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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Coupling of a semiconductor laser to a single-mode fiber

Yu, Nu 02 1900 (has links) (PDF)
M.S. / Electrical Engineering / The efficient coupling between a semiconductor laser and a single-mode fiber is a key element for fully utilizing the single-mode fiber for the optical communication. In this thesis, the Gaussian beam approach is used for analyzing the coupling of a single-mode laser diode to a single-mode optical fiber by a microlens. Two analytical methods based on both the ABCD law and the diffraction theory are presented. The effect of a microlens on both the phase and amplitude of a Gaussian beam are discussed in detail. The presented analysis specifies the optimum coupling in terms of laser and fiber parameters and the laser to fiber distance. Furthermore, the coupling efficiencies achievable in hemispheric and etched conical microlenses systems are explicitly compared. The present analysis shows that a coupling efficiency as high as 62% is achievable with the optimal choice of laser and fiber parameters. Additionally, theoretically obtained coupling efficiency is compared with the experimental data for both butt and etched fibers.

Measurement and computer simulation of the farfield patterns for turning-mirror surface-emitting diode lasers

Apte, Vibhavari 08 1900 (has links) (PDF)
M.S. / Electrical Engineering / Surface-emitting laser diodes are of interest for various applications such as monolithic two-dimensional arrays and optical interconnects for integrated optics. Therefore, it is essential to characterize these lasers. The farfield radiation pattern is one of the important characteristics of a laser diode. In this thesis the farfield of a surface-emitting laser diode with a turning mirror is modeled and measured. The computer simulation uses a rigorous theoretical expression for the field at the output mirror laser-air interface derived by Davies and Walpole and then using a modified form of the Kirchoff diffraction integral to generate the farfield. The computer modeling is done for both flat 45° and parabolic turning mirrors. Experimental data were also obtained for a surface-emitter with a 45° straight turning mirror. This mirror was fabricated using the focused ion beam micromachining technique developed at OGC. In the case of the parabolic turning mirror, the experimental results published by Liau and Walpole were used. A comparison of theoretical and experimental results for the two shapes of mirrors is also presented.

A dual-frequency diode laser displacement sensor

Hwang, Nam 22 June 1990 (has links)
Graduation date: 1991

Etude des modes de perturbation et susceptibilité des circuits numériques aux collisions de particules et aux attaques laser

Leroy, Damien Dandache, Abbas. January 2006 (has links) (PDF)
Thèse de doctorat : Electronique : Metz : 2006. / Thèse soutenue sur ensemble de travaux. Bibliogr. p. 137-144. Index des ill. p.13-15. Index des tables p. 17. Liste des acronymes p. 145-146.

Determining spatial modes of semiconductor lasters using spatial coherence

Warnky, Carolyn May. January 2002 (has links)
Thesis (Ph. D.)--Ohio State University, 2002. / Title from first page of PDF file. Document formatted into pages; contains xv, 145 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Betty Lisle Anderson, Dept. of Electrical Engineering. Includes bibliographical references (p. 140-145).

Ultrafast coherent transients & excited state dynamics in gases and solids

Dawson, Daniel Richard. January 1978 (has links)
Thesis (Masters)--California Institute of Technology, 1978. / Title from home page. Viewed 02/09/10. Includes bibliographical references.

Instability and thermal effect in vertical cavity surface emitting laser /

Wong, Wing-nin. January 2002 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2002. / Includes bibliographical references.

Material growth and characterization of GaAsSb on GaAs grown by MOCVD for long wavelength laser applications

Noh, Min-soo 28 August 2008 (has links)
Not available / text

All epitaxial mode and current confined semiconductor laser using selective fermi level pinning

Ahn, Jaemin 28 August 2008 (has links)
Not available / text


Hamil, Roy Anthony January 1980 (has links)
No description available.

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