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Theses

Etude de cavités optiques formées de miroirs de Bragg à réseaux à pas variable : application aux filtres et lasers.

Abstract : The aim of this thesis is focused on the study of an extended cavity laser or/and optical filter, whose external mirror is the linearly chirped Bragg grating. As for the gain medium in the resonant, SOA (Semiconductor Optical Amplifier) can act as optical gain device. It can offer all of the classic and typical characteristics and advantages like large spectral passband of 50 nm, low power consumption, high-speed electro-optical commutation and so on. Therefore, this type of laser or/and optical filter have many interesting applications in the field of optical telecommunications.In this research, the first works are the design of passive continuum resonant cavity using linearly chirped Bragg grating. Inside this so-called continuum cavity, formed between mirror and chirped grating, all of the Bragg wavelengths oscillate at the same time, so the round-trip phase of each oscillated wavelength should keep constant. Then there is a passband spectrum at the transmission side. The bandwidth of transmission could be varied in C band (from 1525 nm to 1565 nm) to satisfy the needs of wavelength-division multiplexing (WDM) systems. This project is separated by two cases, one is about the external cavity applying chirped fiber Bragg grating as an external mirror, and the other is about the integrated cavity on InP chip, where the Bragg grating is already lithographed. Anyway, the first works of the thesis consist of numerical modeling, computational simulations and experimental manipulations.During the second works, the first step we add SOA as gain medium between two chirped fiber Bragg gratings for the purpose of generating laser. There are reflectors and active part in the passive cavity, so there is lasing far and away. It emits the typical F-P multimode light at the intersection of SOA gain band and reflection band of chirped grating. Then the second step is that a seed laser, whose frequency is nearby one of the longitudinal modes, is injected into the cavity in order to lock this mode. So there is only one emitted laser mode because of injection locking. This lasing resonant cavity could also be formed between mirror and linearly chirped Bragg grating.
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  • HAL Id : tel-00817846, version 1

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Xunqi Wu. Etude de cavités optiques formées de miroirs de Bragg à réseaux à pas variable : application aux filtres et lasers.. Autre. Supélec, 2012. Français. ⟨NNT : 2012SUPL0001⟩. ⟨tel-00817846⟩

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