Patent ID: 7937000
Filing Date: 2011-05-03
Classification: H04B

Abstract:
1. An optical receiver for receiving a frequency-modulated signal light generated by frequency-modulating an input signal, the optical receiver comprising: an optical filter for limiting the frequency-modulated signal light to a predetermined frequency band and for converting the frequency-modulated signal light to an intensity-modulated signal light; the optical filter having a variable filtering wavelength; an optical waveguide having an input port, a first output port, and a second output port; the optical waveguide receiving the frequency-modulated signal light at the input port and transmitting the frequency-modulated signal light thus received toward the first output port and the second output port by way of the optical filter; a first photoelectric converter, provided at the first output port of the optical waveguide, for converting the frequency-modulated signal light or a first component of the intensity-modulated signal light to an electric signal; a second photoelectric converter, provided at the second output port of the optical waveguide, for converting a second component of the intensity-modulated signal light to an electric signal; and a controller for controlling the filtering wavelength of the optical filter based on the electric signal outputted from the first photoelectric converter and the electric signal outputted from the second photoelectric converter; wherein the input signal is regenerated based on the electric signal outputted from the second photoelectric converter.