Perspectives of Beyond 100G

Yiran Ma

China Telecom

Outline

The driven force of large pipe

100G

Beyond 100G

Transport SDN

Driven by IP and Broadband Traffic

Increase of IP traffic:

Global CAGR: 23%

2015: Enter ZB era (Z: 1021)

China CAGR: >35%

Increase of Users:

CT fixed BB users: reach 100M in 2013, CAGR>40%

Bandwidth per user: typically 4M, increase to 20~100M

Driven by “Broadband China”

Broadband China—National Strategy Targeted for 2015 and 2020

End of 2015 Fixed BB Penetration:>50% Fixed BB bandwidth: 4Mbps in rural area; 20Mbps in urban area; 100Mbps in large cities Mobile BB (3G/LTE) Penetration: >32.5% BB(Fixed or Mobile) coverage: 95%

End of 2020 Fixed BB Penetration:>70% Fixed BB bandwidth: 12Mbps in rural area; 50Mbps in urban area; 1Gbps in large cities Mobile BB (3G/LTE) Penetration: >85% BB(Fixed or Mobile) coverage: 98%

Driven by Emerging Services

Data Center Interconnect(DCI) Cloud computing dramatically increases the status of DC in the Internet infrastructure Carrier’s DCs: Change the network topology ISP’s DCs: Explosive traffic/bandwidth requirements ISPs tend to establish their own WDM networks

Financial and Exchange Industry Desire for low latency transmission Cost insensitive: time is gold Bigger pipe means quicker transmission and coherent promises more

Outline

The driven force of large pipe

100G

Beyond 100G

Transport SDN

What technology for 100G—Coherent PM-QPSK

Transmitter PM ½ bit-rate QPSK ¼ bit-rate Reduce the performance

requirements on components and systems

Receiver Coherent receiver with local

oscillator(LD) ADC is a key component Transfer the complexity to electrical

domain (DSP) : CD/PMD compensation, time/phase recovery, etc.

100G optical coherent transmission technology is a milestone in the history of optical fiber communications

Unified solution collects the efforts from whole industry, accelerate the commercialization

Outline

The driven force of large pipe

100G

Beyond 100G

Transport SDN

What’s beyond 100G?

200G Single carrier: PM-16QAM(32Gbaud), PM-QPSK(64Gbaud) Pros: Promising lower cost vs. 2*100G Cons: No 200G client

400G Most likely because IEEE chooses 400GE Single carrier is possible but performance is poor: PM-16QAM(64Gbaud) Multi carriers are recommended as a commercial solution

1T(1000G) Definitely multi carriers, higher spectral efficiency required Super channel : OFDM, Nyquist WDM

What technology for 100G+ ?

Inherited from 100G Polarization multiplexing(PM) Coherent detection

Developed based on 100G Higher order modulation Higher gain FEC

New Technology Super Channel

Multi-Carriers WDM Nyquist WDM OFDM

Comparison of 100G+ transmission solutions

200G 400G 1T

Modulation Format

PM-16QA

M

PM-QPSK

PM-16QA

M

2SC PM-

16QAM

4SC PM-

QPSK

10SC PM-

QPSK

5SC PM-

16QAM

5SC PM-

QPSK OFDM

Baud-rate 32G 64G 64G 32G 32G 32G 32G 64G N/A

# of carriers 1 1 2 2 4 10 5 5 N/A

Nyquist shaping N N N Y Y Y Y Y N

Distance (km) ~500 >1000 <200 ~500 >1500 >1500 ~500 >1000 >1000

Maturity *** ** ** *** **** **** *** ** *

Chip set R N N R R R R N N

Development of fiber technology

Evolution based on SMF Reducing loss: LL(Low Loss), and ULL(Ultra Low Loss) Expanding core area: Introduce G.654 fiber into terrestrial WDM systems

New fiber (FMF, MCF)

China Telecom’s trial 1T Nyquist WDM real-time system, 24 hours error free Four type of fibers comparison: G.652 SMF/LL/ULL, G.654 2000km(20*100) with 1.7~3.0dB Q margin in different fibers 3200km(32*100) mixed G.652 ULL/LL fibers with 1.2dB Q margin

Outline

The driven force of large pipe

100G

Beyond 100G

Transport SDN

RRU

RRU

RRU

BBU

CPRI

Controller

North: Open API

Third party APP

IP/DC controller

APP China Telecom Cloud

Enterprise

MPLS

OTN

λ

MPLS

OTN

λ

Central cloud

CR

DC

South：Control

OLT ETH/

MPLS

OTN

Aggregation Metro Core

East/West：Cooperation

Considered Structure of Transport SDN

Through south bound interface, optimize and control transport network from end to end

Through east/west bound interface , cooperate with other controllers to decrease TCO

Through north bound interface, accommodate various applications

From manual and static configuration to real-time dynamic configuration

Global optimization of network resource to avoid conflict

Automatic OAM: fast service provision, online service analysis, resource

occupation alarm

Use Case：Increase OAM Capability

GMPLS/OF

GMPLS/OF GMPLS/OF

T-SDN Controller

Openflow

网络服务

PCE+

PCEP+

North API

OpenFlow

Service East/WestNMS

Use Case：Multi-vendor/domain Enhance networking through standard open interface

Now：Hierarchical SDN controllers with multi-domain controller over vendor controllers

Future：Standardization of network element interface. Control directly!

Scenarios：

OTN network with multi-vendor access

Core OTN/WDM network with multi-vendor and multi-domain networking

controllerEMS

A Subnet B Subnet

DCN DCN

controllerEMS

CDPI CDPI

Multi-domain controller

CVNI CVNI

API CVNI

APPUser

controllerAPI

APP

Qx Qx

CVNI: Control Virtual Network InterfaceCDPI: Control Data Plane Interface

Use Case：New Services

Transport Network

Controller

DC Controller

User A Controller

User B Controller

3rd party applications , such as intelligent leased line and virtual operation

Intelligent leased line

Adjustment of leased line bandwidth by users: self-adjust through portals or automatic setting

Virtual transport services（VTS）

Virtualized transport network for enterprise users and virtual operators

Customized network control and management for enterprise users

High Capacity Transmission is the Physical foundation of information society!