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2007 Cisco Systems, Inc. All rights reserved. Cisco PublicPresentation_ID 1

1550 Video Overlayfor FTTHThe New Old Reliable

Fernando Villarruel

Leonard Ray

John McKeon

Service Provider Video Technology Group


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Presentation Overview Background of Overlay in PON

Deployment Architecture Active Components

Redundancy

RF Video Overlay Capacity

Looking Forward

Conclusion


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Video Overlay in General PON Specifications

1550-1560 nm downstream optical signal transmitting a RF spectrum of frequencymultiplexed subcarriers.

Compatible with BPON, GPON, GEPON, 10GE PON (future) Can transmit analog video, and QAM based video, (digital tier.)

Methods of transmission can be amplitude modulated or frequency modulated.

Technical challenge: non-linear interaction between optical signals. Overcome bymanagement guidelines for optical signals. (Covered in paper.)


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1550 Overlay in Context

Purpose of video overlay: Comprehensive triple play

Eases the introduction digital sustained data rate applications, like IP video, without changing theend users viewing pattern or Quality of Experience (QoE.)

Immediately available video solution

Video overlay is an important discussion in the FTTH conversation.83 % of FTTH deployments in North America.

1550 video overlay is a friendly technology for PON, PON is ideal platform for RFtransmission.

Used in HFC for many years.

Conceptual and hardware understanding is mature.Powerful in PON because optics do not have to contend with coaxial plant

Ideal for general broadcast:

Information that is intended to be received by all ONUs of many OLTs.

ABC, NBC, FOX, etc..

Can be optimized for directed broadcast (multicast):

Information that is intended to be received by all ONUs of one or few OLTs

PEG channels, (local city or village channel)

Limited use for narrowcast (unicast):

Information that is received by one or few ONUs in an OLT.XOD, internet, telephony.


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Redundancy


Looking Forward

Conclusion


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Components of 1550 Overlay

Transmitter:

Electrical to optical transition point. Includes distortion compensation for linearity requirements, StimulatedBrillioun Scattering suppression for high launch powers into fiber.

Optical Amplifier Sequence:

Large optical powers needed for distribution. Most cost sensitive item in a 1550 video overlay.

Key difference from legacy RF video networks is optical amplifier capacity

Output power requirements (14 20 dBm) to maintain link budget paramenters at the ONT (25 - 28 dB) Passive components

WDM: Optical integration point of VOLT (Tx+Amp) and OLT.

PON splitter: High count splitter

ONT Video Receiver

Optical triplexer, photodiode, responsivity and noise current requirements, AGC requirements by set top box.


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Overlay Architecture (A)

Edge Modulation

Edge of IP Ring (central office,CO)

VOLT (edge modulation platform) is collocated with OLT


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Overlay Architecture (B)

Supertrunk Modulation

VOLT is not collocated with OLT. Could be separated by up to100 km.

Content originates in a headend separate from the CO


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Redundancy


Looking Forward

Conclusion


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Transmission Typical Amplitude Modulated Transmitters

Output power between 5 10 dBm

SBS suppression between 15 23 dBm for PON

Linearity to 1 GHz


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EDFAEDFA

Cladding PumpedCladding Pumped

Single-stripeLaser Pump

Multimode

Laser Pump

Larger pipe = More PowerLarger pipe = More Power

Diode Array (Broad area device)Diode Array (Broad area device) Lower $/mWLower $/mW

EDFAEDFA vsvs Cladding Pumped OperationCladding Pumped Operation


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Reception Optical triplexer decouples 1550 nm signal to

1550 optical input targets depend on analog and QAMchannel mix

Targets range from -4 to -14 dBm. Absolute RF output powers depend on AGC functions'

specified by operator


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Presentation Overview

Background of Overlay in PON


Redundancy


Looking Forward

Conclusion


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Edge modulation redundancy level 1

No redundancy: 99.998780% 6.8030 min/year Network Availability: 99.999153% 4.4540 min/year

Post Amp: 18 outputs, PON-amp: 24 outputs

432 PONS ~ 13,800 homes

43 dBm ~ 23 Watts optical power Must be cost effective in optical amplifiers


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Edge modulation redundancy level 2

Network Availability: 99.999565% 2.2886 min/year

No redundancy: 99.998780% 6.8030 min/year

Post Amp: 18 outputs, PON-amp: 24 outputs

480 PONS ~ 15,300 homes


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Redundancy


Looking Forward

Conclusion


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RF channel characteristics

Typical RF channel line up:

20 80 analog channels, 256 QAM channels up to 1 GHz.

Certain operators have opted for an all QAM line up.

Well defined figures of merit

Analog: Carrier to Noise / Second / third order harmonic distortions.

CNR / CSO / CTB

QAM: Symbol BER (bit error rate,) Symbol MER (modulation error rate)

Expected end of line performance

Analog 46 / 53 / 53

256 QAM Pre FEC BER < 1 E-7, Post FEC BER 32 dB


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Bandwidth Expectations for TV usage

50.029.022.015.012.08.0Total Mbps required

32 Home PON Gbps

HD Video

SD Video

Internet

MPEG4

1.51.00.70.50.40.3

46.021.014.07.0--------

----4.04.04.08.04.0

4.04.04.04.04.04.0

4 HDTV,

2 DVR

2 TVs + 2

HDTV

With DVR

2 TVs + 1

HDTV

With DVR

2 TVs +1

HDTV

3 TVs, 1

DVR

2 TVs, no

DVR

Assumptions:2 Mbps for SD video (MPEG4), 4Mbps for SD video (MPEG2)

7 Mbps for HD video (MPEG4), 18Mbps for HD video (MPEG2)

112.066.048.030.020.012.0Total Mbps required

32 Home PON Gbps

HD Video

SD Video

Internet

MPEG2

3.52.11.51.00.70.4

108.054.036.018.0--------

----8.08.08.016.08.0

4.04.04.04.04.04.0

4 HDTV,

2 DVR

2 TVs + 2

HDTV

With DVR

2 TVs + 1

HDTV

With DVR

2 TVs +1

HDTV

3 TVs, 1

DVR

2 TVs, no

DVR


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Video Delivery Capacity and Scalability

Sustained bandwidth vs. best effort

Not just Bit speed but quality of throughput

Latency, jitter, packet loss, sequence errors, security verification

Channel zapping, mean option score, media delivery index etc..

1 GHz Capacity:

55 MHz 1 GHz, 159 channels, 6 MHz/channel at 38.8 Mbps = 6 Gbps

795 HD / 3021 SD channels at MPEG 4 318 HD / 1590 SD channels at MPEG 2Scalability always available.

EPON with 32 users

40 Mbps

BPON with 32 users GPON with 32 users

20 Mbps

80 Mbps

6 Gbps 6 Gbps 6 Gbps

with 1550 overlay with 1550 overlay with 1550 overlay


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Redundancy


Looking Forward

Conclusion


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Looking forward

Optimize for directed broadcast transmission Advances in transmission stage, further optimization in

amplification stage


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Redundancy


Looking Forward

Conclusion


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Conclusion Purpose of video overlay: Comprehensive Triple Play

To ease the burden on OLTs for sustained data rate applications, likevideo, without changing the end users viewing expectation.

Friendly technology for transmission of Broadcast Video in PON

Dedicated bandwidth

Limited use for narrowcasting

Cost effective video delivery

Advanced optical amplification technology a must !

There will be a time when the video overlay will not be necessary,but there will never be a time when it is not extremely helpful.


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