Fiber-integrated microlenses and optical fiber fbg couplers...

G - Physics – 02 – B

Patent

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G02B 6/10 (2006.01) G02B 6/293 (2006.01) G02B 6/32 (2006.01) G02B 6/34 (2006.01) G01J 3/18 (2006.01)

Patent

CA 2282519

A microlens is formed on the outer surface of an optical fiber having an in-fiber Bragg grating (FBG) formed in the core thereof, to focus light diffracted by the FBG onto other fibers or optical devices, or to focus light received at the fiber onto the FBG. Various single- and multi-microlens configurations of one or more fibers perform a variety of functions such as signal coupling, multiplexing, signal splitting, spectrography, tapped delay, timed-delay phase adjusting, circulating storage, and so forth. The microlenses may employ angle-increasing prisms and may comprise Fresnel lenses.

Selon l'invention, une microlentille (30) est montée sur la surface extérieure d'une fibre optique (20) présentant un réseau de Bragg (23) formé dans le coeur (21) de la fibre, pour focaliser la lumière diffractée par le réseau de Bragg (23), sur d'autres fibres ou des dispositifs optiques, ou bien pour focaliser la lumière reçue au niveau de la fibre (20), sur le réseau de Bragg (23). De nombreuses configurations comprenant une ou plusieurs microlentilles (30, 68), avec une ou plusieurs fibres (20), remplissent différentes fonctions telles que couplage de signaux, séparation de signaux, spectrographie, lignes à retard à prises, réglage en phase par temporisation, mémoire à circulation, etc. Les microlentilles peuvent utiliser des prismes à grossissement angulaire et comprendre des lentilles de Fresnel.

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