Title :
Measurement of launching efficiency into multimode optical fibers using semiconductor laser diodes
Author :
Sunak, Harish R D
Author_Institution :
Dept. of Electr. Eng., Rhode Island Univ., Kingston, RI, USA
fDate :
12/1/1988 12:00:00 AM
Abstract :
A detailed and systematic study has been carried out of the launching efficiency of light, from semiconductor laser diodes into graded-index multimode optical fiber waveguides. Four different terminations of the fibers were investigated: plane-ends, hemispherical ends, taper-with-hemisphere ends, and roof-top (RT) ends. Besides launching efficiency, the parameters of interest were the various misalignments, such as axial, lateral, and angular, between laser and fiber, and the effect of these to produce a reduction in the launching efficiency. It is shown that RT fibers increase the launching efficiency considerably but rotational optimization of the fiber about its axis is essential. It is noted that this is a considerable disadvantage as most of the other techniques considered do not require the optimization
Keywords :
optical fibres; optical testing; optical variables measurement; semiconductor junction lasers; graded-index multimode optical fiber waveguides; hemispherical ends; launching efficiency; misalignments; multimode optical fibers; plane-ends; roof top ends; rotational optimization; semiconductor laser diodes; taper-with-hemisphere ends; Apertures; Diode lasers; Fiber lasers; Helium; Loss measurement; Optical fiber communication; Optical fibers; Optical waveguides; Semiconductor lasers; Tellurium;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
