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Dispersion compensation with low polarization mode dispersion

  • US 5,974,206 A
  • Filed: 12/19/1997
  • Issued: 10/26/1999
  • Est. Priority Date: 12/19/1997
  • Status: Expired due to Term
First Claim
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1. A method of providing chromatic dispersion using Bragg reflection in polarisation maintaining optical waveguide, which method includes the steps of,separating an input optical signal into orthogonally polarised components,causing each separated component to make a forward passage through a non-reciprocal element,causing each component to suffer spatially distributed reflection as the result of being launched into an associated one of two polarisation maintaining optical waveguides, each to propagate in that associated waveguide with a polarisation state substantially aligned with a principal polarisation plane of that waveguide, that waveguide being provided with a chirped Bragg reflection grating the location and chirp of which is chosen, in relation to that of the Bragg grating of the other waveguide, such that each Bragg reflected wavelength of one separated component propagates in its associated waveguide for substantially the same time as the time the corresponding Bragg reflected wavelength of the other separated component propagates in its associated waveguide,causing each reflected component to make a return passage through the non-reciprocal element, andthen recombining the two components.

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