Josef Vojtech, Miroslav Karsek, Jan Radil

1
Field and lab experiences with deployment of
optical amplifiers and FBGs
www.ces.net

• Josef Vojtech, Miroslav Karásek, Jan Radil

2
Field and lab experiences with optical amplifiers
and FBGs Outline

• Motivations
• Laboratory experiments
• Field Deployment ( planned)
• Conclusions

• Warning
• Presented 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.

3
Field and lab experiences with optical amplifiers
and FBGs Motivations

• 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 receiver
• Repeater-less or better Nothing-in-line (NIL)
  approach
• Cost effective deployment of multi-gigabit lines
  (N x 10 GE)
• Single fibre bidirectional N x 10 GE transmission

4
Field and lab experiences with optical amplifiers
and FBGs Laboratory Experiments I

• 1GE NIL
• 300 km G.652 (EDFA only)
• 325 km G.652 (EDFA Raman)
• 10GE NIL
• 2x10G2x1G WDM 202km G.652 (EDFA DCF)
• 2x10G WDM 250km G.652 (EDFA Raman DCF)
• 10G DWDM 302 km G.655652 (EDFA Raman)

5
Field and lab experiences with optical amplifiers
and FBGs 2 x 10G 2 x 1G NIL WDM 200km G.652
6
Field and lab experiences with optical amplifiers
and FBGs 2 x 10G WDM NIL 250km G.652
7
Field and lab experiences with optical amplifiers
and FBGs 10G DWDM NIL 302km G.655G.652

• Simulation of real line
• No CD compensation at all due to NZDSF

8
Field and lab experiences with optical amplifiers
and FBGs Laboratory Experiments II

• 10GE NIL
• 8x10G DWDM 250km G.652 (EDFA FBGs)
• 10GE NIL bidirectional (single fibre)
  transmission
• 2x4x10G 210km G.652 (EDFA FBGs)

9
Field and lab experiences with optical amplifiers
and FBGs 8 x 10G DWDM 250km G.652
Optical spectrum of multiplexed channels before
amplification
Input spectrum and eye diagram at Rx 7 input
10
Field and lab experiences with optical amplifiers
and FBGs 2 x 4 x 10G DWDM 210km G.652
11
Field and lab experiences with optical amplifiers
and FBGs 2 x 4 x 10G DWDM 210km G.652
Optical power at the output of MUX 1
Optical power at the output of MUX 2
12
Field and lab experiences with optical amplifiers
and FBGs 2 x 4 x 10G DWDM 210km G.652
Optical power at the output of EDFA 3
Optical power at the output of MUX 2
13
Field and lab experiences with optical amplifiers
and FBGs 2 x 4 x 10G DWDM 210km G.652
Eye diagram of the transmitter - DWDM XENPAK
Eye diagram recorded at the input of Rx1
14
Field and lab experiences with optical amplifiers
and FBGs Field deployment

• 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.655652
• 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

15
Field and lab experiences with optical amplifiers
and FBGs 4 x 10 GE DWDM CBF Brno - Bratislava
16
Field and lab experiences with optical amplifiers
and FBGs planned up to 8 x 10 GE DWDM Brno
Vienna

• CBF 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)

Czech Rep.
Slovakia
Austria
17
Field and lab experiences with optical amplifiers
and FBGs Conclusions I

• Thanks to persistent technology progress -
  lighting of dark fibers is getting easier and
  easier
• If 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.

18
Field and lab experiences with optical amplifiers
and FBGs Conclusions I cont.
19
Field and lab experiences with optical amplifiers
and FBGs Conclusions I cont.
20
Field and lab experiences with optical amplifiers
and FBGs Conclusions II

• Not only higher transmission speeds but
  reconfigurability and all-optical signal
  processing also becoming more important
• Present 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

21
Field and lab experiences with optical amplifiers
and FBGs 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 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., íma S., Vojtech J.,
  CzechLight testbed. In GN2 APM meeting, Praha,
  Czech Republic, February 2005.

22
Field and lab experiences with optical amplifiers
and FBGs Acknowledgement

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

23
Field and lab experiences with optical amplifiers
and FBGs Thank you for your attention!QA