Direct phase modulation via optical injection: theoretical study

Direct phase modulation via optical injection is a newly developed method for coding the of gain-switched laser, which meets high requirements placed on transmitters quantum key distribution: compactness, low losses, compatibility with CMOS technologies, and absence undesirable effects leading to side-channel information leakage. Despite successful implementation good prospects further development this system, there still lack theoretical investigations scheme in literature. Here, first time, we perform its analysis. We study influence spontaneous emission noise, examine role gain non-linearity consider effect temperature drift. The results obtained reveal that these phenomena significantly affect system performance. have tried formulate here practical instructions, will help take features into account when elaborating employing optical-injection-based modulator.