21 August 2009 Optical birefringent 90° hybrid for coherent receiver in free-space optical communication system
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Abstract
The design of an optical birefringent 90° hybrid for coherent receiver in free-space optical communication system is presented. The bulk optical design of 2×4 90° hybrid is a six-port device with two inputs and four outputs. For the balanced receiver configuration two pairs of 180° phase shifted outputs are obtained and one pair has a phase shift of 90° with respect to the other. The optical birefringent 90° hybrid includes two pairs of birefringent plates, an analyser plate and a λ/8 wave plate. The scheme of phase compensation is also presented.
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Ya'nan Zhi, Yu Zhou, Jianfeng Sun, Aimin Yan, Zhu Luan, Lijuan Wang, Liren Liu, "Optical birefringent 90° hybrid for coherent receiver in free-space optical communication system", Proc. SPIE 7464, Free-Space Laser Communications IX, 746410 (21 August 2009); doi: 10.1117/12.824680; https://doi.org/10.1117/12.824680
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