ROADM/OXC and Related

Technologies/Standards:

Enabling More Agile and Open

Optical Network

Ning Deng

Optical Networks Technology & Standards

2

Outline

Industry trends and ROADM/OXC status Recent technology and solution advancement Towards more agile and open optical networking

3

Cloud Era is Coming

• East-West traffic (between DCs) will grow 4 times by 2020 • Traffic within DC will grow 3 times by 2020

Ultra-large DCs around the World

Up to 2016, there are 9027 ultra-large data centers around the world, and much more for large and medium data centers. Source：Datacentermap.

4

“Clouds” Need to Be Networked

Network

What “Network” Do “Clouds” Need?

Cloud

Network

Requirement of “Cloud”

Service adjustment is fast

and dynamic.

Latency between DCs is

low

How does “network” match

Flexible, quick response/reconfig

Shorter route;

Lower-latency node

5

5G Transport Relies Heavily on High-performance DC Interconnected Network

Ultra Low Latency Large Bandwidth ms / 10ms level E2E latency, 1~2ms one-way for bearer network

1-hop to DC

Network Slicing

Different SLA to support uRLLC service, including hard pipe, ultra low latency

• Bearer (transport) network between NB and EPC

• Bandwidth Nx10M~1Gbps per NB

Internet

EPC

Cloud BB

RRU

4G Network

RRU eNB

eNB eNB

Internet

5G Network

New Core

RRU RRU RRU RRU gNB

• MCE/MEC/New Core are based on DC/Cloud

• Bandwidth 10G+ per 5G gNB

Cloud BB Cloud BB

gNB gNB

Cloud MCE/MEC MCE/MEC MCE/MEC

Wireless Evo

lutio

n

Fronthaul: 100G per node

Backhaul: 10G+ BW per node

WDM for capacity upgrade

New core DC

Edge DC

6

7

Shortest Path and L0 Pass-through Lead to Lowest Latency

①One hop between sites

(shorter path)

②Least pass-through sites L1

L0

L2

L1

L0

L2

③Lowest added latency

of pass-through sites

L2 latency: nx100us

L1 latency: nx10 us

L0 latency: n us

Mesh connection, one hop transmission, optical (L0) pass-through lead to the lowest latency.

8

①Before clock X, 500G service

from DC1 to DC2

②After clock X, the 500G service

change to from DC1 to DC3

③Then clock Y, the 500G service

change to from DC1 to DC4

DC1 DC2

DC3 DC4

To realize the fast adjustment, cross-connect function is a must.

"Cloud" resource updates

will lead to rapid changes in

traffic among DCs

Cross-connect Is the Foundation of Fast Provisioning

9

Today’s Multi-Degree (MD) ROADM for Optical XC (Cross

connect) Needs

MD-ROADM

#2

MD-ROADM #6

MD-ROADM #5

MD-ROADM #4

MD-ROADM #3

MD-ROADM #1

Line-side XC

Local add/drop

10

(MD) ROADM Industry & Market Situation

Source: IHS Markit, Ovum

USD (M)

Global broad ROADM equipment market momentum

$0

$1,000

$2,000

$3,000

$4,000

$5,000

$6,000

2011 2012 2013 2014 2015 2016

Report1

Report2

NA

EMEA

AP

SCA

-

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

180,000

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022

Wavelength Selective Switches, Unit Sales

Source: Light Counting

Global WSS shipment and prediction

11

(MD) ROADM Industry Applications – CTC

China’s first large-scale ROADM network

• Mesh networking across 6 major provinces in East

China, 20+ nodes

• High degrees (3~8 directions)

• Intelligent optical layer restoration via WSON

Advanced technologies adopted

• Route & select architecture was used

• CD architecture mostly used with multiple add/drop

modules, CDC complementary

• Twin WSS’s were widely used, mostly 1x20 WSS’s

Courtesy of

12

(MD) ROADM Industry Applications – CMCC

For transport node, in favour of OTN matrix + ROADM/OXC

• Capacity for one node > 64T

• Optical+electrical layers fulfill restoration req.

• Optical layer bypass reduces latency.

• can auto 3R or WC by the control plane.

Courtesy of

Shanghai

Hangzhou

Nanjing Field Trial in Yangtze River Delta

13

Outline

Industry trends and ROADM/OXC status Recent technology and solution advancement Towards more agile and open optical networking

14

Recent Technology/Solution Advancement

• 1xN (N>30) WSS for line side

• Mesh networking

• One slot, one direction

• In future, NxN WXC

• MxK adWSS for add and

drop side

• Low loss, eliminating

hundreds of OAs

• Optical backplane instead of

messy fiber connections

• Eliminating hundreds of

manual fiber connections

• Embedded optical monitoring

inside the OXC

Source: http://www.on2020.org/files/ON2020_Next-Gen%20ROADM%20and%20OXC.pdf

15

Recent Technology/Solution Advancement

Sub-GHz optical spectrum monitoring

High port count, high resolution WSS

• 3.125 GHz tuning

granularity

• Intra-channel

attenuation control

for optical

equalization

Some pictures, information Courtesy of

MxK WSS for CDC add/drop

……

……

……

……

……

……

DIn

D1 D2 D3 D4 D5 Dm Dn

OXC+EXC synergy and complete performance

• Advanced optical

channel / spectrum

monitoring for the

use of OXC /

superchannel

• Well-complementary

OXC and EXC for full

service

• Complete visibility

and management of

performance: port,

connection, fiber, ,

power, OSNR, etc.

16

Outline

Industry trends and ROADM/OXC status Recent technology and solution advancement Towards more agile, reliable and open optical networking

17

ROADM/OXC and Related Technologies Offer Opportunity to

Achieve Better Optical Networking (L0 Networking)

Agile / Dynamic

PO

Resource

survey

Resource

ready

provisioning

Finish

Hardware in

warehouse

Delivery

Installation

&commission

Purchase

equipments

1 day

3 day

30~60 day

2~3 day

2~3 day

Yes

Yes

No No

Case 1

Case2

Case3

Today’s service delivering time analysis

Takes usually week(s), sometimes month(s)

Expectation from network operators: Minute(s)

How?

Today’s λ service Delivering Time

How to reach the target of 1 minute

(λ)

Case1 Days-1 week Reconfigurable + Automatic

Case2 1-2 weeks Resource Pooling / sharing + Automatic

Case3 1~2 Months

node #2

node

#N

To node #1

node #3

N×N SW &Add/drop

Optical layer visibility (optical

monitoring, telemetry, data

analysis, enhanced OAM)

Effective management and

control interface (TSDN, …)

18

19

Industry Standards Efforts Towards Agile and Open Networking

1 OTN L1 logical 100G&beyond Q11 / SG15

2 OTN OAM, protection Q11, Q9 / SG15

3 DWDM 100G interworking Q6 / SG15

4 ROADM, optical monitoring Q7, Q6 / SG15

5 L0 networking control CCAMP, TEAS, …

6 L0 networking (WTN) model Q12, Q14 / SG15

7 L0 OAM, interface, prot., etc. Q11, Q9, … / SG15

1

2

2

3

3

5

4

WDM Transport Network (WTN)

Ethernet OTN FlexOTN

WDM Channel layer WDM Section layers

WTN Clients HD-FEC frame, or SD-FEC frame+DSP frame “Adaptation layer”

WTN layer networks

Agile: adding/enhancing standards for ROADM/OXC,

optical layer monitoring/awareness, optical OAM, automatic

path setup/restoration, etc.

Open: launching optical layer (L0) networking framework,

i.e. a WDM transport network (WTN), open for all clients

Existing and forthcoming efforts:

L0 OAM

L0

Networking

/ WTN

Optical Link (OXC, OA, …) Architecture

L0 Control

Optical

interface

4

6

7

7

20

Summary

Cloud era brings the need of enhanced agile L0 optical networking

Huge capacity, meshed networking, dynamic bandwidth, low latency

next generation OXC for L0 networking

NG OXC greatly enhances MD-ROADM by

• high-degree & compact line side WSS,

• MxK add drop WSS,

• optical backplane,

• embedded monitoring, etc.

Start of standardization of WTN facilitates agile and open L0 networking

Thank you