dynamic locking bandwidth of the FP-LD was as wide as 28.8 GHz, which makes it possible to achieve precise carrier-phase synchronization with extremely low phase noise over a wide frequency range. By applying the FP-LD as an LO in an injection-locked homodyne receiver for digital coherent quadrature amplitude modulation (QAM) transmission, we demonstrate, for the first time, the precise demodulation of 3, 10 and 20 Gbaud 256 QAM signals even when using a widely and randomly phase-modulated transmitter laser. This is attributed to the excellent wideband dynamic injection-locking characteristics of the FP-LD.
我们描述了用于数字相干传输的法布里-珀罗激光二极管（FP-LD）的宽带注入锁定性能。该FP-LD的动态锁定带宽高达28.8 GHz，这使得在很宽的频率范围内能够以极低的相位噪声实现精确的载波相位同步。通过将FP-LD用作注入锁定零差接收机中的本地振荡器（LO），用于数字相干正交幅度调制（QAM）传输，我们首次证明，即使使用广泛且随机相位调制的发射激光器，也能精确解调3、10和20 Gbaud的256 QAM信号。这归因于FP-LD出色的宽带动态注入锁定特性。
