Patent ID: 7773881

Claim:
An optical division multiplexing transmission and reception method, comprising: a transmission step and a reception step, wherein said transmission step comprises, in parallel, an optical code division multiplexing signal generation step that comprises an encoding step that generates an encoded optical pulse signal by encoding an optical pulse signal of each channel by allocating a different time-spreading/wavelength-hopping code to each channel and a time waveform shaping step that generates a shaped and encoded optical pulse signal by shaping the time waveform of said encoded optical pulse signal; and an optical wavelength division multiplexing signal generation step that generates an optical wavelength division multiplexing signal by allocating a different wavelength to each channel, and said transmission step further comprises: a multiplexing step that generates an optical division multiplexing signal by multiplexing said shaped and encoded optical pulse signal and said optical wavelength division multiplexing signal, and wherein said reception step comprises, in parallel, a de-multiplexing step that divides said optical division multiplexing signal into an optical code division multiplexing reception signal and an optical wavelength division multiplexing reception signal; an optical code division multiplexing signal extraction step that comprises a decoding step that generates a decoded optical code division multiplexing reception signal by decoding said optical code division multiplexing reception signal by using the same code as said time-spreading/wavelength-hopping code for each of said channels, a time waveform restoration step that generates a reproduced optical pulse signal by restoring the shaped optical pulse signal component contained in said decoded optical code division multiplexing reception signal, and a first threshold value judging step for extracting only the autocorrelation waveform component of said optical pulse signal from said reproduced optical pulse signal; and an optical wavelength division multiplexing signal extraction step that comprises a wavelength division step that generates an optical wavelength division signal for each channel by wavelength-dividing said optical wavelength division multiplexing reception signal and a second threshold value judging step that extracts an optical wavelength division multiplexing signal by performing a threshold value judgment on said optical wavelength division signal.