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US 2006/0067699 A1Published application
Equalizer having tunable optical and electronic dispersion compensation
OwnerSethumadhavan Chandrasekhar, Chritopher Doerrinventors
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Abstract
A method of and apparatus for optical signal dispersion compensation uses tunable optical (ODC) and electronic (EDC) dispersion compensation. The ODC provides significant first-order dispersion compensation, but leaves significant high-order dispersion and transmissivity ripple effects. The EDC is used to provide compensation for the high-order dispersion and transmissivity ripple from the ODC.
Claims11
A dispersion compensator comprising
- a tunable optical dispersion compensator, ODC, responsive to a first control signal for compensating primarily first-order optical dispersion in a received optical signal;
- an optical signal detector for detecting the ODC compensated received optical signal and for generating an electrical signal;
- an adaptive electronic dispersion compensator, EDC, responsive to one or more control signals for compensating higher-order optical dispersion and/or optical transmissivity ripple effects in the electrical signal;
- an electrical signal detector for detecting an electrical signal from the EDC and for generating a quality signal that indicates the quality of the received signal;
- and
- a controller responsive to the quality signal for generating the first control signal for controlling first-order dispersion compensation by the ODC and for generating the one or more control signals for controlling higher-order dispersion compensation and/or transmissivity ripple by the EDC so as to reduce overall dispersion in the received optical signal.
3 more elements
An intersymbol interference (ISI) mitigator comprising
- a narrow-band tunable ISI optical equalizer, OEQ, responsive to a first control signal for compensating for first-order distortions in a received optical signal;
- an optical signal detector for detecting the OEQ compensated received optical signal and for generating an electrical signal;
- an adaptive ISI electronic equalizer, EEQ, responsive to a second control signal for equalizing the electrical signal so as to compensate for higher-order distortions in the received optical signal;
- an electrical signal detector for detecting an electrical signal from the EEQ and for generating a quality signal that indicates the quality of the received signal;
- and
- a controller responsive to the quality signal for generating the first control signal for controlling first-order distortion compensation in the OEQ and for generating the second control signal for controlling higher-order distortion compensation in the EEQ so as to reduce overall distortion in the received optical signal.
3 more elements
A method of providing optical signal dispersion compensation, the method comprising the steps of:
- using a tunable optical dispersion compensator, ODC, compensating primarily for first-order dispersion in a received optical signal;
- detecting the compensated received optical signal and generating an electrical signal therefrom;
- using adaptive electronic dispersion compensator, EDC, compensating for higher-order optical dispersion and/or optical transmissivity ripple effects in the electrical signal;
- detecting an electrical signal from the EDC and for generating a quality signal that indicates the quality of the received signal;
- and
- in response to the quality signal, controlling first-order dispersion compensation by the ODC and controlling higher-order dispersion compensation and/or transmissivity ripple by the EDC so as to reduce overall dispersion in the received optical signal.
3 more elements
Dependencies are inferred from the claim text.