Integrated Passive Nonlinear Optical Isolators

White, Alexander D.; Ahn, Geun Ho; Gasse, Kasper Van; Yang, Ki Youl; Lin, Chong; Bowers, John E.; Vučković, Jelena

doi:10.48550/arxiv.2206.01173

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…The difference of SFM and XFM in Kerr-type nonlinear material has been exploited to demonstrate optical isolators and circulators, but only for very different opposite input powers. [58,84] In the work, [58] the backward light is 3.3 dB and 5 dB lower than the forward signal. In applications of optical sensors, [5,51,[70][71][72] the backward signal has a power very close to the forward one.…”

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confidence: 84%

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Dynamic Nonreciprocity with a Kerr Nonlinear Resonator

Rui-Kai¹,

Tang²,

Xia³

et al. 2022

Chinese Phys. Lett.

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On-chip optical nonreciprocal devices are vital components for integrated photonic systems and scalable quantum information processing. Nonlinear optical isolators and circulators have attracted considerable attention because of their fundamental interest and their important advantages in integrated photonic circuits. However, optical nonreciprocal devices based on Kerr or Kerr-like nonlinearity are subject to dynamical reciprocity when the forward and backward signals coexist simultaneously in a nonlinear system. Here, we theoretically propose a method for realizing on-chip nonlinear isolators and circulators with dynamic nonreciprocity. Dynamic nonreciprocity is achieved via the chiral modulation on the resonance frequency due to coexisting self- and cross-Kerr nonlinearities in an optical ring resonator. This work showing dynamic nonreciprocity with a Kerr nonlinear resonator can be an essential step toward integrated optical isolation.

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confidence: 84%

“…Note that an experiment [58] has demonstrated a passive nonlinear optical isolator by exploiting the different SKM and XKM. Very recently, another experimental group [84] has also achieved optical nonreciprocity on a chip with the same idea. However, these two works use different configurations with very different opposite input powers.…”

mentioning

confidence: 99%

Dynamic Nonreciprocity with a Kerr Nonlinear Resonator

Rui-Kai¹,

Tang²,

Xia³

et al. 2022

Chinese Phys. Lett.

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“…Another method for achieving non-reciprocity is through the nonlinear effects, such as Kerr nonlinearity [7]- [12]. It has been demonstrated in different platforms such as fused silica microrod resonator [7], nonlinear silicon Mach-Zehnder interferometer [8], onchip silicon nitride ring resonator [9] and silicon ring resonator [10]. Unfortunately this method only works with high-intensity input power, which is not compatible for all of the practical applications, and is accompanied by considerable unwanted harmonics.…”

Section: Introductionmentioning

confidence: 99%

Design Guidelines for a Tunable SOI Based Optical Isolator in a Partially Time-Modulated Ring Resonator

Zarif¹,

Mehrany

Memarian

et al. 2022

IEEE Photonics J.

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In this paper, we present the design guidelines for a tunable optical isolator in an SOI-based ring resonator with two small time-modulated regions. By considering a physical model, the proper geometrical and modulation parameters are designed, based on a standard CMOS foundry process. The effect of the variation of the key parameters on the performance of the isolator is explained by two counter-acting mechanisms, namely the separation between the resonance frequencies of counterrotating modes and energy transfer to the side harmonic. We show that there is a trade-off between these parameters to obtain maximum isolation. Consequently, by applying the quadrature phase difference one can obtain the maximum separation between the resonance frequencies and hence the minimum insertion loss, while the maximum isolation is obtained at the modulation phase difference of −0.78π, which leads to a higher insertion loss. Robustness of the design is investigated through a sensitivity analysis for the fabrication variations in the distance and width of the modulated regions. We demonstrate that there is a tradeoff between isolation and insertion loss, and by varying the modulation parameters, we can achieve isolation of 18 (5) dB with 7 (1.8) dB insertion loss.

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Visible-telecom tunable dual-band optical isolator based on dynamic modulation in thin-film lithium niobate

et al. 2023

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Optical isolators are an essential component of photonic systems. Current integrated optical isolators have limited bandwidths due to stringent phase-matching conditions, resonant structures, or material absorption. Here, we demonstrate a wideband integrated optical isolator in thin-film lithium niobate photonics. We use dynamic standing-wave modulation in a tandem configuration to break Lorentz reciprocity and achieve isolation. We measure an isolation ratio of 15 dB and insertion loss below 0.5 dB for a continuous wave laser input at 1550 nm. In addition, we experimentally show that this isolator can simultaneously operate at visible and telecom wavelengths with comparable performance. Isolation bandwidths up to ∼100 nm can be achieved simultaneously at both visible and telecom wavelengths, limited only by the modulation bandwidth. Our device’s dual-band isolation, high flexibility, and real-time tunability can enable novel non-reciprocal functionality on integrated photonic platforms.

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Integrated Passive Nonlinear Optical Isolators

Cited by 3 publications

References 38 publications

Dynamic Nonreciprocity with a Kerr Nonlinear Resonator

Dynamic Nonreciprocity with a Kerr Nonlinear Resonator

Design Guidelines for a Tunable SOI Based Optical Isolator in a Partially Time-Modulated Ring Resonator

Visible-telecom tunable dual-band optical isolator based on dynamic modulation in thin-film lithium niobate

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