A Stable and Compact Optical Module for Fiber-Optic Gyroscope Application

This article introduces a new design for a bi-directional optical subassembly for fiber-optic gyroscope applications that integrates a super-luminescent light-emitting diode, a photodiode, a beam splitter, an isolator, a fiber receptacle, and a thermal electric cooler. It is less than 1.5 cm in diameter and 2.5 cm in height. As chip temperature was kept at 30 degrees C under environment temperature of -35 degrees C, 25 degrees C, and 75 degrees C, the bi-directional optical sub-assembly reached stability at a center wavelength of 1,539 nm and a wavelength shift of 1.5 nm. A 3D simple model with the finite-element method was used to analyze thermal performance.