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…


� 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

Participants (selection)

Meetings of the group thus far

� 9/2009: Berlin

� 10/2009: Frankfurt/Main

� 12/2009: Munich

� 2/2010: Nürnberg


� 6/2010: Munich

� 8/2010: Leipzig

� 11/2010: Berlin

� 1/2011: Berlin

Meetings of the group thus far

� 9/2009: Berlin


� 12/2009: Munich

� 2/2010: Nürnberg


� 6/2010: Munich

� 8/2010: Leipzig

� 11/2010: Berlin

� 1/2011: Berlin

about 1 meetingper 2 months

Main issues

Bandwidth of the POF

electrical frequency response of 50m POF channel

Attenuation of the POF

Wavelength [nm]

Att

enua

tion

[dB

/m]

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

Transmitter

� LED

� robust, but slow and non-linear

Transmitter

� LED


� RC-LED

� faster, good compromise, but availability?

Transmitter

� LED


� 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

Modulation schemes

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.

Comparison of the transmission schemes

Efficiency of transmission and detection scheme

S. Randel, C.-A. Bunge: Spectrally Efficient Polymer Optical Fiber Transmission, Photonics West 2011

Experimental results: NRZ vs PAM-4

Current status

Transmission scheme

Transmission scheme

� agreement to start with following assumption

� m-PAM transmission (m>4)

Transmission scheme



� discussion on the equalisation scheme (error propagation)

� FFE-DFE or Tomlinson-Harashima pre-coding

Transmission scheme



� 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







� generation of standardised excitation conditions







� 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??





� 2nd phase: fulfillment of all requirements (professional)

� use of progress mainly for power budget





� 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]

ftth conference 2011 workshop the way to 1 gbps pof home networks alexander bunge hftl

Documents

pof length

pof contributions

pof channelattenuation

standard sipof

db margin

standard stepindex pof

equalisation sampling

nonlinear rcled