Coherent lightwave receivers with a laser diode local oscillator for interorbit optical communication

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Abstract
Coherent lightwave receivers are experimentally demonstrated with a laser diode as local light source. The laser diode local oscillator is available for not only reducing weight and power consumption of a coherent receiver, but expanding the wavelength tuning range of receiver. In our study, a narrow line-width (-9 is experimentally achieved in the PSK coherent system. The PSK coherent receiver also shows good wavelength tracking characteristics for the variation of signal beam wavelength. It is demonstrated that the combination of tunable local optical sources and an intermediate frequency-phase lock loop (PLL) is effective to compensate Doppler effect, which is indispensable in inter-orbit communication link. In addition, a trade-off between the intensity modulation direct detection (IM-DD) system and coherent system oriented to the inter-orbit optical communication link is discussed based on the experimental results.

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