Extrinsic fiber Fabry-Perot interferometer for measuring the refractive index of waveguides inscribed in glass

Monserrat Alonso-Murias; Astrid Saldaña-Sánchez; Gloria Verónica Vázquez; Joel Villatoro; David Monzón-Hernández

doi:10.1117/12.2678186

23 May 2023 Extrinsic fiber Fabry-Perot interferometer for measuring the refractive index of waveguides inscribed in glass

Monserrat Alonso-Murias, Astrid Saldaña-Sánchez, Gloria Verónica Vázquez, Joel Villatoro, David Monzón-Hernández

Author Affiliations +

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126432N (2023) https://doi.org/10.1117/12.2678186
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

An extrinsic fiber Fabry-Perot interferometer (EFFPI) is proposed and implemented for the characterization of waveguides inscribed by the femtosecond-laser direct writing technique. Various waveguides of 7.08 mm in length were inscribed in a soda-lime glass substrate by varying the laser scanning velocity in order to induce different refractive index (RI) changes. The measurement of the RI of the waveguide was carried out by means of an EFFPI formed between the end face of a multicore fiber (MCF) with seven coupled cores and the two polished surfaces of the inscribed waveguide. The end face of the MCF tip provided a broad beam and a wide effective area to ensure a large collection of the reflected light. The optical spectrum obtained by the interference of the multiple reflected beams was transformed to the Fourier domain and visualized in real-time. In the Fourier domain, the waveguides’ optical path length (OPL) was obtained and used to calculate its refractive index since its physical length was fixed and known. To obtain the value of the RI of the medium surrounding the waveguide, the fiber tip was displaced parallel to the polished surface, about 40 μm far from the center of the waveguide. The relative refractive index difference (Δn), which defines the light propagation and the insertion loss in a waveguide, was calculated for each waveguide inscribed at different velocities.

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Monserrat Alonso-Murias, Astrid Saldaña-Sánchez, Gloria Verónica Vázquez, Joel Villatoro, and David Monzón-Hernández "Extrinsic fiber Fabry-Perot interferometer for measuring the refractive index of waveguides inscribed in glass", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126432N (23 May 2023); https://doi.org/10.1117/12.2678186

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KEYWORDS

Waveguides

Refractive index

Multicore fiber

Reflection

Glasses

Fabry–Perot interferometry

Fabry Perot interferometers

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