Open AccessOptical phase‐sensitive amplification of higher‐order QAM signal with single Mach–Zehnder amplitude modulator
Author(s) -
Shimizu S.,
Kobayashi T.,
Kazama T.,
Umeki T.,
Enbutsu K.,
Kasahara R.,
Miyamoto Y.
Publication year - 2021
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/ell2.12002
Subject(s) - quadrature amplitude modulation , physics , transmitter , amplitude modulation , optics , optical modulation amplitude , electro optic modulator , optical amplifier , phase modulation , signal (programming language) , qam , modulation (music) , phase shift keying , sideband , phase noise , telecommunications , optical modulator , frequency modulation , computer science , bandwidth (computing) , bit error rate , acoustics , channel (broadcasting) , laser , quantum mechanics , microwave , programming language
An optical phase‐sensitive amplifier (PSA) has the potential of low‐noise optical amplification. A frequency non‐degenerate PSA (ND‐PSA) can amplify arbitrary modulation formats including higher‐order QAM. The ND‐PSA requires a co‐propagating phase conjugated light (idler light) that has been conventionally created with an optical phase conjugator at the transmitter side. We propose a transmitter configuration using simultaneous signal generation of both a signal and its idler by double‐sideband modulation for transmission systems with ND‐PSAs. The proposed scheme provides a simple configuration with a single Mach–Zehnder amplitude modulator without optically creating the idler light. We performed experiments using 16QAM, 32QAM, and probabilistically shaped 256QAM signals. As a result, a phase‐sensitive amplification with each modulation format was successfully demonstrated using the proposed transmitter configuration.