ftth conference 2011 milan workshop roberto gaudino
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FTTH Conference 2011 Milan WORKSHOPTRANSCRIPT
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Overview on recent EU projects on POF and home networks
The ALPHA and POF-PLUS projects
Speaker: Roberto GaudinoPolitecnico di Torino, Italy
Workshop: From FTTH to FITH – Complementary and Convergent In-Building Networks
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Presentation outline
The two EU projects POF-PLUS and ALPHA
The main outcomes and lessons learned from the two projects Choices on POF types 1 Gigabit/s over 50 meters: Multi-Gigabit over 50 meters: proof-of-concept “Off the beaten tracks” Radio over fiber over POF Bidirectional over POF
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The two EU projects POF-PLUS and ALPHA at a glance
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POF-PLUS
IST-FP7 STREP project n. 224521
POF-PLUS means “Plastic Optical Fibre for Pervasive Low-cost Ultra-high capacity Systems”
Duration: from May 2008 to April 2011 (3 years) Total Cost: € 3.6M EC Contribution: € 2.6M
POF-PLUS shall develop a technology based on Plastic Optical Fiber (POF) to allow delivery of Gbit/s links over
short distances for home networking and data center applications
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POF-PLUS
Strictly focused on physical-layer for 1 Gigabit/s (and more) over POF Research mostly focused on: Optoelectronic components: RC-LED vs. Lasers vs. VCSELs Fibers: SI-POF vs. MC-POF vs. GI-POF PHY layer implementation: Modulation formats Equalization structures Coding/Framing
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ALPHA IST-FP7 IP project
ALPHA means “Architectures for fLexible Photonic Home and Access networks” Duration: Jan 1, 2008 – Dec 31, 2010 Total Cost: €16.5 m EC Contribution: €11.2 m
The ALPHA consortium, consisting of European telecom operators, system vendors, research institutes and
universities, addresses the challenges of building the future access and in-building networks with support for the
transport of 2G/3G/B3G -based services.
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ALPHA
NOT only POF… The general focus is the integration of Access, Home
and In-Building networks
The activity on POF constitutes anyway a significant part of the project (approx. 15-20%)
Both projects are today close to their conclusion (March-April 2011) so that we can start talking about “Lessons Learned”
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Where did we start from?
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Where did we start from?
Situation at the beginning of the two projects (Q1-2008)
Commercial products on POF for 100 Mbit/s were available from different vendors Some European Telcos were testing POF systems for home
networking in field trials During 2008, the first “POF kits” were proposed
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Where did we start from?
The actual question was: could POF reliably support more than 100 Mbit/s transmission over approx. 50 meters? Talking about Ethernet, the target is clearly 1 Gbit/s
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Lessons Learned
Choices on POF types
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The envisioned scenario for POF
Both projects focused mostly on the residential in-building scenario for the use of POF
Both projects (and some ongoing standardization activities in ETSI and VDE-DKE) agree that for home networking application the “wish-list” is:
At least 50 meter reach 1 Gbit/s (or more)
This is seen as the natural upgrade to today commercial 100 Mbit/s POF transceivers
Thick fibers (1mm preferred) for ease of installation
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Choices on POF types
TODAY: stick with the only standardized, mass produced POF, i.e., the PMMA, 1mm, step-index POF (IEC A4a.2)
TOMORROW: very good results on PMMA multi-core POF (MC-POF) Much better bending resilience Slightly better bandwidth
If more than 1 Gbit/s is required GI-POF required, but still stick with large
diameter (1 mm) PMMA 1mm GI-POF preferred Not yet standardized Significant bending problems
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1 Gbit/s over 50 meter SI-POF
DONE!
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LUCEAT prototype (ALPHA project)
Pre-engineered prototype that reaches the targets (1 Gbit/s over 50 meters SI-POF)
Based on: On-Off modulation of red edge-emitting laser Commercial equalizer chipset at receiver
A Si-Photodiode and TIAB AGC
C Channel Equalizer
D Light source Driver
E Light Source
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Eye diagram transmitted (up) and received (down) after 50m of POF
Laboratory results
Pluggable solution & Compact dimensions:
30x30mm
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The media converter has been tested with the RFC2544 tests giving full
throughput and zero packet loss even at 50m
RFC2544 Test Set-up e Throughput results
64 192 320 448 576 704 832 960 1088 1216 1344 14720
200000
400000
600000
800000
1000000
1200000
1400000
1600000
1 Gbps Throughput test result w/ 50m of SI-POF
Packet size [bytes]
Rate
[pkt
/sec
]
Pre-industrialized media-converter test
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ISMB prototype (POF-PLUS project)
Use of RC-LED rather than edge-emitting laser Potentially even less expensive, easier packaging
But smaller output power and smaller bandwidth
Plugless connectors possible (for instance, Firecomms Optolock)
A completely new PHY was required, prototyped on an FPGA On-Off modulation Decision feedback equalization (DFE) FEC coding (simple Reed-Solomon coding)
The prototype currently gives 6 dB of optical margin at 50 meters, real time Gigabit Ethernet traffic
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ISMB prototype (POF-PLUS project)
Internal technical fair at Orange-France Telecom, Paris, 2010 December 7-9
Succesfully demonstrated on real time Gigabit Ethernet traffic
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BER pre- and post- FEC with real time Gigabit Ethernet traffic
-18 -16 -14 -12 -1010
-14
10-12
10-10
10-8
10-6
10-4
10-2
BER
Received Optical Power [dBm]
BER before FECBER after FEC
Measurement performed at “bit” level through internal monitoring features in the receiver PHY
6.5 dB of power margin
Received optical power without extra attenuation -9.5 dBm
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More than 1 Gbit/s over 50 meter SI-POF
First proof-of-concepts
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More than 1 Gbit/s? Radio-over-fiber?
Several research groups in the two projects are considering transmitting more than 1 Gbit/s over POF
Forget SI-POF and LED (available bandwidth is too limited): Optical Sources: lasers (edge-emitting or VCSEL) Fiber types: MC-POF or GI-POF
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TUE results in ALPHAPOFAC results in POF-PLUS
Several experiments performed achieving more than 5 Gbit/s Key points: Lasers Advanced modulation formats (DMT/OFDM) Optimized receivers
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Example: TUE recent resutlts
9
10 20 30 40 505
5.5
6
6.5
7
7.5
8
POF length (m)
Bit
Rat
e (G
b/s)
POF length Data Rate BER
10 m 7.6 Gb/s 6.7 E-4
20 m 7.2 Gb/s 6.3 E-4
35 m 6.2 Gb/s 8.8 E-4
50 m 5.3 Gb/s 8.5 E-4
0 50 100 150 200 25010-4
10-3
10-2
Subcarrier number
BER
5.3 Gb/s gross bit rate (4.85 Gb/s net) achieved for BER < 10-3
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POF Ribbon for Parallel Transmission(POF-PLUS)
0.55 mm
2.24 mm
Prospect for 10 Gbit/s (4x2.5 Gbit/s) on a very thin cable
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“Off the beaten tracks”
Radio over fiber over POFBidirectional over POF
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TUE experiments in Radio-over-fiber over POF
(POF-PLUS)
UWB Tx data: WiMedia MB-OFDM signal, third band (4.2 – 4.7 GHz)
• Light source: VCSEL at 650 nm (red)• Detector: PIN at visible light• POF: 50 m PMMA Graded-Index
System bandwidth: ~ 800MHz
Proposed solution:1) UWB RF signal generation, by commercial UWB transceiver2) Down-convert to IF band, via LO at 4.1 GHz3) transport over POF 4) photo-detecting5) Up-convert to original RF band, by offline software process
UWB Tx
4.1 GHz
VCSEL PIN
TIA667 nm
PMMA GI -POF
Software up -conversion and Analysis
TFC 7
DC
0 1 2
-20
Frequency (GHz)Elec
trica
l pow
er (d
B)
-30-40
-10
UWB Tx
UWB Tx
4.1 GHz
VCSELVCSEL PINPIN
TIATIA667 nm
PMMA GI -POF
Software up -conversion and Analysis
Software up -conversion and Analysis
TFC 7
DC
0 1 2
-20
Frequency (GHz)Elec
trica
l pow
er (d
B)
-30-40
-10
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POLITO bidirectional transmission over POF(ALPHA project)
POLITO succesfully demonstrated Gigabit Ethernet transmission over a single POF used for both directions over 50 meters with 6 dB of optical margin Over 75 meters with 2 dB of optical
TRANSCEIVER #1
POF
RX1
TX2
TRANSCEIVER #2
RX2
TX1
4.4 mm
2.2 mm“traditional” duplex
POF cable“simplex
POF cable
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For further information
http://www.ict-pof-plus.eu/[email protected]
To contact the coordinatorProf. Roberto Gaudino, [email protected]
www.ict-alpha.eu
To contact the coordinatorDr. Mikhail Popov, [email protected]