Spectrally Efficient Frequency-Domain Optical CDM Employing QAM Based on Electrical Spatial Code Spreading

Regular Section

Shin KANEKO, Sang-Yuep KIM, Noriki MIKI, Hideaki KIMURA, Hisaya HADAMA, Koichi TAKIGUCHI, Hiroshi YAMAZAKI, Takashi YAMADA, Yoshiyuki DOI

Author information

Shin KANEKO
NTT Access Network Service Systems Laboratories, NTT Corporation
Sang-Yuep KIM
NTT Access Network Service Systems Laboratories, NTT Corporation
Noriki MIKI
NTT Access Network Service Systems Laboratories, NTT Corporation
Hideaki KIMURA
NTT Access Network Service Systems Laboratories, NTT Corporation
Hisaya HADAMA
NTT Access Network Service Systems Laboratories, NTT Corporation
Koichi TAKIGUCHI
NTT Photonics Laboratories, NTT Corporation
Hiroshi YAMAZAKI
NTT Photonics Laboratories, NTT Corporation
Takashi YAMADA
NTT Photonics Laboratories, NTT Corporation
Yoshiyuki DOI
NTT Photonics Laboratories, NTT Corporation

Keywords: optical access network, optical CDM, spatial code spreading, multi-level modulation, self-homodyne detection

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2011 Volume E94.B Issue 10 Pages 2877-2880

DOI https://doi.org/10.1587/transcom.E94.B.2877

Details

Abstract

We propose frequency-domain optical code-division- multiplexing (CDM) employing quadrature-amplitude-modulation (QAM) using two of multi-level (M-ary) data generated based on electrical-domain spatial code spreading. Its spectral efficiency is enhanced compared to the conventional scheme with amplitude-shift-keying (ASK) using only one of M-ary data. Although it demands the recovery of amplitude and optical phase information, the practicality of the receiver is retained with self-homodyne detection using a phase-shift-keying (PSK) pilot light. Performance is theoretically evaluated and the optimal parameters are derived. Finally, the feasibility of the proposed technique is experimentally confirmed.

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