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首页> 外文期刊>Optics Letters >Widely tunable and ultrasensitive leaky-guided multimode fiber interferometer based on refractive-index-matched coupling
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Widely tunable and ultrasensitive leaky-guided multimode fiber interferometer based on refractive-index-matched coupling

机译：基于折射率匹配耦合的可调谐，超灵敏的漏导多模光纤干涉仪

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摘要

This investigation presents a simple, widely tunable, and ultrasensitive sensor that is based on a leaky-guided multimode fiber interferometer (MMFI) operated under refractive-index-matched coupling. By use of a material with an appropriate dispersion profile around the MMFI as a cladding yields strong index-matched coupling, which performs ultrasensitive sensing in variations of the surroundings. Index matching at a single wavelength yields a coupling wavelength dip with a narrow bandwidth and a high extinction ratio of over 25 dB. The wavelength dip can also be effectively tuned, greatly shifting with a variation in temperature (T) or refractive index (RI), when the index-matched condition is satisfied. This work demonstrates that the proposed sensor responds sensitively to T with an extremely high tuning efficiency of 50 nm/(deg C) and an excellent sensitivity to RI of 113,500 nm per RI unit.
机译：这项研究提出了一种简单，可广泛调谐且超灵敏的传感器，该传感器基于在折射率匹配耦合下工作的漏导多模光纤干涉仪（MMFI）。通过在MMFI周围使用具有适当色散分布的材料作为包层，可以产生强折射率匹配的耦合，从而在环境变化中执行超灵敏的传感。在单个波长下进行折射率匹配会产生耦合波长骤降，其带宽窄且消光比高，超过25 dB。当满足折射率匹配条件时，还可以有效地调谐波长骤降，并随温度（T）或折射率（RI）的变化而发生很大变化。这项工作表明，提出的传感器对T敏感，具有50 nm /（deg C）的极高调谐效率，对每个RI单元的RI灵敏度为113,500 nm。

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