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COST 267 Semiconductor devices for optical signal processing Sep. 1998 – June 2002

COST 267 Semiconductor devices for optical signal processing Sep. 1998 – June 2002. Rx 1. Ch 1. Ch 2. Rx 2. Demux. Ch 3. Rx 3. Mux. Rx 4. Ch 4. Signal processing in high-capacity systems. 1 2 3 4. Pulsed laser. Regeneration. Optical gate.

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COST 267 Semiconductor devices for optical signal processing Sep. 1998 – June 2002

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  1. COST 267Semiconductor devices for optical signal processing Sep. 1998 – June 2002 TC-TIST meeting, Thessaloniki, June 2002

  2. Rx 1 Ch 1 Ch 2 Rx 2 Demux Ch 3 Rx 3 Mux Rx 4 Ch 4 Signal processing in high-capacity systems 1 2 3 4 Pulsed laser Regeneration Optical gate Electronic bottlenecks may be avoided by the use of all-optical signal processing: switch light with light control “AND” gate can be implemented in a nonlinear device signal to switch output

  3. Background • Wavelength Division Multiplexing is used to increase the network capacity. Optical Time Division Multiplexing is a promising technique for increasing the bitrate beyond 40 Gbit/s, which is the practical limit set by electronics today. • By performing processing in the optical rather than the electrical domain, the bit rate may be increased. Also there may be advantages in terms of flexibility, management issues and price. • Devices based on semiconductors, and in particular on active semiconductors devices (lasers and amplifiers), are very suitable for all optical processing - they are compact and have strong optical nonlinearities. TC-TIST meeting, Thessaloniki, June 2002

  4. + + + + + + + + + + + + – – – – – – – – – – – – Signal processing using optical amplifier I Gain G G0 P N 0 Psignal The gain of the amplifier can be controlled optically TC-TIST meeting, Thessaloniki, June 2002

  5. Objectives • Development and application of measurement techniques to determine the suitability of active photonic semiconductor components for optical signal processing • Development and application of modeling methods for nonlinear active semiconductor components. Analysis of experimental results – towards tools for design and optimization. TC-TIST meeting, Thessaloniki, June 2002

  6. Action data • Start: September 30, 1998. End: September 29, 2002 • 17 Signatory countries. • 5 non-COST countries participating. • 14 short term missions (3 more expected before Sep. 2002) • 42 publications (papers and conference contributions) • 8 management committee meetings, 6 WG meetings • 3 open workshops (50 – 100 participants) TC-TIST meeting, Thessaloniki, June 2002

  7. Topics considered • Comparison of bulk, quantum well, quantum wire and quantum dot materials for all-optical ultrafast processing; • Development of design criteria for components and integrated subsystems in respect to a particular functionality; • Study of ultrafast all-optical demultiplexing based on cross-gain, cross-phase and four-wave mixing in semiconductor optical devices. Comparison of these schemes, as well as comparison to other techniques (e.g. electroabsorption modulators); • Study of the potential offered by all-optical devices based on cross-phase, cross-gain modulation and four-wave mixing, and comparison of their performance with the requirements of the various possible configurations for WDM and TDM networks; • Study and design of semiconductor devices for the generation and the control of ultrafast optical pulses. TC-TIST meeting, Thessaloniki, June 2002

  8. Organization WG1 Modeling WG2 Characterisation WG3 Fabrication • Compare measurements • Round-robin exercise • Pulse saturation • Pump-probe meas. • SOAs Design Fabrication Devices for r-r exercise • Compare models • Common exercises • Pulse propagation • Fast dynamics • Interferometers TC-TIST meeting, Thessaloniki, June 2002

  9. Organization ... dynamics Two phases: I: Sep. 1998 – Oct. 2000 II: Oct. 2000 – Sep. 2002 Action chairman New Action vice chair New (from May 2001) WG1 chair New WG1 vice chair New WG2 chair New..... + second change WG2 vice chair New..... + second change WG3 chair WG3 merged with WG2 WG3 vice chair Many key persons changed to start-ups in spring 2000. Decided to continue action – emphasis on STMs, workshop. TC-TIST meeting, Thessaloniki, June 2002

  10. Economic dimension Budget of approximately 50 kEURO per year. In 2001, an unspent amount of 20 kEURO was returned to Brussels. Reasons: Decreased level of activity and very late arrival of grant (1 month before end of grant period). Main part of budget spent on: Reimbursement of MC members Short term missions Invited speakers at workshops TC-TIST meeting, Thessaloniki, June 2002

  11. Workshops COST 267 workshop ”Semiconductor Devices for Optical Signal Processing”, 50 participants (Rome, April 22, 1999) Common COST 266-267 workshop “Optical Signal Processing in Photonic Networks”, 100 participants(Berlin, April 5 – 7, 2000) COST 267 / International workshop“Optical Signal Processing”,80 participants (Kgs. Lyngby, Nov. 29–30, 2001) Common ACTS/COST267-268 workshop “Advanced Photonic Components and Subsystems” organized by the ACTS project HORIZON (Brussels, May 5, 1999) Proceedings of the workshops are available (through Website for Berlin and Lyngby workshops)

  12. Short term missions • H. Soto, from ENST Paris to ETH Zurich. October 1999 • Laurent Schares, from ETH Zurich to Nat. Tech., Athens. November 1999 • Lorenzo Occhi, from ETH Zurich to HHI Berlin. January 2000 • Laurent Schares, from ETH Zurich to HHI Berlin. January 2000 • Kresten Yvind, from Research Center COM to HHI Berlin. April 2000 • Hovik Baghdasaryan, from Fern University to U. Politech.Valencia . April 2000 • George Toptchiyski,from TU Berlin to Research Center COM September 2000 • Ricardo Scollo, from Politecnico Milan to ETH ZurichJune 2001 • Mariangela Gioannini, from Politecnico di Torino to HHI Berlin June 2001 • Jan de Merlier, from IMEC Gent to Research Center COMAugust 2001 • Laurent Schares, from ETH to HHI Berlin April 2002 • Sean O’Duill, from Univ. College Dublin to Univ. Of Rome May 2002 • Mariangela Gioannini, from Politecnico di Torino to HHI Berlin May 2002 • Jan de Merlier, from IMEC Gent to Politecnico di Torino June 2002 • 3 additional STMs are expected before end of action (Sept. 2002) TC-TIST meeting, Thessaloniki, June 2002

  13. Key results Work well described by MoU – but less activity than anticipated. WG1: Development and application of theoretical models for describing pulse propagation and interferometer dynamics. Inputs to pre-defined modelling exercise. WG2: Round-robin exercises. 16 SOAs (10 MQW, 6 bulk) from 4 companies (JDS-Uniphase, Opto-Speed, Corning, Alcatel) measured by 13 institutions. Comparison of saturation effects (vs length, bulk/QW), recovery times, propagation effects. STMs: ... + Modelocked lasers for short pulse generation, new devices for optical switching, ... TC-TIST meeting, Thessaloniki, June 2002

  14. TC-TIST meeting, Thessaloniki, June 2002

  15. TC-TIST meeting, Thessaloniki, June 2002

  16. Self-evaluation (preliminary) Main successes: Short Term Missions! Good for initiating collaboration. Round-robin exercise; high quality devices, possibility for comparison of measurements ... and new investigations. Three well-attended workshops with invited talks. Promising field – with consequences for COST activity. Drawbacks Active research field, where many groups are already pre- occupied by (IST) projects (with ”real money”). Too specific focus from the start – problem when participation was downsized. Key difficulties encountered Change of organization – and reduction of participants. Late arrival of grants. Difficult to get full committment – salary would help.

  17. New action? • Discussions between COST 267 and 268 on proposing a new action within the photonics domain have been initiated. • Possible title: Nanoscale and ultrafast photonics • Study of ultrafast nanophotonics towards applications in the high capacity photonic communication infrastructure; forum to bring forward novel topics such as advanced optical signal processing and exploratory technologies based on nanophotonics • Topics of particular interest for COST 267 participants: • - high-frequency limits of lasers and amplifiers, ultrafast dynamics • - investigation and application of high-speed nonlinearities in nanophotonic devices; quantum dot amplifiers • - novel concepts for switching in active semiconductor devices

  18. Engineering of the material – quantum dots Atom Semiconductor Quantum Well Quantum dot TC-TIST meeting, Thessaloniki, June 2002

  19. I Quantum dot optical devices Prospects: - enhanced light-matter interaction - control of material properties - novel quantum devices - improved laser properties - ! - high-speed amplifiers - ? TC-TIST meeting, Thessaloniki, June 2002

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