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Dissertation
Modal characterization of fiberoptic devices using an automated modal analyzer
Doctor of Philosophy (Ph.D.), Drexel University
Jun 1998
DOI:
https://doi.org/10.17918/00000374
Abstract
Characteristics of light, such as intensity, phase, polarization, and wavelength have been exploited in the development of fiberoptic devices. The use of the modal characteristics in a multimode fiber has been demonstrated for sensing and modulating applications. These devices use the change in the modal content as well as total optical throughput in fiber due to an external perturbation as a means of achieving the desired application. However, a scientific study or characterization of mode coupling as a function of various launching conditions and applied disturbances has not been performed. In the work reported here, a theoretical background is established, a method of performing a systematic experimental study of such devices is developed, and simple examples are investigated in order to relate the theoretical to the experimental results. Systematic study is necessary in order to optimize the fiberoptic modal sensitive devices. Results reveal some of the limitations of modal sensitive fiber optic sensors and considerations to enhance their sensitivity. Disturbances affecting the modes can mask the effect of the applied disturbance and must be isolated or minimized. Finally, study of a modified cladding on-fiber device combined with previous results revealed enhanced modal coupling attributable to an asymmetric fiber disturbance. Though this type of disturbance may be extremely difficult to model theoretically, such geometries will lead to more sensitive devices.
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Details
- Title
- Modal characterization of fiberoptic devices using an automated modal analyzer
- Creators
- Leah M. Akins
- Contributors
- Peter R. Herczfeld (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- x, 141 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Electrical (and Computer) Engineering [Historical]; Drexel University
- Other Identifier
- 991014970214704721