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Summary of recent activities in WP6

Summary of recent activities in WP6. E. Ciaramella, M. Presi, G. Contestabile, L. Giorgi. Summary of activities. Link stabilization via optical schemes in optical networks (D9, D24, medium-term scenario): numerical analysis of WDM-comb replacement with fewer channels => nonlinear impairments

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Summary of recent activities in WP6

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  1. Summary of recent activities in WP6 E. Ciaramella, M. Presi, G. Contestabile, L. Giorgi Stockholm meeting - 2-3 Sept. 004

  2. Summary of activities • Link stabilization via optical schemes in optical networks (D9, D24, medium-term scenario): • numerical analysis of WDM-comb replacement with fewer channels => nonlinear impairments • proposed alternative • propagation of transient effects in transparent networks • Regeneration of optical signals (D24, long term) • demonstrated optical clock recovery at 40 Gb/s NRZ • Planned activities Stockholm meeting - 2-3 Sept. 004

  3. Q versus Pd/Pch • Results taken for G.652 (D=16 ps/nm/km) and G.655 (D=3 ps/nm/km) • Usual link control techniques cannot be used when many lambda are missing Stockholm meeting - 2-3 Sept. 004

  4. Transient effects in optical networks • Source: dynamical add-drop, up/down-grade, fiber cut • "other" channels in the same link experience • power variations • OSNR variations • Solutions: • gain-controlled EDFA (electrical, link, or optical feedback) • tolerant RXs • Issues: • electrical, feedback => lower gain, (low frequency oscillations) • link control: spectral hole burning, NL impairments, cost (additional sources), speed • Impairments CAN propagate to disjoint paths Stockholm meeting - 2-3 Sept. 004

  5. Transit Node 1 Transit Node 2 Source 1 Destination 1 Destination 2 Source 2 Source 3 Transit Node 1 Transit Node 2 Source 1 Destination 1 Destination 2 Source 2 Source 3 Transient propagation in a transparent network Stockholm meeting - 2-3 Sept. 004

  6. Rx Rx Rx Tx Tx Tx Pattern Generator Tx Tx Tx Rx Rx Rx Client Side Och Side VOA15 l1 OA AOM 2 OXC 1 Comparatore 1 M3 8 AOM OA BER Tester AWG Filtering OSA 2 6 Generatore di segnali 8 E4 OXC 2 2 3 OSA 1 5  VOA12 3x80km G652 4 E7 OA 7 G652 80km IL 18.2 dB Test bed Stockholm meeting - 2-3 Sept. 004

  7. Dummy WDM comb Power monitor Switch 5% OXC providing back-up WDM signals • No need for complex O/E, fewer components • Using currently available signals in the OXC • Requires simple, commercial components • Replace all missing channels in one shot Fibre Fibre break break Stockholm meeting - 2-3 Sept. 004

  8. Main Results • NOTE: we should soon test this scheme in the setup in slide 5 BER 10-1÷ 10-3 (mod 1kHz) Error FREE (mod 1kHz) Stockholm meeting - 2-3 Sept. 004

  9. All-optical clock recovery over NRZ signals • Two step conversion: conversion to PRZ and combination of SOAs and FP-filter • Demonstrated at 40 Gb/s Stockholm meeting - 2-3 Sept. 004

  10. Signal processing sequence • We report: a) input 40 Gb/s eye, b)PRZ, c) output from FPF, d) output clock Stockholm meeting - 2-3 Sept. 004

  11. Planned activities • Demonstration of transient suppression via backup channels, assessing tolerances • System analysis of innovative components (wavelength converter, regenerators etc.) compatible with node architecture • Development of 3R regenerators, wavelength converters • Partecipation to joint activities with Partner 9 (and others?), possibly to demonstration activities Stockholm meeting - 2-3 Sept. 004

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