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    OPTICAL GRATING
    12.
    发明公开
    OPTICAL GRATING 失效
    光晶格中

    公开(公告)号：EP0749587A4

    公开(公告)日：1997-06-04

    申请号：EP95908832

    申请日：1995-02-14

    Applicant: UNIV SYDNEY

    Inventor： CANNING JOHN ,  SCEATS MARK

    IPC: G02B6/13 ,  G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B27/44 ,  G02B6/18

    CPC classification number: G02B6/02152 ,  G02B6/02085 ,  G02B6/02133 ,  G02B6/02138 ,  G02B6/02185 ,  Y10S430/146

    Abstract: An optical grating is formed by exposing linearly spaced regions of an optical fibre (10), typically a germanosilicate core fibre, to UV irradiation to produce spaced apart regions (12 and 13) of differing refractive index within the core (11) of the fibre. The grating characteristics are modified to create a relatively complex structure, for example a ( PI phase-shifted distributed phase structure, by post-processing the grating. This is achieved by exposing at least one concomitant region (14) of the grating to localised UV irradiation.

    AN ABSORBING LAYER FOR MINIMISING SUBSTRATE EXPOSURE DURING THE UV WRITING OF A WAVEGUIDE GRATING IN ADDITION TO A BIREFRINGENT CONTROL SYSTEM
    17.
    发明专利
    AN ABSORBING LAYER FOR MINIMISING SUBSTRATE EXPOSURE DURING THE UV WRITING OF A WAVEGUIDE GRATING IN ADDITION TO A BIREFRINGENT CONTROL SYSTEM 未知

    公开(公告)号：CA2332524A1

    公开(公告)日：1999-12-09

    申请号：CA2332524

    申请日：1999-06-04

    Applicant: UNIV SYDNEY

    Inventor： CANNING JOHN

    IPC: G02B6/124 ,  G02B6/13 ,  G02B6/10 ,  G02B6/12 ,  G02B6/122

    Abstract: A waveguide having photosensitive properties is disclosed comprising: a waveguide substrate (2); a first cladding layer formed on the waveguide substrate; a UV absorbing layer (9) formed on the first cladding layer; a UV sensitive layer (4) having optical transmission properties adapted to be changed with UV irradiation, the layer formed on or closely adjacent the UV absorbing layer; and a second cladding layer, being substantially UV transparent, on the UV sensitive layer. Preferably, there is further provided a third cladding layer intermediate of the UV absorbing layer and the UV sensitive layer. The UV absorbing layer comprises a germanosilicate material. The absorbing layer can be adapted to change a physical property upon UV absorption. The UV absorbing layer can be variable thickness, the thickness being in accordance with predetermined requirements.

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