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Theses

Contribution à l'étude des amplificateurs distribués
et des circuits de polarisation active. Applications
aux circuits de commande de modulateurs électro-optiques

Abstract : The increase of data rates in optical telecommunication systems to 10Gbps and
40Gbps, particularly for distances in excess of 150 km, favours the use of external
modulation, and in particular electro optical modulators. The driver circuit of these
modulators thus become a key component of fiber optic transmission systems.
The first chapters of this thesis present a description of the most common systems and
architectures used, allowing us thereby to define performance specifications for the external
modulator driver circuits, and in particular electro optical drivers. Distributed amplifiers fulfil
these requirements well, due in particular to their high gain bandwidth product and a detailed
study of distributed amplifiers and their various configurations is carried out. The designed
amplifiers were produced based on a 0.15 μm PHEMT gallium arsenide technology.
In order to simplify the packaging and to solve the problems caused by the classical
distributed amplifier's biasing, two novel integrated biasing circuits were developed. First of
all, a novel active load, taking place of termination of the output line of the distributed
amplifier, was designed to bias the amplifier and makes it possible to preserve the output
matching during the variation in the current bias, for a gain control for example. Also an
integrated device composed of current sources connected to the output line of the distributed
amplifier, called an active bias T, is studied. The realization of an optical modulator driver, by
packaging a distributed amplifier using the active bias T, has been validated by scattering
parameter measurements and, electrical and optical eye diagrams.
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Submitted on : Friday, April 27, 2007 - 3:57:28 PM
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  • HAL Id : tel-00143887, version 1

Citation

Régis Claveau. Contribution à l'étude des amplificateurs distribués
et des circuits de polarisation active. Applications
aux circuits de commande de modulateurs électro-optiques. Micro et nanotechnologies/Microélectronique. INSA de Rennes, 2005. Français. ⟨tel-00143887⟩

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