Photonics Research, Volume. 10, Issue 7, 1723(2022)
Surface acoustic wave photonic filters with a single narrow radio-frequency passband in standard silicon on insulator Editors' Pick
Fig. 1. (a) Schematic illustration of a SAW-photonic, discrete-time microwave filter device in SOI. An optical beam (red) from input fiber 1, modulated by microwave-frequency information, illuminates a grating of metallic stripes (yellow). Thermoelastic expansion and contraction of the grating elements lead to the launch of SAWs, which pass across a resonator waveguide layout. Generation of SAWs is the most effective when the grating period and modulation frequency match those of a surface acoustic mode. Continuous-wave light from input fiber 2 is coupled into the resonator waveguide. The propagating SAWs imprint a replica of the input information onto the guided optical wave in each of
Fig. 2. (a)–(c) Top-view optical microscope images of a 16-tap SAW-photonic MWP filter device. Scale bars correspond to 200 μm, 100 μm, and 50 μm in the three panels, respectively. A square grating of gold stripes is deposited to the right of a long resonator waveguide. The resonator layout consists of 16 straight sections that run parallel to the grating stripes. (d), (e) Top-view optical microscope images of a 32-tap SAW-photonic MWP filter device. Scale bars correspond to 400 μm and 100 μm, respectively. A grating coupler for optical input can be seen at the end of a bus waveguide in the lower left corner of panel (d). A two-tap device to the right of the metallic grating is seen in panel (e).
Fig. 3. (a) Measured normalized transfer function of optical power through the resonator waveguide of a 32-tap, SAW-photonic microwave filter device. The free spectral range of the transfer function is 55 pm, and its extinction ratio is 15 dB. (b) Experimental setup used in the measurement of MWP filter device transfer functions. EDFA, erbium-doped fiber amplifier; PC, polarization controller; EOM, electro-optic amplitude modulator; CW, continuous-wave. (c) Solid red, measured normalized transfer function
Fig. 4. (a) Solid red, measured normalized transfer function
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Moshe Katzman, Maayan Priel, Inbar Shafir, Saawan Kumar Bag, Dvir Munk, Naor Inbar, Moshe Feldberg, Tali Sharabani, Leroy Dokhanian, Matan Slook, Avi Zadok. Surface acoustic wave photonic filters with a single narrow radio-frequency passband in standard silicon on insulator[J]. Photonics Research, 2022, 10(7): 1723
Category: Silicon Photonics
Received: Mar. 1, 2022
Accepted: May. 3, 2022
Published Online: Jun. 30, 2022
The Author Email: Avi Zadok (Avinoam.Zadok@biu.ac.il)