7 May 2015 Highly tunable microwave and millimeter wave filtering using photonic technology
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Optical Engineering, 54(5), 057102 (2015). doi:10.1117/1.OE.54.5.057102
The design for a photonic microwave filter tunable in both bandwidth and operating frequency is proposed and experimentally demonstrated. The circuit is based on a single sideband modulator used in conjunction with two or more transmission fiber Bragg gratings (FBGs) cascaded in series. It is demonstrated that the optical filtering characteristics of the FBGs are instrumental in defining the shape of the microwave filter, and the numerical modeling was used to optimize these characteristics. A multiphase-shift transmission FBG design is used to increase the dynamic range of the filter, control the filter ripple, and maximize the slope of the filter skirts. Initial measurements confirmed the design theory and demonstrated a working microwave filter with a bandwidth tunable from approximately 2 to 3.5 GHz and an 18 GHz operating frequency tuning range. Further work is required to refine the FBG manufacturing process and reduce the impact of fabrication errors.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Joseph S. Seregelyi, Ping Lu, Stéphane Paquet, Dritan Celo, Stephen J. Mihailov, "Highly tunable microwave and millimeter wave filtering using photonic technology," Optical Engineering 54(5), 057102 (7 May 2015). https://doi.org/10.1117/1.OE.54.5.057102

Fiber Bragg gratings

Optical filters

Microwave radiation

Tunable filters

Electronic filtering

Signal attenuation

Extremely high frequency

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