WP5 WP5

ORC/UKA joint experiment on

OTDM to WDM Conversion

Triumph Meeting7 December 2007, Lisbon, Portugal

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 2

OutlineOutline

ORC/UKA joint experiment summary (5th November-14th November):

Experimental validation of the OTDM to WDM conversion using a NOLM switch at 128.1Gbit/s

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 3

Simulated Set-upSimulated Set-up

WDM filters

~80m SMF/ ~12mDCFPulse curving

DFB1

DFB2

DFB3

1

2

3

EAM

EDFA

EDFA

Clock Recovery

PC

HNLF

3x42.7Gbit/s WDM data

Signal

3x42.7GHz WDM Signal

Optical Delay

EDFA

128.1Gbit/s OTDM Signal

EAM wavelength dependence

Clock recovery unit not ready at 128.1Gbit/s

PC

PC

PC

Change of the OTDM wavelength due to the EDFA gain (closer to the shorter

WDM wavelength of ~3nm)

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 4

Experimental Set-upExperimental Set-upFWHM~1.5

ps

FWHM~6.5-7ps

Pin~20dBm

Pin~23dBm

FWHM~5.5ps

FWHM~6-6.5ps

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 5

Experimental Set-up Experimental Set-up (modified)(modified)

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 6

Photos of the Set-upPhotos of the Set-up

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 7

Spectral TracesSpectral Traces

All Channels ON

Wavelength[nm]

1520 1530 1540 1550 1560 1570

Pow

er[d

Bm

]-80

-60

-40

-20

0Demuxed all ON WDM3After the NOLM switchDemuxed all ON WDM2Demuxed all ON WDM1

Wavelength[nm]

1520 1530 1540 1550 1560 1570

Pow

er[d

Bm

]

-80

-60

-40

-20

0

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 8

Eye diagramsEye diagrams

WDM1 other OFF

WDM1 other ON

OTDM

WDM1

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 9

Eye diagramsEye diagrams

WDM2 other OFF

WDM2 other ON

OTDM

WDM2

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 10

Eye diagramsEye diagrams

WDM3 other OFF

WDM3 other ON

OTDM

WDM3

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 11

BER measurementsBER measurements

WDM Channels[nm]

1546 1548 1550 1552 1554 1556 1558

Sen

sitiv

ity [d

Bm

]

-32

-30

-28

-26

WDM Channels vs OTDM1 Other Channels OFF WDM Channels vs OTDM2 Other Channels OFF WDM Channels vs OTDM3 Other Channels OFF WDM Channels vs OTDM1 All Channels ON WDM Channels vs OTDM2 All Channels ON WDM Channels vs OTDM3 All Channels ON

Average Optical Power[dBm]

-38 -36 -34 -32 -30 -28 -26 -24

-log(

BE

R)

3

4

5

6

7

89

101112

WDM1 Other Channels OFFPlot 1 RegrWDM2 Other Channels OFFPlot 4 RegrWDM3 Other Channels OFFPlot 5 RegrWDM3 All Channels ON Plot 5 RegrWDM1 All Channels ON Plot 8 RegrWDM2 All Channels ONPlot 8 Regr

WDM3: Penalty~0.5dB

WDM2: Penalty~1.7dB

WDM1: Penalty~3.5dB

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 12

ConclusionsConclusions

We have experimentally demonstrated the OTDM to WDM conversion scheme using a NOLM switch at a repetition rate of 128.1Gbit/s

Error free operation was achieved for all the 3 WDM channels

During the validation of the scheme we met few issues mainly related to: Generation of the 3 WDM channels Polarisation dependence of the scheme

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 13

Siemens approachSiemens approach

Rui Morais et al. “OTDM-to-WDM Conversion based on Wavelength Conversion and Time Gating in a Single Optical Gate”, to be accepted in OFC 2008.

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 14

Siemens approachSiemens approach

<2dB

Rui Morais et al. “OTDM-to-WDM Conversion based on Wavelength Conversion and Time Gating in a Single Optical Gate”, to be accepted in OFC 2008.

TRIUMPH Meeting – 7 December 2007, Lisbon, Portugal 15

Comparisons with Siemens Comparisons with Siemens solutionsolution

ORC Solution+Faster switch and short time switching window (NOLM switch)

+Wavelength allocation is flexible

-Polarisation sensitive (non polarisation maintaining NOLM)

-2 independent sources for the OTDM signal and the WDM channels (synchronisation between them)

-More components (mainly polarisation controllers)

-EAM bandwidth and EAM wavelength dependence issues

Siemens Solution+Polarisation insensitive

+1 single source for the WDM channels

+Less components (mainly polarisation controllers)

-Relatively long time switching window at the converter (EAM-switching:5-6ps window)

-SPM broadening @128.1G to generate the other WDM channels (high input power levels)

-Wavelength allocation is not flexible

-The OTDM to WDM conversion does need synchronisation (EAM needs to be synchronised with the incoming signals)

-Are EAM bandwidth and EAM wavelength dependence issues?