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Differential Rayleigh scattering method for measurement of polarization and intermodal beat length in optical waveguides and fibers |
Applied Optics, Vol. 50, Issue 17, pp. 2594-2600 (2011)
http://dx.doi.org/10.1364/AO.50.002594
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Abstract
We propose a modification of the Rayleigh scattering method, which allows for measurement of polarization and intermodal beat length in single-mode and few-mode channel waveguides and optical fibers. A significant sensitivity increase is achieved by taking two high-resolution photographs in oblique scattered light of π-shifted intensity distributions produced by interference of polarization or spatial modes and applying Fourier analysis to the differential image. In the case of polarization beat length measurements, the π-phase shift is obtained by switching the polarization state at the fiber input, while in intermodal measurements, the π-phase shifting is realized by changing the excitation conditions. The usefulness of the method for characterization of channel waveguides and optical fibers is demonstrated in several examples. Moreover, we show that the combination of the spectral interferometry method with the proposed method allows for broadband measurements of differential phase and group effective indices.
© 2011 Optical Society of America
OCIS Codes
(030.4070) Coherence and statistical optics : Modes
(060.2270) Fiber optics and optical communications : Fiber characterization
(100.2000) Image processing : Digital image processing
(160.5470) Materials : Polymers
(260.1440) Physical optics : Birefringence
(260.5430) Physical optics : Polarization
ToC Category:
Physical Optics
History
Original Manuscript: February 16, 2011
Revised Manuscript: March 24, 2011
Manuscript Accepted: March 31, 2011
Published: June 3, 2011
Citation
Marcin Szczurowski, Waclaw Urbanczyk, Maciej Napiorkowski, Petr Hlubina, Uwe Hollenbach, Heinrich Sieber, and Juergen Mohr, "Differential Rayleigh scattering method for measurement of polarization and intermodal beat length in optical waveguides and fibers," Appl. Opt. 50, 2594-2600 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-17-2594
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