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Wave-surface differential interference space light demodulator

An optical demodulator and space technology, applied in the direction of optical demodulation, instrumentation, optics, etc., can solve the problems of output signal without position information, unable to use precise tracking, and not providing signal position detection, etc.

Active Publication Date: 2011-11-09
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

In the prior art [1], the output signal has no position information and cannot be used for fine tracking
The DPSK demodulation described in the prior art [2] (see Adaptive optics and ESA'soptical ground station, Proc. SPIE, Vol.7464, 746406, 2009) uses a free-space Mach-Zehnder interferometer or Michelson interferometer instrument, but it does not provide signal position detection, and it cannot be used for fine tracking

Method used

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0016] Such as figure 1 as shown, figure 1 It is a schematic diagram of the main structure of the wavefront differential interference spatial optical demodulator of the present invention, and is also a schematic diagram of the main structure of the embodiment of the present invention. It can be seen from the figure that the wavefront differential interference spatial optical demodulator of the present invention is composed of a first polarization beam splitter A polarizing beam splitter 1, the polarizing beam splitting surface 1a of the first polarizing beam splitter 1 is 45° to the advancing direction of the input circularly polarized light, and the first polarizing beam splitter 1 splits the input circularly polarized light into polarized The reflected light and the tran...

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Abstract

The invention relates to a wave-surface differential interference space light demodulator, and in particular relates to a free space light demodulator of DPSK (differential phase shift keying) signals. The wave-surface differential interference space light demodulator provided by the invention comprises a block polarization beam splitting device, a beam combining device, a reflector and a pupil matching time differential interferometer which comprises two groups of pupil imaging lenses. The wave-surface differential interference space light demodulator provided by the invention is used for demodulating the light signals in a space laser communication receiver; the output data light signals are used for balance detection; and the output position light signals can be used for fine tracking.

Description

technical field [0001] The present invention relates to space laser communication, in particular to a wavefront differential interference space optical demodulator, which is a differential phase shift keying (hereinafter referred to as DPSK) signal free space optical demodulator, which consists of a block polarization beam splitter , a beam combining device, a mirror, and two sets of pupil imaging lenses form a pupil-matched time-difference interferometer. It is used for optical signal demodulation in the space laser communication receiver, the output data optical signal is used for balance detection, and the output position optical signal is used for fine tracking. Background technique [0002] In space laser communication, when passing through the atmospheric channel, the laser transmission is affected by factors such as turbulence, and the quality of the wavefront decreases. To overcome the influence of factors such as atmospheric turbulence, there are mainly methods suc...

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Application Information

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IPC IPC(8): G02F2/00H04B10/02H04B10/60
Inventor 栾竹周煜孙建锋职亚楠刘立人
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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