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Opt Lett. 2006 Mar 15;31(6):709-11.

Tunable radio-frequency photonic filter based on an actively mode-locked fiber laser.

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Optical Communications Group, Institute of Telecommunications and Multimedia Applications, Universidad Polit├ęcnica de Valencia, Camino de Vera s/n, 46020 Valencia, Spain.


We propose the use of an actively mode-locked fiber laser as a multitap optical source for a microwave photonic filter. The fiber laser provides multiple optical taps with an optical frequency separation equal to the external driving radio-frequency signal of the laser that governs its repetition rate. All the optical taps show equal polarization and an overall Gaussian apodization, which reduces the sidelobes. We demonstrate continuous tunability of the filter by changing the external driving radio-frequency signal of the laser, which shows good fine tunability in the operating range of the laser from 5 to 10 GHz.

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