A monolithic integrated injection-locked distributed feedback laser based on reconstruction equivalent chirp technique is proposed. It is proved that the optical injection-locked enhances the quality of optical frequency comb, which can realize the wide range adjustment of different comb spacing within 2GHz-10GHz. The 10-db spectral width of the OFC with different comb spacing is between 66-119GHz. CNR up to 45dB.
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.
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