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Bragg grating monitoring and correction during the manufacture of Bragg grating

A Bragg grating, writing-period technique, applied in diffraction gratings, optical waveguides, optics, etc.

Inactive Publication Date: 2005-09-21
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] More generally, any filter response will be negatively affected by the presence of errors in the manufacturing process

Method used

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  • Bragg grating monitoring and correction during the manufacture of Bragg grating
  • Bragg grating monitoring and correction during the manufacture of Bragg grating
  • Bragg grating monitoring and correction during the manufacture of Bragg grating

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Embodiment Construction

[0017] as per figure 1 In one embodiment shown, the phase correction process includes shifting the interference pattern that illuminates the waveguide 14 as the ultraviolet write beam U scans along the waveguide 14 . The ultraviolet writing beam U exposes the phase mask 12 . In one embodiment, the ultraviolet writing beam U may be scanned along the length of the mask 12 as indicated by arrow A. As shown in FIG. exist figure 1 At the position of the writing beam U shown, a grating 16 is formed in the waveguide 14 . The waveguide 14 may be an optical fiber, or may be a planar waveguide, as two examples.

[0018] The phase correction process may be accomplished by making small adjustments to the relative position of one or more phase gratings (e.g., masks) 12 relative to waveguide 14 that are used to generate the interference pattern as the write beam U scans along waveguide 14, as indicated by arrows B, while achieving the correct shift of the interference pattern. The magn...

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PUM

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Abstract

In accordance with some embodiments of the present invention, while a Bragg grating (16) is being written in a substrate (14), measurements may be taken to allow changes to be made in the writing process to reduce errors that may occur in the written grating (16). In one embodiment, multiple scans of the writing beam (U) can be used. After a scan, measurements of the characteristics of the grating (16) being written can be taken and corrections may be implemented on subsequent scans.

Description

technical field [0001] The present invention relates to a process for correcting phase errors during the manufacture of Bragg gratings. Background technique [0002] Bragg gratings in optical waveguides (optical fibers and planar waveguides) are used for a variety of optical processing functions. The most common application is simple wavelength filtering in dense wavelength division multiplexing (DWDM) systems. [0003] In such applications, an ideal Bragg grating filter has a spectral response that is rectangular in shape with steep edges and a flat top. Typically, any phase or magnitude errors in the manufacturing process result in a non-ideal spectral response. [0004] Also, as the DWDM channel spacing becomes smaller, the filter bandwidth must be reduced by the same amount. The reduced bandwidth requires an increase in Bragg grating length. These requirements lead to a greatly increased sensitivity of the filter spectral quality to any errors in the manufacturing pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/00G02B5/18G02B6/02G02B6/122G02B6/124
CPCG02B6/124G02B6/02138G02B6/02171
Inventor J·N·斯维特塞尔A·格伦内特-耶普森
Owner INTEL CORP