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. 2019 Feb 16;19(4):806.
doi: 10.3390/s19040806.

Hollow Fiber Coupler Sensor

Nithin Kuruba  1 , Tao Lu  2
Affiliations

Hollow Fiber Coupler Sensor

Nithin Kuruba et al. Sensors (Basel). .

Abstract

We present a bi-conical optical directional coupler composed of solid and hollow core fibers. Through an evanescent wave coupling mechanism, the detection of liquid refractive index and its temperature are demonstrated. The experimental results illustrated that the sensor offers a sensitivity of 4.03 ± 0.50 volts per refractive index units (V/RIU) for refractive indices ranging from 1.331 ± 0.003 to 1.403 ± 0.003 with a resolution of 3.5 × 10 - 3 refractive index units (RIU).

Keywords: biosensor; directional coupler; hollow core fiber.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Experiment setup for SCF–HCF fiber coupler; (b) Schematic drawing of the sensor.
Figure 2
Figure 2
(a) Refractive index versus various concentration of glycerine solution in DPBS; (b) Output voltage versus the refractive index of glycerine/DPBS mixture; (c) Measured power in SCF as a function of temperature of the coupler filled with DI water.
Figure 3
Figure 3
(a) Fiber-pulling setup holding fibers; (b) Transmission in SCF due to coupling of power in to HCF; (c) Cross section of SCF–HCF coupler; (d) Coupler staged on a microscopic glass slide and being held by quick epoxy.
Figure 4
Figure 4
Exchange of optical power between SCF and HCF according to Equation (2).
See this image and copyright information in PMC

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