Extremely high extinction ratio electro-optic modulator via frequency upconversion to visible wavelengths

• DOI: 10.1364/ol.525733
• Publication Date: 2024-06-18T12:01:31Z
• Authors: Alessandra Sabatti; Jost Kellner; Fabian Kaufmann; Robert J. Chapman; Giovanni Finco; Tristan Kuttner; Andreas Maeder; Rachel Grange
• Keywords: Extinction ratio; Photon Upconversion; SIGNAL (programming language); Electro-optic modulator

Intensity modulators are fundamental components for integrated photonics. From near-infrared (NIR) to visible spectral ranges, they find applications in optical communication and quantum technologies. In particular, required the control manipulation of atomic systems such as clocks computers. Typical electro-optic operating at these wavelengths show high bandwidth low-voltage operation, but their extinction ratios moderate. Here we present an thin-film lithium niobate (EO) modulator C-band, which uses a subsequent periodically poled waveguide convert modulated signal from 1536 768 nm using second-harmonic (SH) generation. We demonstrate that upconverted retains characteristics input signal, reaching measured 35 GHz. Due nature nonlinear process, it exhibits, with respect doubled ratio 46 dB, is highest, best our knowledge, recorded light on this platform.