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ERIC Number: EJ901509
Record Type: Journal
Publication Date: 2010-Nov
Pages: 8
Abstractor: As Provided
Reference Count: 16
ISSN: ISSN-0143-0807
Measuring the Dispersion Curve of a PMMA-Fibre Optic Cable Using a Dye Laser
Zorba, Serkan; Farah, Constantine; Pant, Ravi
European Journal of Physics, v31 n6 p1369-1376 Nov 2010
An advanced undergraduate laboratory experiment is outlined which uses a dye laser to map out the chromatic dispersion curve of a polymethyl methacrylate (PMMA) optical fibre. Seven different wavelengths across the visible spectrum are employed using five different dyes. The light pulse is split into two pulses, one to a nearby photodetector and the other coupled to the optical fibre cable at the end of which there is another photodetector. The difference in time of arrival at the detectors is used to compute the speed of light in the fibre for a given colour. In addition to a pedagogically simple and intuitive demonstration of the measurement of index of refraction, the use of a long fibre eliminates the need to direct the dangerous UV/visible laser pulse beam across a classroom, as is usually done in similar experiments. Ways to avoid systematic errors and other technical pitfalls--such as ringing oscillations--are presented. (Contains 8 figures.)
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A