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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 17 — Aug. 17, 2009
  • pp: 14909–14917

Bandwidth enhancement of electro-optic sensing using high-even-order harmonic sidebands

Dong-Joon Lee and John F. Whitaker  »View Author Affiliations


Optics Express, Vol. 17, Issue 17, pp. 14909-14917 (2009)
http://dx.doi.org/10.1364/OE.17.014909


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Abstract

We demonstrate that the bandwidth of an electro-optic sensing system can be significantly enhanced by the use of even-order harmonic sidebands (order > 2) produced on an optical-carrier probe beam with two cascaded electro-optic modulators. The sensing frequency range may be routinely expanded by at least four times, with respect to the use of fundamental-harmonic sidebands, by enhancing the nonlinearity of high-order-harmonic electro-optic modulation. The creation of harmonic modulation sidebands up to the sixth order of the drive frequency on a laser-diode output is described analytically, as is photonic heterodyne down-conversion of microwave signals using these high-order even harmonics within an electro-optic sensor crystal. The nonlinear harmonics serve as beneficial local-oscillator modulations for broadband electro-optic detection of microwave fields without nonlinear distortion. Transverse near-field distributions from an 18.5 GHz patch antenna are extracted using the fourth- (sixth-) order-harmonic sidebands at the output of the cascaded electro-optic modulators driven with a 4.6- (3.1-) GHz continuous-wave input.

© 2009 Optical Society of America

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(350.4010) Other areas of optics : Microwaves
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: April 30, 2009
Revised Manuscript: June 19, 2009
Manuscript Accepted: July 22, 2009
Published: August 7, 2009

Citation
Dong-Joon Lee and John F. Whitaker, "Bandwidth enhancement of electro-optic sensing using high-even-order harmonic sidebands," Opt. Express 17, 14909-14917 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-17-14909


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References

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