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.
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