Open Access80 Gbit/s, 256 QAM coherent transmission over 150 km with an injection-locked homodyne receiver
Author(s) -
Keisuke Kasai,
Yixin Wang,
Shohei Beppu,
Masato Yoshida
Publication year - 2015
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.23.029174
Subject(s) - homodyne detection , direct conversion receiver , optics , phase noise , quadrature amplitude modulation , physics , qam , phase modulation , injection locking , signal (programming language) , transmission (telecommunications) , telecommunications , laser , computer science , bit error rate , decoding methods , programming language
We demonstrate an 80 Gbit/s, 5 Gsymbol/s 256 QAM coherent optical transmission by employing an injection-locked homodyne detection circuit based on both fiber lasers and LDs. With either circuit, low phase noise carrier-phase synchronization between the transmitted data signal and an LO were achieved with a phase noise variance of only 0.2 degrees. As a result, we have successfully transmitted an 80 Gbit/s data signal over 150 km with a simple receiver configuration. This is the highest QAM multiplicity yet realized with injection-locked homodyne detection.