Semi-Analytical Modeling of Distributed Phase-Shifts Applied on Chirped Fiber Bragg Gratings

Autor:	Sophie LaRochelle, Alexandre D. Simard
Rok vydání:	2012
Předmět:	Physics Optical fiber business.industry Physics::Optics Grating Band-stop filter Coupled mode theory Atomic and Molecular Physics and Optics law.invention Resonator Optics Band-pass filter Fiber Bragg grating law Optical filter business
Zdroj:	Journal of Lightwave Technology. 30:184-191
ISSN:	1558-2213 0733-8724
DOI:	10.1109/jlt.2011.2179790
Popis:	Tunable notch filters with multiple transmission lines have been proposed and demonstrated by temporarily inducing phase-shifts in chirped fiber Bragg gratings through the application of stress or thermal perturbations. These filters find application in many fields including microwave photonics or optical communications. So far, study of this type of filter has been mostly experimental with occasional numerical modeling based on coupled-mode theory. This paper presents a theoretical analysis using the WKB approximation that highlightens the presence of resonators and quantitatively describes both the phase-shift accumulated in the propagation region and the reflection strength of the surrounding grating regions. The model provides an approximated function of the transmission peak amplitude that gives good insight into its dependence on the grating parameters and perturbation profile. This analysis predicts the filter bandwidth, tuning capability and minimum spectral separation between two transmission lines leading to straightforward design and optimization of the filter parameters.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f1a4391281451700f9c95b807d8d43c0 https://doi.org/10.1109/jlt.2011.2179790 Zobrazit plný text záznamu