Recent development in integrated Lithium niobate photonics

Advances in Physics X, Journal Year: 2024, Volume and Issue: 9(1)

Published: March 12, 2024

The lithium niobate on insulator devices confine the light field to submicron size in monocrystalline niobate, achieve ultra-strong electro-optical interaction and nonlinear optical interaction, thus extend frontiers of photonic research past decade. Such are manufactured using nano-fabrication technology over thin-film wafer, which usually stands a silica layer above substrate material, including low-loss waveguides, modulators, domain engineered structures, high-Q microring resonators electrical filters etc., lead breakthroughs communication, microwave photonics quantum integration.

Language: Английский

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Electro‐Optic Frequency Combs: Theory, Characteristics, and Applications

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(6)

Published: April 10, 2023

Abstract Optical frequency combs (OFCs) are a unique kind of light source, which represented as series equally spaced coherent spectral lines in the domain. OFCs can mainly be divided into mode‐locked lasers, Kerr combs, and electro‐optic (E‐O combs), have broad applications optical communications, metrology, atomic clocks, distance ranging, spectroscopy, arbitrary waveform generation. Among them, E‐O feature some advantages, such fast tunable repetition rate, high sidebands power, reconfigurability comb spectrum. Especially recent years, with development micro–nano processing technology, on‐chip become dynamic research topic many fundamental scientific problems well engineering for further exploration. To summarize past envision prosperous future area is reviewed from following aspects: combs; theory including generation process modulation models; important techniques flattening, broadening, noise, stability controlling; wavelength calibration astronomical spectrographs, microwave generation; pros cons when compared other OFCs.

Language: Английский

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Soliton microcomb generation by cavity polygon modes

Opto-Electronic Advances, Journal Year: 2024, Volume and Issue: 7(8), P. 240061 - 240061

Published: Jan. 1, 2024

Soliton microcombs, which require the hosting cavity to operate in an anomalous dispersion regime, are essential integrate photonic systems. In past, soliton microcombs were generated on whispering gallery modes (WGMs), and requirement of made by normal material was achieved through structural engineering. This inevitably degrades optical quality factor (Q) increases pump threshold power for comb generation. To overcome challenges, here, we report a microcomb excited polygon modes. These display at near-infrared while Q factors exceeding 4×106 maintained. Consequently, spanning from 1450 nm 1620 with record low 11 mW is demonstrated, three-fold improvement compared state art same platform.

Language: Английский

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Lithium niobate on insulator – fundamental opto-electronic properties and photonic device prospects

Nanophotonics, Journal Year: 2024, Volume and Issue: 13(17), P. 3037 - 3057

Published: May 28, 2024

Lithium niobate on insulator (LNOI) combines a variety of optoelectronic properties and can meet practical performance requirements that are uncommon in materials. This review introduces the fundamentals photonic device concepts arise from LNOI materials platform. Firstly, nonlinear optical response is presented, including birefringent phase matching (BPM), modal (MPM), quasi-phase (QPM). The tunable also introduced, electro-optical (EO), thermo-optical (TO), acousto-optical (AO) effects. structures devices, such as ridge waveguides (including periodically polarized inversion waveguides), Mach-Zehnder interferometer (MZI) modulators micro-resonators (such disks rings) demonstrated. Finally, future devices discussed. In already mature developed material systems, it rare to find one particular system supporting so many basic components, does field integrated chips.

Language: Английский

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Monolithically Integrated Active Passive Waveguide Array Fabricated on Thin Film Lithium Niobate Using a Single Continuous Photolithography Process

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(4)

Published: Jan. 22, 2023

Abstract This work demonstrates a robust low‐loss optical interface by tiling passive (i.e., without doping of active ions) thin film lithium niobate (TFLN) and doped with rare earth TFLN substrates for monolithic integration passive/active photonics. The tiled composed both areas allow patterning the mask integrated photonic device at once using single continuous photolithography process. loss substrate is measured as low 0.26 dB. Thanks to stability provided this approach, four‐channel waveguide amplifier realized in straightforward manner, which shows net gain 5 dB 1550‐nm wavelength 8 1530‐nm each channel. will facilitate large‐scale high performance devices that require on‐chip light sources amplifiers.

Language: Английский

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Electro‐Optically Tunable Low Phase‐Noise Microwave Synthesizer in an Active Lithium Niobate Microdisk

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(5)

Published: Feb. 3, 2023

Abstract Photonic‐based low‐phase‐noise microwave generation with real‐time frequency tuning is crucial for a broad spectrum of subjects, including next‐generation wireless communications, radar, metrology, and modern instrumentation. Here, the first time to best authors’ knowledge, narrow‐bandwidth dual‐wavelength microlasers are generated from nearly‐degenerate polygon modes in high‐Q active lithium niobate microdisk. The record‐high‐Q (≈10 7 ) formation independently controllable resonant wavelengths free spectral ranges enabled by weak perturbation microdisks using tapered fiber. Moreover, because high spatial overlap factor between pump laser achieved, gain competition two lasing spatially separated π‐phase difference suppressed, leading stable low threshold, turn, noise source. beating signal confirms phase‐noise achieved tunable laser. Without need external phase stabilizers, measured shows −123 dBc Hz −1 an electro‐optic efficiency −1.66 MHz V . linewidth as 6.87 kHz, which more than three orders magnitude narrower current records based on integrated dual‐lasers.

Language: Английский

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Electro-optically tunable optical delay line with a continuous tuning range of ∼220 fs in thin-film lithium niobate

Optics Letters, Journal Year: 2023, Volume and Issue: 48(9), P. 2261 - 2261

Published: March 23, 2023

We demonstrate fabrication of a 30-cm-long thin-film lithium niobate (TFLN) optical delay line (ODL) incorporated with segmented microelectrodes 24-cm total length using the femtosecond laser lithography technique. The transmission spectra unbalanced Mach-Zehnder interferometers (MZIs) reveal an ultra-low propagation loss 0.025 dB/cm. device exhibits low half-wave voltage 0.45 V, corresponding to voltage-length product 10.8 V·cm, which is equivalent 5.4 V·cm in push-pull configuration. also high electro-optic (EO) tuning efficiency 3.146 fs/V and continuous range 220 fs fabricated ODL.

Language: Английский

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Erbium-ytterbium codoped thin-film lithium niobate integrated waveguide amplifier with a 27 dB internal net gain

Optics Letters, Journal Year: 2023, Volume and Issue: 48(16), P. 4344 - 4344

Published: July 18, 2023

A photonic integrated waveguide amplifier fabricated on erbium-ytterbium (Er-Yb) codoped thin-film lithium niobate (TFLN) has been investigated in this work. small-signal internal net gain of 27 dB is achieved at a signal wavelength 1532 nm the Er-Yb TFLN pumped by diode laser ≈980 nm. Experimental characterizations reveal suitability fabrication photolithography-assisted chemo-mechanical etching (PLACE) technique and also an Yb-sensitized-Er material. The demonstrated high-gain chip-scale promising for interfacing with established devices, greatly extending spectrum applications.

Language: Английский

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A Review on Reconfigurable Metalenses Revolutionizing Flat Optics

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(14)

Published: Dec. 31, 2023

Abstract Metalenses (MLs), representing a groundbreaking paradigm shift within the realm of optics, have ushered in transformative era ability to manipulate and harness power light. Diverging from conventional approach reliant on curved surfaces bend light, MLs intricate arrays minuscule nanostructures exert precise control over phase amplitude incident light waves. This revolutionary technology bestows plethora advantages, including creation ultra‐compact optical systems, enhancement focusing capabilities unprecedented levels, capability rectify aberrations significantly thinner more lightweight form factor. discovered multitude applications spanning diverse fields, imaging photography augmenting reality refining medical devices. They stand as beacon hope for reshaping landscape courtesy their remarkable adaptability exceptional performance. As evolution forges ahead, they hold immense potential transcend boundaries what can be accomplished domain light‐based technologies. review presents recent advances reconfigurable applicability systems.

Language: Английский

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High‐Performance Integrated Laser Based on Thin‐Film Lithium Niobate Photonics for Coherent Ranging

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(10)

Published: May 16, 2024

Abstract Frequency‐modulated continuous‐wave (FMCW) light detection and ranging (LiDAR) has a huge potential for developing the next generation of LiDAR applied in autonomous driving, industrial automation, environmental monitoring, so on. An ideal laser FMCW system should simultaneously feature fast chirp repetition frequency, large bandwidth, high linearity, compact footprint, low‐cost. In this study, such based on thin‐film lithium niobate (TFLN) photonics is proposed demonstrated. The can achieve bandwidth 3.44 GHz, tuning efficiency 574 MHz V −1 , rate × 10 7 GHz s which are best values compared with other TFLN‐based lasers. A built by their also experimentally demonstrated, showing that it precision 4.9 mm, velocity 0.054 m sampling 5 MSa .

Language: Английский

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