A parallel hybrid-integrated optical injection locking (PHOIL) DFB laser with narrow linewidth is experimentally demonstrated by using REC technology. The linewidth of the PHOIL DFB laser is significantly narrowed under the injection locking state. The linewidth of the PHOIL DFB laser is measured to be under 100 kHz, compared with 1034.2 kHz under free running state. The narrowest linewidth of the PHOIL DFB laser can be as low as 31.9 kHz. The nonlinear distortions of the PHOIL DFB lasers, including third-order intermodulation distortion (IMD3) and spurious-free dynamic range (SFDR), are also suppressed significantly. The IMD3 is reduced by 4.33 dB and SFDR is also increased from 77.63 dB·Hz2/3 to 82.71 dB·Hz2/3.
High-quality microwave generation and frequency up-conversion are demonstrated utilizing a photonic integrated two-section DFB laser. Both the DFB lasers are fabricated by the reconstruction-equivalent-chirp (REC) technique. We acquire microwave signals by optical heterodyne. High-quality microwave signal can be generated by the optical injection locking technique with low phase noise of -96.3 dBc/Hz at 10-kHz and narrow linewidth of a few kHz level. Besides, Frequency-doubled and frequency-quadrupled signals are achieved respectively.
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