Automatic Power Optimization of a 44 Tbit/s Real-Time Transmission System over 1900 km G.654.E Fiber and Widened C+L Erbium-Doped Fiber Amplifiers Utilizing 400 Gbit/s Transponders
Anxu Zhang,
Yuyang Liu,
Lipeng Feng,
Huan Chen,
Yuting Du,
Jun Wu,
Kai Lv,
Hao Liu,
Xia Sheng,
Xiaoli Huo
Affiliations
Anxu Zhang
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Yuyang Liu
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Lipeng Feng
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Huan Chen
WDM System Design Department of Wireline Product R&D Institute, ZTE Corporation, Wuhan 430073, China
Yuting Du
WDM System Design Department of Wireline Product R&D Institute, ZTE Corporation, Wuhan 430073, China
Jun Wu
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Yangtze Optical Fiber and Cable Joint Stock Limited Company, Wuhan 430073, China
Kai Lv
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Hao Liu
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Xia Sheng
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Xiaoli Huo
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, China Telecom Research Institute, Beijing 100876, China
Power unevenness, mainly induced by stimulated Raman scattering, has been a major problem in multi-band transmission systems, especially in the upcoming field-deployed 400 Gbit/s widened C band plus L band system for backbone long-haul and ultra-long-haul scenarios. To reduce the impact of power unevenness, we propose an automatic power optimization (APO) algorithm to guarantee reliable transmission for all channels, especially the channels at short wavelengths. The simulation results show that the power unevenness of output power after 5-span transmission in the C band is up to 11 dB before APO, while after APO is applied, it is greatly improved to less than 1.6 dB. To further investigate the performance of the APO scheme, we conduct a real-time 44 Tbit/s C+L transmission system over 1900 km G.654.E fiber utilizing 400 Gbit/s transponders. The experimental results show that the power unevenness has been effectively compensated from 12 dB to 4 dB in the entire 11 THz range, making the received optical signal-to-noise ratio relatively flat (3.4 dB). Moreover, the capacity and distance product of this system is 83.6 Pbit/s·km (44 Tbit/s × 1900 km), and to the best of our knowledge, this is a record capacity and distance product in the real-time single-mode fiber transmission system.
