High, Resolution Tunable Microwave Filter Using Hybrid Analog-Digital Controls via an Acoustooptic Tunable Filter and Digital Micromirror Device

    Authors

    N. A. Riza;F. N. Ghauri

    Comments

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    Abbreviated Journal Title

    J. Lightwave Technol.

    Keywords

    Microwave filters; radar; signal procesor; RADIOFREQUENCY TRANSVERSAL FILTER; GRATINGS; SIGNALS; Engineering, Electrical & Electronic; Optics; Telecommunications

    Abstract

    A programmable broadband Radio Frequency (RF) filter is designed using a Digital Micromirror Device (DMD), an Acoustooptic Tunable Filter (AOTF), and a Chirped Fiber Bragg grating (CFBG). This hybrid analog-digital optical design enables implementation of RF filters with higher number of taps in comparison with an AOTF-only RF filter design and improved RF tunability in comparison with a DMD-only design. A 3-tap RF filter is theoretically analyzed and experimentally demonstrated using a combination of analog and digital optical tap selection. Filter nulls recorded at 6.90, 6.945, and 6.99 GHz show the tunability improvement with the hybrid design. Implementation of higher tap count filters can lead to similar improvements in filter tunability and pass-band and stop-band characteristics.

    Journal Title

    Journal of Lightwave Technology

    Volume

    26

    Issue/Number

    17-20

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    3056

    Last Page

    3061

    WOS Identifier

    WOS:000262657200008

    ISSN

    0733-8724

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