Miroslav Karásek, Jan Radil, Josef Vojtěch Optical amplifiers in CzechLight and CESNET2.

Miroslav Karásek, Jan Radil, Josef Vojtěch

www.ces.net

Optical amplifiers in CzechLight and CESNET2

May 17 , 2005CEF Workshop

Praha, Czech Republic 2

Optical amplifiers in CzechLight and CESNET2 Outline

Motivations

Optical fibre amplifiers (EDFA, PDFA, Ramans)

Semiconductor optical amplifiers

Deployment of „home-made“ OAs

Conclusions



Utilization of dark fibres – CEF networks (back to 1999)

Cost effective deployment of multigigabit lines (N x 1 GE, N x 10 GE)

Lack of optical equipment suitable for NRENs

National Research and Educational Networks (NRENs) rely on leased dark fibres and prefer to have no active components between the transmitter and the receiver

Repeaterless or Nothing-in-line (NIL) approach

Optical amplifiers in CzechLight and CESNET2 Motivations



Optical kit composed from commercially available elements and modulesCommon and reliable elements + reliable design => cost effectivity & reliability & possibility of developmentCustomer based OFA modules – EDFA for 1550 nm, PDFA for 1310 nm (10 GE line cards for PC ), Raman modulesHigh power boosters, preamps, in-line amps…„Home made“ amplifiers - CzechLight amplifiers (CLA)

Optical amplifiers in CzechLight and CESNET2 Optical Fibre Amplifiers



Redundant PSU from industry leading vendor (220 V AC, 48 V DC in progress)DC voltages, fan speeds, temperature are monitoredStandard micro ATX MB w/ low power & fanless CPURuns on flash disc (no vibration sensitive rotational parts)Powered from DC/DC converter (in case of PC failure amplifiers stays on)Interfaces: RS232, FastEthernet, USB, I2CExtensive management capabilities – console, LAN, GSM, Wi-Fi, BlueTooth, SSH, SNMP

Optical amplifiers in CzechLight and CESNET2 CzechLight Amplifiers Features



Optical amplifiers in CzechLight and CESNET2 CzechLight Amplifiers Architecture

Fast Ethernet RS232C USB

MicroATX MainBoard

PSU

Alarm LEDs

PSU

OA Module 1 OA Module 2(optional)

Power & thermal management PCB

DC/DC

GSM



Optical amplifiers in CzechLight and CESNET2 CzechLight Amplifiers



Cost effective solutions, especially for 1310 nm windowEDFAs are more powerful and less noisy (but more expensive)But PDFAs are not so widespread and common, optical parameters (output powers and noise figures are not comparable with EDFAs) – SOAs can present an interesting solution10 GE line cards for PC (PCI-X, PCI-E) S2io (Neterion), Chelsio, Intel with fixed 1310 nm transceivers onlyThe only way to extend reach is to deploy amplifiers (10 km is not enough, even for MANs in the Czech Republic)

Optical amplifiers in CzechLight and CESNET2 Semiconductor Optical Amplifiers



Optical amplifiers in CzechLight and CESNET2 Semiconductor Optical Amplifiers



Optical amplifiers in CzechLight and CESNET2 SOAs versus FOAs



Optical amplifiers in CzechLight and CESNET2 CLAs Deployment

Both in CESNET2 (production) and CzechLight (experimental and breakable) networksPraha – Hradec Králové (CESNET2 network) 150.4 km of G.652, 35.7 dB@1550nm NIL, OSA (one side amplification) w/ CLA, 1 GE Experimental since Dec 2004, fully in production

March 2005




Praha – Hradec Králové (CESNET2 network) Optical spectrum analyzer measurements

Before preamp After preamp and filtering




Praha – Brno (CzechLight network) 298 km, mixture of G.652/G.655+/G.655-, 67

dB@1550nm Not NIL solution, without Ramans but with one inline

CzechLight amplifier (2in1) Today 1 channel, 10 G SONET, DWDM transceivers, ready

for 8 (16 with high power boosters and inline amps) 10 G DWDM SONET/SDH/Ethernet channels!

The last week we‘ve started to experiment with DWDM MUX/DEMUXes, everything seems to be working fine

Deployment of (tuneable) FBGs and ROADMs is already planned




A bit of History :-) Started with 302 km of mixture of G.652/G.655+

fibre spools, EDFAs and Ramans, 65 dB@1550nm - working fine

297 km testing fibre loops, in the ground, mixture of G.652/G.655+/G.655-, 66 dB@1550nm - working fine

The „true“ 298 km/67 dB line Praha – Brno was (and still is) sort of bewitched, the BER was too high for our NIL configuration with Ramans :- (



Optical amplifiers in CzechLight and CESNET2 Conclusions

Development and deployment of new components (FBGs, wavelength and NRZ/RZ conversions, ROADMs, OOO equipment, TDM pumped Ramans,…)

Especially important (in our opinion) for academic and research community

New solutions for all-optical signal processing



Optical amplifiers in CzechLight and CESNET2 Acknowledgement

Lada Altmanová, Jan Gruntorád, Stanislav Šíma, Martin Míchal



[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] Radil, J. - Karásek, M., „Experiments with 10 GE long-haul transmissions in academic and research networks.“, In: I2 member meeting, Arlington, VA, 2004.

[3] Altmanová L., Radil J., Šíma S., Vojtěch J., „CzechLight testbed“. In: GN2 APM meeting, Praha, Czech Republic, February 2005.

[4] Vojtěch J., „CzechLight and CzechLight amplifiers“. In: 17th TF-NGN meeting, Zurych, Switzerland, April 2005.

Optical amplifiers in CzechLight and CESNET2 References



Optical amplifiers in CzechLight and CESNET2

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Miroslav Karásek, Jan Radil, Josef Vojtěch Optical amplifiers in CzechLight and CESNET2.

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