Patent ID: 7324754

Claim:
An optical code division multiplex transmission method, comprising: an encoding step on the transmitting side using an encoder comprising a first Superstructured Fiber Bragg Grating (SSFBG); a decoding step on the receiving side using a decoder comprising a second SSFBG having a phase structure opposite that of the first SSFBG; and a phase adjustment step of adjusting the operating wavelength of the second SSFBG such that the extent of an eye opening of optical pulses output from the second SSFBG is maximum; wherein said phase adjustment step comprises: a step S 1 of acquiring a first data item reflecting the extent of the eye opening of optical pulses output from the second SSFBG comprised by said decoder; a step S 2 of displacing the operating wavelength of said second SSFBG to the short-wavelength side; a step S 3 of acquiring a second data item reflecting the extent of the eye opening of optical pulses output from said second SSFBG; a step S 4 of comparing said first data item and said second data item; a step S 5 of returning to said step S 2 if the extent of the eye opening corresponding to said first data item is smaller than or equal to the extent of the eye opening corresponding to said second data item, and of displacing the operating wavelength of said second SSFBG to the long-wavelength side if the extent of the eye opening corresponding to said first data item is larger than the extent of the eye opening corresponding to said second data item; a step S 6 of acquiring a third data item reflecting the extent of the eye opening of optical pulses output from said second SSFBG; a step S 7 of comparing said first data item and said third data item; and, a step S 8 of returning to said step S 5 if the extent of the eye opening corresponding to said first data item is larger than or equal to the extent of the eye opening corresponding to said third data item, and of interchanging said third data item and said first data item, and returning to said step S 2 , if the extent of the eye opening corresponding to said first data item is smaller than the extent of the eye opening corresponding to said third data item.