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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 7 — Apr. 1, 2013
  • pp: 1164–1166

Shifted dispersion-induced radio-frequency fading in microwave photonic filters using a dual-input Mach–Zehnder electro-optic modulator

Liwei Li, Xiaoke Yi, Thomas X. H. Huang, and Robert A. Minasian  »View Author Affiliations


Optics Letters, Vol. 38, Issue 7, pp. 1164-1166 (2013)
http://dx.doi.org/10.1364/OL.38.001164


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Abstract

A simple microwave photonic processor structure with single passband response, and widely tunable capability, is demonstrated. It is based on the principle of shifted dispersion-induced radio-frequency (RF) fading by using a dual-input Mach–Zehnder electro-optic modulator (EOM) that is fed from a broadband optical source with unbalanced input fiber lengths into the upper and lower arms of the EOM, in combination with a dispersive medium. This topology consequently produces a spectral response equivalent to the curve of the dispersion-induced RF fading that is shifted from the conventional baseband location to high frequencies. Therefore, an equivalent single passband is formed without the requirement of the conventional tap coefficients. Experimental results verify the structure and demonstrate a continuously tunable microwave filter exhibiting shape invariance and a single passband. In addition, the filter response sidelobe suppression is also significantly improved by applying a Gaussian windowed profile to the broadband optical source.

© 2013 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(070.2615) Fourier optics and signal processing : Frequency filtering
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: December 4, 2012
Revised Manuscript: March 3, 2013
Manuscript Accepted: March 5, 2013
Published: April 1, 2013

Citation
Liwei Li, Xiaoke Yi, Thomas X. H. Huang, and Robert A. Minasian, "Shifted dispersion-induced radio-frequency fading in microwave photonic filters using a dual-input Mach–Zehnder electro-optic modulator," Opt. Lett. 38, 1164-1166 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-7-1164

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