Optical spectrum analyser

G - Physics – 01 – J

Patent

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Details

G01J 3/18 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2362874

An optical spectrum analyser (10), receiving a multi-channel optical signal (12). The optical signal (12) is passed through an optical isolator (14) and a fibre coupler (16) to a tuneable optical filter. The tuneable optical filter comprises one or more fibre Bragg gratings (18) inscribed in a length of optical fibre. The optical fibre is mounted on a means operable to apply a variable strain to the fibre, to thereby tune the peak wavelength of the Bragg grating (18) over a desired wavelength range, the tuneable optical filter thereby reflecting each channel of the input signal (12) in turn. The detector (20) therefore detects a signal only if the input signal (12) contains wavelengths corresponding to the reflection wavelength of a grating (18).

Cette invention concerne un analyseur de spectre optique (10) recevant un signal optique multi-canal (12). Le signal optique (12) traverse un isolateur optique (14) et un coupleur de fibre (16) vers un filtre optique accordable. Ce filtre accordable comprend un ou plusieurs réseaux de Bragg (18) inscrits dans une longueur de fibre optique. La fibre optique est montée sur un dispositif conçu pour soumettre ladite fibre à une déformation variable, ce qui permet d'accorder la longueur d'onde maxi du réseau de Bragg (18) sur la plage de longueur d'onde voulue. De ce fait, le filtre optique accordable reflète chacun des canaux du signal d'entrée (12) l'un à la fois. Dans ces conditions, le détecteur (20) ne détecte un signal que si le signal d'entrée renferme des longueurs d'onde correspondant à la longueur d'onde réflexion du réseau (18).

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