Design and fabrication of optical 90° hybrid by birefringent crystals for coherent receiver in free-space optical communication system

Ya'nan Zhi; Yu Zhou; Jianfeng Sun; Liren Liu

doi:10.1117/12.859981

24 August 2010 Design and fabrication of optical 90° hybrid by birefringent crystals for coherent receiver in free-space optical communication system

Ya'nan Zhi, Yu Zhou, Jianfeng Sun, Liren Liu

Author Affiliations +

Proceedings Volume 7814, Free-Space Laser Communications X; 781411 (2010) https://doi.org/10.1117/12.859981
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

The design and fabrication of an optical 2×4 90° hybrid based on birefringent crystals for coherent receiver in free-space optical communication system are presented. For the quadrature receiver two pairs of 180° phase shifted outputs are obtained and one pair has a phase difference of 90° with respect to the other. The 90° hybrid comprises two pairs of stacked birefringent plates, a phase retardation plate and an analyser birefringent plate. The testing results measured by heterodyne method verify that the 2×4 optical 90° hybrid can work correctly and effectively. The phase compensation and further optimization schemes are also proposed.

Citation Download Citation

Ya'nan Zhi, Yu Zhou, Jianfeng Sun, and Liren Liu "Design and fabrication of optical 90° hybrid by birefringent crystals for coherent receiver in free-space optical communication system", Proc. SPIE 7814, Free-Space Laser Communications X, 781411 (24 August 2010); https://doi.org/10.1117/12.859981

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