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Optical Engineering

Highly tunable microwave and millimeter wave filtering using photonic technology
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Paper Abstract

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.

Paper Details

Date Published: 7 May 2015
PDF: 9 pages
Opt. Eng. 54(5) 057102 doi: 10.1117/1.OE.54.5.057102
Published in: Optical Engineering Volume 54, Issue 5
Show Author Affiliations
Joseph S. Seregelyi, Health Canada (Canada)
Ping Lu, National Research Council Canada (Canada)
Stéphane Paquet, TeraXion Inc. (Canada)
Dritan Celo, Huawei Technologies Co., Ltd. (Canada)
Stephen J. Mihailov, National Research Council Canada (Canada)

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