1. 2.5- and 5-Gbps time-delay self-homodyne interference differential phase-shift keying optical receiver for space-to-ground communication link
- Author
-
Zhi Yanan, Jianfeng Sun, Pan Weiqing, Enwen Dai, Yu Zhou, Wei Lu, and Liren Liu
- Subjects
Physics ,business.industry ,General Engineering ,Optical communication ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Direct-conversion receiver ,Interferometry ,020210 optoelectronics & photonics ,Optics ,Interference (communication) ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,business ,Adaptive optics ,Optical path length ,Free-space optical communication ,Phase-shift keying - 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
- Published
- 2019