Open AccessHigh-sensitivity DPSK receiver for high-bandwidth free-space optical communication links
Author(s) -
Juan C. Juarez,
David W. Young,
Joseph E. Sluz,
Larry B. Stotts
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.010789
Subject(s) - keying , dynamic range , free space optical communication , optics , sensitivity (control systems) , optical communication , bandwidth (computing) , physics , bit error rate , optical link , phase noise , phase shift keying , computer science , automatic gain control , forward error correction , optical amplifier , telecommunications , electronic engineering , optical fiber , amplifier , engineering , laser , channel (broadcasting) , decoding methods
A high-sensitivity modem and high-dynamic range optical automatic gain controller (OAGC) have been developed to provide maximum link margin and to overcome the dynamic nature of free-space optical links. A sensitivity of -48.9 dBm (10 photons per bit) at 10 Gbps was achieved employing a return-to-zero differential phase shift keying based modem and a commercial Reed-Solomon forward error correction system. Low-noise optical gain was provided by an OAGC with a noise figure of 4.1 dB (including system required input loses) and a dynamic range of greater than 60 dB.