Hybrid WDM and Optical CDMA Implemented with M-sequence Coded Waveguide Gratings over Fiber-to-the-Home Network
In the last-mile access network, the hybrid wavelength-division multiplexing and optical code-division multiple-access (WDM/OCDMA) scheme for Ethernet passive optical network (the so-called WDM/OCDMA-EPON) is presented over fiber-to-the-home (FTTH) network. In this study, since the FTTH network is characterized by various distance between optical network unit (ONU) and optical line terminal (OLT), the ONU capacity is divided into several groups. Each ONU group is assigned the maximal-length sequence (M-sequence) code which is popularly used for spectral amplitude coding in OCDMA network. By employing the inherent cyclic and free spectral range (FSR) periodic properties of arrayed-waveguide grating (AWG) router, the AWG coder/decoder (codec) is shared by all the ONUs divided various groups with FSR interval range (Δλf). Hence, the number of AWGs is significantly decreased. In addition, compared to the time division multiplexing and wavelength-division multiplexing EPON schemes, the proposed scheme is more flexible, scalable and confidential. The influence of degree of polarization (DOP) is investigated to evaluate the ratio of signal to phase-noise (SNRPIIN). By setting the depolarizer in front of balanced photo-detector, the system performance of simultaneous active ONUs is improved approximating 20％ compared to the average DOP of 0.5.
Jen-Fa Huang Yao-Tang Chang Chuan-Ching Sue Che-Chih Hsu
Institute of Computer and Communications, Department of Computer Science and Information Engineering Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan
国际会议
2006 International Conference on Communications,Circuits and Systems(第四届国际通信、电路与系统学术会议)
广西桂林
英文
1860-1864
2006-06-25（万方平台首次上网日期，不代表论文的发表时间）