| 摘要 |
PROBLEM TO BE SOLVED: To enable compensation, even if a large frequency offset occurs, by detecting the frequency offset.SOLUTION: A transmitter generates an OFDM optical signal into which continuous light with a transmission side reference frequency fwas modulated by an OFDM electric signal and a continuous optical signal with the transmission side reference frequency fgenerated during an OFDM symbol period Tper training symbol period T, n times (n is an integer of 2 or more) an OFDM symbol period T, as a communication signal. A receiver generates an OFDM electric signal by performing optical-to-electrical conversion of an optical signal obtained by making continuous light with a reception side reference frequency fand the communication signal interfere with each other, and compensates the OFDM electric signal for a frequency offset determined according to the difference between the reception side reference frequency fand the transmission side reference frequency f. |
