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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 21 — Oct. 8, 2012
  • pp: 22987–22996

Tunable coherence-free microwave photonic bandpass filter based on double cross gain modulation technique

Erwin H. W. Chan  »View Author Affiliations

Optics Express, Vol. 20, Issue 21, pp. 22987-22996 (2012)

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A tunable, coherence-free, high-resolution microwave photonic bandpass filter, which is compatible to be inserted in a conventional fiber optic link, is presented. It is based on using two cross gain modulation based wavelength converters in a recursive loop. The double cross gain modulation technique solves the semiconductor optical amplifier facet reflection problem in the conventional recursive structure; hence the new microwave photonic signal processor has no coherent interference and no phase-induced intensity noise. It allows arbitrary narrow-linewidth telecommunication-type lasers to be used while enabling stable filter operation to be realized. The filter passband frequency can be tuned by using a wavelength tunable laser and a wavelength dependent time delay component. Experimental results demonstrate robust high-resolution bandpass filter operation with narrow-linewidth sources, no phase-induced intensity noise and a high signal-to-noise ratio performance. Tunable coherence-free operation of the high-resolution bandpass filter is also demonstrated.

© 2012 OSA

OCIS Codes
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(350.4010) Other areas of optics : Microwaves
(070.2025) Fourier optics and signal processing : Discrete optical signal processing
(070.2615) Fourier optics and signal processing : Frequency filtering

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 21, 2012
Revised Manuscript: September 3, 2012
Manuscript Accepted: September 8, 2012
Published: September 24, 2012

Erwin H. W. Chan, "Tunable coherence-free microwave photonic bandpass filter based on double cross gain modulation technique," Opt. Express 20, 22987-22996 (2012)

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