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Loop experiment of cascading 16 A/D nodes at 10 Gb/s/ch. over 600 km total distance

Loop experiment of cascading 16 A/D nodes at 10 Gb/s/ch. over 600 km total distance. Why cascading many nodes?. SONET SDH Ring : 16 TDM A/D WaveStar AllMetro : 10 nodes @ OC48 (2 large, 8 small) Demonstrated 4ch.@10Gbps / 200GHz / 15 nodes and many ch. @2.5Gbps X many nodes.

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Loop experiment of cascading 16 A/D nodes at 10 Gb/s/ch. over 600 km total distance

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  1. Loop experiment of cascading 16 A/D nodes at 10 Gb/s/ch. over 600 km total distance

  2. Why cascading many nodes? • SONET SDH Ring : 16 TDM A/D • WaveStar AllMetro : 10 nodes @ OC48 (2 large, 8 small) • Demonstrated 4ch.@10Gbps / 200GHz / 15 nodes and • many ch. @2.5Gbps X many nodes Issues in large scale optical network systems • OSNR degradation • Filter narrowing • Filter / signal mis-alignment • Accumulated crosstalk • This work demonstrate 16 nodes cascade • @ 10Gbps/ch. over 600km(TRUE_RS)

  3. DCF (-320 ps/nm) 10Gbps 16 wavelength (100GHz spacing, 1548 - 1560 nm) TRUE_RS 25 km SW SW Signal Generator 3dB WIF odd RX even Experimental setup A/D loss : 13dB, Fiber loss : 9 dB Loss difference between channel for one loop : ~ 1 dB Accumulated dispersion : ~ 60 - 90 ps/nm/loop Input power into EDFA : ~ -9 dBm/ch. Input power into fiber : ~ 0 dBm/ch.

  4. 36 3 36 32 32 OSNR (dB, 0.1nm RB) OSNR (dB, 0.1nm RB) 28 24 28 24 24 20 20 0 5 10 15 20 25 0 5 10 15 Number of span cascaded channel number OSNR vs. number of spans After 24 span, OSNR ranges 26 - 29 dB Q values : ~ 17.2 - 20.5

  5. BER performance after 16 nodes, 600 km Penalty : within 1.5 dB - 4 4 c h 6 c h 1 4 c h 1 2 ) - 5 c h 1 0 y t i c h 8 l i c h 4 b a c h 2 - 6 6 b B a c k t o B a c k o r P - 7 r o r r - 8 8 E ( g - 9 o l - 1 1 0 0 - 1 1 1 1 - 2 2 - 2 2 - 2 1 - 2 0 - 1 9 - 1 8 - 1 7 - 1 6 - 1 5 R e c e i v e d P o w e r ( d B m )

  6. ch2 ch10 ch6 ch14 Eye pattern after 600 km

  7. Filter narrowing and miss-alignment Induces • OSNR degradation • Received power decrease (without EDFA) • Eye distortion due to phase and amplitude transfer function of the accumulated filter shape and their mixing with signal chirp and fiber dispersion

  8. 0.5 ch2 ch4 0.45 ch6 0.4 ch8 ch10 0.35 ch12 3 dB bandwidth (nm) ch14 0.3 0.25 0.2 0.15 0 5 10 15 20 Number of cascaded nodes 3 dB bandwidth vs. number of cascaded nodes After 16 node cascaded : 24 - 30GHz (0.2 - 0.25 nm)

  9. 4.5 33 # of loops 2 4 6 8 3.5 29 2.5 25 Penalty (dB) OSNR (dB, 0.1nm RB) 1.5 21 0.5 17 1555.1 1555.2 1555.3 1555.4 1555.5 1555.6 Wavelength(nm) Detuning penalty vs. OSNR change After 16 nodes, ~ 25 - 26 dB OSNR @ 2 dB penalty

  10. **Noise spectra -15 -20 8 5 dB / Div. -25 -30 2 1555.1 1555.3 1555.5 1555.3 1555.1 1555.5 Received power change @RX vs. detuning About 6 dB RX power change @ ± 0.1nm detuning after 16 nodes

  11. Eye distortion vs. detuning -24GHz Optimum -18GHz +5GHz -10GHz +10GHz

  12. Summary Loop experiment of cascading 16 A/D nodes at 10 Gb/s over 600 km total distance After 600km transmission, OSNR : 26 - 29 dB ~ 2 dB bandwidth : 0.15nm

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