Amplitude tunable filter

G - Physics – 02 – B

Patent

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Details

G02B 6/26 (2006.01) G02B 6/34 (2006.01) G02F 1/01 (2006.01)

Patent

CA 2372905

A dynamically tunable filter (10) controls the magnitude of couplings between core (16) and cladding (18) modes of a waveguide by surrounding the waveguide with an overcladding (20) having an adjustable refractive index. The coupled modes are attenuated along the core to produce the desired spectral response. The adjustment to the overcladding (20) index is made in a range that is above the refractive index of the underlying cladding (18) to vary amplitudes of attenuated bands of wavelengths without shifting central wavelengths of the bands.

L'invention concerne un filtre (10) pouvant être réglé de façon dynamique, qui permet de commander l'intensité des couplages entre des modes lié (16) et de gaine (18) d'un guide d'ondes grâce à un gainage du guide d'ondes à l'aide d'une gaine (20) supplémentaire présentant un indice de réfraction réglable. Les modes couplés sont atténués le long du coeur pour produire la réponse spectrale voulue. Le réglage de l'indice de la gaine (20) supplémentaire est effectué dans une plage supérieure à celle de l'indice de réfraction de la gaine (18) sous-jacente afin de faire varier les amplitudes des bandes atténuées de longueurs d'onde sans décaler les longueurs d'onde centrales des bandes.

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