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Acoustically driven arrayed waveguide grating.

A Crespo-Poveda, A Hernández-Mínguez, B Gargallo

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    We developed tunable wavelength-division multiplexers using surface acoustic waves (SAWs) to control optical signals in waveguides. These devices offer a novel method for manipulating multiple light wavelengths efficiently.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science (AlGaAs)

    Background:

    • Wavelength-division multiplexing (WDM) is crucial for optical communication.
    • Tunable and compact WDM devices are highly sought after for advanced optical systems.
    • Surface acoustic waves (SAWs) offer a promising method for dynamic optical control.

    Purpose of the Study:

    • To demonstrate compact, tunable phased-array wavelength-division multiplexers.
    • To investigate SAW-driven modulation of optical signals in integrated waveguide arrays.
    • To present and compare two distinct device layouts for SAW-based WDM.

    Main Methods:

    • Monolithic fabrication of devices on (Al,Ga)As substrates.
    • Integration of two coupler types: multi-mode interference (MMI) couplers and free-propagating regions.
    • Application of a standing surface acoustic wave (SAW) to modulate the refractive index of an arrayed waveguide (WG) structure.

    Main Results:

    • Demonstration of tunable WDM operation across five wavelength channels with 2 nm separation.
    • Observation of periodic path switching of wavelength components between adjacent output channels.
    • Achieved good agreement between theoretical predictions and experimental results for SAW-driven WDM.

    Conclusions:

    • Compact, tunable phased-array WDM devices driven by low GHz SAWs are feasible.
    • SAW-induced refractive index modulation effectively controls optical signal routing.
    • The demonstrated devices show potential for advanced optical signal processing applications.