| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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An Optical 2×4 90° Hybrid Based on a Birefringent Crystal for a Coherent Receiver in a Free-Space Optical Communication System |
| HOU Pei-Pei, ZHI Ya-Nan**, ZHOU Yu, SUN Jian-Feng, LIU Li-Ren
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Key Laboratory of Space Laser Communication and Testing Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
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| Cite this article: |
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HOU Pei-Pei, ZHI Ya-Nan, ZHOU Yu et al 2011 Chin. Phys. Lett. 28 074204 |
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Abstract The design and fabrication of an optical 2×4 90° hybrid based on birefringent crystals for a coherent receiver in a free−space optical communication system are presented. For the quadrature receiver, two pairs of 180° phase−shift 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 the 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.
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| Keywords:
42.79.Sz
42.70.Mp
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Received: 09 July 2010
Published: 29 June 2011
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| PACS: |
42.79.Sz
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(Optical communication systems, multiplexers, and demultiplexers?)
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42.70.Mp
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(Nonlinear optical crystals)
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