I have had a lot of requests for the presentation I gave at SCTE on Coherent Access Applications for MSOs. So here it is.

1. © 2018 SCTE•ISBE and NCTA. All rights reserved. | scte.org • isbe.org 1
W I R E L I N E A C C E S S S E R V I C E S
Harj Ghuman, David Job
Cox Communications
COHERENT ACCESS
APPLICATIONS FOR MSO

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1. What is Coherent Optics?
2. OCML – MDM Network
3. Coherent & 10G Coexistence Tests with OCML
4. Coherent Access Applications
5. Summary
Agenda

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Coherent and 10G NRZ Comparison
Coherent
• High Capacity, 100G to 600G per WL
• Phase modulation
• Dual polarizations
• Advanced DSP & FEC - Improved OSNR tolerance
Direct Detection
• 10G NRZ uses intensity modulation:
• Chromatic dispersion, Noise from lasers,
EDFAs & detectors
• Higher Rx , shorter links & data rates (10G)

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2010 2013 2017
Performance &
Flexibility
100G
2019
200G
400G
600G
1 TB in Lab
64 QAM
128 Gbaud
Coherent Deployment Timeline
OFC
2008

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Modulation, Reach and Capacity Tradeoff
400G 16QAM
200G 16QAM
200G 8QAM
100G QPSK
Capacity
Reach
600G 64QAM

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Coherent Modulation, Grid & OSNR
• Bits/symbol:(QPSK = 2, 8QAM = 3, 16QAM = 4)
• Bits/symbol*Baud rate = Raw data rate
Data Rate
(Gbps)
Modulation
Baud
Symbol Rate
(Gbaud)
Minimum
Grid GHz
OSNR (dB)
10-15
Post
FEC
100G DP-QPSK 32 50 12
200G DP-QPSK 64 100 16
200G DP-8QAM 42 50 18
200G DP-16QAM 32 50 20
400G DP-16QAM 64 100 25
Assumes Soft decision FEC, 10.8 - 11.3 dB NCG, BOL measurements

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• Coherent equipment performance depends on:
• DSP, SD FEC (NCG), modulation
• Tx - Modulators (LiNbO3 MZM), laser linewidth, built in EDFA
• Rx sensitivity
• Coherent equipment types used in Cox tests:
• Equip. A: Long haul - 100G QPSK & 200G 8/16 QAM
• Equip. B: Metro/Access - 200G 16 QAM (CFP2-ACOs)
Coherent Equipment Types

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Driver
TIA
DP I/Q
Modulator
Integrated
hybrid + PDs
Tx Signal
Rx Signal
Digital Signal
Processor
Uni-Direction And BiDi Coherent Transport
Uni-directional
Two Fibers
Driver
TIA
DP I/Q
Modulator
Integrated
hybrid + PDs
Tx Signal
Rx Signal
Digital Signal
Processor
Bi-directional
Single Fiber
WDM Or
Circulator
Laser
Laser
Laser
ʎA
ʎA
ʎA
ʎB

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OCML – MDM Network
Optical Communications Module Link-extender (OCML) Mux DeMux (MDM)

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10G & Coherent Coexistence
Technical Issues
• 10G greater power density than 100G
- Alters refractive index of fiber
- Can cause SPM & XPM
• Impact on Coherent
- XPM from 10G impacts reach
- DCM can impair Coherent signals
10

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Coherent and 10G Coexistence - Test Set-Up
17 X 10G, DS & US
Primary Fiber
48port
10GbESwitch
100GUS
100GDS
Secondary Fiber
VOA
5 km
40 / 60 km
MDM
Coherent
Eqpt A
TrafficGenerator
ITU 26
ITU 50
ITU 35
ITU 59
ITU 35
ITU 59
Coherent
Eqpt B
ITU 19
ITU 43
100G
200G
200G
100GbETraffic
Generator
48port
10GbESwitch
100GDS
100G US
100G DS
100GUS
Coherent
Eqpt A
Coherent
Eqpt B
ITU 19
ITU 43
17 X 10G, DS & US
ITU 26
ITU 50
OCML
Mux/Demux
10GUS
10GDS
10GUS
10GDS
200G
100G
200G
10G US/DS
Notes:
· Coherent Equipment A was high
performance (long haul)
· Coherent Equipment B was lower cost
(Access optimized)
· Variable Optical Attenuator (VOA) was
adjusted to determine Link Margin

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Coherent and 10G Coexistence – Test Wavelengths
100 GHz Grid
B: CFP2ACO
200G 16 QAM
200G 8 QAM 200G16 QAM100G QPSK10G
A: Long Haul

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Coherent & 10G Coexistence – Test Results
Link Margin (dB) = optical attenuation added to the 40 / 60 km links before onset of uncorrectable errors
Link Margin
Legend
NRZ 10G
Coherent Eqpt A 100G - QPSK
Coherent Eqpt A 200G - 8QAM
Coherent Eqpt A 200G - 16QAM
Coherent Eqpt B 200G - 16QAM 2.7
8.5
10
16
6.5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
60 km Link Margin (dB)
5.5
12
19.5
10
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
40 km Link Margin (dB)
not tested
DCM Present

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Converged Access Network

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OCML - MDM:
• 100G/200G - High
capacity applications
• 100/200G to cabinet
• Mux, Switch, Router
• Multiple 10G & 1 G
• Business services
Coherent Business Services

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Hub Consolidation
Hub A Collapse
• OCMLs + Muxponder
• 200G DWDM optical
trunk to Master HE
• Hub A collapsed
D
W
D
M
M
U
X
P
O
N
D
E
R
OCML
OCML
OCML
OCML
λ1
200G
20 X 10G
Multi200Gλ
λ2
λ2
λ2
Hub
80 X 10G
X
DWDM
RPD
RPD
20 X 10G
20 X 10G
CABINET/HUT
DWDM
RPD
RPD
Hub
Hub
Hub
Master
Headend
HUB A

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• Coherent solutions are making their way into Access
• We demonstrated bi-directional Coherent 100G/200G
& 10G NRZ over 60 km
• Several Access Coherent solutions presented
• OCML - MDM is a proven, scalable platform to
transport 10G and Coherent signals for Access
Summary

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Harj Ghuman
Harj.ghuman@cox.com
David Job
David.job@cox.com
Thank You!

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Coherent and 10G Coexistence – Test Wavelengths
100 GHz Grid
Mixed 10G/Coherent 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 DS
Test Condition 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 US
Load 1, on 40km & 60km
Load 2, on 60km
Legend
NRZ 10G
Coherent Eqpt A 100G - QPSK Notes:
Coherent Eqpt A 200G - 8QAM All tests with 60km fiber link used an OCML with integrated DCM
Coherent Eqpt A 200G - 16QAM All tests with 40km fiber link used an OCML without integrated DCM
Coherent Eqpt B 200G - 16QAM
C-Band DWDM ITU Ch Pairs

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Converged Access Network
5 – 60km
MDM
Transport
Chassis
Coherent
Agg. Router
Access
10G DWDM
Coherent 100G/200G/400G
RPHY Shelf
Multiple RPDs
Aggregation
Device
OCML
10G
CCAP Agg. Switch
Coherent
10G
Agg. Router
100G/200G/400G
1
x
n
OLT
RPD10G
RPD10G
1
x
n
RPD10G
RPD10G
MDU
Enterprise
5G
100G/200G/400G