Prospects for point-to-point technology to deliver 1...
Transcript of Prospects for point-to-point technology to deliver 1...
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10 years ago …
Prospects for point-to-point technology to deliver 1 Gigabit/s to the home
Gerlas van den Hoven, Maurice de Laat, Richard Duijn, Elroy Pluk
Genexis B.V. Netherlands
www.genexis.eu
Point‐to‐point
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Point-to-point networks
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Wavelength allocation
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Key features of PTP networks
• Each user has a dedicated connection: No contention issues Symmetrical bandwidth High port count in central office
• Pure Ethernet Full set of Ethernet functionality: VLANs, QoS Enables multiple services from multiple service providers
(unbundling!)
• No power budget issues Use of low-cost optics even at higher bandwidths
• Passive network But at the expense of high fiber count
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Why does Europe choose PTP?
• Future-proof network Point-to-point fiber infrastructure is technology independent Geographic distances are smaller than in other regions: fiber-
cost is less of an issue Ethernet is the most open and accepted standard in
communications
• Unbundling European commission is active promoter of point-to-point
architectures Many operators have unbundling strategies
• Scalable & upgradeable per user If end-user wants more, simply upgrade his/her connection No need to enter the home every time
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Why a full Gigabit for each user?
Faced with limited resources, the applications are restricted to only the bare necessities
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Why a full Gigabit for each user?
Given an abundance, the applications are limitless
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Why a full Gigabit for each user?
• Last mile becomes fully open… … no longer being the bottleneck in the network
• Any type of service becomes possible
• No upgrading required for a long time
• Lowest operational cost
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1 Gbit/s to the home
What are the ways in which 1 Gbit/s to the home may be realized?
1. Brute force approach: provide each home with a dedicated 1 Gbit/s link
2. Integration: integrate multiple channels into a single module
3. WDM-PON: provide the Gbit/s capacity as dedicated wavelengths
4. Hybrid networks: Combine the best of PTP and PON in a hybrid network
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Brute force
Dedicated 1 Gbit/s link to each home:
1490
1310
13
10
1490
Ethernet/IP
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High density Gigabit/s ports
Courtesy of
• 480 Gigabit/s ports in rack; 24 ports per line card • Includes RF overlay • Comparison: GPON has two OLTs per line card serving
maximum 128 but typically 50 users
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Integration approach
• Combine multiple Gigabit/s ports into a single optical module • Example: active optical cable • Applied to FTTH this approach enable 10x increase in density
and a 3x decrease in power consumption
Finisar Luxtera
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Why photonic integration for FTTH?
FTTH facts
• FTTH requires the lowest of costs in telecommunication
• FTTH volumes are in the millions
• Space and power consumption are key issues in FTTH
• Performance must be “good enough”
How photonic integration will help
• For simple functions, photonic integration can beat the alternatives
• Photonic chips can be fabricated in a high-volume, wafer-scale manner
• Photonic chips are more power-efficient than electronic ones, and can be much smaller
• Integration is always a performance trade-off, but “good enough” is more than sufficient for Gigabit/s point-to-point networks!
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WDM PON
WDM-PON is a best of both worlds: • Point-to-point network architecture provides dedicated a
secure bandwidth • PON fiber topology
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WDM-PON challenges
The best of both worlds doesn’t come for free! • Space and power consumption are a big issue at the OLT side • Colourless transceiver is a requirement at ONT
Multi-wavelength transmitter by Intel
Colourless transceiver by CIP
WDM-PON ecosystem initiative will speed–up developments
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Hybrid networks?
Passive Optical Networks • Shared medium: need high
speed transmitters and receivers just to receive moderate bandwidth
• Hard to upgrade per user • Some dynamic bandwidth
allocation
Switched Ethernet • Point-to-point architecture:
dedicated transmitters and receivers provide high bandwidth
• Easier to upgrade • But: no dynamic bandwidth
allocation
Today we are wasting bandwidth!
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Providing “effective” bandwidth
PON
λ – Router
FlexPON
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FlexPON network
• Central office combines downstream and continuous wave signals • Wavelength router in remote node drops wavelength pairs • Optical network unit independent of wavelength
– Remote modulation using colourless transceiver
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FlexPON wavelength router
• Low cost planar lightwave circuit (SiON) chip
• Requires electrical power for wavelength switching
• Simple driving circuit, low power consumption and high reliability
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Experimental results
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1 Gigabit/s to the home?
Point-to-point networks can deliver 1 Gigabit/s to the home in a variety of ways:
1. Current technology can already provide cost-effective solutions at competitive density and power consumption
2. Integration of transceiver technology can enable a breakthrough in 1 Gigabit/s deployment
3. WDM-PON combines best-of-both worlds; number of technology steps still required
4. Hybrid networks provide highly effective bandwidth and offers bandwidth upgrade strategies as conventional PONs hit the bandwidth limit
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But do we need 1 Gigabit/s?
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