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Opt Express. 2009 Jul 20;17(15):13216-21.

Tunable photonic microwave notch filter using SOA-based single-longitudinal mode, dual-wavelength laser.

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  • 1Photonics Research Laboratory, Division of Intelligent System, Korea Institute of Science and Technology, Seoul 130-791, Republic of Korea.


A novel photonic microwave notch filter with capability of frequency tuning is proposed and experimentally demonstrated. The scheme is based on a fiber Bragg grating (FBG)-based, single longitudinal mode, wavelength-spacing tunable dual-wavelength fiber laser and a dispersive fiber delay line. By using a symmetrical S-bending technique along the FBGs, the wavelength spacing of the laser can be tuned, which enables the microwave notch frequency tuning. Experimental results show that the notch rejection of more than 30 dB and the flexible tunability of notch frequency can be readily achieved in the range of 1.2 approximately 6.7 GHz.

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