Ultra-High Capacity WDM Transmission Using Spectrally-Efficient PDM 16-QAM Modulation and C- and Extended L-Band Wideband Optical Amplification

Author

Sano, Akihide ; Masuda, Hiroji ; Kobayashi, Takayuki ; Fujiwara, Masamichi ; Horikoshi, Kengo ; Yoshida, Eiji ; Miyamoto, Yutaka ; Matsui, Munehiro ; Mizoguchi, Masato ; Yamazaki, Hiroshi ; Sakamaki, Yohei ; Ishii, Hiroyuki

Author_Institution

NTT Network Innovation Labs., NTT Corp., Yokosuka, Japan

Volume

29

Issue

4

fYear

2011

Firstpage

578

Lastpage

586

Abstract

This paper describes ultrahigh capacity transmission based on spectrally-efficient multi-level modulation and wideband optical amplification techniques. 21.4-Gbaud polarization-division multiplexed (PDM) 16-ary quadrature amplitude modulation (QAM) signals are generated by utilizing an optical synthesis technique, wavelength-multiplexed with 25-GHz spacing by optical pre-filtering, and received by an intradyne coherent receiver based on digital signal processing (DSP) with pilotless algorithms. These techniques realize a spectral efficiency (SE) of 6.4 b/s/Hz. Furthermore, a hybrid amplification technique that combines distributed Raman and dual-band erbium-doped amplifiers (EDFAs) realizes 10.8-THz signal bandwidth in C- and extended L-bands. By using these techniques, we successfully demonstrate 69.1 Tb/s transmission over 240 km of low loss pure silica core fibers.

Keywords

erbium; optical fibre amplifiers; optical filters; optical modulation; optical receivers; quadrature amplitude modulation; wavelength division multiplexing; C-band wideband optical amplification; DSP; bandwidth 10.8 THz; bit rate 69.1 Tbit/s; digital signal processing; distributed Raman amplifiers; dual-band erbium-doped amplifiers; extended L-band wideband optical amplification; frequency 25 GHz; hybrid amplification technique; intradyne coherent receiver; low loss pure silica core fibers; multilevel modulation; optical prefiltering; optical synthesis technique; pilotless algorithms; polarization-division multiplexed 16-ary quadrature amplitude modulation; spectrally-efficient PDM 16-QAM modulation; ultra-high capacity WDM transmission; wavelength division multiplexing; Extended L-band erbium-doped fiber amplifier (EDFA); Raman amplification; coherent detection; multi-level modulation; quadrature amplitude modulation (QAM); wavelength-division multiplexing (WDM);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2011.2107030

Filename

5692800