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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 21 — Nov. 1, 2013
  • pp: 4304–4307

Ultrahigh-Q microwave photonic filter with tunable Q value utilizing cascaded optical-electrical feedback loops

Jie Liu, Nan Guo, Zhaohui Li, Changyuan Yu, and Chao Lu  »View Author Affiliations


Optics Letters, Vol. 38, Issue 21, pp. 4304-4307 (2013)
http://dx.doi.org/10.1364/OL.38.004304


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Abstract

A microwave photonic filter with the highest reported quality factor (Q) value of 4895.31 is proposed and experimentally demonstrated by using two cascaded infinite impulse response (IIR) filters. Each IIR filter comprises both optical and electronic signals in a feedback loop and thus the loop length can be reduced without the need to consider the light coherence length. The Vernier effect enables a significant improvement of the free spectral ranges and Q values of the cascaded filter. The Q value of the proposed microwave photonic filter can be changed when the loop lengths of two cascaded filters are carefully adjusted. In addition, for a fixed Q, the frequency response of the filter can also be tuned by adjusting the bias of the Mach–Zehnder modulator in each loop.

© 2013 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(350.4010) Other areas of optics : Microwaves
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 30, 2013
Manuscript Accepted: August 28, 2013
Published: October 18, 2013

Citation
Jie Liu, Nan Guo, Zhaohui Li, Changyuan Yu, and Chao Lu, "Ultrahigh-Q microwave photonic filter with tunable Q value utilizing cascaded optical-electrical feedback loops," Opt. Lett. 38, 4304-4307 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-21-4304


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