Min Feng,Qing-long Luo,Cheng-lin Bai.Colorless ONU implementation for WDM-PON using direct-detection optical OFDM[J].Optoelectronics Letters,2013,9(2):135-138 Colorless ONU implementation for WDM-PON using direct-detection optical OFDM Author Name Affiliation E-mail Min Feng  College of Physics Science and Information Engineering, Liaocheng University, Liaocheng, 252059, China Key Laboratory of Optical Communications Science & Technology of Shandong Province, Liaocheng University, Liao-cheng, 252059, China    Qing-long Luo  College of Physics Science and Information Engineering, Liaocheng University, Liaocheng, 252059, China Key Laboratory of Optical Communications Science & Technology of Shandong Province, Liaocheng University, Liao-cheng, 252059, China    Cheng-lin Bai  College of Physics Science and Information Engineering, Liaocheng University, Liaocheng, 252059, China Key Laboratory of Optical Communications Science & Technology of Shandong Province, Liaocheng University, Liao-cheng, 252059, China  baichenglin@lcu.edu.cn  Abstract:       A novel architecture for the colorless optical network unit (ONU) is proposed and experimentally demonstrated with direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM). In this architecture, polarization-division multiplexing is used to reduce the cost at ONU. In optical line terminal (OLT), quadrature amplitude modulation (QAM) intensity-modulated OFDM signal with x-polarization at 10 Gbit/s is transmitted as downstream. At each ONU, the optical OFDM signal is demodulated with direct detection, and γ-polarization signal is modulated for upstream on-off keying (OOK) data at 5 Gbit/s. Simulation results show that the power penalty is negligible for both optical OFDM downstream and the on-off keying upstream signals after over 50 km single-mode fiber (SMF) transmission. Hits: 4147 Download times: 142 View Full Text    Download reader