An All Fiber Intrinsic Fabry-Perot Interferometer Based on an Air-Microcavity

Abstract

Abstract:In this work an Intrinsic Fabry-Perot Interferometer (IFPI) based on an air-microcavity is presented. Here the air microcavity, with silica walls, is formed at a segment of a hollow core photonic crystal fiber (HCPCF), which is fusion spliced with a single mode fiber (SMF). Moreover, the spectral response of the IFPI is experimentally characterized and some results are provided. Finally, the viability to use the IFPI to implement a simple, compact size, and low cost refractive index sensor is briefly analyzed.

Photonic crystal fiber Fabry-Perot interferometers with high-reflectance internal mirrors

“…The micro-FPIs were entirely embedded in the fiber and exhibited excellent fringe visibility of up to 20 dB due to the mirror-finish quality of two cavity surfaces, which was superior to that of most FPIs based on the fusion splicing method [7][8][9][10][11]. The strain sensitivity of the device can be enhanced to 4.5 pm/ by reshaping the air cavity created in the fiber.…”

“…So researchers have been developing different methods to fabricate the air cavity based on different techniques, for example wet chemical etching [3,4], laser micromachining [5,6], and splicing different types of optical fibers with the commercialized fusion splicer [7][8][9][10][11][12]. Most of the above-mentioned FPIs can be good choices for strain sensing since a minute change in the cavity size leads to a detectable shift in the interference pattern [4-6, 8, 9, 11, 12].…”

A Brief Review of New Fiber Microsphere Geometries

“…Some years later, the usage of a CO 2 laser was proposed for the formation of a spherical lens at the tip of optical fibers [2]. Since then, several fabrication techniques were proposed for the fabrication of hollow and solid microspheres, such as the use of a femtosecond laser [3] or a fusion splicing machine [4][5][6].…”

“…Microspheres created on top of optical fibers were vastly explored given the possibility of exciting whispering gallery modes [5], opening new paths in different fields of research. Moreover, this kind of structure can also be produced to work as interferometric cavities.…”

Sub- and Nanosecond Pulsed Lasers Applied to the Generation of Broad Spectrum in Standard and Microstructured Optical Fibers

“…This phenomenon was first observed for the first time in 1970 by Alfano and Shapiro in bulk borosilicate glass [1]. Thanks to the invention and production of photonic crystal fibers (PCFs), the SG experiencing a great boom in many areas of research such as sensors, nonlinear optics, spectroscopy, optical coherence tomography, pulse compression, telecommunication, wavelength tunable source [2][3][4][5][6], and many other topics. Supercontinuum generation involves a series of nonlinear phenomena, such as four wave mixing (FWM), modulation instability (MI), self-phase and cross-phase modulation (SPM and XPM), Stimulated Raman (SRS), Stimulated Brillouin Scatering (SBS) and the formation of higher-order solitons, as presented in several publications [7][8][9].…”