C-band Wavelength Plan for 10G EPON Downstream
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1 C-band Wavelength Plan for 10G EPON Downstream Dongsoo Lee, IEEE 802.3av 10Gb/s EPON TF Atlanta, Georgia USA - November 2007
2 10G EPON Wavelength Plan Upstream wavelength is 1260nm ~ 1280nm Downstream wavelength is selected to 1574nm ~ 1580nm for coexistence with RF video overlay and OTDR monitoring signal PR10/20 Downstream wavelength is not decided yet Spectral Bands [Ref. ITU-T G Supp39] CWDM Grids [Ref. ITU-T G.694.2] O-band E-band S-band C-band L-band U-band Constraints from Existing Systems [Ref. 3av_0705_otaka_1] Fiber water-peak 1G ONU may receive OTDR filter IEEE 802.3ah EPON with RF video overlay U/S D/S Video IEEE 802.3av 10G EPON PR10/20/30 Upstream Downstream 2
3 PR10/20 Downstream Wavelength Downstream Wavelength Plan Center Wavelength PR10/20 Candidates L-band plan 1) C-band plan 2) 1590nm 1550nm 1577 nm Band 1580 ~ 1600nm (20nm bandwidth) 1545 ~ 1565nm (20nm bandwidth) 1574 ~ 1580nm (6nm bandwidth) Availability of EML Maybe 1~2 years after standard Now Maybe 1~2 years after standard Coexistence 1G EPON 1G EPON 1G EPON RF Video overlay OTDR monitoring RF Video overlay OTDR monitoring Remarks Coexist with RF video overlay DWDM/CWDM grid EML/SOA/EDFA available Note 1) Option C in 3av_0709_effenberger_1.pdf, 2) 3av_0709_lee_1.pdf 1G EPON Down Video -D P10/20-D C-band plan PR10/20-D L-band plan 1460 S-band 1530 C-band 1565 L-band
4 Options for Video over PON Video-overlay Option Allocation of additional wavelength 1550nm ~ 1560nm Similar to CATV delivery method Exploit the existing cable infrastructure Re-use of STB at home Fundamentally one-way system No return channel via overlay wavelength Limited bandwidth for unicasted VoD service Costly triplexer at ONT IP based in-band video service Data and video use the same IP transport mechanism Highly interactive Real converged network Only low-cost diplexer Digital IP video Option 2λ W D M IP STB needs to be newly deployed 2λ W D M Digital Digital Analog (EDFA) 3λ W D M 3λ W D M Digital Analog 2 operators have deployed this option in a FTTx infrastructure More than 2 Telco operators are willing to use this method. Video-overlay option is initial solution, especially for 1G EPON IP video option is long-term solution 4
5 IP video over 10G EPON Long-term solution for video Video-overlay option is attractive at initial state due to the reuse of the cable infrastructure and the extended bandwidth for video delivery in 1G EPON However, IP video option offers competitive advantages against video-overlay option in terms of high interactivity and service personalization While, video-overlay option does not support RF return path for interactive service and does not support sufficient bandwidth for personalized on-demand service Do we need RF overlay in coexistence with 10G EPON? CATV provides equivalently around 5Gb/s bandwidth 3) 10G EPON provides more bandwidth for IP video delivery than CATV Note 3) source: yoon_1_0706.pdf 5
6 Proposal (1) PMD PR20-D PR10-D Wavelength plan Component features Remarks C-band: 1550nm (1545 ~ 1565nm) High output power (maximum +9~+10 dbm) Coexistence with RF video overlay is limited due to SRS effect from high power data signal IP video delivery without WDM overlay Use of existing CWDM/ DWDM source without waiting for new EML Future upgrade to high split ratio (> 64) 1577nm (1574 ~ 1580nm) Use of high power EML as -D Reuse of -D source Possibly 20nm bandwidth when uncooled EML is required 6
7 Proposal (2) Downstream Common use of HP-EML -D HP-EML (1577nm) 29dB CHIL APD PR20-D Amp. EML (1550nm) 24dB CHIL Pin-PD PR10-D HP-EML (1577nm) 20dB CHIL Pin-PD Upstream Optical Power -U HP-DML (1270nm) 29dB CHIL APD PR20-U DML (1270nm) 24dB CHIL APD PR10-U DML (1270nm) 20dB CHIL APD Optical Power 7
8 Wavelength Plan for 10G EPON Downstream Coexistence with 1G EPON + RF video overlay: 1577nm 1G EPON Down Video -D 1460 S-band 1530 C-band 1565 L-band 1625 Greenfield & Coexistence with only 1G EPON: 1577nm or 1550nm 1G EPON Down P20-D -D 1460 S-band 1530 C-band 1565 L-band 1625 Future Upgrade (> 64 split ratio): 1550nm No coexistence due to the gap of power budget between the existing and the required PR40 (?) 1460 S-band 1530 C-band 1565 L-band
9 Conclusions 1550nm EML is widely available Availability of 1550nm EML makes it easy to initial deployment of 10G EPON Will 10G EPON require video overlay option? Upcoming video service requires interactivity and personalization based on IP transport mechanism 10G EPON is able to provide enough bandwidth for IP video delivery, which is different from 1G EPON case Especially for PR20-D, analogue RF video signal may degrade from SRS effect caused by amplified data signal For coexistence with the existing network, We have already prepared a solution for coexistence with 1G EPON + RF video overlay; 1577nm for -D Coexistence with only 1G EPON is possible with 1550nm wavelength plan of 10G EPON downstream C-band wavelength plan is valid for PR20-D D of 10G EPON 9
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