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Surface-normal multiple quantum well electroabsorption modulators based on GaAs-related materials
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , xx, 66 p.
Series
Trita-MVT, ISSN 0348-4467 ; 2005:1
Keyword [en]
Mathematical optimization, systems theory, spatial light modulators, quantum wells, optical resonator, Fabry-Pérot
Keyword [sv]
Optimeringslära, systemteori
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-292OAI: oai:DiVA.org:kth-292DiVA: diva2:8656
Presentation
2005-02-22, Sal C1, KTH-Electrum, Kista, 10:00
Note
QC 20101206Available from: 2005-07-11 Created: 2005-07-11 Last updated: 2010-12-06Bibliographically approved
List of papers
1. Multiple quantum well spatial light modulators for correlation-based processors
Open this publication in new window or tab >>Multiple quantum well spatial light modulators for correlation-based processors
2001 (English)In: Proceedings of SPIE: The International Society for Optical Engineering, 2001, 314-364 p.Conference paper, Published paper (Refereed)
Abstract [en]

To be competitive with their electronic counterparts, correlation-based optical processors require very fast spatial light modulators (SLMs) that can perform simultaneously phase and amplitude modulation. Owing to their ultra-high speed, multiple quantum well (MQW) SLMs have been early identified as very good candidates. However, the coding domain of MQW SLMs is not widely known. We present here a study of available coding domains of MQW SLMs. We demonstrate that pure amplitude modulation, ternary [4, 0, +1) modulation and quaternary to, +1, e(i2pi/3), e(i4pi/3)) modulation are examples of coding domains that can be achieved by tuning a few parameters in the design of Fabry-Perot MQW modulators. We show that ternary and quaternary filters provide much better results than binary filters for the recognition of objects embedded in highly cluttered noise. Finally, we present a technique, the time-averaged pseudo-random encoding technique, which enables encoding of any complex filter onto a quaternary modulator. Combined with the time-averaged pseudo-random encoding technique, MQW SLMs may pave the way to the development of new optoelectronic correlator systems with improved speed and accuracy performance.

Series
Critical Reviews of Optical Science and Technology, ISSN 1018-1997 ; CR81
Keyword
spatial light modulators; optical pattern recognition; optical correlator
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-7624 (URN)000174742500015 ()0-8194-4123-6 (ISBN)
Conference
Optoelectronic Information Processing: Optics for Information Systems; Valencia; 28-30 May 2001
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2010-12-06Bibliographically approved
2. Multiple quantum well spatial light modulators design-fabrication-characterization
Open this publication in new window or tab >>Multiple quantum well spatial light modulators design-fabrication-characterization
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2001 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, San Diego, CA, 2001, Vol. 4457, 62-71 p.Conference paper, Published paper (Refereed)
Abstract [en]

Multiple quantum well spatial light modulators (MQW SLMs) are promising devices for future high-speed applications. We present results obtained with a single-pixel amplitude modulator. We discuss the status of our work on a 128x—128-pixel ternary SLM. This SLM will run at 10 kHz and have one low-reflectance level and two high reflectance levels with a phase difference of π. We also present a study of the relation between the coding domain and the structural design of modulators.

Place, publisher, year, edition, pages
San Diego, CA: , 2001
Keyword
Coding domain, GaAs, Quantum wells, Spatial light modulators, Optical design, Reflection, Semiconducting gallium arsenide, Semiconductor device manufacture, Semiconductor device structures, Semiconductor quantum wells, Multiple quantum well spatial light modulators, Phase difference, Reflectance levels, Single-pixel amplitude modulator, Light modulators
National Category
Computational Mathematics
Identifiers
urn:nbn:se:kth:diva-27035 (URN)10.1117/12.447739 (DOI)
Conference
Spatial Light Modulators: Technology and Applications; San Diego, CA; 31 July 2001 - 1 August 2001
Note
QC 20101206Available from: 2010-12-06 Created: 2010-12-06 Last updated: 2010-12-06Bibliographically approved
3. Two-dimensional GaAs/AlGaAs multiple quantum well spatial light modulators
Open this publication in new window or tab >>Two-dimensional GaAs/AlGaAs multiple quantum well spatial light modulators
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2003 (English)In: Acta optica sinica, Vol. 23, 339-340 p.Article in journal (Refereed) Published
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-7625 (URN)
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2010-12-06Bibliographically approved
4. Fabry-Perot electroabsorption modulators for high-speed free-space optical communication
Open this publication in new window or tab >>Fabry-Perot electroabsorption modulators for high-speed free-space optical communication
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2004 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 16, no 6, 1471-1473 p.Article in journal (Refereed) Published
Abstract [en]

Retroreflective modulators are key components in free-space optical communication systems between mobile platforms and users. Wide-aperture surface-normal electroabsorption modulators based on GaAs-AlGaAs quantum wells embedded in an asymmetric Fabry-Perot cavity ire designed and fabricated with a high yield. process on 10-cm wafers. It is shown that the modulator yield and its speed are improved significantly by a pixellated approach in which monolithic modulators are divided into 4-64 pixels. The fabricated 1.5 x 1.5 cm(2) devices exhibit contrast ratios of 8 dB at a driving voltage of 8 V and a modulation frequency higher than 10 MHz, which provides low noise and fast data transmission for long distance free-space optical communication.

Keyword
Electroabsorption modulator; Free-space optical communication; GaAs-AlGaAs multiple quantum wells (MQWs); High yield; Large aperture
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-7626 (URN)10.1109/LPT.2004.827855 (DOI)000221578300017 ()
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2017-12-14Bibliographically approved
5. GaAs-based multiple-quantum-well spatial light modulators fabricated by a wafer-scale process
Open this publication in new window or tab >>GaAs-based multiple-quantum-well spatial light modulators fabricated by a wafer-scale process
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2005 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 44, no 9, 1635-1641 p.Article in journal (Refereed) Published
Abstract [en]

The design, fabrication, and characterization of large, two-dimensional multiple-quantum-well modulator arrays are presented. Such arrays present a speed advantage compared with competing technologies such as liquid crystals and micromirrors, which are intrinsically limited to the kilohertz range. We discuss the design compromises to reach high-contrast, low-voltage swing optical structures compatible with complementary metal-oxide semiconductor-based integrated circuits and present experimental results. Contrast ratio of 5:1 (limited by the fill factor), variations in uniformity below 1 nm, and frame rates in excess of 10 kHz are demonstrated. Technology maturity for volume production is also discussed.

Keyword
Distributed bragg reflectors (DBR); Micromirrors; Two-dimensional multiple-quantum-well modulation arrays; Wafer-scale processing
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-7627 (URN)10.1364/AO.44.001635 (DOI)000227758000016 ()
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2017-12-14Bibliographically approved
6. A Modulating retro-reflector for free-space optical communication
Open this publication in new window or tab >>A Modulating retro-reflector for free-space optical communication
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2006 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 18, no 1, 85-87 p.Article in journal (Refereed) Published
Abstract [en]

We present modeling of a modulating retro-reflector for free-space optical communication, composed of a reflective resonant-cavity modulator and a corner cube. Although resonant-cavity modulators are sensitive to the angle of incidence of the light beam, we show that with the right geometrical arrangement, the field of view can be more than ten-fold that of the modulator. The modeling is validated by experimental data using a corner cube and a 14 x 14 mm(2) multiple quantum-well modulator.

Keyword
Modulation; Optical communication; Quantum-well devices
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-7629 (URN)10.1109/LPT.2005.860388 (DOI)000235899300028 ()
Note
QC 20100802Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2017-12-14Bibliographically approved

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