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IEICE Transactions on Communications 2005 E88-B(1):195-202; doi:10.1093/ietcom/E88-B.1.195
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Copyright © 2005 The Institute of Electronics, Information and Communication Engineers

Ultra-Dense WDM with over 100% Spectral Efficiency Using Co-polarized 40-Gb/s Inverse-RZ Signals

Masahiro OGUSU1, Kazuhiko IDE1 and Shigeru OHSHIMA1

1 The authors are with Corporate Research & Development Center, Toshiba Corporation, Kawasaki-shi, 212-8582 Japan. E-mail: masahiro.ogusu{at}toshiba.co.jp

An inverse-RZ modulation scheme for dense WDM systems is proposed. Inverse-RZ signals have tolerances to chromatic dispersion and optical bandwidth limitation. The strongly pre-filtered inverse-RZ signals can be adapted to ultra-dense WDM systems, in which the spectral efficiencies are over 1.0 b/s/Hz. We have confirmed the error-free transmission of pre-filtered and co-polarized 40-Gb/s inverse-RZ signals where the channel intervals were 37.5 GHz.

Key Words: dense WDM systems, spectral efficiency, 40Gb/s, inverse-RZ signals

Manuscript received December 26, 2003. Manuscript revised July 5, 2004.


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