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28 January 2019 2.5- and 5-Gbps time-delay self-homodyne interference differential phase-shift keying optical receiver for space-to-ground communication link
Yanan Zhi, Jianfeng Sun, Yu Zhou, Wei Lu, Enwen Dai, Weiqing Pan, Liren Liu
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Optical Engineering, Vol. 58, Issue 1, 016114 (January 2019). https://doi.org/10.1117/1.OE.58.1.016114
Abstract
The availability and reliability of the high data rate space-to-ground optical coherent communication links are critically challenged because the wave front of the signal beam is distorted and impaired when propagating through atmospheric turbulence. Based on the free-space interference of two successive data bits delayed by an unequal-arm-length Mach–Zehnder interferometer (MZI), a pupil-matching time-delay self-homodyne interference differential phase-shift keying (DPSK) optical receiver with 2  ×  4 90-deg optical hybrid is designed for the high data rate space-to-ground optical communication links due to its immunity from wave front impairment. The delayed optical path difference (OPD) in the unequal-arm-length MZI corresponds to the duration of one bit and can be stabilized to below 1000th of the wavelength by the closed-loop feedback control. The maximum system insertion loss is <1  dB. The measurement accuracy of OPD in unequal-arm-length MZI is 0.01 mm by the deramping method from a chirped laser. The double-bit-rate 2.5-  /  5-Gbps DPSK optical receiver has been presented. Parallel and separate atmospheric measurement along the optical communication link is also performed simultaneously. The 2.5-and 5-Gbps optical communication links have already been verified with a ϕ300-mm receiving telescope between two buildings in downtown over a distance of 2.4 km in the worst-case atmospheric conditions. The measured bit-error-rate is better than 10  −  6. Without wave front compensation of the adaptive optics, local oscillator, and optical phase-locked loops, the pupil-matching time-delay self-homodyne interference DPSK optical receiver has great significance for future developments of space-to-ground optical communication links.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Yanan Zhi, Jianfeng Sun, Yu Zhou, Wei Lu, Enwen Dai, Weiqing Pan, and Liren Liu "2.5- and 5-Gbps time-delay self-homodyne interference differential phase-shift keying optical receiver for space-to-ground communication link," Optical Engineering 58(1), 016114 (28 January 2019). https://doi.org/10.1117/1.OE.58.1.016114
Received: 5 September 2018; Accepted: 3 January 2019; Published: 28 January 2019
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Cited by 3 scholarly publications and 1 patent.
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KEYWORDS
Receivers
Phase shift keying
Optical communications
Free space optics
Atmospheric turbulence
Satellites
Adaptive optics
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