Patent ID: 7439485

Claim:
A multimode optical transmission apparatus for converting an inputted electrical signal into an optical signal and transmitting the optical signal via a multimode optical transmission medium, the multimode optical transmission apparatus comprising: a signal output section for outputting a predetermined signal in accordance with the inputted electrical signal; a control section for causing the signal output section to adjust a frequency component of the predetermined signal; and an electric-optic conversion section for converting the predetermined signal into an optical signal and transmitting the optical signal via the multimode optical transmission medium, wherein the signal output section includes: a modulation section for modulating the inputted electrical signal and outputting the modulated signal as a high frequency modulated signal; a superimposed signal generation section for generating a signal having a predetermined frequency and outputting the generated signal as a superimposed signal; and a multiplexer section for frequency-multiplexing the superimposed signal with the high frequency modulated signal outputted by the modulation section, and outputting the frequency-multiplexed signal as the predetermined signal, and wherein the control section adjusts a frequency of the superimposed signal outputted by the superimposed signal generation section using the group delay information of each mode of propagation which propagates in the multimode optical transmission medium.