Patent ID: 7680415
Filing Date: 2010-03-16
Classification: H04J

Abstract:
1. An optical code division multiplexing transmission and reception method, comprising: an encoding step of encoding an optical pulse signal that is allocated to each channel and transmitted and contains light of distinct wavelengths in a number equal to the number of channels by using a time spreading/wavelength hopping code that is distinct for each channel to generate an encoded optical pulse signal; a decoding step of decoding said encoded optical pulse signal of each of the channels by using code that is the same as said time spreading/wavelength hopping code to generate a playback optical pulse signal that contains a auto-correlation waveform component and cross correlation waveform component of said optical pulse signal and of extracting only said auto-correlation waveform component, wherein said decoding step comprises: a playback optical pulse signal separation step of separating said playback optical pulse signal into a clock signal extraction signal comprising one wavelength component of the light contained in said optical pulse signal and an optical pulse signal playback signal comprising the remaining wavelength component; a clock signal extraction step of extracting a clock signal from said clock signal extraction signal; and a time gate processing step of removing only said auto-correlation waveform component from said optical pulse signal playback signal, wherein said playback optical pulse signal separation step uses a Bragg reflection characteristic to separate said playback optical pulse signal into a clock signal extraction signal that comprises one wavelength component of the light that is contained in said optical pulse signal, and an optical pulse signal playback signal that comprises said remaining wavelength component.