A simple all-fiber comb filter based on the combined effect of multimode interference and Mach-Zehnder interferometer

Guorui Zhou, Rahul Kumar, Qiang Wu, Wai Pang Ng, Richard Binns, Nageswara Lalam, Xinxiang Miao, Longfei Niu, Xiaodong Yuan, Yuliya Semenova, Gerald Farrell, Jinhui Yuan, Chongxiu Yu, Xinzhu Sang, Xiangjun Xin, Bo Liu, Haibing Lv*, Yong Qing Fu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

A polarization-dependent all-fiber comb filter based on a combination effect of multimode interference and Mach-Zehnder interferometer was proposed and demonstrated. The comb filter was composed with a short section of multimode fiber (MMF) fusion spliced with a conventional single mode fiber on the one side and a short section of a different type of optical fiber on the other side. The second type of optical fiber is spliced to the MMF with a properly designed misalignment. Different types and lengths of fibers were used to investigate the influence of fiber types and lengths on the performance of the comb filter. Experimentally, several comb filters with free spectral range (FSR) values ranging from 0.236 to 1.524 nm were achieved. The extinction ratio of the comb filter can be adjusted from 6 to 11.1 dB by varying polarization states of the input light, while maintaining the FSR unchanged. The proposed comb filter has the potential to be used in optical dense wavelength division multiplexing communication systems.
Original languageEnglish
Article number11803
Number of pages8
JournalScientific Reports
Volume8
Early online date7 Aug 2018
DOIs
Publication statusPublished - Dec 2018

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