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Proceedings Paper

A new 90° hybrid for coherent receivers in free-space laser communications
Author(s): Lingyu Wan; Sushi Da; Liren Liu; Dean Liu
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Paper Abstract

Using the birefringence properties and the electro-optic effect of LiNbO3 crystal, an optical 90°-hybrid with 2 input ports and 4 output ports is designed in this paper. The new optical hybrid consists mainly of two pairs of LiNbO3 crystal plates with the same sizes, the modulating electrodes and a polarization analyzer. One pair of LiNbO3 crystal plates split incoming signal beam ES and local oscillator beam ELO into four light beams and the other mix them into two synthetic beams. By adjusting applied voltage on the LiNbO3 crystal plates, 4 output ports from the polarization analyzer give the narrow mixed beams with a relative phase shift 90°. The optical hybrid has the advantage of low losses and good stability of the phase shift. It has the great potential for wide applications in free-space coherent laser communications and laser radar.

Paper Details

Date Published: 9 February 2009
PDF: 9 pages
Proc. SPIE 7158, 2008 International Conference on Optical Instruments and Technology: Microelectronic and Optoelectronic Devices and Integration, 71580D (9 February 2009); doi: 10.1117/12.810980
Show Author Affiliations
Lingyu Wan, Guangxi Univ. (China)
Sushi Da, Guangxi Univ. (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Dean Liu, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7158:
2008 International Conference on Optical Instruments and Technology: Microelectronic and Optoelectronic Devices and Integration
Xuping Zhang; Wojtek J. Bock; Xiaoyi Bao; Ping Shum, Editor(s)

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