Study on Characteristics of Coupled-Core Four-Core Fibers With Different Core Pitches

作者：Junjie Xiong, Lin Ma, Yanming Chang, Tianqi Cheng, Lei Shen, Lei Zhang, Changkun Yan, Lin Sun, Qingwen Liu, Zuyuan He · 发表于：IEEE photonics journal · 年份：2023 · DOI：10.1109/jphot.2023.3341415 · 被引用次数：10 · 研究领域：Optical Network Technologies、Photonic Crystal and Fiber Optics、Advanced Fiber Optic Sensors

We studied the characteristics of coupled-core four-core fibers (CC-4CFs) with different core pitches both theoretically and experimentally. The spatial mode dispersions of different fibers were analyzed, and the result agrees well with theoretical ones. In the experiment, we achieved a spatial mode dispersion as low as 3.72 ps/km1/2for a 4 km-long CC-4CF with core pitch of 19 μm at a bending radius of 8 cm. The impulse response matrices of four core fibers with different core pitches was investigated using swept-wavelength interferometry over 100 nm bandwidth. The impulse responses were Gaussian-shaped and consistent between different inputs and outputs for CC-4CFs. Our results show that the CC-4CFs with core pitches of 17 and 19 μm exhibit narrower pulse broadening. In addition, the mode-dependent losses of different fibers were analyzed. For the fibers with core pitch of 19 μm, the estimated mode-dependent loss was lower than 3 dB for the entire 100 nm bandwidth. Our results are especially helpful for developing coupled-core multicore fibers for long-haul transmission applications.