1. Josef Vojtěch, Miroslav Karásek, Jan Radil www.ces.net Field and lab experiences with deployment of optical amplifiers and FBGs

2. 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 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. May 30, 2006 CEF Workshop Praha, Czech Republic 3 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 Field and lab experiences with optical amplifiers and FBGs Motivations

4. May 30, 2006 CEF Workshop Praha, Czech Republic 4 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) Field and lab experiences with optical amplifiers and FBGs Laboratory Experiments I

5. May 30, 2006 CEF Workshop Praha, Czech Republic 5 Field and lab experiences with optical amplifiers and FBGs 2 x 10G + 2 x 1G NIL WDM 200km G.652

6. May 30, 2006 CEF Workshop Praha, Czech Republic 6 Field and lab experiences with optical amplifiers and FBGs 2 x 10G WDM NIL 250km G.652

7. May 30, 2006 CEF Workshop Praha, Czech Republic 7 Field and lab experiences with optical amplifiers and FBGs 10G DWDM NIL 302km G.655+G.652 EDFA 2 EDFA 1 227 km G.655 + 75 km G.652 Tx Rx Raman pump 10GE 1550,12 nm Rx Tx OF1OF2 Simulation of real line No CD compensation at all due to NZDSF

8. May 30, 2006 CEF Workshop Praha, Czech Republic 8 10GE NIL 8x10G DWDM 250km G.652 (EDFA + FBGs) 10GE NIL bidirectional (single fibre) transmission 2x4x10G 210km G.652 (EDFA + FBGs) Field and lab experiences with optical amplifiers and FBGs Laboratory Experiments II

9. May 30, 2006 CEF Workshop Praha, Czech Republic 9 Field and lab experiences with optical amplifiers and FBGs 8 x 10G DWDM 250km G.652 Tx1 MUX Tx8.... EDFA 1EDFA 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

10. May 30, 2006 CEF Workshop Praha, Czech Republic 10 Field and lab experiences with optical amplifiers and FBGs 2 x 4 x 10G DWDM 210km G.652 Tx1 MUX 1 Tx4 EDFA 1EDFA 2 Tx5 Tx8 210 km G.652 MUX 2 FBG 1FBG 2 Rx1Rx8Rx5Rx4 EDFA 3EDFA 4 DEMUX 2DEMUX 1 λ 1 +λ 2 +λ 3 +λ 4 λ 5 +λ 6 +λ 7 +λ 8 λ 5 +λ 6 +λ 7 +λ 8 λ 5 +λ 6 +λ 7 +λ 8 λ 1 +λ 2 +λ 3 +λ 4 λ 1 +λ 2 +λ 3 +λ 4

11. May 30, 2006 CEF Workshop Praha, Czech Republic 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 1Optical power at the output of MUX 2

12. May 30, 2006 CEF Workshop Praha, Czech Republic 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 3Optical power at the output of MUX 2

13. May 30, 2006 CEF Workshop Praha, Czech Republic 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. May 30, 2006 CEF Workshop Praha, Czech Republic 14 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 Field and lab experiences with optical amplifiers and FBGs Field deployment

15. May 30, 2006 CEF Workshop Praha, Czech Republic 15 Field and lab experiences with optical amplifiers and FBGs 4 x 10 GE DWDM CBF Brno - Bratislava

16. May 30, 2006 CEF Workshop Praha, Czech Republic 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) CESNET Brno SANET Bratislava ACONET Vienna 190 km 108 km 220 km Czech Rep. Slovakia Austria

17. May 30, 2006 CEF Workshop Praha, Czech Republic 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. May 30, 2006 CEF Workshop Praha, Czech Republic 18 Field and lab experiences with optical amplifiers and FBGs Conclusions I cont.

19. May 30, 2006 CEF Workshop Praha, Czech Republic 19 Field and lab experiences with optical amplifiers and FBGs Conclusions I cont.

20. May 30, 2006 CEF Workshop Praha, Czech Republic 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. May 30, 2006 CEF Workshop Praha, Czech Republic 21 [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. Field and lab experiences with optical amplifiers and FBGs References

22. May 30, 2006 CEF Workshop Praha, Czech Republic 22 Field and lab experiences with optical amplifiers and FBGs Acknowledgement Lada Altmanová, Jan Gruntorád, Martin Míchal, Václav Novák, Stanislav Šíma

23. May 30, 2006 CEF Workshop Praha, Czech Republic 23 Field and lab experiences with optical amplifiers and FBGs Thank you for your attention! Q&A