Optimization of apodized linearly chirped fiber gratings for optical communications

Abstract

The dispersion characteristics of apodized, linearly chirped fiber Bragg gratings and their potential as dispersion compensators have been studied systematically. It is shown that the positive hyperbolic-tangent profile results in an overall superior performance, as it provides highly linearized time-delay characteristics with minimum reduction in the linear dispersion. To compensate for the linear dispersion of 100 km of standard telecom fiber over certain bandwidth (in nanometers), the required grating length is 19.24 cm/nm.

Numerical Analysis of Apodized Fiber Bragg Gratings Using Coupled Mode Theory

“…Since the apodized FBG problem is difficult to calculate, for the sake of simplicity, many published results considered only the coupling between a forward core mode and a backward core mode [4][5][6]. In this paper we consider a total of 25 modes (1 core mode and 24 cladding modes) in CMEs (4)- (7).…”

“…Since apodized fiber Bragg gratings (FBGs) have superior filtering performance and high side lobe suppression, apodized FBGs have been widely developed and applied in optical fiber technology Various apodization profiles, such as Gaussian, positive hyperbolic-tangent, quadratic-sine etc. have been studied in literatures [4][5][6][7].…”

“…The piecewise-uniform approach (PUA) with transfer matrix method (TMM) is a commonly used numerical technique to simulate apodized grating structures by CMT [4][5][6][7]. For traditional PUA, the apodization profile of gratings is discretized into numerous uniform grating sections.…”

“…For traditional PUA, the apodization profile of gratings is discretized into numerous uniform grating sections. To reduce the complexity of the problem, a simplified CMT considers only the coupling between a forward core mode and a backward core mode [4][5][6]. In this study, the contra-directional coupling between core modes and cladding modes are considered [14].…”

Performance Investigation and Enhancement of Fiber Bragg Gratingfor Efficient Sensing Measurement

“…In opposition to the conventional electrical sensors, FBG sensors assure immunity to electromagnetic fields, and can be easily installed at low cost to measure important parameters such as strain, temperature, pressure, vibration, acceleration, bending, torsion, [2] [3]. The important feature of FBGS is that the sensed information is translated into a wavelength shift, giving reproducible measurements in spite of optical losses and intensity fluctuations.…”