josef vojtěch, miroslav karásek, jan radil field and lab experiences with deployment of optical...

Josef Vojtěch, Miroslav Karásek, Jan Radil

www.ces.net

Field and lab experiences with deployment of optical amplifiers and FBGs

May 30, 2006 CEF Workshop

Praha, Czech Republic 2

Field and lab experiences with optical amplifiers and

FBGs Outline Motivations

Laboratory experiments Field Deployment (+ planned) Conclusions

WarningPresented ideas are of authors and do not necessarily

reflect an official opinion of the CESNET or any other institution or project, and are opened to improvement.



Utilization of dark fibres – CEF networks (the first DF line lighted by CESNET in 1999, 2.5 Gb/s PoS)National Research and Educational Networks (NRENs) rely on leased dark fibres and prefer to have no active components between the transmitter and the receiverRepeater-less or better Nothing-in-line (NIL) approachCost effective deployment of multi-gigabit lines (N x 10 GE)Single fibre bidirectional N x 10 GE transmission


FBGs Motivations



1GE NIL 300 km G.652 (EDFA only) 325 km G.652 (EDFA + Raman)

10GE NIL 2x10G+2x1G WDM 202km G.652 (EDFA + DCF) 2x10G WDM 250km G.652 (EDFA + Raman + DCF)

10G DWDM 302 km G.655+652 (EDFA + Raman)


FBGs Laboratory Experiments I



Field and lab experiences with optical amplifiers

and FBGs 2 x 10G + 2 x 1G NIL WDM 200km G.652




FBGs 2 x 10G WDM NIL 250km G.652




FBGs 10G DWDM NIL 302km G.655+G.652

EDFA 2EDFA 1

227 km G.655 + 75 km G.652

Tx

Rx

Raman pump

10GE1550,12 nm

Rx

Tx

OF1 OF2

Simulation of real lineNo CD compensation at all due to NZDSF



10GE NIL 8x10G DWDM 250km G.652 (EDFA + FBGs)

10GE NIL bidirectional (single fibre) transmission 2x4x10G 210km G.652 (EDFA + FBGs)


FBGs Laboratory Experiments II



Field and lab experiences with optical amplifiers and FBGs

8 x 10G DWDM 250km G.652Tx1

MUX

Tx8

.

.

EDFA 1 EDFA 2

FBG

Rx1

Rx8

.

.

250 km G.652

DEMUX

Optical spectrum of multiplexed channels before

amplification

Input spectrum and „eye“ diagram at Rx 7 input

1540 1545 1550 1555 1560-80

-70

-60

-50

-40

-30

-20

-10

0

Po

we

r (d

Bm

)

W ave leng th (nm )

1540 1545 1550 1555 1560-70

-60

-50

-40

-30

-20

-10P

ow

er

(dB

m)

W avelength (nm )

1551.72nm R x




2 x 4 x 10G DWDM 210km G.652Tx1

MUX 1

Tx4

EDFA 1 EDFA 2Tx5

Tx8

210 km G.652

MUX 2

FBG 1 FBG 2

Rx1Rx8Rx5 Rx4

EDFA 3 EDFA 4

DEMUX 2DEMUX 1

λ1+λ2+λ3+λ4

λ5+λ6+λ7+λ8

λ5+λ6+λ7+λ8

λ5+λ6+λ7+λ8

λ1+λ2+λ3+λ4

λ1+λ2+λ3+λ4




2 x 4 x 10G DWDM 210km G.652

1542 1544 1546 1548 1550 1552 1554-70

-60

-50

-40

-30

-20

-10

0

pow

er, d

Bm

wavelength, nm

1544 1546 1548 1550 1552 1554 1556-70

-60

-50

-40

-30

-20

-10

0

pow

er, d

Bm

wavelength, nm

Optical power at the output of MUX 1 Optical power at the output of MUX 2




2 x 4 x 10G DWDM 210km G.652

1544 1546 1548 1550 1552 1554 1556

-40

-30

-20

-10

0

pow

er, d

Bm

wavelength, nm

Optical power at the output of EDFA 3 Optical power at the output of MUX 2

1549.0 1549.5 1550.0 1550.5 1551.0 1551.5-70

-60

-50

-40

-30

-20

pow

er, d

Bm

wavelength, nm




2 x 4 x 10G DWDM 210km G.652Eye diagram of the transmitter -

DWDM XENPAKEye diagram recorded at the input of Rx1



1GE NIL 189 km G.652 Praha – Pardubice CESNET2 since May

2002 235 km G.652 Brno – Ostrava CESNET2 since June

2003

10GE 1(8 ready) x 10G DWDM 298km G.655+652

Praha - Brno CzechLight (no CD comp.) since May 2005 1(4 ready) x 10G DWDM NIL 190 km G.652 CBF Brno-CESNET2 Bratislava-SANET (FBGs) since Feb 2006


FBGs Field deployment




FBGs 4 x 10 GE DWDM CBF Brno - Bratislava

1550.12Tx1

DWDM Mux

190 km

43 dB

Booster-1 Preamp-2

FBG

-1700 ps/nm 1550.12

DWDMDemux

Rx1

1550.12

DWDMDemux

FBG

-1700 ps/nm190 km

43 dB

Preamp-1 Booster-21550.12

DWDM Mux

Rx1 Tx1

Brno Bratislava

Fiber 1

Fiber 2

190 km 43 dB

G.652

CLA PB01

Booster/Preamp

DCU CLA PB01

Booster/Preamp

DCU

1550.12

Xenpak-DWDM

1550.92

1552.52

DWDMMux/Demux

1550.12

Xenpak-DWDM

1550.921551.72

1552.52

DWDMMux/Demux

1551.72

Detail

FBG

-1000 ps/nm

FBG

-1000 ps/nm




FBGs planned up to 8 x 10 GE DWDM Brno –

ViennaCBF between Brno-CESNET2 and Vienna-ACONET (last side of triangle)Approximate length over 220 km of G.652 fiber(attenuation about 65 dB)

Real challenge – NIL (Raman amplification necessary)

CESNETBrno

SANETBratislava

ACONETVienna

190 km

108 km

220 km

Czech Rep. Slovakia

Austria




FBGs Conclusions I

Thanks to persistent technology progress - lighting of dark fibers is getting easier and easierIf static DWDM multiplex at 10 G is enough – you need only: fibres, transceivers, (amplifiers) and passives

Note: Exact setup and component needs depend on parameters as transceivers, fibre types, attenuation, etc.




Conclusions I cont.




FBGs Conclusions II

Not only higher transmission speeds but reconfigurability and all-optical signal processing also becoming more importantPresent generation of systems (ROADMs, WSSs, OXCs)For next generation - deployment and development and of new components (wavelength and NRZ/RZ conversions, pure optical OOO regenerators)Especially important (in our opinion) for academic and research community



[1] Karásek, M. - Peterka, P. - Radil, J. , „202 km repeaterless transmission of 2 x 10 GE plus 2 x 1 GE channels over standard single mode fibre. “, In: Optics Communications 235, pp. 269-274., 2004.[2] Karásek, M. - Peterka, P. - Radil, J. , „Repeaterless Transmission of 2 x 10 GE Channels over 252 km of Standard Single Mode Fibre without in-line EDFA “, In: IEEE J. on Selected Areas in Communications, sfp, 2004.[3] Radil, J. - Karásek, M., „Experiments with 10 GE long-haul transmissions in academic and research networks.“, In: I2 member meeting, Arlington, VA, 2004.[4] Altmanová L., Radil J., Šíma S., Vojtěch J., „CzechLight testbed“. In: GN2 APM meeting, Praha, Czech Republic, February 2005.


FBGs References




FBGs Acknowledgement

Lada Altmanová, Jan Gruntorád, Martin Míchal, Václav Novák, Stanislav Šíma




FBGs Thank you for your attention!

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