Abstract

A periodically poled LiNbO₃ (PPLN)-based phase-sensitive amplifier (PSA) has the potential of ultra-low-noise and high-gain optical amplification. For the wideband operation of PSAs in optical fiber transmission, the chromatic dispersion (CD) that causes gain ripples is required to be compensated at the PSA input. We proposed a method to accurately estimate CD from the gain characteristic of a PSA. Estimated CD can be compensated by feed backing it to a spatial light modulator-based CD controller. This paper demonstrates a 2-THz wavelength-division multiplexing (WDM) single-span transmission using a PPLN-based PSA with CD pre-equalization based on our proposed method. The 20-channel WDM signal was modulated with single-polarized 96-Gbaud PS-64QAM, and its net data rate was 400 Gbps/channel. 2-THz signal bandwidth (4-THz bandwidth including an idler band) was the widest bandwidth in the fiber transmission using the PSA. We also discuss the system design of phase-sensitively amplified links for a high-symbol-rate and wideband WDM signal.

First demonstration of high-order QAM signal amplification in PPLN-based phase sensitive amplifier

T. Umeki, O. Tadanaga, M. Asobe, Y. Miyamoto, and H. Takenouchi
Opt. Express 22(3) 2473-2482 (2014)

Impact of pump-phase noise in PPLN-based optical parametric amplifier and wavelength converter for digital coherent transmission

Shimpei Shimizu, Akira Kawai, Takayuki Kobayashi, Masanori Nakamura, Takushi Kazama, Masashi Abe, Koji Enbutsu, Takeshi Umeki, and Yutaka Miyamoto
Opt. Express 32(10) 18268-18292 (2024)

Non-degenerate phase-sensitive amplification scheme using digital dispersion pre-equalization for unrepeated transmission

Shimpei Shimizu, Takushi Kazama, Takayuki Kobayashi, Takeshi Umeki, Koji Enbutsu, Ryoichi Kasahara, and Yutaka Miyamoto
Opt. Express 29(6) 8451-8461 (2021)

In-line phase sensitive amplifier based on PPLN waveguides

Takeshi Umeki, Masaki Asobe, and Hirokazu Takenouchi
Opt. Express 21(10) 12077-12084 (2013)

Purely nonlinear amplified ultralow-noise transmission using hybrid second-order DRA and PPLN-based PSA

Guibin Zhang, Zhirong Chen, Weiyu Zhang, Jiangbin Du, Xiaojie Guo, and Zhaohui Li
Opt. Lett. 48(7) 1694-1697 (2023)