Microwave photonics filtering technique for interrogating long weak fiber Bragg grating sensors

Long fiber Bragg grating sensor interrogation using discrete-time microwave photonic filtering techniques.

A novel technique for interrogating photonic sensors based on long fiber Bragg gratings (FBGs) is presented and experimentally demonstrated, dedicated to detect the presence and the precise location of several spot events. The principle of operation is based on a technique used to analyze microwave photonics (MWP) filters. The long FBGs are used as quasi-distributed sensors. Several hot-spots c...

Microwave Photonics for High-Resolution and High-Speed Interrogation of Fiber Bragg Grating Sensors

Conventional fiber Bragg grating sensors have a few limitations, such as limited interrogation resolution and speed and difficulty in separating different measurands. In this article, microwave photonic techniques applied to fiber Bragg grating sensors to improve the interrogation resolution and speed are discussed. Experimental results to validate the techniques are provided.

Unique Solution of Short Pulse Propagation in Nonlinear Fiber Bragg Grating

In this study, a new numerical method is introduced to obtain the exact shape of output pulse in the chalcogenide fiber Bragg grating (FBG). A Gaussian pulse shape with 173 ps width is used as an input pulse for lunching to a 6.6 mm nonlinear FBG. Because of bistable and hysteresis nature of nonlinear FBG the time sequence of each portion of pulse is affected the shape of output pulse. So we di...

Ultra High Resolution OSA for Characterizing and interrogating Fiber Bragg Grating Sensors Introduction to Fiber Optic Sensors

Optimization of Bistability in Nonlinear Chalcogenide Fiber Bragg Grating for All Optical Switch and Memory Applications

We solve the coupled mode equations governing the chalcogenide nonlinear fiber Bragg gratings (FBGs) numerically, and obtain the bistability characteristics. The characteristics of the chalcogenide nonlinear FBGs such as: switching threshold intensity, bistability interval and on-off switching ratio are studied. The effects of FBG length and its third order nonlinear refractive index on FBG cha...