PON Propaedeutics

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PON Propaedeutics

• David Bowler
• Motorola, Inc.

ISSCC 2008 February 5th
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PON Fiber to the Home

• PON is the state of the art last-mile
  access industry that delivers triple play
  services to home users
• Current deployments have data rates of up to 2.5
  Gbps and reaches of up to 60 km using standard
  SMF-28 fiber
• PONs impact the future of optical broadband
  networking services and the revenue flow from
  customers to service providers and to equipment
  makers (including silicon vendors)

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PON Fundamentals I The Three Colors of Light
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PON Fundamentals II Interleaved Bursts and Ranging
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So, Whats the Problem?

• Cost, Cost, Cost
• Volumes have not peaked
• Bulk optics use non-scalable manufacturing
  processes
• System cost reduction through innovation
• Technological challenges
• Architectural changes
• New designs
• Future improvements ? faster, farther and
  features
• Interoperability challenges
• Proprietary component technologies
• Immature standards

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Optical Sub-AssemblyCost Challenges

• Most of the cost is in the optical sub assembly
• Must be reduced by a factor of 10x !
• Silicon OSAs with optimized analog front-end ICs
• Eliminate hand assembly of optical components
• Improve yield and signal integrity
• Wide thermal operating range
• -40ºC to 85ºC ambient temperature

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Optical System Architecture Micro-Mechanical
Design
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Optical System Architecture Silicon OSA Design
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PON TransmitterTechnical Challenges

• Power Control function located in the MAC SOC
• Exploiting data patterns for more sophisticated
  control
• Improved laser lifetime (more than 2x)
• Less expensive calibration and manufacturing

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PON Data ReceiverTechnical Challenges

• APD (Avalanche Photo Diode) must be eliminated
• APDs are expensive and easily damaged
• PIN-FEC receivers or PIN no FEC solutions
• High sensitivity, low noise trans-impedance
  amplifiers
• Less than 200nA RMS input referred noise
• CDRs designed for noisy environments
• What about 10 Gbps PON?

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PON Video ReceiverTechnical Challenges

• Amplifier IC optimized for silicon OSA
• Dynamic range greater than 15 dB
• Sensitivity beyond -15 dBm input optical power
• Receivers optimized for broadcast HD digital
  video

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Video Dithering NoiseThe Cost of Transmitting
20 dB Hot
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PON StandardizationInteroperability Challenges

• Proprietary component technologies and
  interfaces
• System requirements exceed standards
• ITU-T G.983 (BPON 155/622 Mbps)
• ITU-T G.984 (GPON 1.25/2.5 Gbps)
• FSAN (Full Service Access Networks)
• No standard deployment architecture

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Summary The Future of PON

• Silicon OSAs with optimized analog front end ICs
• Integrated MAC and APC circuits
• Downstream PIN FEC or PIN no FEC solutions
• Wide dynamic range broadcast digital video
  receivers
• Improved standardization
• And beyond all the topics we didnt have time
  for

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