47pt Technology Advancements and Network Applications for ... Focus 2011... · Technology Advancements and Network Applications for Optical Burst Transport Networks HUAWEI TECHNOLOGIES

47pt

Kent Jordan

Technology Advancements and Network Applications for Optical Burst Transport Networks

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Kent Jordan

Sr. Manager Optical Network Marketing

Huawei Technologies

Agenda

• Optical Burst technologies� Technology viability � Potential Benefits� Scalability

• Applications� Metro to Core aggregation� PON-like data services� Next-generation intra-data center switching

Huawei Optical Networks Research

� Next-generation intra-data center switching� Low latency metro access� Content delivery

• Summary and Q&A

Optical Burst Transport Network Viability

• Many implementations of OBS/OPS require fast, flexible optical buffers, and complicated scheduling to guarantee switching performance

• Huawei has adopted a novel approach to Optical Burst technology called Optical Burst Transport Network or OBTN which minimizes dependencies on complex optical components

WDM + OTN + Switch OPS / OBS OBTN

Number of Layers 3 1 1

Number of Transponders High Greatly reduced Greatly reduced

Huawei Optical Networks Research Page 3

Electrical XC / Switch Large Greatly reduced Greatly reduced

Photonic Components Low Requirements Very High Requirements Medium-High Requirements

Flexible Optical Buffer N/A Large / Many, FDL arrays are feasible but scalability is an issue

None

Burst Mode Transceiver N/A 10Gbps is available, scalability to 100G is challenging

Scalable to 100G+

Fast Optical Burst Selector N/A Small scale Fast optical switches are available. Larger scale fast optical switches or fast tunable optical filters on the horizon

Optical Burst Amplification N/A May be challenging for multi-wavelength signals

Simplified design, manyoptions, feasible today

Near-term Viability Deployed today Poor Good

Layer Convergence

O/E E/O

E/O O/E

O/E E/O

ROADM

OTN XC

Switch

O/E E/O

E/O O/E

O/E E/O

ROADM

OTN XC

Switch

O/E E/O

E/O O/E

O/E E/O

ROADM

OTN XC

Switch

L0

L1

L2

• Current optical networks utilize λ-granularity switching at L0 (optical layer) and rely on L1 and L2 for aggregation / grooming / switching of sub-λ traffic


Fast optical switch

Fast optical switch

Fast optical switch

NGWDMROADM

NGWDMROADM

NGWDMROADML0

Unified L0&L1&L2

• OBTN facilitates sub-λ burst switching and reduces costly O/E/O conversion and hidden costs due to layer transitions

Compatibility with Current WDM/OTN Networks

• OBTN can co-exist or be co-deployed with WDM/OTN networks� Supports fixed-wavelength transmitters (FTx) and does not require fast

Tunable Tx� Works across existing line amplifiers, ROADMs, etc.

(R)OADM

WDM/OTN

WDM/OTN

Burst ADMCards can be deployed in the same physical shelf

Same physical infrastructureDifferent logical


• OBTN may also share the same networking architecture with OTN to enable all-optical multiplexing and cross connection of ODUs

Page 5

OTN line card

OTN line card

OBTN line card

OBTN line card

same physical shelfDifferent logical networks

OCh

OTU

k

HO

OD

Uk

LO ODU

LO ODU

LO ODUTraditional

OTN OCh

OTU

OB Channel

OTU

OB Channel

OTU

OB ChannelOBTN

OBTN Scalability

OB

TN

Lin

e R

ate

10G 40G 100G

400G

1TOBTN technology has been demonstrated at 10Gbps line

rates, and exhibits scalability to 100Gbps and beyond

OFC 2011


OFC 2011

OB

TN

Dis

tanc

e

<50km 100km 500km

OBTN technology scales to access and metro distances, but can be applied to LH and

ULH technologies in the future

1000km+

1000km

Access and Metro Network Applications

Metro-Access

� Facilitates high-BW access to end-users / businesses

� Long reach (100 km), wide coverage (>1000 users) via WDM+TDMA

Metro-Aggregation

� Decreases no. of transponders and network latency

�Simple upgrade to higher line rates

Metro-Core

� Supports distributed services, realizes sub-wavelength bypass

� Reduces capacity and power constraints of core routers / electrical switches

Star topology Ring topology Mesh topology


BRAS/BAS/

MSE/BNG RouterMSAN

Metro Aggregation and Access Applications

3 4 2 4

23 4 4

4 3 3 1

3 4 43 34 1

4 1

MUX/DEMUX

OA

Central Office

Splitter

2 2

1 11 2 1 2

12

3 3

1 2 3 3

OA

TDMA

WDM

Metro Ring Aggregation PON-like Access for Business Services

Node 1

Node 2

Node 3

Node 4


• Optical burst ring with multi-granularity flexible bandwidth provisioning and dynamic bandwidth allocation

� Supports sub-λ and λ granularity services� Supports multiple service types

� Ethernet / IP� Video services� TDM

� Compatible with current WDM systems� Supports Dynamic Bandwidth Allocation

(DBA)

• WDM+TDMA metro-access architecture utilizing relatively mature devices and PON control schemes

• Suitable for PON-like business services� Supports >1000 users (e.g. 32 λ x 32

split ratio) with up to 100km reach without O/E/O

� Improves upstream bandwidth vs. traditional PON architectures

Page 8

Next-Generation Data Center Intra -networking

• Typical data center network architecture utilizes a tree structure

• There is a significant amount of

• By applying OBTN, transmission and (distributed) switching are realized at TORs, and EORs

TOR(Top of Rack)

EOR(End of Row)

TOR

EOR


• There is a significant amount of traffic between TORs (~ 80% of traffic, large packet flows)

• Traffic between TORs is switched via EORs � Requires many line cards & switch cards

realized at TORs, and EORs can be saved

Page 9

TC

TC

TC

LC

SC

LC

TC

TC

TC

LC

SC

LC

TC

TC

TC

LC

SC

LC

TC

TC

TC

LC

SC

LC

LC

LC

LC

LC

LC

SC

SC

SC

SC

SC

SC

SC

SC

SC

SC

LC

LC

LC

LC

LC

XC

XC

XC

XC

LC: line cardTC: tributary (server access) cardSC: switch cardXC: OBTN all-optical switch card

Low Latency Metro Services

• Amazon: Every 100ms of latency costs 1% in sales • Google and Bing: Slow page loads can significantly affect usage, especially

delays >400-500ms (Velocity 2009 O’Reilly conference)

• Financial (High Frequency Trading): “If a broker’s electronic trading platform is 5 ms behind the competition it could lose them at least 1% of their flow” and “10ms of latency could result in a 10% drop in revenues” (TABB Group 2008)

Electrical


• OBTN is an all-optical technology which drastically reduces delay associated with Electrical switching and processing� Reduces layer transitions and associated delay� Scalable to higher bit-rates

Page 10

Electrical latency

Optical latency

Content Delivery / Video Distribution

Regional distribution

Metro / accessdistribution

Movie production

house

Sporting event

Editing, post-production

Nationaldistribution


• Content delivery and Video distribution� Transport vs. Cache – OBTN can reduce video transport and distribution cost� Video distribution and delivery of master digital file from movie house or

sporting events to editing / post-production and content providers� Accommodates short term peak demand on CDN networks such as re-

watching a previous sporting event game when a team makes it to the Super Bowl or World Cup finals

Page 11

Movie theater

Key Technology Benefits

WDM networks OBTN

~N2 transpondersFixed bandwidth

~N transpondersStatistical mux. OBTNCurrent networks

• Reduce transponders; offers dynamic bandwidth utilization� O/E/O not required at intermediate nodes� Better bandwidth utilization through DBA

• Shift L1/L2 XC functions to L0� Optical-layer enables switching bypass

and provides aggregation functions� Layer convergence provides power

consumption savings


10G

40G

100G

OBTN XC

OA Band

filter

Band

filterTFF

OBTN Line Board

WDM Line Board

P-to-P WDM

F-OADM

ROADM

OBS OPS

OBTN

• Upgradeable and co-exists with today’s WDM networks� Optical-layer switch independent of

modulation format and line rate� OBTN ring compatible with WDM/OTN

• Viable for near-term development� OBTN does not require optical buffers or

memory � A pragmatic evolution towards all-optical

router / all-optical networking

Summary

• Optical Burst Switching technologies are becoming more viable� Novel approaches to implementation can alleviate the dependencies on

advanced optical components, such as the Holy Grail of optical networking –the optical buffer

• These technologies have the potential to greatly reduce transport costs via layer convergence and elimination of costly O/E/O and electrical processing at various layers

• There appear to be a variety of applications for this technology


• There appear to be a variety of applications for this technology� Metro aggregation, Intra-data center connectivity, PON-like high bandwidth

business services, Video and content distribution

• Huawei believes OBTN is viable in the near-term and as scalability requirements are satisfied, it can scale to higher speed line-rates and to distances beyond the metro area network

Page 13Page 13

Thank YouHuawei Technologies

Documents

47pt Technology Advancements and Network Applications for ... Focus 2011... · Technology Advancements and Network Applications for Optical Burst Transport Networks HUAWEI TECHNOLOGIES