Refractive index sensor based on a combination of optical frequency comb with intracavity multi-mode interference fiber sensor

R. Oe; T. Minamikawa; S. Taue; Y. Nakajima; K. Minoshima; T. Yasui

doi:10.1117/12.2540787

28 August 2019 Refractive index sensor based on a combination of optical frequency comb with intracavity multi-mode interference fiber sensor

R. Oe, T. Minamikawa, S. Taue, Y. Nakajima, K. Minoshima, T. Yasui

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111991D (2019) https://doi.org/10.1117/12.2540787
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

Refractive index measurement is important for evaluation of liquid materials, optical components, and bio sensing. One promising approach for such measurement is use of optical fiber sensors such as surface plasmonic resonance or multimode interference (MMI), which measure the change of optical spectrum resulting from the refractive index change. However, the precision of refractive index measurement is limited by the performance of optical spectrum analyzer. If such the refractive index measurement can be performed in radio frequency (RF) region in place of optical region, the measurement precision will be further improved by the frequency-standard-based RF measurement. To this end, we focus on the disturbance-to-RF conversion in a fiber optical frequency comb (OFC) cavity. Since frequency spacing f_rep of OFC depends on an optical cavity length nL, f_rep sensitively reflects the external disturbance interacted with nL. Although we previously demonstrated the precise strain measurement based on the f_rep measurement, the measurable physical quantity is limited to strain or temperature, which directly interacts with the fiber cavity itself. If a functional fiber sensor can be installed into the fiber OFC cavity, the measurable physical quantity will be largely expanded. In this paper, we introduce a MMI fiber sensor into a ring-type fiber OFC cavity for refractive index measurement. We confirmed the refractive-indexdependent shift of optical spectrum event though the MMI fiber sensor is included in the cavity. Such the spectral shift was converted into refractive-index-dependent shift of f_rep via the wavelength dispersion of the cavity fiber.

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R. Oe, T. Minamikawa, S. Taue, Y. Nakajima, K. Minoshima, and T. Yasui "Refractive index sensor based on a combination of optical frequency comb with intracavity multi-mode interference fiber sensor", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991D (28 August 2019); https://doi.org/10.1117/12.2540787

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KEYWORDS

Fiber optics sensors

Brain-machine interfaces

Refractive index

Sensors

Single mode fibers

Radio optics

Frequency combs

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