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Updated: May 21, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Optical microfiber mode interferometer for temperature-independent refractometric sensing.

G Salceda-Delgado¹, D Monzon-Hernandez, A Martinez-Rios

¹Centro de Investigaciones en Optica A.C., Loma del Bosque 115, col. Lomas del Campestre, Leon, Gto., 37150 Mexico.

|June 5, 2012

Summary

We developed a novel optical microfiber interferometer for precise, temperature-insensitive refractive index sensing. This device accurately measures external refractive index changes using spectral analysis, offering high resolution for various applications.

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Published on: April 26, 2014

Area of Science:

Photonics and Optical Sensing
Nanofiber Technology
Interferometry

Background:

Optical fiber sensors are crucial for measuring physical parameters.
Existing methods for refractive index sensing can be temperature-dependent.
High-resolution, stable sensing platforms are needed.

Purpose of the Study:

To demonstrate a functional optical microfiber mode interferometer.
To investigate its application in absolute, temperature-insensitive refractive index sensing.
To achieve high-resolution measurements of the surrounding refractive index.

Main Methods:

Fabrication of an optical microfiber with a 10 μm diameter.
Utilizing abrupt transitions to create an interferometer.
Analyzing the transmission spectrum's sinusoidal pattern and its period.
Employing Fast Fourier Transform (FFT) for accurate period measurement.

Main Results:

The interferometer exhibits a sinusoidal transmission spectrum due to mode beating.
The spectral pattern's period is highly sensitive to the surrounding refractive index.
The device demonstrates temperature-insensitivity.
A refractive index measurement range of 1.33 to 1.428 was achieved.
A maximum resolution of approximately 3.7×10⁻⁶ was obtained.

Conclusions:

The optical microfiber mode interferometer is a viable tool for absolute refractive index sensing.
Its temperature-insensitive nature enhances reliability in diverse environments.
The FFT-based analysis provides accurate and high-resolution measurements.