Research on Adjustable Wavelength Transmitter-receiver Isolation Technology for Inter-satellite Laser Communication

With the rapid development of inter-satellite laser communication network technology and the widespread application of integrated optical antennas, it is crucial to achieve light beam transmitter-receiver isolation for optical antennas. At the same time, to achieve frequency point switching between homogeneous or heterogeneous constellations, the system urgently needs to have the ability to adjust the wavelength for transmitter-receiver isolation. In response to these needs, this paper focuses on the research on adjustable wavelength transmitter-receiver isolation based on Fabry-Perot (F-P) type thin film filter (TFF), analyzes the principle of thin film filter theoretically, and conducts experimental verification. When the target wavelength is 20 nm away from the local light wavelength, the system isolation can reach up to 81.3 dB, which is basically consistent with the theoretical analysis. The results show that the above method can achieve adjustable wavelength transmitterreceiver isolation for inter-satellite laser communication.