Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Uniform-fiber-Bragg-grating-based Fabry-Perot Cavity for Passive-optical-network Fault Monitoring

  • Xuan, Zhang (College of Electronic Science and Engineering, University of Electronic Science and Technology of China) ;
  • Ning, Ning (College of Electronic Science and Engineering, University of Electronic Science and Technology of China) ;
  • Tianfeng, Yang (College of Physics and Electronic Engineering, Sichuan Normal University)
  • Received : 2022.08.17
  • Accepted : 2022.12.02
  • Published : 2023.02.25
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Abstract

We propose a centralized passive-optical-network monitoring scheme using the resonance-spectrum properties of a Fabry-Perot cavity based on fiber Bragg gratings. Each cavity consists of two identical uniform fiber Bragg gratings and a varying cavity length or grating length, which can produce a unique single-mode resonance spectrum for the drop-fiber link. The output spectral properties of each cavity can be easily adjusted by the cavity length or the grating length. The resonance spectrum for each cavity is calculated by the transfer-matrix method. To obtain the peak wavelength of the resonance spectrum more accurately, the effective cavity length is introduced. Each drop fiber with a specific resonance spectrum distinguishes between the peak wavelength or linewidth. We also investigate parameters such as reflectivity and bandwidth, which determine the basic performance of the fiber Bragg grating used, and thus the output-spectrum properties of the Fabry-Perot cavity. The feasibility of the proposed scheme is verified using the Optisystem software for a simplified 1 × 8 passive optical network. The proposed scheme provides a simple, effective solution for passive-optical-network monitoring, especially for a high-density network with small end-user distance difference.

Keywords

Acknowledgement

National Natural Science Foundation of China (NSFC 61901289).

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