1550 Video Overlay for FTTH
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1 1550 Video Overlay for FTTH The New Old Reliable Fernando Villarruel Leonard Ray John McKeon Service Provider Video Technology Group 1
2 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 2
3 Video Overlay in General PON Specifications nm downstream optical signal transmitting a RF spectrum of frequency multiplexed 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 by management guidelines for optical signals. (Covered in paper.) 3
4 1550 Overlay in Context Purpose of video overlay: Comprehensive triple play Eases the introduction digital sustained data rate applications, like IP video, without changing the end user s 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 video overlay is a friendly technology for PON, PON is ideal platform for RF transmission. 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 ONU s 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 ONU s in an OLT. XOD, internet, telephony. 4
5 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 5
6 Components of 1550 Overlay Transmitter: Electrical to optical transition point. Includes distortion compensation for linearity requirements, Stimulated Brillioun 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. 6
7 Overlay Architecture (A) Edge Modulation Edge of IP Ring (central office,co) VOLT (edge modulation platform) is collocated with OLT 7
8 Overlay Architecture (B) Supertrunk Modulation VOLT is not collocated with OLT. Could be separated by up to 100 km. Content originates in a headend separate from the CO 8
9 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 9
10 Transmission Typical Amplitude Modulated Transmitters Output power between 5 10 dbm SBS suppression between dbm for PON Linearity to 1 GHz 10
11 EDFA vs Cladding Pumped Operation EDFA Single-stripe Laser Pump Cladding Pumped Multimode Laser Pump Larger pipe = More Power Diode Array (Broad area device) Lower $/mw 11
12 Reception Optical triplexer decouples 1550 nm signal to 1550 optical input targets depend on analog and QAM channel mix Targets range from -4 to -14 dbm. Absolute RF output powers depend on AGC functions' specified by operator 12
13 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 13
14 Edge modulation redundancy level 1 No redundancy: % min/year Network Availability: % 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 14
15 Edge modulation redundancy level 2 Network Availability: % min/year No redundancy: % min/year Post Amp: 18 outputs, PON-amp: 24 outputs 480 PONS ~ 15,300 homes 15
16 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 16
17 RF channel characteristics Typical RF channel line up: 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 / QAM Pre FEC BER < 1 E-7, Post FEC BER <1 E-12, MER > 32 db 17
18 Bandwidth Expectations for TV usage MPEG2 2 TVs, no 3 TVs, 1 2 TVs +1 2 TVs + 1 HDTV 2 TVs + 2 HDTV 4 HDTV, 2 DVR DVR DVR HDTV With DVR With DVR Internet SD Video HD Video Total Mbps required Home PON Gbps MPEG4 2 TVs, no 3 TVs, 1 2 TVs +1 2 TVs + 1 HDTV 2 TVs + 2 HDTV 4 HDTV, 2 DVR DVR DVR HDTV With DVR With DVR Internet SD Video HD Video Total Mbps required Home PON Gbps Assumptions: 2 Mbps for SD video (MPEG4), 4Mbps for SD video (MPEG2) 7 Mbps for HD video (MPEG4), 18Mbps for HD video (MPEG2) 18
19 Video Delivery Capacity and Scalability 6 Gbps 6 Gbps 6 Gbps 80 Mbps 40 Mbps 20 Mbps EPON with 32 users BPON with 32 users GPON with 32 users with 1550 overlay with 1550 overlay with 1550 overlay 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 HD / 1590 SD channels at MPEG 2 Scalability always available. 19
20 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 20
21 Looking forward Optimize for directed broadcast transmission Advances in transmission stage, further optimization in amplification stage 21
22 Presentation Overview Background of Overlay in PON Deployment Architecture Active Components Redundancy RF Video Overlay Capacity Looking Forward Conclusion 22
23 Conclusion Purpose of video overlay: Comprehensive Triple Play To ease the burden on OLTs for sustained data rate applications, like video, without changing the end user s 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. 23
24 24
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