- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Mid-Infrared Electro-Optical Modulation Using Monolithically Integrated Titanium Dioxide on Lithium Niobate Optical Waveguides
摘要： tunable photonic circuits were demonstrated in the mid-infrared (mid-iR) regime using integrated tio2-on-Linbo3 (toL) waveguides. the upper waveguide ridge was made by a sputtered tio2 thin film with broad transparency at λ = 0.4–8 μm and an optimized refractive index n = 2.39. The waveguide substrate is a z-cut single crystalline Linbo3 (LN) wafer that has strong Pockels effect, thus enabling the tunability of the device through electro-optical (e-o) modulation. A sharp waveguide mode was obtained at λ = 2.5 μm without scattering or mode distortion found. The measured E-O coefficient γeff was 5.9 pm/V approaching γ31 of 8.6 pm/V of LN. The ToL waveguide showed a hybrid mode profile where its optical field can be modified by adjusting the TiO2 ridge height. our monolithically integrated ToL modulator is an efficient and small footprint optical switch critical for the development of reconfigurable photonic chips.
关键词： electro-optical modulation,lithium niobate,optical waveguides,mid-infrared,titanium dioxide
更新于2025-09-23 15:19:57
-
Edge-plasmon assisted electro-optical modulator
摘要： An efficient electro-optical modulation has been demonstrated here by using an edge-plasmon mode specific for the hybrid plasmonic waveguide. Our approach addresses a major obstacle of the integrated microwave photonics caused by the polarization constraints of both active and passive components. In addition to subwavelength confinement, typical for surface plasmon polaritons, the edge-plasmon modes enable exact matching of the polarization requirements for silicon based input/output grating couplers, waveguides, and electro-optical modulators. A concept of the hybrid waveguide, implemented in a sandwichlike structure, implies a coupling of propagating plasmon modes with a waveguide mode. The vertically arranged sandwich includes a thin layer of epsilon-near-zero material (indium tin oxide) providing an efficient modulation at small length scales. Employed edge plasmons possess a mixed polarization state and can be excited with horizontally polarized waveguide modes. It allows the resulting modulator to work directly with efficient grating couplers and avoid using bulky and lossy polarization converters. A 3D optical model based on Maxwell equations combined with drift-diffusion semiconductor equations is developed. Numerically heavy computations involving the optimization of materials and geometry have been performed. Effective modes, stationary state field distribution, an extinction coefficient, optical losses, and charge transport properties are computed and analyzed. In addition to the polarization matching, the advantages of the proposed model include the compact planar geometry of the silicon waveguide, reduced active electric resistance R and a relatively simple design, attractive for experimental realization.
关键词： polarization constraints,hybrid plasmonic waveguide,drift-diffusion semiconductor equations,electro-optical modulation,edge-plasmon mode,indium tin oxide,epsilon-near-zero material,Maxwell equations
更新于2025-09-11 14:15:04
-
[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - A DC to 40 GHz, High Linearity Monolithic GaAs Distributed Amplifier with Low DC Power Consumption as a High Bit-Rate Pre-Driver
摘要： This paper presents the design and the performance of a six stage GaAs MMIC distributed amplifier (DA) for optical driver applications. The DA is fabricated in a commercially available 0.15 μm GaAs p-HEMT technology. The amplifier exhibits 13 dB of small gain over 40 GHz of 3 dB bandwidth with a power consumption equal to 550 mW. Group delay time variation up to 30 GHz is only ±7 ps. The output power is higher than 16 dBm (4 Vpp), which makes the circuit suitable as a preamplifier for lithium-niobate (LiNbO3) optical modulator driver. The DA is demonstrated as a part of the modulator driver in a 12.5 GBps PAM-4 (25Gbps) optical system by using the eye diagram as a figure of merit.
关键词： Optical Drives,LiNbO3 Optical modulator,electro-optical modulation,Wideband amplifier,Optical amplifier,modulator,Traveling-wave amplifier,pre-driver,MMIC,Distributed Amplifier
更新于2025-09-04 15:30:14