Provided is a multimode optical transmission system capable of reducing an
influence of multimode dispersion occurring when an optical signal is
transmitted in multimode. Light sources (101 to 10m) respectively convert
inputted electrical signals into a plurality of optical signals
respectively having different wavelengths, and respectively output the
plurality of optical signals. A wavelength multiplexing section (200)
performs wavelength multiplexing of the plurality of optical signals
outputted from the light sources (101 to 10m), and outputs a resultant
signal as a wavelength multiplexed signal. A multimode optical
transmission path (300) optically transmits the wavelength multiplexed
signal in multimode. A mode processing section (400) extracts, from the
wavelength multiplexed signal transmitted through the multimode optical
transmission path (300), a plurality of optical signals each being in a
mode having a particular wavelength and a particular propagation
constant. Optical receiving sections (501 to 50m) receive the plurality
of optical signals having been extracted, and convert the received
optical signals into electrical signals.