Method and apparatus for providing tunable chromatic dispersion slope compensation
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United States of America Patent
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Issued Date -
May 27, 2004
app pub date -
Nov 26, 2002
filing date -
Nov 26, 2002
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Abandoned
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Abstract
A tunable high-order chromatic dispersion compensation arrangement compensates for dispersion slope in an optical signal transmitted in optical fibers. A pair of parallel diffractive gratings is used to disperse wavelength channels into separate but parallel beams, a novel dispersive element based-on all-optical all-pass filter technology is used to apply required dispersion to different wavelength channels. A novel beam imaging arrangement based on diffractive grating is used to modify the beam width across the dispersive element such that dispersion slope or wavelength-dependent dispersion can be adjusted. Since the tuning mechanism is independent of material properties such as dispersion characteristics of the dispersive element, the resulting tunable dispersion slope compensator is highly reliable to manufacturing tolerance, environmental degradations, and can be massively produced.
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