The coherent optical edge
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The document discusses the shift towards using coherent optical technology at the network edge. It argues that 100G QSFP28 ports using coherent 100ZR technology will dominate the optical edge in the coming years. This will allow for longer transmission reaches of over 300km compared to traditional direct detection. Key advantages of coherent 100ZR include lower power consumption of 5W or less in a QSFP28 form factor, simplified deployment without manual tuning, and compatibility with existing network infrastructure. The technology could enable seamless upgrades to 100G speeds at aggregation points across access networks.
![© 2022 ADVA. All rights reserved.
10
Coherent 100ZR
The QSFP28 power challenge
7nm DSP
ADC
DAC
Rx
Tx
Laser
400G ZR+
100G ZR+
SteelertonTM
ADC
DAC
Rx
Tx
Laser
100G ZR+
7nm DSP
ADC
DAC
Rx
Tx
Laser
100G ZR+
400G DSP re-use
(hypothetical)
7nm DSP
ADC
DAC
Rx
Tx
Laser
400G module re-use
(hypothetical)
<1000
<1500
<2000
<3000
<4000
<6000
<8000
>8000
Power [mW]
20W
13W
5W
Plug power consumption
QSFP56-DD
QSFP28
11W
SteelertonTM DSP
An ADVA II-VI co-development](https://image.slidesharecdn.com/220803-thecoherentopticaledge-srettenberger-220812155611-3f03d8ef/85/The-coherent-optical-edge-10-320.jpg)
The coherent optical edge
- 1. The coherent optical edge Stephan Rettenberger, June 2022 A paradigm shift for scaling aggregation networks
- 2. © 2022 ADVA. All rights reserved. 2 Where is the optical edge? Communication service provider network applications From the first active aggregation point into the regional network DSL-HG PON-HG BNG CCAP RU PGW DU CU Edge aggregation CM MSAN OLT RPD HUB BBU RN Broadband access DSL or PON Broadband access Cable Mobile access LTE or 5G Access Fiber Copper
- 3. © 2022 ADVA. All rights reserved. 3 100G (QSFP28) is going to be the dominant feeder port at the optical edge Broadband access DSL or PON Broadband access Cable Mobile access LTE or 5G RPD-HUB BBU or DU CSG MSAN OLT TA5000 Application Typical uplink BW per node Network element Example Cable OS Airscale 10G 100G 400G today 10G 100G 400G today 10G 100G 400G today +3years +3years +3years Line speeds at the optical edge Network element evolution
- 4. © 2022 ADVA. All rights reserved. 4 Transceiver technologies for the edge Direct-detect versus coherent Low-cost, low-power solutions hardened for outdoor will make it to the edge ONU CO OLT Edge Access • Direct modulation with high rates is massively reach-limited by optical dispersion • Coherent interfaces will push direct modulation into specific short-reach use cases • ER4 (40km) and ZR4 (80km) are very expensive options for reach extension of 100GE ports 50baud PAM4 dispersion tolerance Direct-detect PAM4 Coherent QPSK Outdoor cabinet Outdoor cabinet Controlled environment Coherent evolution Core
- 5. © 2022 ADVA. All rights reserved. 5 Technology trends at the network edge Adoption of coherent pluggable optics that can be plugged directly into the application device (e.g., OLT, CCAP, DU, switches and routers) QSFP28 universal form factor for 100GbE ports Hardened temperature components for outdoor deployments Source: Cignal AI, 2021 How can 100G coherent technology transform the optical edge?
- 6. © 2022 ADVA. All rights reserved. Confidential. A paradigm shift for the edge Coherent 100ZR
- 7. © 2022 ADVA. All rights reserved. 7 Economics of coherent WDM interfaces Cost per port Cost per bit Traditional 100G 200G 400G Format • During the last decade every new generation of coherent interface came with an increased data rate • Assuming a 100% utilization of the interface bandwidth this results in a strong reduction of cost per bit Coherent optical interface evolution 2010- Industry design cycle 2015- 2020- Edge applications do not benefit from further increase of interface bandwidth
- 8. © 2022 ADVA. All rights reserved. 8 A new breed of coherent optics for the edge 7nm DSP technology, simple modulation, low baudrates Cost per port Cost per bit Traditional 100G 200G 400G Modulation format • Millions of access tails at 10GE (SFP+) need high-speed upgrades • 100GE (QSFP28) ports will dominate • 100ZR plug needs optimized price- performance to substitute WDM 10G in volume deployments State of the art technologies to reduce power and cost 2010- 2015- 2020- Coherent 100ZR 2022 QSFP28 100ZR closes the gap between traditional direct-detect (10G) and coherent
- 9. © 2022 ADVA. All rights reserved. 9 Coherent 100ZR and QSFP28 Jumping off the hyperscale curve • Historically interface evolution has been driven by carrier requirements from LH → regional → metro → access • Today DCI hyperscale requirements drive high-speed innovation • Success of coherent technology at the network edge requires continuation of carrier path • Low power, iTEMP support and a cost per port that is more comparable with 10G scaling rules is key 100T 50T 200T 1.6T 800G 3.2T 100W 10W 1W 90W 45W 32W 24W 25W 20W 5W Power consumption Regional & Metro Edge Hyperscale DCI OSFP-XD QSFP-DD QSFP-DD CFP2 CFP MSA gen1 MSA gen2 QSFP28 Carriers Low-power and iTEMP Time 30W Drive proven innovation curvet to bring coherent technology to the edge
- 10. © 2022 ADVA. All rights reserved. 10 Coherent 100ZR The QSFP28 power challenge 7nm DSP ADC DAC Rx Tx Laser 400G ZR+ 100G ZR+ SteelertonTM ADC DAC Rx Tx Laser 100G ZR+ 7nm DSP ADC DAC Rx Tx Laser 100G ZR+ 400G DSP re-use (hypothetical) 7nm DSP ADC DAC Rx Tx Laser 400G module re-use (hypothetical) <1000 <1500 <2000 <3000 <4000 <6000 <8000 >8000 Power [mW] 20W 13W 5W Plug power consumption QSFP56-DD QSFP28 11W SteelertonTM DSP An ADVA II-VI co-development
- 11. © 2022 ADVA. All rights reserved. 11 Just imagine what you could do with … 100ZR coherent technology in a 5 Watts power envelope • 100GBASE-ZR compliant with IEEE Std 802.3ct™‐2021 • QSFP28 form factor and power envelope • OTN OTU4 and Ethernet 100GE host interface options • 300km amplified reach (CD compensation) • 100GHz/50GHz/Flexgrid resolution • Fully tunable (remote tuning) • Versions for cTEMP and iTEMP Radically new DSP innovation creates industry’s lowest-power coherent 100ZR plug
- 12. © 2022 ADVA. All rights reserved. 12 Host agnostic The self-tuning algorithm is host agnostic and can operate in any standard QSFP28 slot without manual intervention No commissioning or manual intervention When the 100ZR modules are inserted into the corresponding ports, both modules automatically start the automatic tuning process, and tune to the wavelength determined by the DWDM filter (probe and detect) Industry-first wavelength auto-tuning simplifies operation and minimizes inventory What about ease-of-use? Minimum inventory Coherent 100ZR pluggables are fully C-Band tunable ... Ensemble Controller Headend Spoke1 Spoke2 FOADM FOADM tunable receiver … λ1 λ17 λ2 λ3 tunable transmitter … λ1 λ17 λ2 λ3 Rx Tx LO Lambda sweep Uni-directional Lambda-tuning
- 13. © 2022 ADVA. All rights reserved. 13 Innovative schemes emerging Coherent technology choices at the edge Subcarrier technology • Single HUB interface, but proprietary formats • Sub-carriers not compatible with ITU-T l-grid • Penalties due to weak isolation, high constellation • Permanent feedback loops needed for power balancing and center-frequency control Splitter-based OLS HUB-side 4x100G 16QAM 400G 16QAM Sub-carriers P-T-MP subcarriers ROADM or splitter-based OLS 4x100G QPSK EDGE-side Wavelengths 4x100G QPSK Coherent 100ZR • Standard coherent modulation format • Optical routing, any-to-any, standard OLS • Robust transmission, can potentially go over multiple OLS domains P-T-P wavelengths Classical l-routing is the more robust approach feedback loop
- 14. © 2022 ADVA. All rights reserved. 14 Coherent 100ZR A paradigm shift for the optical edge ADVA’s FSP 3000 or third-party open terminals and OLS ADVA’s FSP 3000 or third-party open line system (OLS) Broadband access <100G (direct-detect) 400G (coherent) Mobile access 100G (coherent) Edge aggregation Edge access Core Open line system HUB Business services CCAP 100ZR Fronthaul DU RU 100ZR HFC RPD 100ZR FTTH ODN OLT 100ZR IP Router 100ZR QSFP28 enables seamless introduction of 100G coherent waves at the edge Legend:
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