IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Regular Section
Spectrally Efficient Frequency-Domain Optical CDM Employing QAM Based on Electrical Spatial Code Spreading
Shin KANEKO, Sang-Yuep KIM, Noriki MIKI, Hideaki KIMURA, Hisaya HADAMA, Koichi TAKIGUCHI, Hiroshi YAMAZAKI, Takashi YAMADA, Yoshiyuki DOI
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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

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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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© 2011 The Institute of Electronics, Information and Communication Engineers
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