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Microwave Photonic Filters Reconfigured Without an External Device

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LAUSANNE, Switzerland, Sept. 14, 2020 — Researchers from École Polytechnique Fédérale de Lausanne (EPFL) have developed a method of reconfiguring microwave photonic filters without the need for an external device. The research may enable more compact, environmentally friendly filters at lower cost. Potential applications include those involving detection and communication systems. By establishing interference between two pulses within a microcomb, the researchers were able to accurately control the pulses in order to reconfigure the outgoing radio frequency. The effort generated different types of...Read full article

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    Published: September 2020
    Glossary
    microwave
    An electromagnetic wave lying within the region of the frequency spectrum that is between about 1000 MHz (1 GHz) and 100,000 MHz (100 GHz). This is equivalent to the wavelength spectrum that is between one millimeter and one meter, and is also referred to as the infrared and short wave spectrum.
    microcomb
    A microcomb, short for microresonator frequency comb, is a novel photonic device that generates a precise series of evenly spaced optical frequencies, akin to the teeth of a comb, across a broad spectrum of wavelengths. It operates based on the phenomenon of Kerr frequency comb generation, which occurs in certain nonlinear optical resonators. Microcombs are typically fabricated from high-quality optical materials, such as silicon nitride or silicon dioxide, and have dimensions on the order of...
    light source
    The generic term applied to all sources of visible radiation from burning matter to ionized vapors and lasers, regardless of the degree of excitation.
    terahertz
    Terahertz (THz) refers to a unit of frequency in the electromagnetic spectrum, denoting waves with frequencies between 0.1 and 10 terahertz. One terahertz is equivalent to one trillion hertz, or cycles per second. The terahertz frequency range falls between the microwave and infrared regions of the electromagnetic spectrum. Key points about terahertz include: Frequency range: The terahertz range spans from approximately 0.1 terahertz (100 gigahertz) to 10 terahertz. This corresponds to...
    chip
    1. A localized fracture at the end of a cleaved optical fiber or on a glass surface. 2. An integrated circuit.
    Research & TechnologyEPFLEPFL Lausanneradio-frequency photonic filtermicrowavemicrocomblight source5Gterahertzsilicon nitrideLight SourcesEuropeSwitzerlandeducationchipnitrideFilters

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