A notch filter acoustically induced in a 1-cm-long chirped fiber Bragg grating is experimentally investigated. The notch reflectivity (-5.8 to -32 dB) and the bandwidth (2.2 to 1.3 nm) are tuned by an electrical signal. The reduction of the modulator size and the grating length, compared with previous works with acousto-optic modulation, points to more efficient acousto-optic devices in standard single-mode optical fibers.
Silva, R. E., Becker, M., Rothhardt, M., Bartelt, H., & Pohl, A. A. P. (2016). Acousto-Optic Notch Filter Dynamically Induced in a Chirped Fiber Bragg Grating. IEEE Photonics Technology Letters, 28(10), 1081 - 1083. https://doi.org/10.1109/LPT.2016.2529961