Design of a Chirped Fiber Bragg Grating for Use in Wideband Dispersion Compensation

Abstract

A wideband chirped fiber Bragg grating (FBG) dispersion compensator operating in C band is designed theoretically by numerically solving the coupled mode equations. The power reflectivity spectrum and dispersion characteristics of the chirped fiber Bragg gratings are analysed. In order to achieve wideband dispersion compensation with a low insertion loss, grating length, average refractive index change, apodization profile and chirp parameter of the grating should be precisely optimized. The chirped FBG designs achieved in this study have resulted in a negative dispersion of 4.95 ps/nm for a grating length of L = 10 mm and a negative dispersion of 9.76 ps/nm for a grating length of L = 20 mm with 16 nm bandwidth at around 1550 nm.

Analysis and Design of Chirped Fiber Bragg Grating for Temperature Sensing for Possible Biomedical Applications

“…CFBGs behave like a chain of FBGs inside an optical fiber, where each grating reflects one specific wavelength, returning a broadband spectrum that depends on several parameter as temperature, strain, applied along the whole grating length [30], [31]. Thanks to their specific features, CFBGs are now widely used in optical communication systems [32], [33] and in sensor applications, i.e., in mechanical engineering for strain and crack detection [34], [35].…”

Apodized, plane-by-plane written chirped fiber Bragg gratings in polarization-maintaining fibers for dispersion control in all-fiber ultrafast lasers

“…To ensure a constant pulse shape of an ultrafast laser interacting with the cFBG element, the spectral reflectivity and the group delay characteristics can be made more stable by applying an apodization to the fiber grating. 10 The resulting reflectivity spectrum of an apodized chirped fiber Bragg grating (acFBG) was calculated by using the coupled mode theory and transfer matrix method 26 and is presented in Fig. 2.…”

“…The cFBGs are small-size, lowcost, and precise optical components integrated directly in the fiber. [8][9][10] Especially nonlinear cFBGs, which are capable of second and higherorder dispersion compensation, are of high interest as stretcher and compressor optical elements in ultrafast laser systems. 11 Infrared (IR)-femtosecond laser inscribed cFBGs in PM fibers enable a controllable dispersion compensation in all-fiber ultrafast laser systems, which was demonstrated by Chen 12 and Woodwart.…”

Influence of Integrated Optical Feedback on Tunable Lasers

“…The SMSR should have a minimum for a minimum of the gain voltage because this implies low losses for the lasing mode. However, the shape of the Bragg grating [26] impacts the mirror losses of the lasing mode and its neighbor. As we approximate the maxima surface of the gain distribution and Bragg reflectivity by a normal distribution the theory and the measurement may not show consistent phase dependency.…”