Miroslav Karsek, Jan Radil, Josef Vojtech

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Optical amplifiers in CzechLight and CESNET2
www.ces.net

• Miroslav Karásek, Jan Radil, Josef Vojtech

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Optical amplifiers in CzechLight and CESNET2
Outline

• Motivations
• Optical fibre amplifiers (EDFA, PDFA, Ramans)
• Semiconductor optical amplifiers
• Deployment of home-made OAs
• Conclusions

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Optical amplifiers in CzechLight and CESNET2
Motivations

• 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

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Optical amplifiers in CzechLight and CESNET2
Optical Fibre Amplifiers

• Optical kit composed from commercially available
  elements and modules
• Common and reliable elements reliable design gt
  cost effectivity reliability possibility of
  development
• Customer based OFA modules EDFA for 1550 nm,
  PDFA for 1310 nm (10 GE line cards for PC ),
  Raman modules
• High power boosters, preamps, in-line amps
• Home made amplifiers - CzechLight amplifiers
  (CLA)

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Optical amplifiers in CzechLight and CESNET2
CzechLight Amplifiers Features

• Redundant PSU from industry leading vendor (220 V
  AC, 48 V DC in progress)
• DC voltages, fan speeds, temperature are
  monitored
• Standard micro ATX MB w/ low power fanless CPU
• Runs 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, I2C
• Extensive management capabilities console, LAN,
  GSM, Wi-Fi, BlueTooth, SSH, SNMP

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Optical amplifiers in CzechLight and CESNET2
CzechLight Amplifiers Architecture
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Optical amplifiers in CzechLight and CESNET2
CzechLight Amplifiers
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Optical amplifiers in CzechLight and CESNET2
Semiconductor Optical Amplifiers

• Cost effective solutions, especially for 1310 nm
  window
• EDFAs 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 solution
• 10 GE line cards for PC (PCI-X, PCI-E) S2io
  (Neterion), Chelsio, Intel with fixed 1310 nm
  transceivers only
• The only way to extend reach is to deploy
  amplifiers (10 km is not enough, even for MANs in
  the Czech Republic)

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Optical amplifiers in CzechLight and CESNET2
Semiconductor Optical Amplifiers
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Optical amplifiers in CzechLight and CESNET2
SOAs versus FOAs
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Optical amplifiers in CzechLight and CESNET2
CLAs Deployment

• Both in CESNET2 (production) and CzechLight
  (experimental and breakable) networks
• Praha Hradec Králové (CESNET2 network)
• 150.4 km of G.652, 35.7 dB_at_1550nm
• NIL, OSA (one side amplification) w/ CLA, 1 GE
• Experimental since Dec 2004, fully in production
  March 2005

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Optical amplifiers in CzechLight and CESNET2
CLAs Deployment

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

Before preamp
After preamp and filtering
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Optical amplifiers in CzechLight and CESNET2
CLAs Deployment

• Praha Brno (CzechLight network)
• 298 km, mixture of G.652/G.655/G.655-, 67
  dB_at_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 weve started to experiment with
  DWDM MUX/DEMUXes, everything seems to be working
  fine
• Deployment of (tuneable) FBGs and ROADMs is
  already planned

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Optical amplifiers in CzechLight and CESNET2
CLAs Deployment

• A bit of History -)
• Started with 302 km of mixture of G.652/G.655
  fibre spools, EDFAs and Ramans, 65 dB_at_1550nm -
  working fine
• 297 km testing fibre loops, in the ground,
  mixture of G.652/G.655/G.655-, 66 dB_at_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 - (

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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

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Optical amplifiers in CzechLight and CESNET2
Acknowledgement

• Lada Altmanová, Jan Gruntorád,
  Stanislav íma, Martin Míchal

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Optical amplifiers in CzechLight and CESNET2
References

• 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 ?bre.
  , 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., íma S., Vojtech J.,
  CzechLight testbed. In GN2 APM meeting, Praha,
  Czech Republic, February 2005.
• 4 Vojtech J., CzechLight and CzechLight
  amplifiers. In 17th TF-NGN meeting, Zurych,
  Switzerland, April 2005.

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Optical amplifiers in CzechLight and CESNET2
Thank you for your attention!