Bennion, Ian

Gray, Ashley

Huang, Zhijian

Khrushchev, Igor

Lee, Yak W.A.

English

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Photonics Research GroupECOC 2003, Rimini 140Gbit/s TRANSMISSION OVER 4000KM OF STANDARD FIBRE USING IN-LINE NONLINEAR OPTICAL LOOP MIRRORSZhijian HuangAshley GrayYak Wan Andy LeeIgor KhrushchevIan BennionPhotonics Research Group,Electronic Engineering, Aston University,Birmingham, B4 7ET, UKPhotonics Research GroupECOC 2003, Rimini 2Outlinel Introductionl Experimental Setupu Recirculating loop experiment, comparison of ‘generic’ and ‘NOLM-guided’ systemsu Switching in the NOLM l Resultsu Comparison of signal dynamics in the systems with/without 2R regeneration. Observation of autosoliton propagation regime. u Bit-error-rate at speeds of 10Gbit/s and 40Gbit/s u Evolution of temporal jitter. Jitter reduction in guided system.l ConclusionPhotonics Research GroupECOC 2003, Rimini 3Introductionl Switching in nonlinear optical loop mirror (NOLM) -similar to saturable absorption. l NOLM switch can be used for 2R regeneration[1]l Existence of autosolitons predicted in dispersion managed systems guided by nonlinear loop mirrors [2] l NOLMs used in experiments for pulse shaping in transmitter [3], signal filtering at receiver [4], but not for in-line 2R[1] N. J. Smith and N. J. Doran, J. Opt. Soc. Am. B, 12, 1117-1125 (1995).[2] S. Boscolo, J.H.B. Nijhof, and S.K. Turitsyn, Opt. Lett., Vol. 25, p.1240, (2000).[3] Yikai Su, et al, Electron. Lett., vol. 38(2002), pp.573-574.[4] I. Y. Khrushchev, et al, Electron. Lett. , vol. 35(1999), pp. 1183-1185.Photonics Research GroupECOC 2003, Rimini 4Dispersion map strengthS ~ 280Average dispersion in fibre span  +0.003ps/(nm.km)SMF = standard telecom-s fibre(Corning SMF-28)DCF = dispersion compensating fibreRecirculating loop experimentSMF82kmAOMEAMDEMUXSMF83kmDCFDCF10Gb/sTxMUX10G-40G10Gb/sRxEDFARaman pumpRaman pumpRaman pumpRaman pumpAOMBPFPCAttEDFABPF70:30DSF2R Regenerator2R Regen.Photonics Research GroupECOC 2003, Rimini 50.0 0.2 0.4 0.6 0.8 1.00.000.050.100.150.200.25Pout , W (40Gb/s)pin, W (40Gbit/s)Pout, W (10Gb/s)pin, W (10Gbit/s)0.0 0.8 1.6 2.4 3.2 4.00.00.20.40.60.81.0   Switching in the NOLMl Measured back to backl Asymmetry introduced by 70:30 couplerl Pulses in the NOLM similar to solitons l Operation point close to the first transmission peak ®suppression of amplitude fluctuationsOperating RangePhotonics Research GroupECOC 2003, Rimini 61548 1551 1554 1557 1560-60-40-200  0 km 165 km 825 km 1650 kmrelative power, dBwavelength, nm1548 1551 1554 1557 1560-40-200  0 km 825 km 4215 km 7425 km 10725 kmrelative power, dBwavelength, nmSpectral evolution at 40Gbit/s.Generic system (no 2R) NOLM - guided system Photonics Research GroupECOC 2003, Rimini 7Temporal and spectral evolution at 40Gbit/s.Pulse duration Spectral bandwidth 0 2 4 6 8 10 120.20.40.60.81.01.2 NOLM guided system Generic systemDl, nmdistance, 1000*km0 2 4 6 8 10 12024681012  NOLM guided system Generic systempulse duration, psdistance, 1000*kmPhotonics Research GroupECOC 2003, Rimini 810Gbit/s transmission. Eye diagrams. l Significant suppression of ‘zeros’ noisel Significant reduction of amplitude fluctuations, ‘ones’ noisel Temporal jitter is reduced due to suppression of pulse-to-pulse interactions(a)(b)Generic system4,000 kmNOLM-guided system11,000 kmPhotonics Research GroupECOC 2003, Rimini 910Gbit/s transmission. BER. l Generic system. Error free transmission distance,  4,000 km.l NOLM-guided system. Error-free transmission, 11,000 km. Measured transmission distance is physically-limited,  i.e. no forward-error correction (FEC) was used.0 5000 10000 150001E-101E-91E-81E-71E-61E-51E-4  without inline NOLM with inline NOLMBERdistance, kmPhotonics Research GroupECOC 2003, Rimini 10NOLM guided, 40Gbit/s transmission. Eye diagrams.  i)  2500km, no signal degradationii)  4000km,some degradationiii) 6000km,  Q value ~8estimated from eyeiv) 7500km, Q value ~6estimated from eyeiv)i)ii)iii)40Gbit/sDemux 10Gbit/sPhotonics Research GroupECOC 2003, Rimini 110 1000 2000 3000 4000 50001E-101E-91E-81E-71E-61E-51E-4  without NOLM with NOLMBERdistance, kmNOLM guided, 40Gbit/s transmission.   BER.  l Generic system. Error free transmission distance,  1,000 km.l NOLM-guided system. Error-free transmission, 4,000 km*.* latest result:  6,000 km in NOLM-guided link ! Total fibre length=7200 km including DCFPhotonics Research GroupECOC 2003, Rimini 120 2000 4000 6000 800068101214  without NOLM with NOLMQ factordistance, kmQ-factor estimated from oscilloscope tracesNOLM- guided, 40Gbit/s transmission.  Q-factor.  Photonics Research GroupECOC 2003, Rimini 13Temporal jitter evolution at 40Gbit/s.0 25 5000.5100.51000.51000.510 km600 km1300 km2000 kmDelay, psIntensity , a.u. 25 5025 5025 50a0 252525255050505000.5100.51000.51000.510 km2500 km5000 km10000 kmDelay, psIntensity , a.u. bJitter estimated from autocorrelation measurements.generic systemNOLM-guided system0 2 4 6 8 10 120.00.51.01.52.02.5  NOLM guided system Generic systemjitter,psdistance, 1000*kmPhotonics Research GroupECOC 2003, Rimini 14Conclusion. l Autosoliton propagation in a dispersion managed transmission system controlled by in-line NOLMs has been experimentally demonstrated for the first time.  l Physically-limited, error-free propagation distance of 11,000km at the speed of 10Gbit/s has been achieved in the NOLM-guided system compared to 4,300km in the generic system. l Transmission distance increase from 1000km to 6,000km has been achieved at the speed of 40Gbit/s in standard fibre. l Increase rate of temporal jitter is reduced by a factor of 5 in the NOLM-guided system due to suppression of pulse-to-pulse interactions.

40GB/S Transmission over 4000KM of standard fibre using in-line nonlinear optical loop mirrors

https://publications.aston.ac.uk/id/eprint/6372/1/ECOC_03_40G.pdf

40GB/S Transmission over 4000KM of standard fibre using in-line nonlinear optical loop mirrors

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