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US 6,674,927 B2Granted
Optical modulator with reduced deterioration of optical waveform in high frequency band
AssigneeFujitsu Limited
InventorSadao Ibukuro
Life of this patent
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Abstract
In an optical modulator having an electric waveguide and an optical waveguide, a filter converts a modulating signal into a signal equalizing a frequency characteristic of an acting amount to be provided to the electric waveguide. Also, the filter approximates the frequency characteristic of the acting amount caused by a skin effect in the electric waveguide.
Claims10
An optical modulator comprising:
- an optical waveguide to propagate a lightwave;
- an electric waveguide to provide an acting amount, to the optical waveguide, to modulate the lightwave by a modulating signal;
- and
- a filter to convert the modulating signal into a signal approximating a frequency characteristic of the acting amount to be provided to the electric waveguide,
- wherein the filter is placed between a source of the modulating signal and the electric waveguide in compensation for an attenuation of the modulating signal in the high frequency area caused by the acting current.
2 more elements
An optical modulator comprising:
- an optical waveguide to propagate a lightwave;
- an electric waveguide to provide an acting amount, to the optical waveguide, to modulate the lightwave by a modulating signal;
- and
- a filter to improve in a high frequency area of a frequency characteristic the acting amount to be provided to the electric waveguide,
- wherein the filter is placed between a source of the modulating signal and the electric waveguide in compensation for an attenuation of the modulating signal in the high frequency area caused by the acting amount.
2 more elements
Dependencies are inferred from the claim text.