On-line evaluation of mode field distribution in optical fibers

Modal domain analysis has gained special attention over the years due to its immense value both in fiber-optic sensor technology and communication systems. This presentation is aimed at reviewing the research done in that area so far and at describing a data acquisition system that can be used extensively for such analysis. This work primarily concentrates on the capabilities of the PN-2304 OPTOMATION II system in the study of mode coupling and transient distance analysis in graded-index optical fibers, as well as microbending loss measurements and phase modulation effects in a fiber guiding four modes. While the results of these measurements have been useful in themselves, the performance of the data acquisition system has been exploited to a great extent thus rendering a sophisticated tool for modal distribution studies. The system has been found useful in fiberdyne measurements and speckle pattern analysis thus leading to information on the propagating modes. Chapters I and 2 give a brief introduction to fiber optic systems and mode theory while Chapter 3 reviews the work already done in that area. Chapter 4 describes the PN-2304 OPTOMATION II and its capabilities in modal analysis and Chapter 5 reports the various measurements made using the system and their results.

Name thesis:degree_name

M.S.

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Electrical Engineering

Department dc:contributor.department

Electrical Engineering

Grantor dc:publisher

Virginia Polytechnic Institute and State University

Year dc:date.issued

1986

Author dc:creator

• Sankar, Ashok

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10919/106139

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/106139