Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 33, Issue 8, Pages 407-410Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2021.3067165
Keywords
Optical fiber filters; Optical fiber couplers; Microwave filters; Filtering theory; Optical fiber theory; Optical fiber polarization; Fiber gratings; Tilted fiber Bragg grating; Fabry-Perot filter; mode converter; narrow-bandwidth
Funding
- Fundamental Research Funds for the Central Universities [2019YJS012]
- National Natural Science Foundation of China [62075008, 62075007, 62005013]
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The proposed narrow-bandwidth few-mode FP filter based on TFBGs employs a few-mode fiber with a ring-core structure. The TFBGs serve as reflecting mirrors and mode converters in the FP cavity, enabling the conversion of vector modes at specific wavelengths. This filter is suitable for applications in fiber lasers and mode/wavelength division multiplexing systems.
We propose and demonstrate a narrow-bandwidth few-mode Fabry-Perot (FP) filter based on the tilted fiber Bragg gratings (TFBGs). The proposed filter is based on the few mode fiber which possesses ring-core structure. The two TFBGs function as the reflecting mirrors in the FP cavity as well as the mode converters. Therefore, compared with the traditional FP filter and mode converter, the proposed FP filter can realize the conversion of vector modes at specific wavelengths with narrow-bandwidth characteristic. The proposed FP filter can find applications in fiber lasers, mode/wavelength division multiplexing system.
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