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Ultra-High Capacity Optical Transmission Technologies for 100 Tbit/s Optical Transport Networks
Akihide SANO Takayuki KOBAYASHI Eiji YOSHIDA Yutaka MIYAMOTO
Publication
IEICE TRANSACTIONS on Communications
Vol.E94-B
No.2
pp.400-408 Publication Date: 2011/02/01 Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.400 Print ISSN: 0916-8516 Type of Manuscript: Special Section INVITED PAPER (Special Section on Extremely Advanced Optical Transmission Technologies and Transmission Optical Fiber Technologies towards Exabit Era) Category: Keyword: coherent optical communication, multi-level modulation, QAM, Raman amplification,
Full Text: FreePDF(1.5MB)
Summary:
This paper describes ultra-high capacity wavelength-division multiplexed (WDM) transmission technologies for 100-Tbit/s-class optical transport networks (OTNs). First, we review recent advances in ultra-high capacity transmission technologies focusing on spectrally-efficient multi-level modulation techniques and ultra-wideband optical amplification techniques. Next, we describe an ultra-high capacity WDM transmission experiment, in which high speed polarization-division multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM), generated by an optical synthesis technique, in combination with coherent detection based on digital signal processing with pilotless algorithms, realize the high spectral efficiency (SE) of 6.4 b/s/Hz. Furthermore, ultra-wideband hybrid optical amplification utilizing distributed Raman amplification (DRA) and C- and extended L-band erbium-doped fiber amplifiers (EDFAs) is shown to realize 10.8-THz total signal bandwidth. By using these techniques, 69.1-Tbit/s transmission is demonstrated over 240-km of pure silica-core fibers (PSCFs). Furthermore, we describe PDM 64-QAM transmission over 160 km of PSCFs with the SE of 9.0 b/s/Hz.
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