Open AccessDesign System of Optical Heterodyne Detection Based on Temperature Sensor
Author(s) -
Dheyaa A. Resen,
Shehab A. Kadhim,
Aseel I. Mahmood,
A T Lateef
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/518/4/042009
Subject(s) - optics , fiber bragg grating , wavelength , optical fiber , signal (programming language) , photodetector , materials science , fiber optic sensor , heterodyne (poetry) , refractive index , laser , optoelectronics , physics , computer science , acoustics , programming language
Optical Heterodyne Detection (OHD) technique is based on two separate sources with optical interference between them. The optical signal from a specific light source is compared with a separate reference signal from another source. The Fiber Bragg grating (FBG) reflect a specific wavelength λ B and transmit the other wavelengths within the laser source spectral. This is achieved by changing the refractive index generated by periodic variation of optical fiber core, which reflect a specific wavelength, so FBG can be used to withhold a certain wavelength and allow other wavelengths to transmit. In this paper, a new method of an OHD has been designed using Optisystem software. Optical fiber as a temperature sensor element with single source and two FBGs have used in this system. the first FBG used as a tunable source and the other has used as a sensing element. The two optical signals have been combined utilizing a photodetector. It has a linear response to the light energy, while having a quadratic response with the amplitude of the electromagnetic field. The results show that the beat frequency shift has a linear response to the temperature with sensitivity about 2.24 GHz/C o .