Optical Sideband Injection Locking Using Waveguide Based External Cavity Semiconductor Lasers for Narrow-Line, Tunable Microwave Generation

Photonics

Md.Rezaul Hoque Khan¹  Md.Ashraful Hoque¹ 

[1] Islamic University of Technology, Dhaka, Gazipur 1704, Bangladesh;

关键词: optical injection locking;    microwave carrier generation;    hybrid photonic integration;    locking range;   

DOI  :  10.3390/photonics6030081

来源: DOAJ

【 摘 要 】

The generation by optical injection locking of spectrally unadulterated microwave signals using waveguide based external cavity semiconductor lasers (WECSL) is demonstrated. A tunable frequency of 2−11 GHz, limited by the modulator’s bandwidth and the photodetector (PD), was created as proof-of-experiment by the injection locking of the two WESCLs. A single sideband (SSB) phase noise of −75 dBc/Hz from the generated carrier at 10 kHz offset and a phase noise variance at an optimum injection ratio region was 0.03 rad², corresponding to 1.7°, were observed. The main feature of this approach is the consolidation of the upsides of microwave generation at low phase noise with a broad tuning range and the capacity of hybrid photonic integration. In addition, the injection locking characteristics were used to determine the Q factor of the complicated optical cavities with unknown inner losses.

【 授权许可】

Unknown