Chromatic dispersion measurement scheme having high frequency re

Details Chromatic dispersion measurement scheme having high frequency re Chromatic dispersion measurement scheme having high frequency re

1999-03-31

2000-07-11

Kim, Robert H.

Optics: measuring and testing

For optical fiber or waveguide inspection

356345, G01B 902

Patent

active

060880880

ABSTRACT:
A measurement scheme measures dispersive characteristics of optical components. The scheme includes modulation phase shift measurements performed on modulated optical carriers where the carrier frequency and the modulation frequency of the modulated optical carriers are adjusted to maintain a reference modulation sideband. A reference phase term is established by the reference modulation sideband in each of the modulation phase shift measurements. Phase indices of refraction at discrete optical frequencies of non-reference modulation sidebands are extracted from the modulation phase shift measurements. The extracted phase indices are used to calculate relative group delay and chromatic dispersion as measures of dispersive characteristics of the optical component. High timing resolution and high frequency resolution are achieved simultaneously through independent adjustment of the carrier frequency and the modulation frequency enabling optical components, including those having dispersive characteristics that are highly dependent on optical frequency, to be accurately characterized.

REFERENCES:
patent: 4556314 (1985-12-01), Stone
patent: 5406368 (1995-04-01), Horiuchi et al.
"Fiber Optic Test and Measurement", Chapter 12, Edited by Dennis Derickson, Prentice Hall PTR, 1998, ISBN 0-13-534330-5; Sec. 12.3, "Measuremnt of Chromatic Dispersion" pp. 479-485.
Leonard G. Cohen, "Comparison of Single-Mode Fiber Dispersion Measurement Techniques", Journal of Lightwave Technology, vol. LT-3, No. 5, Oct. 1985; pp. 958-966.

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