Transmissive fiber Bragg grating-based delay line interferometer for RZ-OOK to NRZ-OOK format conversion

Xin Liu, Zuowei Xu, Miguel A. Preciad, Adenowo Gbadebo, Lin Zhang, Jiabi Xiong, Yu Yu, Hui Cao, Xuewen Shu

Research output: Contribution to journalArticlepeer-review


We propose a return-to-zero on-off keying (RZ-OOK) to non-return-to-zero (NRZ) OOK conversion scheme based on a transmissive phase-modulated fiber Bragg grating (PM-FBG). The PM-FBG has a spectrum similar to the combination of a delay line interferometer and a narrow band optical filter, which is designed and synthesized using numerical optimization algorithm. The coupling strength of the PM-FBG is almost uniform and the grating period varies along the fiber length according to the optimization method. The designed PM-FBG has been fabricated using advanced ultraviolet laser inscription technique. Experimental results show that such a PM-FBG can perform RZ-OOK to NRZ-OOK format conversion successfully.
Original languageEnglish
Pages (from-to)140300 - 140304
JournalIEEE Access
Early online date28 Aug 2019
Publication statusPublished - 31 Dec 2019

Bibliographical note

This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see

Funding: National Natural Science Foundation of China (NSFC) (61775074), 111 Project (B07038) and Natural Science Foundation of Guangdong Province, China (2015A030313633).


  • Bragg gratings
  • fiber optics
  • optical fiber devices
  • optical signal processing
  • optical fiber communication


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