Chirped fiber Bragg grating sensor based on phase delay

Qizhen Sun; Deming Liu; Hairong Liu; Li Xia; Ping Shum

doi:10.1117/12.743535

21 November 2007 Chirped fiber Bragg grating sensor based on phase delay

Qizhen Sun, Deming Liu, Hairong Liu, Li Xia, Ping Shum

Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 67812K (2007) https://doi.org/10.1117/12.743535
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

A novel design of linearly chirped fiber Bragg grating (LCFBG) based sensor, operating at a single optical wavelength and avoiding the complicated interrogation, is presented and demonstrated. The LCFBG exhibits a good linear relation between the group delay and the wavelength. When a pulsed optical signal goes through the LCFBG with a fixed wavelength within the grating bandwidth, it will be reflected at a particular spatial location along the grating and then will induce a particular time delay, which is direct proportional to the temperature applied on the grating. The time delay is an absolute parameter as well as the wavelength shift, resulting that it is insensitive to optical power fluctuation and loss. In order to measure the time delay accurately, the RF modulation technique is employed. The sensor setup is mainly composed of a narrowband laser source, a Mach-Zehnder electro-optic modulator driven by RF oscillator signal to provide an optical carrier, a 3dB fiber coupler to split the modulated signal into two parts, an optical circulator, a LCFBG with good linear behaviour of group delay spectrum as the sensor head, and two fast photo-detectors. The feasibility of the proposed sensor is demonstrated by numerical simulation, and the simulation result shows that the LCFBG can be used as a good temperature sensor.

Citation Download Citation

Qizhen Sun, Deming Liu, Hairong Liu, Li Xia, and Ping Shum "Chirped fiber Bragg grating sensor based on phase delay", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67812K (21 November 2007); https://doi.org/10.1117/12.743535

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KEYWORDS

Sensors

Fiber Bragg gratings

Temperature metrology

Head

Computer simulations

Phase measurement

Modulation

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