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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 5 — May. 1, 2012
  • pp: 916–923

Frequency modulation background signals from fiber-based electro optic modulators are caused by crosstalk

Isak Silander, Patrick Ehlers, Junyang Wang, and Ove Axner  »View Author Affiliations


JOSA B, Vol. 29, Issue 5, pp. 916-923 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000916


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Abstract

Frequency modulated spectroscopy (FMS) performed by the use of fiber-coupled electro optic modulators (FC-EOMs) is often plagued by background signals that bring in noise and, by their temperature dependence, cause severe drifts. These signals cannot be zeroed out by the conventional technique of using a carefully adjusted polarizer that can be applied to free space electro optic modulators (EOMs). This can limit the use of FC-EOMs in high performance detection techniques. Here we provide an explanation to these background signals that is based upon crosstalk between various polarization directions of light in the fixed mounted polarization-maintaining fibers and the electro optic crystal. The description provides a basis for the previously demonstrated technique that utilizes an EOM regulated simultaneously by temperature and DC voltage to eliminate background signals from systems encompassing FC-EOMs.

© 2012 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2630) Fiber optics and optical communications : Frequency modulation
(130.3120) Integrated optics : Integrated optics devices
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6380) Spectroscopy : Spectroscopy, modulation
(140.3518) Lasers and laser optics : Lasers, frequency modulated

ToC Category:
Integrated Optics

History
Original Manuscript: October 21, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: January 18, 2012
Published: April 6, 2012

Citation
Isak Silander, Patrick Ehlers, Junyang Wang, and Ove Axner, "Frequency modulation background signals from fiber-based electro optic modulators are caused by crosstalk," J. Opt. Soc. Am. B 29, 916-923 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-5-916

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