Optical filter arrangement

Agencement de filtre optique

Abstract

L'invention porte sur un dispositif de filtre LiNo3 polarisé périodiquement (7, 8) qui a une paire d'électrodes (71, 72) pour commander la plage de transmission et une seconde paire d'électrodes (73, 74) pour commander l'amplitude d'un signal à bande étroite transmis (NBS). Un analyseur de polarisation rotatif (8) détermine le rapport du signal à bande étroite (NBS) et du signal de large bande (WMS). De plus, un ajusteur de polarisation (2-6) à l'entrée de l'agencement de filtre convertit les signaux reçus en signaux ayant la même polarisation linéaire.
A periodically poled LiNo3 filter device (7,8) has a first pair of electrodes (71, 72) to control the transmission range and a second pair of electrodes (73, 74) to control the amplitude of a transmitted narrow band signal (NBS). A rotatable polarisation analyser (8) determines the ratio of the narrow band signal (NBS) and the broadband signal (WMS). Further a polarisation adjuster (2-6) at the input of the filter arrangement converts received signals into signals having the same linear polarisation.

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Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    US-2004165808-A1August 26, 2004Institut National D'optiqueOptical repolarizing devices
    US-4678287-AJuly 07, 1987Gte Laboratories IncorporatedMethods of and apparatus for tuning a birefringent optical filter

NO-Patent Citations (2)

    Title
    GUOLIANG ZHENG ET AL: "Wave coupling theory of quasi-phase-matched linear electro-optic effect" OPTICS EXPRESS, OSA (OPTICAL SOCIETY OF AMERICA), WASHINGTON DC, (US), vol. 14, no. 12, 1 June 2006 (2006-06-01), pages 5535-5540, XP009123747 ISSN: 1094-4087
    ZHENG G ET AL: "Fast and wide-range continuously tunable Solc-type filter based on periodically poled LiNbO3" APPLIED PHYSICS B ; LASERS AND OPTICS, SPRINGER, BERLIN, DE, vol. 88, no. 4, 7 July 2007 (2007-07-07), pages 545-549, XP019540573 ISSN: 1432-0649 cited in the application

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