Tunable Chirped Fiber Bragg Grating Filter Based on Special Strain Function Modulation and Its Application in Fiber Sensor

• Published in: Journal of lightwave technology Vol. 26; no. 14; pp. 2286 - 2290
• Main Authors: Dong, Bo, Zhao, Qida, Liu, Lihui, Huang, Guiling, Jin, Long, Zhou, Jin, Liao, Tongqing
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 15.07.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bandwidth; Bragg gratings; Capacitive sensors; Chirp; Chirp modulation; Circuit properties; cylinder taper cantilever beam; Cylinders; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; fiber Bragg grating (FBG); Fiber gratings; Fiber lasers; Fiber-optic instruments; Fibers; filter; Filters; General equipment and techniques; Information, signal and communications theory; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Integrated optics. Optical fibers and wave guides; Modulation; Modulation, demodulation; Optical and optoelectronic circuits; Optical fiber sensors; Optical instruments, equipment and techniques; Physics; Sensors; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Signal and communications theory; Strain; Strain control; Structural beams; Telecommunications and information theory; Tunable circuits and devices; Integrated optics; Tunable circuit; Chirp; Fiber laser; Measurement sensor; Bragg grating; Grating in fiber; Cantilever beam; Fiber optic sensors; Solid state laser; filter; fiber Bragg grating (FBG); Modulation; Bandwidth; Strain distribution; Feasibility; Optical fiber; Fiber filter; cylinder taper cantilever beam
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2008.923243

A novel technique for chirp control of a uniform fiber Bragg grating (FBG) based on the special strain function modulation is presented. A cylinder taper cantilever beam (CTCB) is specially designed and capable of providing special position-dependent strain function gradients along an originally uniform FBG, which allows tunable quasi-triangular and quasi-Gauss-gradient FBG filter. Furthermore, the feasibility of the tunable chirped FBG based on the strain function modulation as sensor is validated. This state-of-art technique is expected to be applied in fiber filter, FBG sensor and multiwavelength fiber laser.