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Open Access
Nonlinearity Mitigation of PDM-16QAM Signals Using Multiple CSI-OPCs in Ultra-Long-Haul Transmission without Excess Penalty

Takeshi UMEKI, Takayuki KOBAYASHI, Akihide SANO, Takuya IKUTA, Masashi ABE, Takushi KAZAMA, Koji ENBUTSU, Ryoichi KASAHARA, Yutaka MIYAMOTO

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Summary :

We developed a polarization-independent and reserved-band-less complementary spectral inverted optical phase conjugation (CSI-OPC) device using dual-band difference frequency generation based on highly efficient periodically poled LiNbO3 waveguide technologies. To examine the nonlinearity mitigation in a long-haul transmission using a large number of OPCs, we installed a CSI-OPC device in the middle of a pure silica core fiber-based recirculating loop transmission line with a length of 320km. First, we examined the fiber-input power tolerance after 5,120-km and 6,400-km transmission using 22.5-Gbaud PDM-16QAM 10-channel DWDM signals and found a Q-factor improvement of over 1.3dB along with enhanced power tolerance thanks to mitigating the fiber nonlinearity. We then demonstrated transmission distance extension using the CSI-OPC device. The use of multiple CSI-OPCs enables an obvious performance improvements attained by extending the transmission distance from 6,400km to 8,960km, which corresponds to applying the CSI-OPC device 28 times. Moreover, there was no Q-factor degradation for the link in a linear regime after applying the CSI-OPC device more than 16 times. These results demonstrate that the CSI-OPC device can improve the nonlinear tolerance of PDM-16QAM signals without an excess penalty.

Publication
IEICE TRANSACTIONS on Communications Vol.E103-B No.11 pp.1226-1232
Publication Date
2020/11/01
Publicized
2020/05/22
Online ISSN
1745-1345
DOI
10.1587/transcom.2019OBP0001
Type of Manuscript
Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Category

Authors

Takeshi UMEKI
  NTT Corporation
Takayuki KOBAYASHI
  NTT Corporation
Akihide SANO
  NTT Corporation
Takuya IKUTA
  NTT Corporation
Masashi ABE
  NTT Corporation
Takushi KAZAMA
  NTT Corporation
Koji ENBUTSU
  NTT Corporation
Ryoichi KASAHARA
  NTT Corporation
Yutaka MIYAMOTO
  NTT Corporation

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