Tunable fiber Bragg grating filters realized by chirp rate tuning with a cantilever beam

Abstract

An efficient scheme to change the chirp rate of a fiber Bragg grating (FBG) has been developed based on a specially-designed cantilever beam with the beam-bending method. It allows, to date, the largest tuning range of 36 nm in reflection bandwidth of a chirped-FBG (CFBG) while keeping the center wavelength nearly fixed during the tuning process. Using this method, bandwidth-tunable fiber grating filters with tunable chromatic dispersion or differential group delay have been demonstrated. Channel spacing-tunable multi-wavelength filters based on both sampled-and superimposed-CFBGs have also been realized. Moreover, tuning of the bandwidth and channel spacing is continuous with this scheme that makes the achieved devices more flexible.

Wide Tunability Microwave Photonic Filter Based on Brillouin-Raman Fiber Laser: A Modeling Study

“…When the length of the SMF increases, so does the attenuation, therefore alternate delay lines can be used such as a linearly chirped fiber Bragg grating(LCFBG) which can reach very high dispersion without the attenuation. This also gives the device another option of tuning its FSR such as manipulating LCFBGs with applied strain, temperature, electrical and magnetic effects [17][18][19].…”

Optical fiber grating vibration sensor for vibration monitoring of hydraulic pump

“…The structure of the monitoring system is greatly simplified [5]. The optical fiber itself has the advantages of electrical insulation, anti electromagnetic interference, and good environmental adaptability, and can be highly integrated with the modern communication equipments, which provides a new technical approach for the vibration monitoring of the hydraulic system [6,7]. The vibration signal sensing and detection technology of the hydraulic pump is the core of the whole monitoring system, and its performance directly affects the stability, sensitivity, and reliability of the whole monitoring system [8][9][10].…”