application of all-optical signal regeneration technology to next-generation network (ngn) mikio...

Application of All-Optical Signal Regeneration Technology to Next-Generation Network (NGN)

Mikio Yagi, Shiro Ryu (1), and Shoichiro Asano (2)

1: Laboratories, Japan Telecom Co., Ltd.2: National Institute of Informatics

Internet2 Spring 2005 Member Meeting

Application of GMPLS Technology and All-Optical Signal Regeneration Technology to Next-Generation Network (NGN)

May 4, 2005

2

Internet2 Spring 2005 Member Meeting Application of GMPLS Technology and All-Optical signal Regeneration Technology to Next-Generation Network

Proprietary of Japan Telecom Co., Ltd, and National Institute of Informatics. 4/May/2005

Agenda

• Future networks, applications, and key technologies

• Our recent activities– All-optical 2R regeneration systems experiment

– Field trial of 40-Gbit/s wavelength path with quality assurance by optical 2R regeneration system

• Conclusion

Future networks, applications, and key technologies.

4



NGN applications

• GRID computing• Genome information analysis• High energy and nuclear fusion

research

• Space and astronomical science

• IT-Based Laboratory (ITBL)

• Storage area network (SAN)

5



What is needed for the future network ?

Task

Result

• Communication style– Human to human– Human to computer– Computer to computer All-optical network

Global GRID computing

6



Next generation network: All-optical network

DWDMMesh

Network

IP routerPXCPXC

PXC

PXC

PXC

PXC

Photoniccrossconnect

Interwork

DWDM

Any client signal

Any client signal

GMPLS: Generalized Multi-Protocol Label Switching

All-optical signal processing node

7



All-optical network characteristics

Stringent security

On-demand

Topology-free

Bit-rate-freeSmall latency

Protocol-freeHigh speed / High capacity

8



Key technologies for the future network : Physical layer

• Switching technologies in repeater node– Optical crossconnect (OXC)/Photonic crossconnect (PXC)

• High-speed switching– Optical add/drop multiplexing (OADM)

• All-optical signal processing technologies– All-optical regeneration

• 2R regeneration (reamplifying and reshaping)• 3R regeneration (reamplifying, reshaping, and retiming)

– Optical wavelength conversion– Compensation of fiber parameter effect (Chromatic dispersion / Polarizat

ion-mode dispersion)

• Optical signal quality measurement technology

Our recent activities

10



Super SINET project

Super SINET is an ultrahigh-speed network intended to develop and promote Japanese academic researches by strengthening collaboration among leading academic research institutes.

http://www.sinet.ad.jp/english/super_sinet.html

•High energy and nuclear fusion

•Space and astronomical science

•Genome information analysis (bio-informatics)

• Supercomputer-interlocking distributed computing (GRID)

•Nanotechnology

11



Our challenge

• For realization of future ultra-high-speed all-optical network – Physical layer

• Chromatic dispersion compensation technologies [Internet2 Fall 2004MM]

• All-optical regeneration technologies

– All-optical 2R regeneration systems experiment

– Field trial of 40Gbit/s wavelength path quality assurance using all-optical 2R regeneration system

– Control plane

– Service application

All-optical 2R regeneration systems experiment

13



2R regeneration and 3R regeneration

RetimingReamplifyingReshaping

3R regeneration

Reamplifying Reshaping

2R regeneration

14



How can all-optical 2R regeneration be realized ?

• 2R regeneration :

– reamplifying and reshaping

Amplified amplitude

Noise of level 1

Noise of level 0

Input signal

Input vs output characteristic of an optical device that has non-linear effect

15



How can all-optical 2R regeneration be realized? (Cont.)

• 2R regeneration :

– reamplifying and reshaping

Amplified amplitude

Noise suppression Noise of

level 1

Noise of level 0

IN

OUT

Input signal

Input vs output characteristic of an optical device that has non-linear effect

Output signal

An electro-absorption

modulator (EAM) has an effect

of noise suppression.

Opticaldevice

Input Output

Optical device

16



Experiment of 320-km transmission with 2R system

WD

M

WD

M 1

22R regeneration

system

320-km w/o 2R

Q-factor: 16.9dB

320-km with 2R

Q-factor: 17.7dB

0.8dBimprovement

The all-optical 2R regeneration system can improve degraded signal.The all-optical 2R regeneration system can improve degraded signal.

Field trial:

40Gbit/s wavelength path quality assurance using all-optical 2R regeneration system

M. Yagi, et al., “Field trial of 40-Gbit/s wavelength path quality assurance using GMPLS-controlled all-optical 2R regenerator,” Proc. OFC2005, OThP3, Mar. 2005.

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Application of all-optical 2R regeneration technology to NGN

• A wavelength path changes dynamically.– Network protection/restoration– Peer-to-peer wavelength path application

• A wavelength path changes dynamically.– Network protection/restoration– Peer-to-peer wavelength path application

• Fiber parameters change along the path.– Chromatic dispersion– Polarization-mode dispersion

• Fiber parameters change along the path.– Chromatic dispersion– Polarization-mode dispersion

• A signal quality may be degraded by the change of the path. – Signal-noise-to ratio (SNR)

• A signal quality may be degraded by the change of the path. – Signal-noise-to ratio (SNR)

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Application of all-optical 2R regeneration technology to NGN (Cont.)

• The wavelength path is reconfigured dynamically.– Future all-optical network is controlled by GMPLS protocol.– Signal quality after the reconfiguration of a path can not be

predicted in advance.– The signal quality after the reconfiguration should be kept high,

e.g. over a BER of 1x10-12.

• All-optical regeneration technology is considered to be effective for the improvement of the SNR of the path. – If an all-optical regenerator is adaptively applied to a degraded path, its

application will make it possible to improve the quality of the path.

• Measurement plane is essential for all-optical network.

- Multilayer integration is effective to manage network generally.

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Objective

• In this work

– Field trial in which an all-optical 2R regenerator using an electro-

absorption modulator is adaptively applied to a degraded 40-

Gbit/s wavelength path based on the measurement of its quality.

– This operation is realized by multilayer integration systems

among a GMPLS control plane, a measurement plane, and a

data plane.

• In this work

– Field trial in which an all-optical 2R regenerator using an electro-

absorption modulator is adaptively applied to a degraded 40-

Gbit/s wavelength path based on the measurement of its quality.

– This operation is realized by multilayer integration systems

among a GMPLS control plane, a measurement plane, and a

data plane.

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Location and experimental setup of field trial

GMPLS Control plane

Data plane

Yame Station

Fukuoka Station

Tosu Station

Route 2 (66-km NZDSF)

Route 1 (35-km SMF)

First span (66-km NZDSF) Second span

Third span(31-km NZDSF)

Route 2 (31-km NZDSF)

Kyushu University

40-Gbit/s receiver

Chromatic dispersion analyzer (receiver)

-DEM

UX

Chromatic dispersion

compensator

Chromatic dispersion analyzer

(transmitter)

-MU

X

PXC

PXC

PXC

Kyushu University

GMPLScontroller

GMPLScontrollerGMPLS

controller

GMPLScontroller

Optical amplifier

SC-DCF

Optical amplifier

SC-DCF

SC-DCF

SC-DCF

SC-DCF

VOA Optical amplifier

GMPLScontroller

40-Gbit/s, 32-channel WDM transmitters

SC-DCF: Slope-compensating dispersion compensation fiber , PXC: Photonic cross-connect

-MU

X

-DEM

UX

All-optical2R system

Q-factormeasuremen

t

Measurement plane


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Multilayer integration system

GMPLS Control plane

GMPLS Control plane

Data plane Chromatic dispersion analyzer (receiver)

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


(transmitter)

Measurement plane

1. Path Setup Request

Data plane

2. RSVP - PATH ( Path setup )3. RSVP - RESV

Service plane1. Service request

1. Service request

2. Path setup


40-Gbit/s receiver

Q-factormeasuremen

t

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GMPLS Control plane

Data plane

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


GMPLS Control plane

Measurement plane


Data plane


4. Data plane setup5. CD measurement




(transmitter)



(transmitter)


40-Gbit/s receiver

Q-factormeasuremen

t

24



GMPLS Control plane

Data plane

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


GMPLS Control plane

Measurement plane


Data plane


4. Data plane setup5. CD measurement


7. Set the value to CD compensator6. Receive the measured CD value



(transmitter)



compensator

CD value


40-Gbit/s receiver

Q-factormeasuremen

t

25



GMPLS Control plane

Data plane

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


GMPLS Control plane

Measurement plane


Data plane

Service plane



(transmitter)

Optical-2Rsystem

40-Gbit/s receiver

8. Q-factor measurement9. If Q-factor is less than a threshold value, 2R system is applied.

10. To incorporate the 2R system into the current path11. Path reservation


Q-factormeasuremen

tQ-factor

measurement

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GMPLS Control plane

Data plane

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


GMPLS Control plane

Measurement plane


Data plane

Service plane



compensator

Optical-2Rsystem

40-Gbit/s receiver


10. Incorporate the 2R system into the current path11. Path reservation is finished.


Q-factormeasuremen

t


(transmitter)


(transmitter)


CD value

12. CD measurement

13. CD compensation

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GMPLS Control plane

Data plane

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


GMPLS Control plane

Measurement plane


Data plane

Service plane


Optical-2Rsystem

40-Gbit/s receiver




Q-factormeasuremen

t


(transmitter)

12. CD measurement

13. CD compensation

Q-factormeasurement

14. Q-factor measurement15. If a Q-factor is larger the threshold

value, path setup is completed.

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GMPLS Control plane

Data plane

-DEM

UX


compensator

-MU

X

PXC

PXC

PXC


GMPLS Control plane

Measurement plane


Data plane

Service plane


Optical-2Rsystem

40-Gbit/s receiver




Q-factormeasuremen

t


(transmitter)

12. CD measurement

13. CD compensation

16. Service in

14. Q-factor measurement15. If a Q-factor is larger the threshold value, path setup is completed.

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Experimental results

Performance evaluation

• A fault is generated intentionally to initiate a rerouting operation from Route 1 to 2.

• Measurement of the error count is started.

• A BER of Route 1 was set at about 1x10-12.

GMPLS Control plane

Data plane Chromatic dispersion analyzer (receiver)

-DEM

UX


compensator


(transmitter)

-MU

X

PXC

PXC

PXC

All-Optical2R system

40-Gbit/s receiver

Q-factormeasuremen

t

Route 1

Route 2

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Experimental results

Error count v.s. time in rerouting operation

0

4

8

12

16

20

0 20 40 60 80 100 120 140Time [sec]

Err

or

co

un

tRoute 1 Route 2

10.0 sec

0

4

8

12

16

20

0 20 40 60 80 100 120 140 160Time [sec]

Err

or

co

un

t Route 1 Route 2

29.6 sec

Fig.b : Multilayer integration system operation with 2R regenerator.

Fig.a : Multilayer integration system operation without 2R regenerator.

29.5 sec

10.0 sec

Multilayer integration system with 2R regenerator is effective to ensure the quality of the wavelength path.

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Experimental results Sequence diagram of multilayer integration system operation

RSVP Path / Resv (Route 1)

Time[sec]

GMPLS control plane

CD measurement

Q measurement : (17.3dB)

Service inReceive the “ready”

Fault detection, RSVP PathTear

RSVP Path / Resv (Route 2 w/o 2R)

Set the CD value

Set the CD valueQ measurement : (16.0dB)Receive the request to “add 2R”

RSVP Path / Resv (Route 2 w 2R)

Set the CD valueQ measurement : (17.2dB)


Route 1

Route 2

w/o 2R

Route 2

with 2R

RSVP PathTear

Rerouting process

(CD Compensator /2R system)

Measurement planeSignal quality [Q-factor] measurement

Data plane

CD measurement

CD measurement

CD measurement

0.0

11.4

76.2

77.1

90.8

90.9

105.7

12.8

Setup of Route 1

Rerouting operation

Service-in using Route 2 with 2R

Service-in using Route 1

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Experimental results Sequence diagram of multilayer integration system operation( Rerouting operation)

Time[sec]

GMPLS control plane




Route 2 w

/o 2RR

oute 2 with 2R

Receive the request to “add 2R”

RSVP Path / Resv

(Route 2 w 2R)

RSVP PathTear

Fault detection, RSVP PathTear

RSVP Path / Resv

(Route 2 w/o 2R)

Rerouting process

(CD Compensator /2R system)

Measurement planeSignal quality [Q-factor] measurement

Data plane

Set the CD valueCD measurement

Set the CD valueCD measurement

CD measurement

76.2

77.10.9 sec

90.9

0.02 sec

105.7 5.4sec

8.2 sec82.5

5.6 sec

90.8

9.5 sec97.5

0.01 sec105.7

Total fault time: 29.5 sec

Conclusion

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Conclusion

• A field trial of 40-Gbit/s wavelength path quality assurance by multilayer integration system operation among a GMPLS control plane, a measurement plane, and a data plane has been demonstrated successfully.

• All-optical 2R regeneration system can effectively be applied for the signal quality improvement in all-optical network.

• This method can integrate not only 2R regenerator but also 3R regenerator.

• A field trial of 40-Gbit/s wavelength path quality assurance by multilayer integration system operation among a GMPLS control plane, a measurement plane, and a data plane has been demonstrated successfully.

• All-optical 2R regeneration system can effectively be applied for the signal quality improvement in all-optical network.

• This method can integrate not only 2R regenerator but also 3R regenerator.

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Open issues

• Higher capacity switching• Higher speed transmission system technologies (160 Gbit/s …..)• Signal quality monitoring method based on all-optical processing• Multilayer integration including higher layer.• Network security (data plane, control plane)• Appropriate routing methods for IP-optical integrated network• Network management including physical layer parameters

There are a lot of issues to be resolved for realization of the all-optical network.

There are a lot of issues to be resolved for realization of the all-optical network.

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Thank you for your kind attention !

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application of all-optical signal regeneration technology to next-generation network (ngn) mikio...

Documents

2005internet2 spring

4may2005key technologies

quality assurance

4may2005agendafuture

gbits wavelength path

nuclear fusion researchspace

astronomical science

repeater nodeoptical