Method and apparatus for extracting light from an optical...

G - Physics – 02 – B

Patent

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G02B 6/26 (2006.01) G02B 6/02 (2006.01) G02B 6/10 (2006.01)

Patent

CA 2599519

Apparatus for extracting light from an optical waveguide (12) by bending the waveguide to such an extent that a portion of any light propagating in the waveguide leaks therefrom comprises a bending unit (10) for bending a portion of the waveguide in dependence upon a control signal (S) and providing a detection signal (Pa) proportional to light leaked from the waveguide. A control unit (14) varies the control signal (S) in response to the detection signal (Pa) to cause the bending unit (10) to progressively decrease the bending angle and has a processor unit (46) which computes a rate of change (dPa /dR) of the detection signal (Pa) with respect to bending radius (R) and causes the bending unit to maintain that bending radius at which the aforesaid rate of change is substantially equal to a predetermined value.

L'invention concerne un appareil conçu pour extraire la lumière d'un guide d'onde (12) optique par flexion du guide d'onde jusqu'à ce qu'une partie d'une lumière se propageant dans le guide d'onde fuit de ce dernier. L'appareil comprend une unité de flexion (10) destinée à plier une partie du guide d'onde en fonction d'un signal de commande (S) et à produire un signal de détection (Pd) proportionnel à la lumière fuyant le guide d'onde. Une unité de commande (14) fait varier le signal de commande (S) en réponse au signal de détection (Pd) afin d'amener l'unité de flexion (10) à diminuer progressivement l'angle de flexion et est équipé d'un processeur (46) qui calcule une vitesse de changement (dPd/dR) du signal de détection (Pd) par rapport au rayon de flexion (R) et amène l'unité de flexion à conserver ce rayon auquel ladite vitesse de changement est sensiblement égale à une valeur prédéterminée.

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