Alan Mickelson | University of Colorado, Boulder (original) (raw)

Papers by Alan Mickelson

Electrooptic coefficients are sensitive to local crystal structure and therefore macroscopic defe... more Electrooptic coefficients are sensitive to local crystal structure and therefore macroscopic defects. The Electrooptic sampling technique can therefore determine some information concerning precipitates that may be formed during material processing. In past work, we can infer that Electrooptic coefficients can be reduced by defect influenced diffusion of Ohmic contact material in GaAs. In this work, the mechanism of proton exchange (indiffused H{sup +} ions) via diffusion results in a disruption of the Electrooptic coefficient in the LiNbO{sub 3} crystal which can then be detected by an Electrooptic sampling probe.

Conference on Lasers and Electro-Optics, Apr 24, 1989

Data gathered from a site visit to a proposed internet distribution network installation in the W... more Data gathered from a site visit to a proposed internet distribution network installation in the Western Highlands Province of Papua New Guinea are interspersed throughout the sections of this paper. Motivation for the IEEE Smart Village (ISV) program is the topic of the introduction. ISV arranged for an assessment of the site by an IEEE volunteer. A volunteer, paper author Alan Mickelson, visited the site in May of 2017. The presentation begins with some background on Information and Communication Technology for Development (ICTD). The presentation continues with a description of the area in question, which is located in the Western Highlands of Papua New Guinea near Mount Hagen, PNG. Tentative pre-assessment plans for an educational and health network in this rural area of Papua New Guinea are outlined. This education and health network is envisioned to be part of a larger sustainable development plan that involves micro-grids for renewable electrical power. Discussion of some enumerated technical issues ensues. Presentation of some technical alternatives to the pre-assessment plan elucidates that the appropriateness of any technical solution is sensitive to the nature of the community being served and the manner in which the plan is managed. A discussion of development practices then includes an overview of recent development theory, some consideration of present day best practices. The summary reviews project inconsistencies with some suggestions for moving forward.

Institute of Physics Pub. eBooks, 1996

The sixth in an international series of meetings, brings together researchers studying defect inh... more The sixth in an international series of meetings, brings together researchers studying defect inhomogeneities in semiconductor materials and devices. Defect inhomogeneities affect the performance of both as grown and processed semiconductors. This volume aims to provide the researcher with an overview of recent mapping and microscopy techniques available for the study of such defects and will help understanding of the effect of such defects on device performance. Topics covered include: optical, electrical and acoustical substrate defect imaging techniques, as applied to semiconductor substrates, epilayers, nanostructures and devices; techniques for processing quantities of data coming automated defect testing methods; and correlation of device performance with defect density and distribution.

National Radio Science Meeting, 1993

NIST Interagency/Internal Report (NISTIR) -, 1988

Proceedings of SPIE, Jan 5, 1990

ABSTRACT

Proceedings of SPIE, Jun 22, 1989

We report on a general theory describing the effect of external optical feedback on the steady-st... more We report on a general theory describing the effect of external optical feedback on the steady-state noise characteristics of single-mode semiconductor lasers. The theory is valid for arbitrarily strong feedback and arbitrary optical feedback configuration and spectrum. A generalized Langevin rate equation is derived. The equation is, in general, infinite order in d / d t constituting an infinite-order correction to the low-frequency weak-feedback analysis. The general formalism includes relaxation oscillations, and allows us to analyze the effect of feedback on both the laser linewidth, frequency noise, relative intensity noise, and the relaxation oscillation sidebands in the field spectrum. The theory is applied to two important feedback configurations; the laser coupled to a single mirror and the laser coupled to a high-Q cavity. The analysis includes excess low-frequency noise due to temperature fluctuations in the laser chip.

Proceedings of SPIE, Jun 1, 1990

ABSTRACT

j: REPORT DOCUMENTATION PAGEREDWTUIN 2. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER AFWL R-7... more j: REPORT DOCUMENTATION PAGEREDWTUIN 2. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER AFWL R-79-2 4. TITLE (mid Subtitle) S YEO EOT&PRO OEE ON ELECTROMAGNETIC WAVES IN CHIRAL MEDIA. Final),fepe't.-9-WrRFOuRNMO! ORO. REPORT NUMBER 7. AUTHORts QS.

A serial, stored program, optical computer has been designed [1] and implemented [2] using LiNbO3... more A serial, stored program, optical computer has been designed [1] and implemented [2] using LiNbO3 electro-optic directional coupler switches. Detector, amplifier and driver electronics at each electro-optic switch adapt it to optical control, so that all inter-switch signals are optical. The demonstrated machine uses discrete components, and glass fiber forms both interconnection and delay line memory. This paper will project the properties of an integrated version of this computer.

Optical Society of America Annual Meeting, 1990

Coherent guided-wave optical systems offer significant advantages for use with phased-array drive... more Coherent guided-wave optical systems offer significant advantages for use with phased-array drive and readout schemes. Single-side-band modulation of received fields allows for optical mixing of the microwave signals through Butler-matrix techniques with the attendant low loss and high resolution of optics. Such methods obviate the need for adaptive antenna processing and also produce a baseband signal at the output of an optical detector. Coherent drive allows for phase shifting to be performed at optical, rather than microwave, wavelengths, thereby allowing for compact, high- bandwidth true-time-delay, integrated-optical phase shifting. Heterodyning at the antenna-element end allows one to use a high-power locked local oscillator, thereby minimizing any need for at-element microwave amplification. Many of the elements necessary to realize such photonic array control schemes already exist and, in the near future, should become monolithically integrable, allowing for fiber-compatible modular construction of various drive schemes. We will discussion the performance of the various system elements, including those fabricated and tested in our laboratory as well as others for which data is available, and thereby project eventual system performance in terms of the standard phased-array performance measures.

Wiley Encyclopedia of Electrical and Electronics Engineering, Dec 27, 1999

Electronics Letters, 1981

Certain results of a theory of the backscattering process in multimode fibres are discussed. Calc... more Certain results of a theory of the backscattering process in multimode fibres are discussed. Calculated near-field intensities of backscattered waves are presented. The dependence of the backscattered power on diameter perturbations is calculated and shown to agree with the empirically determined relation.

Electrooptic coefficients are sensitive to local crystal structure and therefore macroscopic defe... more Electrooptic coefficients are sensitive to local crystal structure and therefore macroscopic defects. The Electrooptic sampling technique can therefore determine some information concerning precipitates that may be formed during material processing. In past work, we can infer that Electrooptic coefficients can be reduced by defect influenced diffusion of Ohmic contact material in GaAs. In this work, the mechanism of proton exchange (indiffused H{sup +} ions) via diffusion results in a disruption of the Electrooptic coefficient in the LiNbO{sub 3} crystal which can then be detected by an Electrooptic sampling probe.

Conference on Lasers and Electro-Optics, Apr 24, 1989

Data gathered from a site visit to a proposed internet distribution network installation in the W... more Data gathered from a site visit to a proposed internet distribution network installation in the Western Highlands Province of Papua New Guinea are interspersed throughout the sections of this paper. Motivation for the IEEE Smart Village (ISV) program is the topic of the introduction. ISV arranged for an assessment of the site by an IEEE volunteer. A volunteer, paper author Alan Mickelson, visited the site in May of 2017. The presentation begins with some background on Information and Communication Technology for Development (ICTD). The presentation continues with a description of the area in question, which is located in the Western Highlands of Papua New Guinea near Mount Hagen, PNG. Tentative pre-assessment plans for an educational and health network in this rural area of Papua New Guinea are outlined. This education and health network is envisioned to be part of a larger sustainable development plan that involves micro-grids for renewable electrical power. Discussion of some enumerated technical issues ensues. Presentation of some technical alternatives to the pre-assessment plan elucidates that the appropriateness of any technical solution is sensitive to the nature of the community being served and the manner in which the plan is managed. A discussion of development practices then includes an overview of recent development theory, some consideration of present day best practices. The summary reviews project inconsistencies with some suggestions for moving forward.

Institute of Physics Pub. eBooks, 1996

The sixth in an international series of meetings, brings together researchers studying defect inh... more The sixth in an international series of meetings, brings together researchers studying defect inhomogeneities in semiconductor materials and devices. Defect inhomogeneities affect the performance of both as grown and processed semiconductors. This volume aims to provide the researcher with an overview of recent mapping and microscopy techniques available for the study of such defects and will help understanding of the effect of such defects on device performance. Topics covered include: optical, electrical and acoustical substrate defect imaging techniques, as applied to semiconductor substrates, epilayers, nanostructures and devices; techniques for processing quantities of data coming automated defect testing methods; and correlation of device performance with defect density and distribution.

National Radio Science Meeting, 1993

NIST Interagency/Internal Report (NISTIR) -, 1988

Proceedings of SPIE, Jan 5, 1990

ABSTRACT

Proceedings of SPIE, Jun 22, 1989

We report on a general theory describing the effect of external optical feedback on the steady-st... more We report on a general theory describing the effect of external optical feedback on the steady-state noise characteristics of single-mode semiconductor lasers. The theory is valid for arbitrarily strong feedback and arbitrary optical feedback configuration and spectrum. A generalized Langevin rate equation is derived. The equation is, in general, infinite order in d / d t constituting an infinite-order correction to the low-frequency weak-feedback analysis. The general formalism includes relaxation oscillations, and allows us to analyze the effect of feedback on both the laser linewidth, frequency noise, relative intensity noise, and the relaxation oscillation sidebands in the field spectrum. The theory is applied to two important feedback configurations; the laser coupled to a single mirror and the laser coupled to a high-Q cavity. The analysis includes excess low-frequency noise due to temperature fluctuations in the laser chip.

Proceedings of SPIE, Jun 1, 1990

ABSTRACT

j: REPORT DOCUMENTATION PAGEREDWTUIN 2. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER AFWL R-7... more j: REPORT DOCUMENTATION PAGEREDWTUIN 2. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER AFWL R-79-2 4. TITLE (mid Subtitle) S YEO EOT&PRO OEE ON ELECTROMAGNETIC WAVES IN CHIRAL MEDIA. Final),fepe't.-9-WrRFOuRNMO! ORO. REPORT NUMBER 7. AUTHORts QS.

A serial, stored program, optical computer has been designed [1] and implemented [2] using LiNbO3... more A serial, stored program, optical computer has been designed [1] and implemented [2] using LiNbO3 electro-optic directional coupler switches. Detector, amplifier and driver electronics at each electro-optic switch adapt it to optical control, so that all inter-switch signals are optical. The demonstrated machine uses discrete components, and glass fiber forms both interconnection and delay line memory. This paper will project the properties of an integrated version of this computer.

Optical Society of America Annual Meeting, 1990

Coherent guided-wave optical systems offer significant advantages for use with phased-array drive... more Coherent guided-wave optical systems offer significant advantages for use with phased-array drive and readout schemes. Single-side-band modulation of received fields allows for optical mixing of the microwave signals through Butler-matrix techniques with the attendant low loss and high resolution of optics. Such methods obviate the need for adaptive antenna processing and also produce a baseband signal at the output of an optical detector. Coherent drive allows for phase shifting to be performed at optical, rather than microwave, wavelengths, thereby allowing for compact, high- bandwidth true-time-delay, integrated-optical phase shifting. Heterodyning at the antenna-element end allows one to use a high-power locked local oscillator, thereby minimizing any need for at-element microwave amplification. Many of the elements necessary to realize such photonic array control schemes already exist and, in the near future, should become monolithically integrable, allowing for fiber-compatible modular construction of various drive schemes. We will discussion the performance of the various system elements, including those fabricated and tested in our laboratory as well as others for which data is available, and thereby project eventual system performance in terms of the standard phased-array performance measures.

Wiley Encyclopedia of Electrical and Electronics Engineering, Dec 27, 1999

Electronics Letters, 1981

Certain results of a theory of the backscattering process in multimode fibres are discussed. Calc... more Certain results of a theory of the backscattering process in multimode fibres are discussed. Calculated near-field intensities of backscattered waves are presented. The dependence of the backscattered power on diameter perturbations is calculated and shown to agree with the empirically determined relation.