Apparatus for measuring differential mode delay of multimode...

Details Apparatus for measuring differential mode delay of multimode... Apparatus for measuring differential mode delay of multimode...

2008-05-06

2008-05-06

Lyons, Michael A. (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S484000, C356S073100

Reexamination Certificate

active

07369249

ABSTRACT:
Disclosed herein is an apparatus for measuring the differential mode delay of multimode optical fiber. The apparatus includes a tunable laser source, an interferometer, a data collecting device, and a computer. The tunable laser source outputs light, frequencies of which vary linearly. The interferometer generates multimode light and single mode light by separating light, which is output from the tunable laser source, transmitting the multimode light and the single mode light to the multimode optical fiber, which is a measurement target, and a single mode path, which is a reference, and generating a beating signal by causing the multimode light and the single mode light to interfere with each other. The data collecting device collects the beating signal from the interferometer. The computer converts the frequency components of the beating signal into components in a time domain, and calculating the mode delay of the multimode light.

REFERENCES:
patent: 7023556 (2006-04-01), Dorrer
patent: 2003/0147607 (2003-08-01), De Jongh et al.
patent: 2007/0159620 (2007-07-01), Takenaga

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