Optical orthogonal frequency division multiple multiplexing receiver and optical signal receiving method thereof

Abstract

Provided is an optical OFDM receiver. The optical OFDM receiver receives an optical signal dependent on the nonlinearity of a transmitter. The optical OFDM receives includes an optical down converter, a nonlinearity compensator, and an OFDM demodulator. The optical down converter converts the optical signal into an electrical signal. The nonlinearity compensator filters the electrical signal, for compensating distortion which is added to the optical signal when the transmitter performs optical modulation. The OFDM demodulator demodulates the distortion-compensated electrical signal in an OFDM scheme.

What is claimed is: 
     
         1 . An optical Orthogonal Frequency Division Multiplexing (OFDM) receiver which receives an optical signal dependent on a nonlinearity of a transmitter, the optical OFDM receiver comprising:
 an optical down converter converting the optical signal into an electrical signal;   a nonlinearity compensator filtering the electrical signal, for compensating distortion which is added to the optical signal when the transmitter performs optical modulation; and   an OFDM demodulator demodulating the distortion-compensated electrical signal in an OFDM scheme;   wherein the distortion is caused by a nonlinearity of an optical modulator which is comprised in the transmitter;   wherein the nonlinearity compensator comprises:
 an A/D converter converting the electrical signal into a digital signal; and 
 a digital filter compensating distortion, which is caused by the nonlinearity, from the digital signal. 
   
     
     
         2 . A reception method in an optical Orthogonal Frequency Division Multiplexing (OFDM) receiver which receives an optical signal dependent on a nonlinearity of a transmitter, the reception method comprising:
 receiving the optical signal to convert the optical signal into an electrical signal;   compensating distortion, which is caused by a nonlinearity of an optical modulator in the transmitter, from the electrical signal; and   demodulating the distortion-compensated signal in an OFDM scheme;   wherein the compensating of distortion comprises:
 converting the electrical signal being an analog signal into a digital signal; and 
 compensating distortion, which is caused by the nonlinearity, from the digital signal. 
   
     
     
         3 . The reception method of  claim 2 , wherein the converting of the electrical signal comprises a uniform quantization operation which maps the electrical signal at a uniform quantization level.