Two-stage optical bi-directional transceiver

Details Two-stage optical bi-directional transceiver Two-stage optical bi-directional transceiver

H - Electricity

04

J

H04J 14/02 (2006.01) G02B 5/18 (2006.01) G02B 6/293 (2006.01) H04B 10/13 (2006.01)

Patent

CA 2565709

The invention relates to a planar lightwave circuit including a two stage optical filter for use in a bi-directional transceiver. A first stage includes a non-dispersive optical filter, which enables light within in a certain wavelength range, e.g. a signal channel from a laser source, to be launched onto an input/output waveguide, while light within another wavelength range, e.g. one or more detector channels, will be directed from the input/output waveguide to a second stage. The second stage includes a reflective diffraction grating with a higher resolution than the first stage providing passbands 2 to 5 times thinner than the first stage.

L~invention concerne un circuit plan d~onde de lumière incluant un filtre optique à deux étages à utiliser dans un transmetteur/récepteur bidirectionnel. Un premier étage comprend un filtre optique non-dispersant qui autorise la lumière d~une certaine plage de longueurs d~onde, en l~occurrence un canal signal d~une source laser, à être projetée sur un guide d~onde d~entrée/sortie, alors que de la lumière d~une autre plage de longueurs d~onde, en l~occurrence un ou plusieurs canaux de détecteur, sera dirigée du guide d~onde d~entrée/sortie vers un deuxième étage. Le deuxième étage comprend un réseau de diffraction réfléchissant ayant une résolution supérieure au premier étage, fournissant une bande passante de 2 à 5 fois plus étroite que le premier étage.

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