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ITU-T Kaleidoscope 2009 Innovations for Digital Inclusion

RoFSO: A Universal Platform for Convergence of Fiber and Free-Space Optical Communication Networks. ITU-T Kaleidoscope 2009 Innovations for Digital Inclusion. Kamugisha Kazaura 1 , Kazuhiko Wakamori 2 , Mitsuji Matsumoto 2 ,

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ITU-T Kaleidoscope 2009 Innovations for Digital Inclusion

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  1. RoFSO: A Universal Platform for Convergence of Fiber and Free-Space Optical Communication Networks ITU-T Kaleidoscope 2009Innovations for Digital Inclusion Kamugisha Kazaura1, Kazuhiko Wakamori2, Mitsuji Matsumoto2, Takeshi Higashino3, Katsutoshi Tsukamoto3 and Shozo Komaki31Research Institute for Science and Engineering, Waseda University 2Global Information and Telecommunication Institute, Waseda University 3Graduate School of Engineering, Osaka University kazaura@aoni.waseda.jp

  2. Contents • Overview of FSO systems • Proposed RoFSO system • Performance evaluation of RoFSO system • Mobile cellular W-CDMA service • Wireless LAN service • Conclusion 2/12

  3. Overview of FSO systems Seamless connection of free-space and fiber FSOantenna Optical fiber WDM FSO channel New generation FSO system • New generation FSO system • Uses 1550nm wavelength • Seamless connection of free-space and optical fiber. • Multi gigabit per second data rates (using optical fiber technology) • Compatibility with existing fiber infrastructure • Protocol and data rate independent • Developed RoFSO system • Uses 1550nm wavelength • Transport multiple RF signals using WDM RoFSO channels • Universal platform for providing heterogeneous wireless services e.g. WLAN, 3 GPP Cellular systems, terrestrial digital TV etc Cellular RoFSO antenna DVB WiFi RoF RoF WDM RoFSO channel WiMAX Various wireless service signals Developed RoFSO system • FSO: Transmission of a modulated visible or infrared beam through the atmosphere to obtain broadband communication. • Advs: Secure, easy to deploy, license free, high data rate. • Disadvs: Influenced by weather and can not propagate through obstacles. 3/12

  4. Proposed RoFSO system 1 Internet Mountainous terrain RoFSO transceiver andremote base station Metro network extension Backhaul(~5 km) Areas with nofiber connectivity RoFSO link Optical fiber link RF based links RoFSO transceiver Remote locatedsettlements Features of Radio-on-FSO technology RoFSO = FSO + RoF • Application areas • Metro network extension • Last mile access • Enterprise connectivity • Fiber backup • Interconnectivity of distributed antenna systems Application scenario • RoF: Technique of modulating RF subcarriers onto an optical carrier for distribution over fiber network. • Advs: Transmission of RF signals at low costs, longer distance and low attenuation. • Disadvs: Dependent on availability of installed optical fiber. 4/12

  5. Proposed RoFSO system 2 Main transmit and receive aperture Si PIN QPD for coarse tracking BS1 SMF BS2 Collimator FPM Beacon signaltransmit aperture Beacon source InGaAs PIN QPDfor fine tracking Main transmit and receive aperture Beacon signal transmit aperture Advanced RoFSO terminal RoFSO antenna optical path and devices layout RoFSO antenna photo Specifications of the RoFSO antenna • Key features: • Optimized for transmission of RF signals with frequency range of operation more than 5 GHz. • Can suppress most atmospheric turbulence induced effects like scintillation, beam wander, AOA fluctuations which have significant impact on performance of RoFSO signal propagating through free-space. 5/12

  6. Performance evaluation of RoFSO system 1 RoFSO antenna RoFSO antenna Output monitor SMF 1 km 3dB coupler Optical IF unit Optical IF unit EDFA EDFA 100 mW 2.5 GbpsOpt. Tx. 2.5 GbpsOpt. Rx. Optical SA Power meter RF IF unit RF IF unit Filter Atten. BERT BERT Data logging PC 3GPP/WLAN/ISDB-T SGs W-CDMA SA WLANSA Data logging PC RF circulator Power splitter ISDB-TSA WLANAP TV WLAN throughput measurement PC 5 GHz amplifier unit Bldg. 55S Okubo Campus Bldg. 14 Nishi Waseda Campus SA: Signal AnalyzerSG: Signal Generator Experimental setup for evaluation of the RoFSO system. 6/12

  7. Performance evaluation of RoFSO system 2 SpectrumAnalyzer ISDB-T IFUnit Digital Mobile Radio Transmitter Tester Optical IFUnit Bldg. 14 Nishi Waseda campus RF IFUnit 802.11a amplifier Antenna tracking adjustment PC Opticalsource Weather device BoostEDFA RF-FSO antenna 802.11a IF Unit Atmospheric effects measurement antenna RoFSO antenna Bldg. 55S Okubo campus rooftop Digital Oscilloscope Opt. spectrumAnalyzer Atmospheric effects recording PC Bit Error Rate Tester (BERT) Optical power meter RoFSO system experiment devices Devices setup in the laboratory Devices setup on the rooftop 7/12

  8. Performance evaluation of RoFSO system 3 Wireless signal wavelength assignment Received WDM spectrum ISDB-T W-CDMA 802.11g 802.11a 1552.52nm 1553.33nm 1551.72nm 1554.13nm Note: *1ISDB-T: Integrated Services Digital Broadcasting – Terrestrial is Japanese standard for digital television (DTV). *2 Channel 33 is used for evaluating the RoFSO system performance in terms of BER by transmitting digital signal at 2.5 Gbps. 8/12

  9. Performance evaluation of RoFSO system 4 Mobile cellular W-CDMA service 5 MHz offset 45dB 50dB 10 MHz offset Received W-CDMA signal ACLR spectrum (3GPP Test Signal) ACLR and received optical power characteristics • ACLR is a quality metric parameter specified by the 3GPP for evaluating W-CDMA signal transmission. • 3GPP specifies ACLR value of 45 dB at 5 MHz offset and 50 dB at 10 MHz offset. ACLR: Adjacent Channel Leakage Ratio 9/12

  10. Performance evaluation of RoFSO system 5 Wireless LAN service WLAN 802.11g spectrum mask2.4 GHz with 54 Mbps, 64 QAM Template: Fail Template: Pass WLAN 802.11g throughput and received optical power characteristics WLAN 802.11a spectrum mask 5 GHz with 54 Mbps, 64 QAM 10/12

  11. Conclusion • Presented a new innovative broadband wireless communication system based on RoFSO suitable for application as universal platform for providing convergence of fiber and free-space. • Evaluation of the transmission performance of the proposed RoFSO system when simultaneously transmitting multiple wireless services signals has demonstrated consistent performance in terms of specified quality metric parameters in the absence of severe weather conditions and using properly design interface units. • Confirmed that the technology is well suited for deployment as an advanced wireless communication system in the emerging NGN having potential to play a key role in Digital Inclusion. • For rapid maturity and adaptation of the technology, early initiatives for standardization studies will be beneficial. • Future work involves collecting long term measurement data required for a comprehensive and statistical analysis of the system performance in different conditions. 11/12

  12. Supported by Thank you for your attention! This work was supported by a grant from the National Institute of Information and Communications Technology (NICT) of Japan kazaura@aoni.waseda.jp Kamugisha Kazaura 12/12

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