Effect of dimension variation for second-harmonic generation in lithium niobate on insulator waveguide [Invited]

Tian, Xiaogeng; Zhou, Wei; Ren, Kun-Qian; Zhang, Chi; Liu, Xiaoyue; Xue, Guang-Tai; Duan, Jia-Chen; Cai, Xinlun; Hu, Xiaopeng; Gong, Yan‐Xiao; Xie, Zhenda; Zhu, Shining

doi:10.3788/col202119.060015

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Besides, the silicon optical modulator, which could be integrated utilizing complementary metal oxide semiconductor (CMOS) techniques, is also a hot research topic [17] . Recently, LN on insulator (LNOI) showing integration potential has drawn much attention, which may be more mature in the near future [18][19][20][21] . Regardless of the techniques or material platforms of the external modulator, physical mechanisms, as well as obtained results, are similar.…”

Section: Discussionmentioning

confidence: 99%

In-band intermodulation induced by transient response of erbium-doped fiber amplifier

Shao

Zhang

et al. 2022

中国光学快报

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Transient response of an erbium-doped fiber amplifier (EDFA) is studied in an externally-modulated analog link. Double tones represented as transmitted radio frequency and dither signals are introduced. Extra modulation is generated owing to the EDFA's transient response caused by a low-frequency dither signal. Therefore, the parasitic modulation is superposed to the output signals and may significantly affect in-band electrical spectra. Analytical and numerical solutions are both given, which agree well with experimental results. This work indicates that a suitable dither signal should be selected to maximize the carrier to intermodulation ratio. In-band spurious free dynamic range is optimized in the meantime.

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Section: Discussionmentioning

confidence: 99%

In-band intermodulation induced by transient response of erbium-doped fiber amplifier

Shao

Zhang

et al. 2022

中国光学快报

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“…33 The lower maximum efficiency is mainly caused by the inhomogeneity of the thin-film thickness over the 5-mm waveguide length. 34,35 We define an overall normalized efficiency by dividing the collected second harmonic power by the square of the input pump light and the square of the poled waveguide length. By taking account of the off-chip coupling efficiency k pump ∼ 80% (1 dB per facet) at 1563.1 nm and k SH ∼ 50% (3 dB per facet) at 781.55 nm, the overall normalized efficiency is counted to be 1027% W −1 cm −2 according to formula of…”

Section: Second Harmonic Generationmentioning

confidence: 99%

Ultra-broadband and low-loss edge coupler for highly efficient second harmonic generation in thin-film lithium niobate

et al. 2022

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Thin-film lithium niobate is a promising material platform for integrated nonlinear photonics, due to its high refractive index contrast with the excellent optical properties. However, the high refractive index contrast and correspondingly small mode field diameter limit the attainable coupling between the waveguide and fiber. In second harmonic generation processes, lack of efficient fiber-chip coupling schemes covering both the fundamental and second harmonic wavelengths has greatly limited the overall efficiency. We design and fabricate an ultra-broadband tri-layer edge coupler with a high coupling efficiency. The coupler allows efficient coupling of 1 dB∕facet at 1550 nm and 3 dB∕facet at 775 nm. This enables us to achieve an ultrahigh overall second harmonic generation normalized efficiency (fiber-to-fiber) of 1027% W −1 cm −2 (on-chip second harmonic efficiency ∼3256% W −1 cm −2 ) in a 5-mm-long periodically-poled lithium niobate waveguide, which is two to three orders of magnitude higher than that in state-of-the-art devices.

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“…To achieve efficient wavelength conversion, the phase matching among interaction waves should be strictly satisfied [21][22][23], which ensures that generated nonlinear optical signals are accumulated constructively. Generally, the current state of the art of phase matching in LN comprises three approaches: birefringent phase matching (BPM) [24][25][26], quasi-phase matching (QPM) [27][28][29], and modal phase matching (MPM) [30][31][32][33][34][35][36]. BPM achieves precise phase matching based on the birefringence effect of LN, under special light propagation direction and polarization configuration.…”

Section: Introductionmentioning

confidence: 99%

Broadband Second Harmonic Generation in a z-Cut Lithium Niobate on Insulator Waveguide Based on Type-I Modal Phase Matching

et al. 2023

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We numerically investigate a second harmonic generation (SHG) in a z-cut lithium niobate on insulator (LNOI) waveguide based on type-I mode phase matching (MPM) between two fundamental modes. A mode overlap factor that is close to unity is achieved and the normalized SHG efficiency reaches up to 72.1% W−1cm−2 at the telecommunication band, together with a large spectral tunability of 2.5 nm/K. Moreover, a bandwidth of about 100 nm for the broad SHG in a 5 mm-long LNOI ridge waveguide is demonstrated with this scheme. This stratagem will inspire new integrated nonlinear frequency conversion methods for versatile applications.

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Effect of dimension variation for second-harmonic generation in lithium niobate on insulator waveguide [Invited]

Cited by 8 publications

References 11 publications

In-band intermodulation induced by transient response of erbium-doped fiber amplifier

In-band intermodulation induced by transient response of erbium-doped fiber amplifier

Ultra-broadband and low-loss edge coupler for highly efficient second harmonic generation in thin-film lithium niobate

Broadband Second Harmonic Generation in a z-Cut Lithium Niobate on Insulator Waveguide Based on Type-I Modal Phase Matching

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