Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 14, Pages 4848-4854Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3169029
Keywords
Optical fibers; Fiber lasers; Laser modes; Loss measurement; Filtering; Silicon compounds; Optical fiber losses; Fiber with high-index absorbing rods; mode anticrossing; mode coupling; optical losses
Funding
- Russian Science Foundation [21-19-00528]
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This study presents a detailed investigation on a novel type of optical fiber for spectral filtering, which utilizes a step-index core with high-index rods embedded into silica cladding. It is experimentally confirmed that this structure can achieve a very sharp stopband and can be used for creating shortpass fiber spectral filters.
In this work, we perform a detailed study of a novel type of optical fiber for spectral filtering, which is based on a step-index core with high-index rods embedded into silica cladding. Recently, it was theoretically predicted that such a structure could demonstrate a very sharp stopband due to the resonant core mode interaction with the eigen high-index rod mode. In the current paper, we realize the proposed structure and experimentally confirm its applicability for spectral filtering. In our experiments, we show the possibility of creating a very sharp shortpass fiber spectral filter. In particular, we demonstrate a change in the optical loss of the core mode by two orders of magnitude (from less than 0.1 dB/m to more than 10 dB/m) for a 12 nm wavelength shift (from 1008 nm to 1020 nm) and by more than 3 orders of magnitude (from 0.02 dB/m to 60 dB/m) for a 70 nm wavelength shift (from 980 to 1050 nm). Possible applications of the realized fiber design are discussed. Mechanisms of optical loss in the fabricated structure are studied, and the presence of an additional mechanism, which is not related to absorption in the high-index rods, is revealed.
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