Integrated optical dual dispersion compensator for compensating both chromatic and polarization mode dispersion
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United States of America Patent
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Jun 8, 2004
Grant Date -
Oct 30, 2003
app pub date -
Apr 24, 2002
filing date -
Apr 24, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In accordance with the invention, an optical data transmission system is provided with an integrated dual dispersion compensator that can compensate both chromatic dispersion and PMD. The compensator comprises in essence, a substrate-supported planar waveguide structure having a planar transmission waveguide coupled to an integrated chromatic dispersion compensator and to an integrated PMD compensator. The chromatic dispersion compensator is advantageously a length of waveguide coupled to an all-pass filter. The PMD compensator is advantageously a polarization separator for separating the two polarization components between two waveguide subpaths and at least one delay element coupled to at least one subpath to compensate propagation delays. The subpath beams can then be combined to an optical signal compensated for both chromatic dispersion and PMD. In a preferred embodiment the chromatic dispersion compensator and the delay element are both tunable.
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