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1550 nm transmissive/reflective surface-normal electroabsorption modulator arrays
Department of Industrial Nano- and Microtechnology, Acreo AB, Kista.
Department of Industrial Nano- and Microtechnology, Acreo AB, Kista.
Department of Industrial Nano- and Microtechnology, Acreo AB, Kista.
Department of Industrial Nano- and Microtechnology, Acreo AB, Kista.
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2006 (English)In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 42, no 1, 47-48 p.Article in journal (Refereed) Published
Abstract [en]

Arrays of surface-normal 1550 nm transmissive/reflective dual-function electroabsorption modulators based oil InGaAs/InAlAs coupled quantum wells are investigated for free-space and optical fibre communications. The modulators can readily be switched between transmissive or reflective mode by using a removable Au mirror, which provides flexibility in the optical system configuration for different applications. The modulators exhibit contrast ratio of 2:1 at 3 V driving bias and contrast ratio of 2:1 over 30 nm bandwidth at 6 V. The maximum contrast ratio of 4:1 is achieved at a 12 V driving voltage.

Place, publisher, year, edition, pages
2006. Vol. 42, no 1, 47-48 p.
Keyword [en]
Bandwidth; Electric potential; Energy absorption; Gold; Modulators; Optical fibers; Reflection; Semiconductor quantum wells; Wave transmission; Coupled quantum wells; Driving voltage; Electroabsorption modulator arrays; Optical system
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-7630DOI: 10.1049/el:20063504ISI: 000235322600031OAI: oai:DiVA.org:kth-7630DiVA: diva2:12715
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2010-08-02Bibliographically approved
In thesis
1. Surface-normal multiple quantum well electroabsorption modulators: for optical signal processing and asymmetric free-space communication
Open this publication in new window or tab >>Surface-normal multiple quantum well electroabsorption modulators: for optical signal processing and asymmetric free-space communication
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Electroabsorption is the physical phenomenon by which the absorption of light in a medium can be controlled by applying an electric field. The Quantum–Confined Stark Effect, which makes the absorption band–edge in quantum wells very field–dependent, together with the strong absorption peak provided by excitons, are the physical foundations for the success of electroabsorption modulators based on quantum well structures in telecommunication networks.

This thesis describes the design and fabrication of surface–normal electroabsorption modulation devices. The techniques needed to understand the design and fabrication of surface–normal multiple quantum well optical modulators are introduced, as are the various characterisation techniques used during and after the fabrication.

Devices for several types of applications have been designed, fabricated, characterised and in some cases integrated into optical systems:

– Two–dimensional arrays of 128´128 pixel amplitude modulators grown on GaAs substrates have been fabricated and characterised. Speeds of up to 11700 frames per second were demonstrated, limited by the output electronics of the computer interface.

– Large–area modulators grown on GaAs substrates for free–space optical communication were developed, with an active area of 2cm2 and a modulation speed of several megahertz. Contrast ratios up to 5:1 on full modulator areas were measured. Problems limiting the yield and modulation speed of such devices have been studied, and solutions to overcome them have been demonstrated.

– Large–area devices grown on InP substrates for free–space optical communication have been developed. Contrast ratios of up to 2:1 for transmissive types have been demonstrated.

– Devices consisting of two rows of pixels, grown on GaAs substrates, with an active area of 22mm´5mm, divided into 64 or 128 pixels per row have been developed. These amplitude modulation devices were designed for optical signal processing applications.

– One variant of these optical signal processing devices was also characterised as a ternary, binary amplitude and binary phase modulator array.

– The use of GaAs multiple quantum well optical modulators in a free–space optical retro–communication system has been studied. An opto–mechanical design for a modulating retro–reflector is described, allowing a large field of view in one direction using reflecting, resonant–cavity modulators for high contrast ratios.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. xxviii, 90 p.
Series
Trita-ICT/MAP, 2007:8
Keyword
spatial light modulators, quantum wells, optical resonator, Fabry–Pérot cavity, electroabsorption modulator, free–space optical communication
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-4532 (URN)
Public defence
2007-11-30, Sal N1, KTH-Electrum 3, Isafjordsgatan 28 a/D, Kista, 10:00
Opponent
Supervisors
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2010-08-02Bibliographically approved

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