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Technologies and Architectures for Metro Network K. Ennser Dipartimento di Fisica - Politecnico di Milano, Italy. Outline. Introduction Dynamically reconfigurable metro network issues Amplifier gain saturation and accumulated power transients Architectures design

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Outline

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  1. Technologies and Architectures for Metro NetworkK. EnnserDipartimento di Fisica - Politecnico di Milano, Italy

  2. Outline • Introduction • Dynamically reconfigurable metro network issues • Amplifier gain saturation and accumulated power transients • Architectures design • Optical burst (OBS) and optical packet switching (OPS) technologies for advanced networks • Study of bursting signal • Subsystem stable for induced transients on bursting signals • Interest for collaborations

  3. Motivation • In a dynamically reconfigurable WDM network the channel load variation may cause significant power transients accumulation due to the optical amplifier gain saturation. Transmission errors may occur. Proposal: simple, low cost and robust optical gain control (OGC) technique • In the metropolitan scenario it is important to investigate cost effective solutions. Proposal: alternative active devices for cost reduction, small footprint and performance increase • Advanced networks: Optical burst (OBS) and optical packet switching (OPS) technologies will create sequences of bursting/packet signals causing amplifier gain instabilities. Proposal:use OGC amplifiers to reduce bursting transients

  4. WDM signal no clamping EDFA clamping Optical Gain Clamping (OGC) • Need for reliable and stable optical amplifier insensitive to transients due to dynamic channel reconfiguration or failure/restoring of optical WDM metro networks

  5. Waveguide Amplifier • Waveguide offers • small footprint • Integration of several functions • potential mass production • More simply... Chip size - 25x13mm S. Frolov, OFC 2006 Courtesy of Inplane Photonics • Gain 5.3 dB/cm • Linear EDWA is possible

  6. WDM Metro Ring Network OGC-EDWA Laser power and ASE recirculating Probe channel -14 dBm (=1 ch) Total input power (16 WDM channels) -2 dBm Repetition rate (Add/drop operation) 1kHz (50% duty cycle)

  7. Channel Dynamic Reconfiguration Maximum overshoot <0.25 dB Maximum power variation ~0.4 dB dominated by SHB offset Maximum ASE variation 1.3 dB (due to SHB)

  8. Failure / Restoration Results Abrupt failure and restoration dynamic <0.4 dB total gain offset due to SHB is induced in 3 EDWAs. Fast time recovering of the order of 100 ms • See today posters We3.P.132 (Metro network using bi-directional EDWA) • See oral presentation We2.6.5 (Bi-directional EDWA)

  9. Linear Optical Amplifier for Bi-directional Metro Experimental set-up of 16 channels WDM bi-directional transparent ring network based on LOA.

  10. Linear Optical Amplifier (SOA) Probe channel transients for different input power level at the LOAs Clockwise optical spectrum: a) Closed loop without optimization b) closed loop with optimization c) open loop. A careful network design is required to obtain useful OSNR, insensitivity to dynamic channel reconfiguration and to chaotic lasing effects.

  11. Advanced Metro Networks • Optical burst transmission is very promising to implement IP traffic over WDM and to guarantee payload transparency as well as efficient bandwidth utilisation with respect to other solutions. • Proposal: Control of amplifiers gain excursion Output power transients of an OGC-EDWA for bursting input signals

  12. Reconfiguration in OBS Transmission * See today posters We3.P. 29 (burst amplification)

  13. Interest for Collaboration • Performance evaluation of transmission technologies and in particular for advanced networks (OBS/OPS, etc) • Development of optical components to guarantee stable Optical Network operation under Network dynamic management and channel reconfiguration • Development of new cost-effective network architecture allowing flexibility, reliability and quality-of-service • Stronger interaction between the physical and management level

  14. THANK YOU!Part of the research activity was supported by COST291. I would like to acknowledge the contribution from Ericsson, CNIT, SSSUP and WUT.

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