Codes with ideal in-phase cross correlation (CC) are required in spectral-amplitude-coding optical code-division multiple-access (CDMA) systems since these codes eliminate multiuser interference and also suppress the effect of phase-induced intensity noise. However, little research work has been done on such codes although codes with ideal CC have been studied for many years. In a paper by Zhou
Zou Wei and H. Ghafouri-Shiraz, "Codes for Spectral-Amplitude-Coding Optical CDMA Systems," J. Lightwave Technol. 20, 1284- (2002)
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