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Cost Effective Scheme for OLT in Next Generation Passive Optical Access Network Based on Noise Free Optical Multi Carrier

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China Communications 2016年第6期13卷 76-87页

作者： Rahat Ullah Bo Liu Qi Zhang Qinghua Tian Amjad Ali Yousaf Khan Feng Tian M.Azam Zia Haseeb Ahmad Lijia Zhang Xiangjun Xin State Key Laboratory of Information Photonics and Optical Communications.Beijing University of Posts and Telecommunications No.10 Xitucheng RoadBeijingChina100876 School of Electronic Engineering Beijing University of Posts and TelecommunicationsNo.10 Xitucheng RoadBeijingChina100876 Sarhad University of Science and Information technology PeshawarPakistan. Electrical Engineering Department Iqra University PeshawarPakistan. State Key laboratory of Network and Switching Technology Beijing University of Posts and TelecommunicationsNo.10 Xitucheng RoadBeijing100876China

We propos e a cos t-effective multi-carrier generation technique which minimizes the passive optical access network(PON) costs. In this study replacement of laser array with multi-carrier source at optical line terminal(OLT) side in PON is addressed. With 25-GHz frequency spacing, the generated optical multi-carriers exhibit good tone to noise ratio(TNR) i. e. above 20 d B, and least amplitude difference i. e. 1.5d B. At the OLT, multi-carriers signal based multiplexed differential phase shift keying(DPSK) data from all the channels each having 10 Gbps for downlink is transmitted through 25 km single mode fiber. While the transmitted information is retrieved at optical network unit(ONU), part of the downlink signal is re-modulated using intensity modulated(IM) on-off keying(OOK) for upstream transmission at 10-Gbps. Simulation results are in good agreement with the theoretical analysis, showing error free transmission in downlink and uplink with 10 Gbps symmetric data rate at each channel. The receivedpower, both for uplink and downlink transmission, is adequate for all channels at BER of 10-9 with minimum power penalties. Power budget is calculated for different splitting ratios showing excellent system margins for any unseen losses. The proposed setup provides a cost-effective way minimizing transmission losses, and providing greater system's margin in PON architecture.

关键词： differential phase shift keying intensity modulated on-off-keying optical frequency comb generation optical access network

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Impact of Rayleigh backscattering on single/dual feeder fiber WDM-PON architectures based on array waveguide gratings

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Frontiers of Optoelectronics 2013年第1期6卷 102-107页

作者： Muhammad Idrees AFRIDI Jie ZHANG Yousaf KHAN Jiawei HAN Aftab HUSSEIN Shahab AHMAD State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China

The performance of colorless wavelength-division multiplexing passive optical network (WDMPON) systems suffers from transmission impairments due to Rayleigh backscattering (RB). A single feeder fiber colorless WDM-PON architecture was modeled, simulated and analyzed at 25 km distance that sustained the noise induced by RB. We analytically compared the performances between single feeder and dual feeder WDM-PON architectures based on array waveguide gratings (AWGs). For single feeder WDM-PON, the high extinction ratios in both return-to-zeros (RZ)-shaped differential phase shift keying (DPSK) downstream and intensity remodulated upstream data signals helped to increase the tolerance to the noise induced by RB. However, a cost effective colorless system in dual feeder WDM-PON architecture was achieved without any optical amplification and dispersion compensation, low power penalty. These results illustrate that single feeder fiber architecture was cost effective in terms of deployment having a power penalty, while dual feeder fiber had lower power penalty thereby with better performance. Simulation results show that downstream and upstream signals achieved error-free performance at 10-Gbps with negligible penalty and enhanced tolerance to the noise induced by RB over 25 km single mode fiber.

关键词： wavelength division multiplexed-passive optical network (WDM-PON) Rayleigh backscattering (RB) differential phase shift keying (DPSK) arrayed waveguide grating(AWG) Fiber extinction coefficients differential phase shift keying backscattering penalty Propagation losses Stimulated emission ARCHITECTURE Arrayed waveguide gratings Noise data signal Dispersion compensation Rayleigh Rubidium

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