Lasers, Fiber Optics, and Communications

Characterizing the differential mode group delay and modal dispersion of long few-mode fiber based on electrical spectral interferometry

[+] Author Affiliations
Jianping Li, Yanqing Zhou, Jiawei Luo

Jinan University, Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Guangzhou, China

Yuanhua Feng

Jinan University, Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Guangzhou, China

Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Guangzhou, China

Zhaohui Li

Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Guangzhou, China

Opt. Eng. 56(3), 036110 (Mar 23, 2017). doi:10.1117/1.OE.56.3.036110
History: Received December 22, 2016; Accepted March 7, 2017
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Abstract.  We experimentally demonstrate a fast, simple, and accurate method based on the electrical spectral interferometry for measuring the differential mode group delay (DMGD) and chromatic dispersion (CD) between the higher order modes and the fundamental mode in a 5-km few-mode fiber (FMF). The interferogram information of multiple modes of the measured FMF is recorded and used to deduce the relative delay by applying the FFT processing with a simple mathematical algorithm. Based on the acquired relative delay of different fiber modes, the DMGD and CD can be obtained about (2.27 to 2.36) ps/m, (1.4 to 2.3) ps/nm.km for LP11 mode and (4.56 to 4.68) ps/m, (1.1 to 1) ps/nm.km for LP21 mode, respectively, for this tested FMF. At the same time, a precision of ±0.0015  ps/m for DMGD measurement has been achieved. The experimental results show that the demonstrated method could be a good solution to the characterization of FMF used in large capacity SDM transmission systems.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Jianping Li ; Yanqing Zhou ; Jiawei Luo ; Yuanhua Feng and Zhaohui Li
"Characterizing the differential mode group delay and modal dispersion of long few-mode fiber based on electrical spectral interferometry", Opt. Eng. 56(3), 036110 (Mar 23, 2017). ; http://dx.doi.org/10.1117/1.OE.56.3.036110


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