Abstract
A simple and effective approach to semiconductor laser linewidth narrowing via mutual injection locking is proposed and demonstrated in both short and long delay regimes. A theoretical analysis is presented to investigate the linewidth behavior of semiconductor lasers under mutual injection locking. Experimental demonstrations in short and long delay regimes are implemented by integrated devices and a fiber link system, respectively. Locking condition and dependence of laser linewidth on coupling parameters in both regimes are studied, confirming mutual injection locking as a practical method for linewidth narrowing. For the short-delayed integrated lasers, a linewidth narrowing factor of 13 is demonstrated and sub-MHz linewidth is achieved, while for the long-delayed lasers coupled by fiber link, the intrinsic linewidth is reduced to sub-100 Hz.
Highlights
IntroductionSemiconductor lasers feature small foot-prints, low power consumption, high flexibility and compatibility with photonic integration circuits, they are widely used in various optical systems
Semiconductor lasers feature small foot-prints, low power consumption, high flexibility and compatibility with photonic integration circuits, they are widely used in various optical systems.Lasers suffer from frequency noise, which results from spontaneous emission and carrier noise, and the spectrum purity always casts a performance limit on different applications
The locking condition and the influence of system parameters on frequency noise is studied experimentally in both short and long delay regimes, demonstrating mutual injection locking as a practical approach for linewidth reduction
Summary
Semiconductor lasers feature small foot-prints, low power consumption, high flexibility and compatibility with photonic integration circuits, they are widely used in various optical systems. Demonstrate simple effective approach linewidthresearch narrowing mutualon coupling focuses on the nonlinear dynamics [19,20], can beresearch exploited realize based mutualmainly injection locking (MIL). There and photonic microwave generation [24] It is used forbest coherent havelasing been threshold relatively reduction few reports onHowever, laser linewidth or frequency noise characteristics upon mutual and [27]. Few reports on laser linewidth or frequency noise characteristics upon mutual injection locking. A systemic linewidth narrowing mechanism, locking condition and frequency noise noise reduction is out carried in the investigation. Locking conditionLocking and the condition dependence laser frequency of laser noise on are system parameters are investigated in both mutual regimes,injection confirming mutual noise onfrequency system parameters investigated in both regimes, confirming locking as a injection method locking as practical method for linewidth narrowing. Special features of proposed approach are discussed in comparison with classical techniques such as external cavity the proposed approach are discussed in comparison with classical techniques such as external lasers. lasers
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