System for measuring an optical loss in a single mode optical fi

Details System for measuring an optical loss in a single mode optical fi System for measuring an optical loss in a single mode optical fi

1980-04-29

1981-12-08

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356434, G01N 2184

Patent

active

043044891

ABSTRACT:
An optical loss in a single mode optical device is measured by utilizing multi-mode equipment. The present system comprises of an optical source (1), a sample (30) to be tested, a reference optical attenuator (31) for replacing the optical loss in the sample (30), a first optical switch (40) provided between the optical source (1) and the sample (30) through a single mode optical fiber, a second optical switch (41) provided between the sample (30) and the light receiver (2) through the multi-mode optical fiber, said reference optical attenuator (31) being provided between the first optical switch (40) and the second optical switch (41) so that the optical path is switched either to the sample (30) or to the reference attenuator (31), the optical fiber between the sample (30) and the second optical switch (41) and the optical fiber connected to the input and the output of the reference attenuator (31) being a multi-mode optical fiber.

REFERENCES:
Research Application Report vol. 27, No. 2 (1978) published by Nippon Telegraph & Telephone Public Corp. pp. 394-395.
"Measurement of Baseband Frequency Response of Multimode Fibre by Using a New Type of Mode Scrambler."
Tokuda et al., Electronics Letters, vol. 13, No. 5 pp. 146-147, Mar. 3, 1977.

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