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Proceedings Paper

An aperture-matched phase-compensated differential phase shift keying receiver with a 90° hybrid
Author(s): Zhu Luan; Yu Zhou; Yanan Zhi; Enwen Dai; Jianfeng Sun; Liren Liu
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Paper Abstract

Space to ground laser communication is limited by the effects of atmosphere. Differential phase shift keying (DPSK) is suited for high data rate space to ground communication links due to its immunity of the wave front of a beam passing atmospheric turbulence, which carry the information in optical phase changes between bits. The benefit of DPSK over OOK is the 3 dB lower optical signal to noise ratio to reach a given bit error rate (BER) using a balanced receiver. An aperture-matched phase-compensated DPSK receiver with a 90° hybrid is proposed here. The receive optics are based on free-space optics. A Mach-Zehnder delay interferometer is used for differential delay which is equal to the bit period. The input pupil is imaged onto the same place by two afocal systems composed of 4f imaging lenses. The optical path difference is stabilized to a faction of the wavelength with a fine phase adjustment which is measured by a 2×4 90° optical hybrid and closed loop electric circuit. The design and experiments are given in this paper. optical hybrid and closed loop electric circuit. The design and experiments are given in this paper. optical hybrid and closed loop electric circuit. The design and experiments are given in this paper.

Paper Details

Date Published: 15 September 2011
PDF: 6 pages
Proc. SPIE 8162, Free-Space and Atmospheric Laser Communications XI, 81620O (15 September 2011); doi: 10.1117/12.891125
Show Author Affiliations
Zhu Luan, Shanghai Institute of Optics and Fine Mechanics (China)
Yu Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Yanan Zhi, Shanghai Institute of Optics and Fine Mechanics (China)
Enwen Dai, Shanghai Institute of Optics and Fine Mechanics (China)
Jianfeng Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8162:
Free-Space and Atmospheric Laser Communications XI
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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