Ultra-compact lithium niobate microcavity electro-optic modulator beyond 110 GHz

Pan, Bingcheng; Liu, Hongxuan; Xu, Haochen; Huang, Yishu; Li, Huan; Yu, Zejie; Liu, Liu; Shi, Yaocheng; Dai, Daoxin

doi:10.1016/j.chip.2022.100029

Cited by 29 publications

(11 citation statements)

References 44 publications

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“…These advantages allow LNOI to support a wide range of passive and active devices, as illustrated in Figure b. By taking advantages of the high electric-optic coefficient, on-chip modulators achieve a modulation frequency of 110 GHz, , far ahead of the counterparts based on other platforms. Also, with an employment of the strong nonlinearity, optical switching can be performed within an ultrashort time of ∼76 fs (Figure c) .…”

Section: Integrated Photonic Platformmentioning

confidence: 99%

Integrated Photonic Computing beyond the von Neumann Architecture

Jin

2023

ACS Photonics

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In the context of a doomed end of the Moore's law, various new types of computing architectures have been emerging, aiming to meet the demands of intractable computation and artificial intelligence. Photonic computing is a competitive candidate, in light of the inherent properties of photons, including high propagation speed, strong robustness, and multiple degrees of freedom to encode information. Also, the progress of integrated photonics continues to provide novel possibilities, apart from boosting the scalability and stability of photonic computing architectures. Moreover, an introduction of quantum technology might open a new chapter for photonic computing, from the view of single photons. In this Perspective, we highlight the unique features and advances of integrated photonic platforms, whose roles in constructing a non-von Neumann computing architecture are also outlined. We show their potential in solving problems beyond the reach of traditional computers and in machine learning and further discuss the conceivable challenges and opportunities.

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Section: Integrated Photonic Platformmentioning

confidence: 99%

Integrated Photonic Computing beyond the von Neumann Architecture

Jin

2023

ACS Photonics

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“…LN microring or racetrack modulators can support large bandwidths 10,11 , but the bending radius and device size are still large and limited by the anisotropy of the LN thin lm. Recently, substantial progress has been made in LN modulators based on Fabry-Perot (FP) cavities 12 and photonic crystal nanobeams 5 . Unfortunately, the length of the FP-cavity-based modulator is as long as 500 µm, while the bandwidth of the nanobeambased modulator is limited to 17.5 GHz.…”

Section: Introductionmentioning

confidence: 99%

High-speed electro-optic modulation in topological interface states of a one-dimensional lattice

Zhang

Shen

et al. 2023

Preprint

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Electro-optic modulators are key components in data communication, microwave photonics, and quantum photonics. Modulation bandwidth, energy efficiency, and device dimension are crucial metrics of modulators. Here, we provide an important direction for the miniaturization of electro-optic modulators by reporting on ultracompact topological modulators. A topological interface state in a one-dimensional lattice is implemented on a thin film lithium niobate integrated platform. Due to the strong optical confinement of the interface state and the peaking enhancement of the electro-optic response, a topological cavity with a size of 1.6 × 140 µm2 enables a large modulation bandwidth of 104 GHz. The first topological modulator exhibits the most compact device size compared to reported LN modulators with bandwidths above 28 GHz, to the best of our knowledge. 100 Gb/s non-return-to-zero and 100 Gb/s four-level pulse amplitude modulation signals are generated. The switching energy is 5.4 fJ/bit, owing to the small electro-optic mode volume and low capacitance. The topological modulator accelerates the response time of topological photonic devices from the microsecond order to the picosecond order and provides an essential foundation for the implementation of large-scale lithium niobate photonic integrated circuits.

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“…In recent years, thin-film lithium niobate (LN) on insulator (LNOI) is emerging as a promising integrated photonic platform for on-chip scalable optical signal manipulation and processing that provides large refractive index contrast, strong electro-optic (EO), thermo-optic (TO), and nonlinear effects across a wide transparency window. [1][2][3][4][5][6][7][8][9] Currently, a series of high-performance integrated devices on LNOI, based on Mach-Zehnder interferometers (MZIs), [10] microring [11] and racetrack resonators, and photonic crystal structures, have been reported for applications in modulators, [12][13][14][15][16][17][18][19] filters, [20][21][22] polarization controllers, [23] and frequency combs. [24][25][26][27][28] While EO phase shifters are indispensable for highspeed applications, they often suffer from stability issues for low-speed and static applications, such as modulator bias control and photonic switches.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Thermo‐Optic Mach–Zehnder Interferometer on LNOI for Polarization Handling and Multiplexing

Song

Liu

et al. 2023

Laser & Photonics Reviews

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Thin‐film lithium niobate (LN) on insulator (LNOI) is emerging as a promising integrated photonic platform. Thermo‐optic (TO) Mach–Zehnder interferometers (MZIs) on LNOI are demonstrated to be a viable and often preferred alternative to their electro‐optic counterparts for low‐speed and static applications, where stability and repeatability are crucial. Harnessing the unique and strong anisotropic TO effect of LN, a novel and versatile anisotropic TO MZI on x‐cut LNOI for polarization handling and multiplexing is proposed and experimentally implemented. Each MZI arm consists of a two‐section anisotropic TO phase shifter along the y‐ and z‐directions of the LN crystal, leading to anisotropic temperature dependence of the effective refractive indices for the transverse‐electric (TE) and transverse‐magnetic (TM) polarizations. A polarization‐insensitive switch and a polarization beam splitter are implemented with the MZI device, which features low excess loss of ≈0.2–1.8 dB and a high extinction ratio of ≈20–45 dB in the telecom C‐band (1530–1565 nm). More intriguingly, arbitrary splitting ratios and even arbitrary combinations of unitary transmission matrices can be further implemented for both polarizations simultaneously. The versatile configurations of this anisotropic TO MZI have important implications for large‐scale photonic computing and interconnect.

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Ultra-compact lithium niobate microcavity electro-optic modulator beyond 110 GHz

Cited by 29 publications

References 44 publications

Integrated Photonic Computing beyond the von Neumann Architecture

Integrated Photonic Computing beyond the von Neumann Architecture

High-speed electro-optic modulation in topological interface states of a one-dimensional lattice

Anisotropic Thermo‐Optic Mach–Zehnder Interferometer on LNOI for Polarization Handling and Multiplexing

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