Bragg gratings in thin-film LiNbO_3 waveguides

Baghban, Mohammad Amin; Schollhammer, Jean; Errando-Herranz, Carlos; Gylfason, Kristinn B.; Gallo, Katia

doi:10.1364/oe.25.032323

Cited by 62 publications

(19 citation statements)

References 30 publications

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“…There have been a number of reports on LNOI grating couplers [121,[129][130][131][132][133][134], with a current record coupling efficiency as low as -3.5 dB per coupler [121] (see Figure 8(b)). Two unique problems of LNOI grating couplers are: (1) the anisotropy of LN causes orientation-dependent coupling, (2) nonvertical sidewall angle in dry etching limits minimum pitch size and fill-factor of the gratings.…”

Section: Fiber-to-chip Couplingmentioning

confidence: 99%

Integrated photonics on thin-film lithium niobate

et al. 2021

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Lithium niobate (LN), an outstanding and versatile material, has influenced our daily life for decades: from enabling high-speed optical communications that form the backbone of the Internet to realizing radio-frequency filtering used in our cell phones. This half-century-old material is currently embracing a revolution in thin-film LN integrated photonics. The success of manufacturing wafer-scale, high-quality, thin films of LN on insulator (LNOI), accompanied with breakthroughs in nanofabrication techniques, have made high-performance integrated nanophotonic components possible. With rapid development in the past few years, some of these thin-film LN devices, such as optical modulators and nonlinear wavelength converters, have already outperformed their legacy counterparts realized in bulk LN crystals. Furthermore, the nanophotonic integration enabled ultra-low-loss resonators in LN, which unlocked many novel applications such as optical frequency combs and quantum transducers. In this Review, we cover-from basic principles to the state of the art-the diverse aspects of integrated thinfilm LN photonics, including the materials, basic passive components, and various active devices based on electro-optics, all-optical nonlinearities, and acousto-optics. We also identify challenges that this platform is currently facing and point out future opportunities. The field of integrated LNOI photonics is advancing rapidly and poised to make critical impacts on a broad range of applications in communication, signal processing, and quantum information.

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Section: Fiber-to-chip Couplingmentioning

confidence: 99%

Integrated photonics on thin-film lithium niobate

et al. 2021

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“…WBGs are the integrated photonics counterparts of the well-known fiber Bragg gratings with applications in wavelength division multiplexing and photonic signal processing [15], [16]. In LNOI, integrated waveguide gratings as well as the linear electro-optic shift of the transmission spectrum have been previously demonstrated [17], [18]. EOMs based on WBGs have small footprints in the order of × 400 µm 2 and offer the possibility for high level parallelization on a single chip while the electro-optic bandwidth is not cavity-photon lifetime limited.…”

Section: Introductionmentioning

confidence: 99%

100-GBd Waveguide Bragg Grating Modulator in Thin-Film Lithium Niobate

Pohl

Messner

Kaufmann

et al. 2021

IEEE Photon. Technol. Lett.

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“…2(a) exhibits a narrow transparent window residing between two broader dips analogous to an EIT spectrum. The intrinsic loss of LN waveguide at a wavelength of 1550 nm is about 3 dB/cm [21]. Apart from the other loss mechanisms, with only the intrinsic loss considered, the transmission peak drops from 0 to −0.012 dB.…”

Section: Simulations and Analysismentioning

confidence: 99%

“…Design and fabrication of optical elements or devices based on LNOI platform have greatly developed in the past few years. In [21], a sidewall corrugated Bragg grating in LNOI platform was designed, fabricated and characterized. The extinction ratio of the LN Bragg grating was demonstrated as high as 27 dB and the rejection bandwidth is 3 nm.…”

Section: Introductionmentioning

confidence: 99%

Tunable Electromagnetically Induced Transparency-Like Spectrum in Lithium Niobate on Insulator Platform With Narrow Linewidth

Dai

Zhao

et al. 2020

IEEE Photonics J.

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An all-pass racetrack-resonator-Bragg gratings (APRR-BG) on thin-film lithium niobate on insulator (LNOI) based coupling resonant system is proposed to generate tunable electromagnetically induced transparency (EIT)-like transmission. The structure is a normal all-pass racetrack-resonator with two Bragg gratings inscribed within the straight waveguides, which introduces two different optical pathways in essence, inducing EIT-like spectrum as a result. We investigate the linewidth and tunability of the EIT-like spectrum and manufacturing tolerance of the resonant system by utilising the transfer matrix method. The simulation results indicate an extremely narrow linewidth of several picometers and a high voltage sensitivity of 0.338 GHz/V @1550nm, which indicates potential for optical filter, optical switching and sensing of the system.

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Bragg gratings in thin-film LiNbO_3 waveguides

Cited by 62 publications

References 30 publications

Integrated photonics on thin-film lithium niobate

Integrated photonics on thin-film lithium niobate

100-GBd Waveguide Bragg Grating Modulator in Thin-Film Lithium Niobate

Tunable Electromagnetically Induced Transparency-Like Spectrum in Lithium Niobate on Insulator Platform With Narrow Linewidth

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