Design and analysis of a dynamic spectral encoding code-division multiple-access communication system

Hossam M. H. Shalaby University of Alexandria Department of Electrical Engineering Abstract. An optical dynamic spectral encoding code division multiple access CDMA communication system is proposed. In this system, an electrically controlled tunable optical filter TOF is used to encode the modulated broadband light source. The code depends on the function set to the controller. Two-dimensional code, named functional code, is also proposed based on a shifted sine function. The function defines the dynamic coding pattern of the central wavelength of the transmitted narrowband optical signal. Thus, the system will allow for an easy reconfiguration of the transmitter without the need for a sophisticated encoder. At the receiver, a synchronized TOF with the same function is used as a decoder. The system is modeled and analyzed taking into account the multiple access interference, phase-induced intensity noise PIIN , and thermal noise. The performance of this system is shown to be better compared with a fast frequency hopping FFH system and a spectral amplitude coding SAC system that uses either a Hadamard code, a modified quadratic congruence MQC code, or a modified frequency hopping MFH code. © 2006 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.2359455