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Diffraction compensation of FBG phase masks for multi-channel sampling applications

  • US 6,654,521 B2
  • Filed: 01/23/2002
  • Issued: 11/25/2003
  • Est. Priority Date: 01/23/2002
  • Status: Expired due to Term
First Claim
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1. A method of designing a pre-compensated phase mask for side-writing a fiber Bragg grating (FBG) on an optical fiber core, said method comprising the steps of:

  • determining an effective spacing between said phase mask and said optical fiber core for said side-writing; and

    calculating a phase mask design, such that a desired FBG phase function is written on said fiber core by a pattern of light diffracting from said designed phase mask through said effective spacing, said designed phase mask being pre-compensated to offset diffraction effects associated with each longitudinal position on said FBG receiving light from two corresponding longitudinal positions on said phase mask, said two corresponding longitudinal positions on said phase mask being substantially symmetrically spaced longitudinally relative to each said longitudinal position on said FBG.

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