A Bidirectional FSO Communication Employing Phase Modulation Scheme and Remotely Injection-Locked DFB LD

A bidirectional free-space optical (FSO) communication through a 600-m free-space transmission is built, employing a phase modulation (PM) scheme and a remotely injection-locked distributed feedback laser diode (DFB LD) for presentation. With optimum injection locking, a DFB LD is excellent for dupl...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 38; no. 21; pp. 5883 - 5892
Main Authors Huang, Xu-Hong, Li, Chung-Yi, Lu, Hai-Han, Chou, Cing-Ru, Hsia, Hsin-Mao, Chen, Yi-Hao
Format Journal Article
LanguageEnglish
Published New York IEEE 01.11.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bit error rate
Collaboration
Collaborative work
Converters
Dementia
Distributed feedback lasers
Ecosystems
Four-level pulse amplitude modulation (PAM4)
free-space optical (FSO) communication
Free-space optical communication
Frequency locking
Knowledge management
Organizations
Phase modulation
Pulse amplitude modulation
remotely injection-locked DFB LD
Semiconductor lasers
Technological innovation
Upstream
Wireless communications
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Summary:A bidirectional free-space optical (FSO) communication through a 600-m free-space transmission is built, employing a phase modulation (PM) scheme and a remotely injection-locked distributed feedback laser diode (DFB LD) for presentation. With optimum injection locking, a DFB LD is excellent for duplex transceiver operations. An injection-locked DFB LD not only operates as a PM-to-intensity modulation converter with an optical detector, but also functions as an upstream optical carrier. To be the first one of employing a remotely injection-locked DFB LD to detect a phase-modulated 25-Gb/s/25-GHz four-level pulse amplitude modulation (PAM4) passband signal, the DFB LD with remote injection locking is successfully intensity-modulated with an upstream 25-Gb/s non-return-to-zero (NRZ) signal. Good bit error rate performance and clear PAM4/NRZ eye diagrams show that this FSO communication can use a remotely injection-locked DFB LD to detect the downstream phase-modulated PAM4 signal and concurrently deliver an upstream intensity-modulated NRZ signal. This bidirectional 25-Gb/s/25-GHz (downstream)/25-Gb/s (upstream) FSO communication is prominent due to its enhancement in two-way high-speed optical wireless communications.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.3005714