Optimization of waveguide coupling lenses using lens design software.
Committee ChairShannon, Robert R.
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PublisherThe University of Arizona.
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AbstractThe coupling of a semi-conductor laser into a waveguide or a fiber has been studied extensively. It has been discussed that butt coupling, which is the simplest theoretical solution, usually presents challenging tolerancing problems. The addition of optical elements between the laser and waveguide is interesting since it provides beam magnification and can loosen some tolerances. However, this raises the cost of the coupling system; that is why it is important to thoroughly optimize a coupling lens system. Since the numerical aperture of the beam emitted by a laser diode is usually in the range 0.4-0.5, the control of the coupling system's aberrations becomes critical. Some authors have already included aberrations in their study of the coupling efficiency of specific configurations. Wagner and Tomlinson have published a rigorous and complete treatment of the problem. The subject of this dissertation is to present a practical, engineering method of treating the coupling problem while employing widely available conventional lens design software. It will be shown that the coupling efficiency of a system can be related to an apodized and normalized point spread function that can easily be calculated with lens design software. This means that lens design software can predict the coupling efficiency of any system, but most importantly, it can also be used to optimize and tolerance the system. Development, study and validation of the proposed technique will be presented as well as some examples and applications.
Degree ProgramOptical Sciences