Patent ID: 8526819

Claim:
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.