Open AccessSpatial full-duplex light communication achieved with a monolithic non-suspended multicomponent system
Author(s) -
Wei Cai,
Bingcheng Zhu,
Shuai Zhang,
Chuan Qin,
Jinpeng Yuan,
Xin Wang,
Fenghua Zhang,
Yongjin Wang
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.003379
Subject(s) - materials science , optoelectronics , diode , optics , light emitting diode , responsivity , superluminescent diode , optical communication , physics , photodetector
The multiple-quantum-well diode (MQW-diode) inherently exhibits simultaneous behavior because of the overlap between the emission spectra and spectral responsivity of the MQW-diode. This feature makes it feasible to form a full-duplex light communication system when two identical MQW-diodes separately function as a transmitter and a receiver at the same time. To verify spatial full-duplex light communication, we fabricated and characterized a monolithic multicomponent system by integrating two InGaN waveguide-based MQW-diodes into a single chip. A 5-μm-wide air gap between two MQW-diodes was manufactured for precise alignment, which could yield spatial light transmission and coupling. Spatial co-time co-frequency full-duplex (CCFD) light communication was experimentally demonstrated using the monolithic multicomponent system, a self-interference cancellation scheme was used to extract the superimposed signals, and a full-duplex audio transmission experiment was performed, opening a promising route toward parallel information processing via free space based on the simultaneous light-emitting and light-detecting phenomenon of the MQW-diode.