Patent ID: 7174103

Claim:
An optical signal converter for use in optical code division multiplexing based on a binary phase optical code, comprising: a grating waveguide having an identical number of uniform pitch gratings to the number of code chips of the binary phase optical code, said uniform pitch gratings being formed in a waveguide direction to reflect light of a predetermined wavelength, wherein adjacent uniform pitch gratings corresponding to a position at which the optical code value changes are disposed a spacing apart from each other to give a phase shift of (2m+1)Ï€/2 (â€œmâ€ is an integer) to the light of the predetermined wavelength, and the remaining adjacent uniform pitch gratings are disposed a spacing apart from each other to give a phase shift of nÏ€ (â€œnâ€ is an integer) to the light of the predetermined wavelength.