Patent ID: 7769301

Claim:
An optical code division multiplexing receiving device that receives and decodes optical code division multiplexed signals encoded by a time-spreading wavelength-hopping method, comprising: a decoding portion for generating decoded signals from the optical code division multiplexed signals and encoded signals in an encoded state from the optical code division multiplexed signals; a clock extraction circuit, including a first clock signal generation portion, said first clock signal generation portion generating first clock signals from first encoded signals resulting from dual-dividing of said encoded signals, and a second clock signal generation portion extracting optical pulses synchronized with said first clock signals from second encoded signals resulting from said dual-dividing of said encoded signals, and generating second clock signals from the extracted optical pulses, said second clock signal generation portion being configured by connecting, in order, an intensity modulator for receiving as input signals said second encoded signals, a 2R receiver, a clock recovery circuit, and a second variable delay for outputting said second clock signals; and, a time gate processor for performing time gate processing on said decoded signals using said second clock signals as gate signals to output said decoded signals as received signals.