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Josef Vojtěch, Miroslav Karásek, Jan Radil

ALL-OPTICAL CHROMATIC DISPERSION COMPENSATION IN LONG-HAUL TRANSMISSION OVER 225km – WITH NO INLINE AMPLIFICATION. Josef Vojtěch, Miroslav Karásek, Jan Radil. www.ces.net. All-optical chromatic dispersion compensation Outline. Motivations CD compensation techniques Laboratory setup

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Josef Vojtěch, Miroslav Karásek, Jan Radil

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  1. ALL-OPTICAL CHROMATIC DISPERSION COMPENSATION IN LONG-HAUL TRANSMISSION OVER 225km – WITH NO INLINE AMPLIFICATION Josef Vojtěch, Miroslav Karásek, Jan Radil www.ces.net

  2. All-optical chromatic dispersion compensationOutline • Motivations • CD compensation techniques • Laboratory setup • Experimental results • Conclusions • Q & A CSN 2007 Palma de Mallorca, Spain

  3. All-optical chromatic dispersion compensationMotivations I • Majority of installed fibres – ITU-T G.652, SSMF • Designed for operation in O band • C band – attractive area of operation (low IL, EDFAs, …) • CD coefficient around 1550 nm ≈ 16.8 ps/(nm * km) • CD limits reach significantly • 10G NRZ - 90 km of SSMF • 40G NRZ - 5 km of SSMF • 100G NRZ - 900 m of SSMF !!! • Must be mitigated or compensated CSN 2007 Palma de Mallorca, Spain

  4. DCF DCF DCF 80 km SSMF 80 km SSMF All-optical chromatic dispersion compensationMotivations II • CD management studied intensively in regular setups • In Research and Educational Networks sometimes not possible or economically reasonable have active components between the transmitter and the receiver • Nothing-in-line (NIL) approach • CD compensation in long-haul NIL setups – relatively unknown CSN 2007 Palma de Mallorca, Spain

  5. All-optical chromatic dispersion compensationMotivations II – NIL results • 1G NIL • 300 km G.652 (EDFA only) • 325 km G.652 (EDFA + Raman) • 10G NIL • 2x10G+2x1G WDM 202km G.652 (EDFA + DCF) • 8x10G DWDM 250km G.652 (EDFA + FBGs) • 10G DWDM 302 km G.655+652 (EDFA + Raman) • 10G NIL bidirectional (single fibre) transmission • 2x4x10G 210km G.652 (EDFA + FBGs) CSN 2007 Palma de Mallorca, Spain

  6. All-optical chromatic dispersion compensationCD compensation • Electrical pre or/and post processing • All-optical compensating elements: • Dispersion compensating fibre (DCF) • Fibre Bragg grating (FBG) • Gires-Tournois etalon (GTE) • Virtually-imaged phase-array (VIPA) CSN 2007 Palma de Mallorca, Spain

  7. All-optical chromatic dispersion compensationAll-optical compensating elements comparison * Elements compensating CD of 100 km SSMF are compared ** Table based on product information known to authors CSN 2007 Palma de Mallorca, Spain

  8. Tx1 Rx1 DEMUX MU X . . . . . . Tx8 Rx8 All-optical chromatic dispersion compensationLab setup I – DCF based 225 km of SSMF DCF DCF Booster EDFA Preamp EDFAs • TX - 8 x 10 GE DWDM XFPs 1550.12 - 1556.55 nm • 225 km of SSMF on reels(granularity 50 km and 25 km)CD +3780 ps/nm • Four DCF modules -1370, -946, -689 and -343 ps/nm • Packet error rate measured by Packet Blazer 10GigE FTB-5810G CSN 2007 Palma de Mallorca, Spain

  9. Tx1 Rx1 DEMUX MUX . . . . . . CD Tx8 Rx8 All-optical chromatic dispersion compensationLab setup II – alternative elements 225 km of SSMF Booster EDFA Preamp EDFA • Compensated value -3400 ps/nm,  90% of line CD • Channelized fixed FBGs • Chanelized tuneable FBGs • Broadband fixed FBGs • Channelized tuneable GTEs CSN 2007 Palma de Mallorca, Spain

  10. All-optical chromatic dispersion compensationLab setup cont. Back-to -back eye-diagram of transmitter CSN 2007 Palma de Mallorca, Spain

  11. All-optical chromatic dispersion compensationExperimental results - DCFs Tolerance to composite launched power – post compensation CSN 2007 Palma de Mallorca, Spain

  12. All-optical chromatic dispersion compensationExperimental results - DCFs Tolerance to composite launched power – pre compensation 9% CSN 2007 Palma de Mallorca, Spain

  13. All-optical chromatic dispersion compensationExperimental results - DCFs Tolerance to composite launched power – pre compensation 18 and 25 % CSN 2007 Palma de Mallorca, Spain

  14. All-optical chromatic dispersion compensationExperimental results – alternative elements Tolerance to composite launched power – post compensation CSN 2007 Palma de Mallorca, Spain

  15. All-optical chromatic dispersion compensationExperimental results – broadband FBGs Tolerance to composite launched power – post compensation CSN 2007 Palma de Mallorca, Spain

  16. All-optical chromatic dispersion compensationExperimental results – channelized FBGs Tolerance to composite launched power – post compensation CSN 2007 Palma de Mallorca, Spain

  17. All-optical chromatic dispersion compensationExperimental results – channelized GTEs Tolerance to composite launched power – post compensation CSN 2007 Palma de Mallorca, Spain

  18. All-optical chromatic dispersion compensationExperimental results – tunable elements Tolerance to compensation ratio – post compensation CSN 2007 Palma de Mallorca, Spain

  19. All-optical chromatic dispersion compensationExperimental results – tunable elements 79% 90% 85% Influence of post compensation ratio - TCGTEs CSN 2007 Palma de Mallorca, Spain

  20. All-optical chromatic dispersion compensationExperimental results – tunable elements Tolerance to compensation ratio– pre compensation 9% CSN 2007 Palma de Mallorca, Spain

  21. All-optical chromatic dispersion compensationExperimental results – tunable elements TCGTEs - 71% post compensation TCFBGs - 71% post compensation Tolerance to compensation ratio– pre compensation 9% CSN 2007 Palma de Mallorca, Spain

  22. All-optical chromatic dispersion compensationExperimental results – tunable elements Tolerance to compensation ratio – pre compensation 18% CSN 2007 Palma de Mallorca, Spain

  23. All-optical chromatic dispersion compensationConclusions - DCFs • Post compensation - error free transmission in quite small range (about 60 – 70%) • Small pre compensation 9% - error free transmission range grows to (about 54 - 79%) • Furtherincrease of pre compensation– lower power threshold of error free operation but decreases power range significantly CSN 2007 Palma de Mallorca, Spain

  24. All-optical chromatic dispersion compensationConclusions – alternative elements • GTEs allow lower launched input powers • Broadband FBGs easily handle high launched powers • Both fixed and tuneable channelized FBGs perform nearly identically; tuneable ones a little worse due to higher IL • Small pre compensation 9% - error free transmission range grows significantly again CSN 2007 Palma de Mallorca, Spain

  25. All-optical chromatic dispersion compensationConclusions • DCFs - well known, widely deployed and broadband but bulky, lossy, prone to non-linear effects and expensive • FBGs - commercially available, lower IL, broadband (some), tunable (some), cost effective • GTEs - very low IL, tunable, cost effective but not so widespread and available • VIPAs - not tested yet, commercial availability limited • Next challenge CD compensation at 40G CSN 2007 Palma de Mallorca, Spain

  26. All-optical chromatic dispersion compensationAcknowledgement • Lada Altmanová • Jan Gruntorád • Stanislav Šíma This research has been supported by the Ministry ofEducation, Youth and Sport of the Czech Republic under research plan no. MSM6383917201 called “Optical National Research Network and Its New Applications”. CSN 2007 Palma de Mallorca, Spain

  27. All-optical chromatic dispersion compensationThank you for your kind attention!Q&A CSN 2007 Palma de Mallorca, Spain

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