1. WDM-PON as efficient Campus and Metro Infrastructure
TNC2013, Maastricht, June 2013
Dr. Klaus Grobe, Dr. Jörg-Peter Elbers, ADVA Optical Networking SE

2. Content
Passive WDM
WDM-PON

3. Passive WDM

4. Options for optical Networking
Passive Transport
WDM Transport
Filter
Transport System
Fixed-wavelength WDM Pluggables
Application (Switch)
Application (Switch)
Simple setup
Low latency
Low power and space consumption
Few active components – good MTBF
No performance monitoring
No optical surveillance, no protection
Amplification difficult, at best
Limited scalability, no TDM, max. 80  10G
Amplification, distances up to 2500 km
TDM option for higher aggregate bandwidth
Scalable up to 96  100G
Protection switching
Optical in-band management
Optical performance monitoring
Embedded encryption option for all signals
Higher power and space consumption

5. Installing a passive Link the old Way
CapEx Index 1.0
XFP #1 #2
#40
WDM
40-Channel WDM
Filter Shelf …
Logistics
40 different transceiver part numbers
Spare-parts pool required
Setup
Correlate near-end plug and WDM port to far-end plug and WDM port
Trust power levels or use additional measurement equipment
Supervision
No optical-layer monitoring, external OSA required
No visualization of in-service wavelengths, external OSA required

6. Take the best of both worlds
Options for optical networking
Passive Transport
WDM Transport
Take the best of both worlds
Simple setup
Low latency
Low power and space consumption
Few active components
Performance monitoring and spectrum analyzer
Amplification for extended distances
Scalable up to 96 wavelengths
Protection switching

7. Tunable passive WDM … Tracer S-T-XFP Logistics Setup Supervision
1U Tracer Shelf
S-T-XFP #1 #2
#96
WDM
96-Channel WDM
Filter Shelf …
Tracer
960G Capacity
Smart T-XFP
Logistics
Single universal tunable plug for 96 ITU-T WDM channels
Setup
Put plug to router slot
Connect plug with any free WDM port, choose same port at remote location
Supervision
In-service wavelengths
Power levels in both directions, power-level alarm thresholds
Plug data (voltage, temperature, laser bias current, …)

8. The Smart T-XFP TX MSA-compatible XFPRX
Tune µC TX
From and to Host
Out In
1k k 100k 1M M G
Er+ Lifetime FM Carriers Transport Protocol
RF Spectrum
f [Hz]
MSA-compatible XFP
Remote control and tuning of all transceivers – host needn’t support tuning
Access transceiver data via RF communication channel
Remote-transceiver performance and wavelength-allocation monitoring
Every other transceiver or test points can access communication channel
50 GHz, up to 96 channels

9. The Tracer RX TX µC
Out In
Link Side
Client Side
Broadcast Messaging for Out-of-Service Channels
Detect RF, read Tuning Protocol
Detect RF, read Tuning Protocol
Tracer allows bi-directional communication with Optojack pluggables
Broadcast messaging for in-service and out-of-service wavelengths
Automatic wavelength management (without host/client involvement)
Remote-loop switching
Shows WDM wavelength presence and RF spectrum analysis

10. Automatic Tuning and Spectrum Analysis
RF Feedback Loop
OJ TXFP …
Tracer
Graphical User I/F
WDM
Plug powered and wired
Wavelength tuning does not require the far-end
New plugs automatically get wavelength-assigned
Plug autonomously starts wavelength and RF sweep
Tracer detects new RF tone
Tracer sends set-wavelength command to plug (via RF)
Plug goes in service

11. Next Step Next step: adopt concept to the upcoming Tunable SFP+
Allows transparent passive optical networking with bit rates ~10G
Efficient solution for business access, backhaul, fronthaul

12. WDM-PON

13. Towards WDM-PON ... Allow point-to-multipoint distribution
PoP
Core Network
AGS
Campus
Tracer
WDM RN
OLT
T-LD
...
Allow point-to-multipoint distribution
Autonomous tuning of remote transceivers
Without host intervention
Via local transceivers
Support various bit rates and sufficient reach
Integrate aggregation (AGS) in OLT

14. Evolution to low-cost Laser Diodes
Tone: Pilot-Tone Generator, PD: Photo Diode, TIA: Transimpedance Amplifier, ECC: Embedded Communications Channel RN
CAWG
OLT
Array
RX incl.
AWG
TX incl.
C/L
(Tone)
Tracer
ECC
Tone
L-Band 50/100 GHz
C-Band ~50/100 GHz
ONU (CPE)
T-LD PD
TIA
Tune
Uses low-cost tunable LDs (not yet available)
Single-Fiber Working via Cyclic AWG (CAWG)
C-Band upstream (e.g., 100 GHz)
L-Band downstream (then, 97.5 GHz)

15. Cyclic AWG (G.698.3)
1400
Attenuation [dB/km]
0.5
1.0
1500
Wavelength [nm]
1600
E-Band
S-Band
C-Band
L-Band
U-Band
G C-Band
G S+-Band
G L-Band
G S--Band
G U-Band
G E-Band
Cyclic AWGs allow routing of several wavelengths to common ports
Does not increase insertion loss
Can be made athermal (outdoor installation)
ITU grid (e.g., 100 GHz) only in one cyclic filter order

16. N:M AWGs l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l
m Waveguides with constant
Length (Phase) Difference
Phase Shifter
FPR
FPR l l l l l l l l 1a 2a 3a 4a 1a 4b 3c 2d l l l l l l l l
Free Propagation Region 1b 2b 3b 4b 2a 1b 4c 3d l l l l l l l l 1c 2c 3c 4c 3a 2b 1c 4d l l
The array waveguide is essentially a multistage, multi cross-connect wavelength coupler. The delay lines between the two sides cause different phase shifts for different wavelength and therefore different wavelengths from one input appear at different outputs.
By coupling each input to all outputs and controlling the characteristics of the coupling, a wavelength at any input can be coupled to a selected outputs. This structure is also known as an MxN multiplexer (or demultiplexer is used in the opposite direction).
Other names found in the literature: Phase array, phaser, Dragone router l l l l l l 1d 2d 3d 4d 4a 3b 2c 1d
Rows …
... translate into …
... columns

17. Operational Aspects, enabled by CAWGRN
AWG
OLT
U-Band
OTDR …
TRX
Array incl.
L/U
ONU
Passive LT
(U-Band
Reflector)
Non-service-affecting OTDR monitoring with unambiguous results
Low-cost passive Line Termination (LT)
2:N AWG …
TRX
Array 1
Array 2
OLT RN
ONU
Cyclic 2:N AWGs allow low-cost feeder-fiber protection
No added insertion loss, protection by tuning (see previous slide)

18. Thank you KGrobe@ADVAoptical.com IMPORTANT NOTICE
The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited.
The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation.
Copyright © for the entire content of this presentation: ADVA Optical Networking.