Tunable acoustic bursts for customized tapered fiber Bragg structures

Abstract

The inscription of customized fiber Bragg structures under acoustic excitation is proposed and demonstrated. By setting the proper acoustic excitation function, the desired spectrum of the grating can be achieved. In this paper, the effect of applying a burst acoustic wave during the process of Bragg grating inscription using the direct writing method through a phase mask is investigated. Among all the characteristics that can be changed due to a periodic defect insertion in the uniform Bragg structure, the control of phase is used to demonstrate this assertion. The results of numerical simulations are shown to be in excellent agreement with experiments. It can be further extended to generate multiple phase shifts in optical fiber and/or waveguides, if the defects are inserted at different positions, as is shown.

Acousto-Optic Effect in Microstructured Polymer Fiber Bragg Gratings: Simulation and Experimental Overview

“…9 (b)). The AOM is the same used in our previous works [10,11]. The silica horn length is L horn = 50 mm, with a base diameter Φ = 3 mm, a tip diameter Φ = 1 mm and central hole diameter Φ=150.5 μm.…”

“…It has been successfully applied in the design and construction of various low insertion loss alloptical processing devices such as a tunable optical notch filter [8], tunable mode coupler [9], complex Bragg grating writing [10], gain equalization filter [11], among others. Concerning its mechanical properties, it is expected that the AO effect in mPOF would be more evident due to its lower acoustic impedance so improving the performance compared to the SF based devices.…”