Efficient Electro-optic Modulation on Thin Film Lithium Niobate

Jin, Mingwei; Chen, Jiayang; Sua, Yong Meng; Huang, Yu‐Ping

doi:10.1364/fio.2020.fw7d.4

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…Recently, nanophotonic PPLN waveguides have been realized using thin film lithium niobate (TFLN), promising ultrahigh normalized nonlinear efficiency because of much tighter mode confinement [11][12][13]. Also, they allow the dense integration of a diverse variety of functional components, like electro-optic modulators [14,15], heralded single photon sources [16], and photon detectors [17], on a single chip. It is thus appealing to realize QFC on the same nanophotonic platform for some impactful quantum applications.…”

Section: Introductionmentioning

confidence: 99%

Photon Conversion in Thin-film Lithium Niobate Nanowaveguides: A Noise Analysis

Fan,

Ma,

Chen

et al. 2021

Preprint

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Wavelength transduction of single-photon signals is indispensable to networked quantum applications, particularly those incorporating quantum memories. Lithium niobate nanophotonic devices have demonstrated favorable linear, nonlinear, and electro-optical properties to deliver this crucial function while offering superiror efficiency, integrability, and scalability. Yet, their quantum noise level-an crucial metric for any single-photon based application-has yet to be understood. In this work, we report the first study with the focus on telecom to near-visible conversion driven by a telecom pump of small detuning, for practical considerations in distributed quantum processing over fiber networks. Our results find the noise level to be on the order of 10 −4 photons per time-frequency mode for high conversion, allowing faithful pulsed operations. Through carefully analyzing the origins of such noise and each's dependence on the pump power and wavelength detuning, we have also identified a formula for noise suppression to 10 −5 photons per mode. Our results assert a viable, low-cost, and modular approach to networked quantum processing and beyond using lithium niobate nanophotonics.

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Section: Introductionmentioning

confidence: 99%

Photon Conversion in Thin-film Lithium Niobate Nanowaveguides: A Noise Analysis

Fan,

Ma,

Chen

et al. 2021

Preprint

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“…If an optical modulator is to be integrated with existing systems, it should maintain a small device footprint, feature a wide RF bandwidth and remain environmentally stable for reliable operation in any environment [14]- [16], [21], [25]. Moreover, the ideal optical modulator boasts a high (>35dB) extinction ratio [8], [10], [14], [26], [27]. At first glance, Si-based free carrier plasma dispersion-based modulators would seem the ideal candidate, but their low cost and excellent scalability is overshadowed by poor extinction ratio and bandwidth; an inherent limitation of a dispersion-based modulation scheme [17], [28], [29].…”

Section: Introductionmentioning

confidence: 99%

Ultra-High Extinction Dual-Output Thin-Film Lithium Niobate Intensity Modulator

et al. 2022

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A low voltage, wide bandwidth compact electro-optic modulator is a key building block in the realization of tomorrow's communication and networking needs. Recent advances in the fabrication and application of thin-film lithium niobate, and its integration with photonic integrated circuits based in silicon make it an ideal platform for such a device. In this work, a high-extinction dual-output folded electro-optic Mach Zehnder modulator in the silicon nitride and thin-film lithium niobate material system is presented. This modulator has an interaction region length of 11 mm and a physical length of 7.8 mm. The device demonstrates a fiber-to-fiber loss of roughly 12 dB using on-chip fiber couplers and DC half wave voltage (Vπ) of less than 3.0 V, or a modulation efficiency (Vπ•L) of 3.3 V•cm. The device shows a 3 dB bandwidth of roughly 30 GHz. Notably, the device demonstrates a power extinction ratio over 45 dB at each output port without the use of cascaded directional couplers or additional control circuitry; roughly 31 times better than previously reported devices. Paired with a balanced photo-diode receiver, this modulator can be used in various photonic communication systems. Such a detecting scheme is compatible with complex modulation formats such as differential phase shift keying and differential quadrature phase shift keying, where a dualoutput, ultra-high extinction device is fundamentally paramount to low-noise operation of the system.

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“…Unlike previous realizations, here the system is constructed using purely passive optics without any optical gain [16,17,20]. Furthermore, the whole structure is monolithic etched using standard LNOI fabrication recipes, by which a variety of other optical elements, such as electro-optical modulators [21,22], frequency converters [23,24], filters, and photon sources [25], can be integrated on the same chip. This highlights the prospect of creating exotic chips that consolidate coherent, non-Hermitian, and anti-Hermitian optical circuits, for applications in areas of photonic computing, communications, sensing, and so on.…”

Section: Introductionmentioning

confidence: 99%

Anti-Parity-Time Symmetry in Passive Nanophotonics

Fan¹,

Chen²,

Zhao³

et al. 2020

Preprint

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Parity-time (PT) symmetry in non-Hermitian optical systems promises distinct optical effects and applications not found in conservative optics. Its counterpart, anti-PT symmetry, subscribes another class of intriguing optical phenomena and implies complementary techniques for exotic light manipulation. Despite exciting progress, so far anti-PT symmetry has only been realized in bulky systems or with optical gain. Here, we report an on-chip realization of non-Hermitian optics with anti-PT symmetry, by using a fully-passive, nanophotonic platform consisting of three evanescently coupled waveguides. By depositing a metal film on the center waveguide to introduce strong loss, an anti-PT system is realized. Using microheaters to tune the waveguides' refractive indices, striking behaviors are observed such as equal power splitting, synchronized amplitude modulation, phase-controlled dissipation, and transition from anti-PT symmetry to its broken phase. Our results highlight exotic anti-Hermitian nanophotonics to be consolidated with conventional circuits on the same chip, whereby valuable chip devices can be created for quantum optics studies and scalable information processing.

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Efficient Electro-optic Modulation on Thin Film Lithium Niobate

Abstract: We demonstrate an electro-optic modulator on thin-film lithium niobate using a novel dual-capacitor scheme. The voltage-length product reaches 0.64 volt × cm, thus substantially reducing the driving electric power.

Cited by 6 publications

References 5 publications

Photon Conversion in Thin-film Lithium Niobate Nanowaveguides: A Noise Analysis

Photon Conversion in Thin-film Lithium Niobate Nanowaveguides: A Noise Analysis

Ultra-High Extinction Dual-Output Thin-Film Lithium Niobate Intensity Modulator

Anti-Parity-Time Symmetry in Passive Nanophotonics

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