Abstract

We characterize the differential modal group delay (DMGD) arising in few-mode fibers (FMFs) based on the digital re-sampling technique, which is commonly used in current digital signal processing flow at the receiver-side. When the DMGD of a 291-m two-mode fiber is characterized over the C-band by using a 500-Mb/s non-return-to-zero (NRZ) signal and 1-GSa/s real-time oscilloscope, the experimental results are consistent with the DMGD obtained from the traditional time-of-flight (TOF) method. However, the wide-bandwidth instruments of the traditional TOF method can be replaced by cheap ones with a bandwidth of only a few hundred MHz, but the same temporal precision is achieved. Moreover, our proposed DMGD characterization method is not limited by the number of guided modes arising in the FMF, together with the capability to obtain both the DMGD value and its sign between two arbitrary guided modes.

© 2023 Optica Publishing Group

Simple and precise characterization of differential modal group delay arising in few-mode fiber

Zhe Fu, Junjie Zhang, Ziheng Zhang, Songnian Fu, Yuwen Qin, Lei Shen, Mengfan Cheng, Qi Yang, Ming Tang, Deming Liu, and Lei Deng
Opt. Lett. 46(12) 2856-2859 (2021)

Measurement of differential modal group delay of a few-mode fiber using a Fourier domain mode-locked laser

Varun Kelkar, Smaranika Swain, and Deepa Venkitesh
Opt. Lett. 43(9) 2165-2168 (2018)

Measurement of differential mode group delay in few-mode fibers based on Fresnel reflection peaks

Aodi Pang, Guijun Hu, Yi Qin, and Haiyan Wang
Appl. Opt. 62(26) 7044-7049 (2023)

Measurement of differential mode group delay in few-mode fiber with correlation optical time-domain reflectometer

Linqi Jin, Yong Wang, Meiling Zhang, Yadong Sun, and Guijun Hu
Appl. Opt. 61(13) 3579-3582 (2022)

Dynamic analysis of PAM-4 IM/DD OAM-based MGDM transmission enabled by mode-group filter approach

Jianbo Zhang, Xiong Wu, Alan Pak Tao Lau, Zhaohui Li, and Chao Lu
Opt. Lett. 48(12) 3259-3262 (2023)