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Polarization mode dispersion emulation

  • US 6,381,385 B1
  • Filed: 12/22/1999
  • Issued: 04/30/2002
  • Est. Priority Date: 12/22/1999
  • Status: Expired due to Fees
First Claim
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1. A method of emulating the first and second order PMD (polarisation mode dispersion) properties of a length of low birefringence optical fibre installed in the field, in which method light is caused to propagate through a concatenation of n lengths of high birefringence optical waveguide, each having two guided modes, respectively a fast mode and a slow mode, and each length presenting a different value of differential group delay, τ

  • r, for light propagating in those modes, where r is a positive integer between 1 and n, wherein the rth length of the concatenation is optically coupled with the (r+1)th length in a manner providing cross coupling of the modes so that only cos2 θ

    r of the power propagating in each mode (fast or slow) of the rth length is launched into the same mode (fast or slow) of the (r+1)th length while the remaining sin2 θ

    r of the power is launched into the opposite mode (slow or fast), wherein the values of θ

    r for r=1 to r=(n−

    1) have a substantially random distribution within the range 0 to π

    /2, and wherein said lengths and their differential group delays satisfy the following five criteria (i) to (v);

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