A new 90-degree hybrid for coherent receivers in free-space laser communications

Lingyu Wan; Sushi Da; Liren Liu; Dean Liu

doi:10.1117/12.810980

9 February 2009 A new 90° hybrid for coherent receivers in free-space laser communications

Lingyu Wan, Sushi Da, Liren Liu, Dean Liu

Proceedings Volume 7158, 2008 International Conference on Optical Instruments and Technology: Microelectronic and Optoelectronic Devices and Integration; 71580D (2009) https://doi.org/10.1117/12.810980
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

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 E_S and local oscillator beam E_LO 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.

Citation Download Citation

Lingyu Wan, Sushi Da, Liren Liu, and Dean Liu "A new 90° hybrid for coherent receivers in free-space laser communications", Proc. SPIE 7158, 2008 International Conference on Optical Instruments and Technology: Microelectronic and Optoelectronic Devices and Integration, 71580D (9 February 2009); https://doi.org/10.1117/12.810980

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KEYWORDS

Crystals

Hybrid optics

Laser crystals

Receivers

Beam splitters

Polarization

Free space optics

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