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Proceedings Paper

Design of 2*6 optical hybrid in inter-satellite coherent laser communications
Author(s): Nan Xu; Liren Liu; De'an Liu; Lingyu Wan; Yu Zhou
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Paper Abstract

Compared with direct detection, homodyne binary phase shift keying receivers can achieve the best sensitivity theoretically, and became the trend of the research and application in inter-satellite coherent laser communications. In coherent optical communication systems an optical hybrid is an essential component of the receiver. It demodulates the incoming signal by mixing it with the local oscillator. We present a design of a 2*6 optical hybrid. 4 output ports of the hybrid give the narrow mixed beams of the incoming signal and the local oscillator shifted by 90°for communication, and the others give the wide mixed beams with a shifted degree of 180°for position errors detection. CCD captures the interference pattern from the wide beams, and then the pattern is processed and analyzed by the computer. Target position information is obtained from characteristic parameter of the interference pattern. The position errors as the control signals of PAT (pointing, acquisition and tracking) subsystem drive the receiver telescope to keep tracking to the target. The application extends to coherent laser rang finder.

Paper Details

Date Published: 19 August 2008
PDF: 7 pages
Proc. SPIE 7091, Free-Space Laser Communications VIII, 70910T (19 August 2008); doi: 10.1117/12.793964
Show Author Affiliations
Nan Xu, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)
De'an Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Lingyu Wan, Guangxi Univ. (China)
Yu Zhou, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7091:
Free-Space Laser Communications VIII
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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