tunable dwdm pon at wdm pon forum workshop
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Stephan Neidlinger, WDM PON Forum Workshop
Nice, France, June 23, 2014
Tunable DWDM PON
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 2 2
Today’s CWDM Backhaul
ONU 1
ONU 2
ONU N
POP Fastweb
OLT or PoP Remote Node
• Shipping in volumes
• Dual fiber working CWDM design with up to 16 channels supported
• Outdoor deployment supported (ext. temp range: -25°C to +70°C)
• Pluggable modules used having fixed wavelengths
CPE SFP+ /XFP
RX TX
CPE SFP+ /XFP
RX TX
Feeder Fiber
Distribution Fiber
CPE SFP+ /XFP
RX TX
SFP+/XFP TX RX
SFP+/XFP TX RX
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 3 3
Passive WDM
Colored CWDM/DWDM Colored CWDM/DWDM
Challenges of Passive Optical Multiplexing
Passive optical multiplexing is the most cost effective WDM solution, but there are some challenges involved
• No clear demarcation between client and transport equipment
• Client equipment has no integration into a transport-NMS
• Root cause analysis is difficult as there is only limited information available at the central node about the far end
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 4 4
Moving to higher Service Channel Counts
• Increasing wavelength channel throughput
• Using multiplexing transponders (Time Division Multiplexing)
• Ideal for GbE services
• Increasing number of wavelengthes
• Dense wavelength division multiplexing (DWDM)
• Ideal for higher bit rate services
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 5 5
Increasing Wavelength Channel Throughput TDM/CWDM Backhaul
POP Fastweb
CO or PoP Remote Node
• Reuse of (deployed) CWDM infrastructure
• Multiplexing transponders in CO/PoP and remote node or at customer premises
• Additional demarcation function
Feeder Fiber
e. g.
Nx GbE
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 6 6
• Number of wavelength channels 40/80 (or more)
• Key requirements/challanges
• OLT: PIC-based multi channel DWDM transceiver modules
• Outdoor capable DWDM filters (-25°C to +70°C)
• ONU: Tunable laser components
• System: Wavelength tuning mechanism
Increasing Number of Wavelengthes DWDM PON
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 7 7
Tunable DWDM PON System Architecture
40/80 channel
DWDM Tb/s Aggregation OLT Central wavelength control
PIC-based Nx 1..10G DWDM
transceiver module
Low-cost tunable 1..10G SFP/SFF
transceiver ITU-T G.698.3 wavelength grid
Transparent service delivery to large number of users
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 8 8
Tunable DWDM PON Wavelength tuning mechanism
ONU#n
SFP OLT
RN
AW
G
TX/RX
Array
PIC … Tunable LD
Receiver
l-Control
C/L Tuning
So
C,
Clie
nt I/
Fs, e
tc.
Wavelength
Control Loop
L2
Access
Switch
Auto-tuning of ONU, controlled by OLT
© 2014 ADVA Optical Networking. All rights reserved. Confidential. 9 9
C/DWDM PON Summary
C/DWDM PON supports today’s needs and delivers a future-proof upgrade path
• Simple, robust
• Outdoor capable
• Shipping in volumes
CWDM PON
• Increased service channel count
• Reuse of existing CWDM infrastructure
TDM/CWDM
• Highest channel count
• Transparent service delivery
DWDM PON
info@advaoptical.com
Thank You
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