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FTTH Conference 2011 Workshop The Way to 1 Gbps POF Home Networks Alexander Bunge HfTL
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Transcript of FTTH Conference 2011 Workshop The Way to 1 Gbps POF Home Networks Alexander Bunge HfTL
Prof. Dr.-Ing. Christian-Alexander BungeHochschule für Telekommunikation [email protected]
The Way to 1-Gbit/s POF Home Networks
The Work of the International Standardisation Group DKE 412.7.1
Basic facts about the group and the goals
� 1 Gbit/s over up to 50�m
� 1-mm standard step-index POF (IEC 60793-2 A4a.2)
� eye safety, easy installation…
Basic facts about the group and the goals
� 1 Gbit/s over up to 50�m
� 1-mm standard step-index POF (IEC 60793-2 A4a.2)
� eye safety, easy installation…
� Goals:
� definition of „VDE Anwenderregel“ for Gigabit Ethernet over POF
� contributions to standardization bodies like, e.g., ETSI, IEC, IEEE
Meetings of the group thus far
� 9/2009: Berlin
� 10/2009: Frankfurt/Main
� 12/2009: Munich
� 2/2010: Nürnberg
� 4/2010: Frankfurt/Main
� 6/2010: Munich
� 8/2010: Leipzig
� 11/2010: Berlin
� 1/2011: Berlin
Meetings of the group thus far
� 9/2009: Berlin
� 10/2009: Frankfurt/Main
� 12/2009: Munich
� 2/2010: Nürnberg
� 4/2010: Frankfurt/Main
� 6/2010: Munich
� 8/2010: Leipzig
� 11/2010: Berlin
� 1/2011: Berlin
about 1 meetingper 2 months
Power Budget (working numbers)
� fiber coupled launch power 0.0 dBm
� LED aging/temperature -3.0 dB
� 50m fiber attenuation -9.0 dB
� spectral loss -3.0 dB
� two connectors (2 dB each) -4.0 dB
� photodiode coupling -2.0 dB
� margin -3.0 dB
� required sensitivity -24.0 dBm
Transmitter
� LED
� robust, but slow and non-linear
� RC-LED
� faster, good compromise, but availability?
Transmitter
� LED
� robust, but slow and non-linear
� RC-LED
� faster, good compromise, but availability?
� VCSEL
� linear, but lifetime, eye safety, availability
� difficult driver circuitry
Receiver
� Si photo diode
� responsivity R=0.5 A/W
� large diameter (<= 1 mm)
� coupling losses
� capacity, bandwidth
� transimpedence amplifier has to be adapted to sampling rate
Non-Return to Zero (NRZ) with equalisation
� sampling rate full 1 Gbit/s
� only two levels, no nonlinearity issues
� sophisticated equalisation (dynamic range)
Non-Return to Zero (NRZ) with equalisation
� sampling rate full 1 Gbit/s
� only two levels, no nonlinearity issues
� sophisticated equalisation (dynamic range)
� but possible (e.g. NRZ w/ DFE, POF-AC 2010):
Receiver Architecture for NRZ with decision feedback equalizer (DFE)
� single-chip implementation
� laboratory version: adaptation algorithm performed on PC
� optional: replace HP by FFE (feed forward equalizer)
Fraunhofer IIS, 2010
Real-time measurement results at 1.25 Gbit/s
� channel setup:POF length: 50 m4QW RCLED+ driver; receiver: ARX31125
� results:BER < 10-3 without FEC-> error free with FEC
� estimated receiver chip size in 90 nm CMOS (including FEC): Total: ≈1 mm2
� transmitter chip size in 90 nm CMOS: FEC encoder, driver & control circuitry: < 5 mm2 for an integrated solution
Pulse-Amplitude Modulation (m-PAM)
� lower sampling rate: log2(m) lower symbol rate
� nonlinear characteristics of components
� crest factor of the signal increases
Bandwidth efficient: 100 MHz over 275 m POF
R. Gaudino et al.: Advanced modulation format for high speed transmission over standard SI-POF using DSP/FPGA platforms. POF ’2004, Nürnberg, 27.–30.9.2004, pp. 98–105.
Discrete Multitone Transmission (DMT)
� many sub-carriers (often >512)
� optimum choice of modulation format per SC
� but high-crest factor
� signal processing at Tx and Rx
S. Loquai et al.:10.7-Gb/s Discrete Multitone Transmission Over 25-m Bend-Insensitive Multicore Polymer Optical Fiber, PTL, Vol. 22, No. 21, 2010.
Efficiency of transmission and detection scheme
S. Randel, C.-A. Bunge: Spectrally Efficient Polymer Optical Fiber Transmission, Photonics West 2011
Transmission scheme
� agreement to start with following assumption
� m-PAM transmission (m>4)
� discussion on the equalisation scheme (error propagation)
� FFE-DFE or Tomlinson-Harashima pre-coding
Transmission scheme
� agreement to start with following assumption
� m-PAM transmission (m>4)
� discussion on the equalisation scheme (error propagation)
� FFE-DFE or Tomlinson-Harashima pre-coding
� frame structure
� training sequence
� transmission of physical parameters
Passive optical interface
� development of measurement methods
� power distribution
� standardised excitation conditions
� connector-loss measurements
� bandwidth measurement
Passive optical interface
� development of measurement methods
� power distribution
� standardised excitation conditions
� connector-loss measurements
� bandwidth measurement
� generation of standardised excitation conditions
Passive optical interface
� development of measurement methods
� power distribution
� standardised excitation conditions
� connector-loss measurements
� bandwidth measurement
� generation of standardised excitation conditions
� collaboration within IEC with Japanese activity
Evolution of the standard
� 1st phase: fast market entrance (private customers)
� existing technologies
� lower requirements: approx. 25�m, no connectors??
Evolution of the standard
� 1st phase: fast market entrance (private customers)
� existing technologies
� lower requirements: approx. 25�m, no connectors??
� 2nd phase: fulfillment of all requirements (professional)
� use of progress mainly for power budget
Evolution of the standard
� 1st phase: fast market entrance (private customers)
� existing technologies
� lower requirements: approx. 25�m, no connectors??
� 2nd phase: fulfillment of all requirements (professional)
� use of progress mainly for power budget
� 3rd phase: evolution
� longer lengths or higher bitrates???
Interested?
� next meeting will be March 17th in Nürnberg at POF-AC
� further information on the websitehttp://www.vde.com/en/dke/std/projects/POF/Pages/default.aspx
� contact:
� T. Sentko: [email protected]
� C.-A. Bunge: [email protected]
� O. Ziemann: [email protected]