![]() Isolation using magneto-optic materials has been difficult to integrate into complementary metal–oxide–semiconductor (CMOS) fabrication platforms, motivating the use of other paths to effective non-reciprocity such as temporal modulation. Optical isolators, while commonplace in bulk and fiber optical systems, remain a key missing component in integrated photonics. The integrable isolator, operating in the telecommunication band, is characterized by a perfectly linear output versus input power dependence and can be incorporated into high-speed telecom and datacom systems as well as a variety of other applications. We also discuss pathways for substantial isolation improvement using appropriate anti-reflection coatings. The difference of transmittance at the signal wavelength between forward and backward propagation is 40 dB. We demonstrate a wide bandwidth of more than 150 nm, limited only by the measurement setup, and an optical isolation ratio of up to 18 dB for the involved idler and signal waves. The scheme is experimentally demonstrated using difference-frequency generation in periodically poled thin-film lithium niobate integrated devices and short- and long-pass optical filters. We introduce a new class of wideband nonmagnetic and linear optical isolators based on nonlinear frequency conversion and spectral filtering among the pump, signal, and idler wavelengths. Optical isolators, reliably integrated on-chip, are crucial components for a wide range of optical systems and applications. Our device’s dual-band isolation, high flexibility, and real-time tunability can enable novel non-reciprocal functionality on integrated photonic platforms. Isolation bandwidths up to ∼100 nm can be achieved simultaneously at both visible and telecom wavelengths, limited only by the modulation bandwidth. In addition, we experimentally show that this isolator can simultaneously operate at visible and telecom wavelengths with comparable performance. We measure an isolation ratio of 15 dB and insertion loss below 0.5 dB for a continuous wave laser input at 1550 nm. We use dynamic standing-wave modulation in a tandem configuration to break Lorentz reciprocity and achieve isolation. Here, we demonstrate a wideband integrated optical isolator in thin-film lithium niobate photonics. Current integrated optical isolators have limited bandwidths due to stringent phase-matching conditions, resonant structures, or material absorption. Optical isolators are an essential component of photonic systems.
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