公开(公告)号：CA2420521A1

公开(公告)日：2004-08-27

申请号：CA2420521

申请日：2003-02-27

Applicant: TERAXION INC

Inventor： ROTHENBERG JOSHUA E

IPC: G02B5/18

Abstract: An apodized fiber Bragg grating, and a phase mask, method and system for making such a grating are disclosed. The refractive index profile of the grating has a periodic apodization phase component which is designed so that the grating fringes reflecting light in a spectral region of interest are apodized, by generating spurious reflection features outside of this spectral region of interest. Apodization is therefore provided through a phase variation of the grating as opposed to an amplitude variation. The phase component is added to the profile of the phase mask grating corrugations to obtain the phase-apodized grating.

公开(公告)号：CA2429092A1

公开(公告)日：2003-11-24

申请号：CA2429092

申请日：2003-05-20

Applicant: TERAXION INC

Inventor： ROTHENBERG JOSHUA E ,  POPELEK JAN

IPC: G02B6/02 ,  G02B5/18 ,  H04J14/02

Abstract: A phase mask, for writing fiber Bragg gratings (FBG) in an optical fiber, adjusts the amplitude and the phase of the FBG, while maintaining a constant mean index of refraction of the fiber in a single pass. Specifically, the phase mask embodies the amplitude information so that the amplitude information is an integral part of the pha se mask and preferably cannot be separated from the phase information. A first embodimen t employs a reflective or opaque surface, defining a window, on the substrate of a phase mask controlling the amplitude of light passing through the phase mask. Another embodiment employs a polygonal shaped grating region an a clear substrate. A third embodiment interleaves regions of grating and smooth substrate surface. Preferred embodiments employ two areas of gratings with the areas disposed: perpendicularly, out of bandwidth or out o f phase, relative to each other or additive.

公开(公告)号：CA2461527A1

公开(公告)日：2003-07-31

申请号：CA2461527

申请日：2003-01-22

Applicant: TERAXION INC

Inventor： ZWEIBACK JASON ,  LI HONGPU ,  WANG YING ,  ROTHENBERG JOSHUA E ,  SHENG YUNLONG

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/34 ,  G02B6/16

Abstract: The present invention is directed to a system and method for designing efficient multi-channel FBG gratings using a pre-compensated phase mask for diffracting light for side-writing the grating on an optical fiber core. A desired phase function of the FBG is generated, specifically tailored to an effective spacing between the phase mask and the optical fiber core. From th e phase function a phase mask is pre-compensated to offset diffraction effects associated with each longitudinal position of the FBG receiving light from t wo corresponding longitudinal positions of the phase mask substantially symmetrically spaced longitudinally relative to each particular longitudinal position of the FBG. The two corresponding longitudinal positions of the pha se mask are spaced longitudinally from each other by a spacing determined by th e effective spacing between the phase mask and fiber core and by the first ord er diffraction angle of light through the phase mask. The design involves Fouri er transformation and optimisation process steps for binory phase gratings.

公开(公告)号：CA2431234A1

公开(公告)日：2002-08-08

申请号：CA2431234

申请日：2002-01-04

Applicant: TERAXION INC

Inventor： ROTHENBERG JOSHUA E ,  SHENG YUNLONG

IPC: G03F1/34 ,  G02B6/16

Abstract: The invention provides masks (200) that form fiber Bragg gratings (FBGs) in optical fibers without stitching errors from re-scaling or re-positioning. T he invention feathers the pixels of the mask lines (201, 202, 203) by adding, removing, and/or displacing one or more pixels (204, 205, 206) from the edge s of the bars and spaces of the mask. The feathering of pixels will affect the FBG being written into the fiber. The feathering operates to shift the effective edge (207, 208) of the bars. This allows the achievement of much finer resolution FBGs than the pixel size of the mask.