Highly-sensitive coherent optical detection of M-ary frequency-shift keying signal
Author(s) -
K. Kikuchi,
Masayuki Osaki
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.19.000b32
Subject(s) - frequency shift keying , bit error rate , sensitivity (control systems) , computer science , transmitter , keying , modulation (music) , optics , electronic engineering , signal (programming language) , multiplexing , frequency division multiplexing , amplitude and phase shift keying , phase shift keying , orthogonal frequency division multiplexing , demodulation , telecommunications , physics , channel (broadcasting) , engineering , acoustics , programming language
We demonstrate M-ary frequency-shift keying (FSK) optical modulation and digital coherent detection, aiming at applications to space communications, where high receiver sensitivity is the most crucial consideration. The proposed FSK transmitter and receiver are based on the coherent orthogonal frequency-division multiplexing (OFDM) technique and feature simple configuration and low computational complexity. By offline bit-error rate measurements using a 256-FSK signal without the forward error-correction code, we obtain the receiver sensitivity as high as 3.5 photons per bit at the bit-error rate of 10(-3). The experimental result is in good agreement with simulations.