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

Content Passive WDM WDM-PON

Passive WDM

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

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

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

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, …)

The Smart T-XFP TX MSA-compatible XFP RX Tune µC TX From and to Host Out In 1k 10k 100k 1M 10M 10G 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

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

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

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

WDM-PON

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

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)

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.698.3 C-Band G.698.3 S+-Band G.698.3 L-Band G.698.3 S--Band G.698.3 U-Band G.698.3 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

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

Operational Aspects, enabled by CAWG RN 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)

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