Photoelectric hybrid detection device based on 2*4 90-degree optical bridge

Abstract

The invention discloses a photoelectric hybrid detection device based on a 2*4 90-degree optical bridge. The photoelectric hybrid detection device comprises a signal light source, a tunable local oscillator laser light source, a 2*4 90-degree free space optical bridge, a first balance detector, a second balance detector, a first mixer, a second mixer, a differentiator, a loop filter, a voltage-controlled oscillator, a signal receiver and a phase shifter. The photoelectric hybrid detection device is implemented via the mixture of light and the mixture of electricity, thus the requirement on the tunable local oscillator laser light source is reduced, and the phase change can be rapidly tracked and the rapid locking can be achieved. The photoelectric hybrid detection device plays an essential role in the implementation of the high-precision laser satellite communication in the future.

Description

technical field [0001] The invention relates to free space coherent optical communication, in particular to a photoelectric hybrid detection device based on a 2×490° optical bridge. Background technique [0002] Free-space coherent optical communication technology has attracted widespread attention due to its advantages of high receiving sensitivity, but there are complex problems in its system, especially the high-speed and wide-range tunable local oscillator light source is difficult to achieve, so we developed the photoelectric hybrid detection system Research. This will be of great significance to large-scale, high-bandwidth free-space coherent optical communications. [0003] The prior art [1] (LeonidG.Kazovsky, Balanced Phase-Locked Loops for Optical Homodyne Receivers: Performance Analysis, Design Considerations, and Laser Line width Requirements [J], IEEE Journal of Lightwave Technology, 1986, 4(2): 182-195) shows that the maximum allowable optical homodyne receiver...

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Problems solved by technology

[0003] The prior art [1] (LeonidG.Kazovsky, Balanced Phase-Locked Loops for Optical Homodyne Receivers: Performance Analysis, Design Considerations, and Laser Line width Requirements [J], IEEE Journal of Lightwave Technology, 1986, 4(2): 182-195) shows that the maximum allowable optical homodyne receiver based on decision-making The laser line width is Δv=3.1×10 -4 R b , the optimal ring noise bandwidth is B opt =[4.72ΔvRkP S / q] 1 / 2 ; Existing technology [2] (LeonidG.Kazovsky, Decision-drivenphase-lockedloopforopticalhomodynereceivers:Performanceanalysisandlaserlinewidthrequirements[J], IEEEJournalofLightwaveTechnology, 1985,3(6):1238~1247) shows that based on decision-driven optical homodyne receiver maximum allowable The laser line width is Δv=5.9×10 -6 R b , the optimal ring noise bandwidth is The above two receivers have received widespread attention due to their respective advantages, but they all have a common disadvantage, that is, it is difficult to realize high-speed and large-range tunable local oscillator light sources.

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