1.
Open optical edge connecting mobile access networks
Jim Zou, global business development
ECOC 2022 WS: Moving from optical components in RAN to optical components for RAN

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2
Optical fiber connectivity is the key to flexible capacity growth
Fixed X-haul transport for 5G RAN
Microwave Fiber Copper
?
RU 5GC
Backhaul
Carrier Ethernet
(NG/Xn, S1/X2)
Midhaul
Ethernet
(F1)
Fronthaul
eCPRI/Eth
(Fx)
DU CU
40-200 km
<10 ms
20-40 km
1-2 ms
0-10 km
25-200 µs
Source: O-RAN Alliance
1 2 4 8 16
Fx: 100MHz Sub6G 2.0 3.9 7.8 15.6 31.2
F1: 100MHz Sub6G 0.5 1.0 2.0 4.0 8.1
0.0
10.0
20.0
30.0
40.0
Bandwidth
in
Gb/s
MIMO layers
Single sector DL transport bandwidth (peak)
Peak
Average

3.
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• C-band vs O-band
• Fixed vs tunable
• Dark fibers
• CWDM vs DWDM
• TDM vs FDM
• DML, EML, MZM, …
• NRZ, PAM-x, DMT, CAP, …
• IM/DD vs coherent
• Advanced modulation formats
• Equalization, shaping, EDC, …
• FEC
What are the optical layer options?
Transmission technologies
Wavelength windows
Parallelism
Modulation
(Digital) signal processing
A pragmatic approach is needed between cost and performance

4.
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4
?
Direct-detect 10G
Direct-detect 25G
Coherent 400G
What’s next?
Optical transmission evolution
Coherent Edge 100G
Longer reach
Higher performance
Lower reach
Lower complexity and cheaper
Core
DU
Backhaul
Midhaul
Fronthaul
RU CU
?

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Close the gap between IM/DD and coherent
For optical edge/access interface
Purpose-built solutions
PAM-4 25G Coherent 100G

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Important aspects of RAN deployments
Power
consumption
Industrial
temperature
Module
cost
Module
latency
-40°C
+85°C
25G
Direct Detect
“Coherent slicing”
not viable
3W max Achievable Cost-effective
Minor KR4-
FEC latency
100ZR
Coherent
5-6W max Achievable
Relatively
Expensive
Optimized latency
through DSP/FEC
Too high-power consumption for SFP28 or even QSFP28
QSFP-DD/CFPx inefficient and expensive for only 25G-100G

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Summary
Edge access Edge aggregation
Access always appreciates a simple and cost-efficient solution
DWDM
multiplexer
DWDM
multiplexer
Nx25Gbit/s
PAM4 DWDM
25Gbit/s
wavelengths
100Gbit/s
wavelengths
…
Headend
Nx100Gbit/s
Coherent DWDM
DU/Router/
CCAP/ …
…
…
Mobile
access
Broadband
access
Business
services
RPD
RU
Coherent 100ZR
Direct-detection Coherent-detection
PAM-4 25G

8.
Thank you
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jzou@adva.com