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US 8,526,819 B2Granted
Receiver, light spectrum shaping method, and optical communication system
AssigneeFujitsu Limited
InventorRyou Okabe
Life of this patent
Estimating the term…
Abstract
A receiver receiving a phase-modulated optical frequency division multiplexed signal is provided. The receiver includes a light spectrum shaper configured to extract a carrier wave and a modulated light component contained in either one of a short-wavelength-side waveband or a long-wavelength-side waveband with respect to the carrier wave, to output a spectrum-shaped light signal; and an optical-to-electric converter configured to convert the spectrum-shaped light signal into an electric signal.
Claims15
A receiver receiving a phase-modulated optical frequency division multiplexed signal, comprising:
- a light spectrum shaper configured to extract a carrier wave and a modulated light component contained in either one of a short-wavelength-side waveband or a long-wavelength-side waveband with respect to the carrier wave, to output a spectrum-shaped light signal;
- and
- an optical-to-electric converter configured to convert the spectrum-shaped light signal into an electric signal,
- wherein the light spectrum shaper is configured to extract a first specific portion of modulated light components contained in said one of the short-wavelength-side waveband and the long-wavelength-side waveband, together with the carrier wave,
- wherein the light spectrum shaper includes a fiber Bragg grating configured to remove a second specific portion of the modulated light components from another of the short-wavelength-side waveband and the long-wavelength-side waveband, the second specific portion corresponding to the first specific portion symmetrically with respect to the carrier wave;
- and
- wherein the optical-to-electric converter is configured to cancel out all the modulated light components except for the carrier wave and the first specific portion of the modulated light components contained in said one of the short-wavelength-side waveband and the long-wavelength-side waveband, from the spectrum-shaped light signal.
4 more elements
A light spectrum shaping method, comprising:
- receiving a phase-modulated optical frequency division multiplexed signal as an input light signal;
- extracting a carrier wave together with a modulated light component contained in either one of a short-wavelength-side waveband or a long-wavelength-side waveband with respect to the carrier wave to output a spectrum-shaped light signal,
- extracting a first specific portion of modulated light components contained in said one of the short-wavelength-side waveband and the long-wavelength-side waveband, together with the carrier wave,
- removing a second specific portion of the modulated light components from another of the short-wavelength-side waveband and the long-wavelength-side waveband, the second specific portion corresponding to the first specific portion symmetrically with respect to the carrier wave;
- and
- cancelling out all the modulated light components except for the carrier wave and the first specific portion of the modulated light components contained in said one of the short-wavelength-side waveband and the long-wavelength-side waveband, from the spectrum-shaped light signal.
3 more elements
An optical communication system comprising:
- an optical medium configured to transmit a phase-modulated optical frequency division multiplexed signal;
- and
- a receiver configured to receive the phase-modulated optical frequency division multiplexed signal through the optical medium,
- wherein the receiver extracts a carrier wave and a modulated light component contained in either one of a short-wavelength-side waveband or a long-wavelength-side waveband with respect to the carrier wave from the phase-modulated optical frequency division multiplexed signal, and converts the extracted light signal component into an electric signal,
- wherein the receiver has a light spectrum shaper configured to remove a first specific portion of the modulated light components contained in another of the short-wavelength-side waveband and the long-wavelength-side waveband from the phase-modulated optical frequency division multiplexed signal, and
- wherein the carrier wave and only a second specific potion of the modulated light components contained in said one of the short-wavelength-side waveband and the long-wavelength-side waveband are converted into the electric signal, while all other modulated light components are canceled out through the optical-to-electric conversion, the second specific portion corresponding to the first specific portion symmetrically with respect to the carrier wave.
3 more elements
Dependencies are inferred from the claim text.