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- 摘要
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- 实验方案
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Non-Volatile Indium Tin Oxide Electro-Optic Switch
摘要： The abstract of the paper is not provided in the given text.
关键词： non-volatile,silicon photonics,indium tin oxide,electro-optic switch
更新于2025-09-23 15:19:57
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A tunable self-mixing chaotic laser based on high frequency electro-optic modulation
摘要： A tunable self-mixing chaotic laser based on high frequency electro-optical modulation is proposed. A laser dynamics system is designed and tested for tunable chaotic laser generation and provides optical feedback and electro-optic modulation with two degrees of freedom. The chaotic laser is generated by optical feedback, and it becomes tunable by high frequency electro-optic modulation. The frequency is modulated from 10 MHz to 10 GHz to test this system, and an ultra-wide band chaotic laser from 0.8 GHz to 24 GHz is measured by an electrical spectrum analyzer (ESA). The experimental results show the generation of a tunable chaotic laser via electro-optic modulation. At the same time, this tunable chaotic laser has a highly sensitive dynamic response near the 2.0 GHz range of frequency modulation. The system is proved to be suitable for applications in high-speed broadband communication and sensing.
关键词： Optical injection,Laser self-mixing,Electro-optic modulation,Chaotic laser
更新于2025-09-23 15:19:57
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[IEEE TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON) - Kochi, India (2019.10.17-2019.10.20)] TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON) - Low-Frequency Effectiveness of Differential Detection for Electro-optic Sensor System
摘要： This paper describes the effectiveness of differential detection for reducing laser noise in the low-frequency region in an electro-optic (EO) sensor system. Improvement in the signal-to-noise ratio (SNR) is necessary for expanding the applications of EO sensor systems. In a previous work, an alternating current coupling was used at an optical receiver to eliminate a direct current (DC) signal. As a result, the low-frequency effectiveness of the differential detection could not be estimated. Therefore, in this study, we modified a photodiode bias circuit for DC coupling measurement.
关键词： phasor diagram,differential detection,fast Fourier transform,signal-to-ratio,electro-optic sensor
更新于2025-09-23 15:19:57
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Nonlinearity-compensation-free optical frequency domain reflectometry based on electrically-controlled optical frequency sweep
摘要： A nonlinearity-compensation-free optical frequency domain reflectometry (OFDR) scheme is proposed and experimentally demonstrated based on the electrically-controlled optical frequency sweep. In the proposed scheme, the linear frequency sweep light is generated by propagating an ultra-narrow-linewidth continuous-wave light through an electro-optic frequency shifter which consists of a dual-parallel Mach-Zehnder modulator and an electronic 90° hybrid, where the electro-optic frequency shifter is driven by a linear frequency modulated signal generated by a direct digital synthesizer. Experimental results show that the spatial resolution and signal-to-noise ratio (SNR) of the proposed OFDR scheme without the nonlinear phase compensation are comparable to those of the OFDR employing a commercial tunable light source (TLS), an auxiliary interferometer and a software-based nonlinear phase compensation method. The proposed OFDR scheme is helpful to reduce the complexity of optical structure and eliminate the difficulty of developing nonlinear phase compensation algorithm.
关键词： optical frequency domain reflectometry (OFDR),electro-optic frequency shifter,Dual-parallel Mach-Zehnder modulator,optical fiber sensor
更新于2025-09-23 15:19:57
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Synthesis of second-order nonlinear optical chromophores with conjugated steric hindrances for electro-optics @850 nm
摘要： Electro-optic materials at the shortwave infrared window (850 nm) of optical fiber is significant for free-space telecommunication and short-distance local area network. However, most of current high-performance organic nonlinear optical chromophores (absorption bandgap ~1.5 eV) are designed for the operation windows of 1310 nm (O band) or 1550 nm (C band), which are not transparent at 850 nm (bandgap ~1.45 eV). The design and synthesis of chromophores for 850 nm is more challenging because regular bandgap engineering to improve microcroscopic nonlinearity (μβ value) might be not available due to the bandgap restriction (optical transparency) @ 850 nm. In this respect, this manuscript utilizes the strategy of suitable site-isolation in molecular engineering to optimize comprehensive performance of chromophores for electro-optics @850 nm. Vilsmeier formylation is facilitated on symmetric or asymmetric donor-π-donor intermediate dyes to form donor-π-acceptor (D-π-A) chromophores C1 and C2 with tuneable conjugated steric hindrance (site-isolator). Without significant red-shift of absorption spectra, conjugated steric hindrance groups contribute to large enhancement of chromophores’ μβ values and ensure optical transparency @ 850 nm. The μβ values of C1 (6706 ? 10-48 esu) and C2 (7279 ? 10-48 esu) with conjugated site-isolation groups are much higher than previously reported chromophores for 850 nm. The structure-property relation reveals that a suitable site-isolator is extremely significant for realizing highly efficient translation of microscopic hyperpolarizability into macroscopic electro-optic coefficients. As a results, electro-optic coefficients of 94 pm/V @ 830 nm are achieved. To the best of our knowledge, this is the highest value for organic electro-optics materials @ 850 nm.
关键词： Electro-optic materials,Vilsmeier formylation,conjugated steric hindrance,site-isolation,nonlinear optical chromophores
更新于2025-09-23 15:19:57
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Demonstration of a Reconfigurable Entangled Radio-Frequency Photonic Sensor Network
摘要： Quantum metrology takes advantage of nonclassical resources such as entanglement to achieve a sensitivity level below the standard quantum limit. To date, almost all quantum-metrology demonstrations are restricted to improving the measurement performance at a single sensor, but a plethora of applications require multiple sensors that work jointly to tackle distributed sensing problems. Here, we propose and experimentally demonstrate a reconfigurable sensor network empowered by continuous-variable (CV) multipartite entanglement. Our experiment establishes a connection between the entanglement structure and the achievable quantum advantage in different distributed sensing problems. The demonstrated entangled sensor network is composed of three sensor nodes each equipped with an electro-optic transducer for the detection of radio-frequency (RF) signals. By properly tailoring the CV multipartite entangled states, the entangled sensor network can be reconfigured to maximize the quantum advantage in distributed RF sensing problems such as measuring the angle of arrival of an RF field. The rich physics of CV multipartite entanglement unveiled by our work would open a new avenue for distributed quantum sensing and would lead to applications in ultrasensitive positioning, navigation, and timing.
关键词： distributed sensing,entanglement,quantum metrology,electro-optic transducer,radio-frequency
更新于2025-09-23 15:19:57
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Dispersion Measurement of Electro-Optic Coefficient ?322 of Lithium Niobate Based on Photoelastic Modulation
摘要： A novel method for determining the electro-optic (EO) coe?cient γ22 of lithium niobate and its dispersion using photoelastic modulation is presented. A spectroscopic polarimetry was constructed with the photoelastic modulator (PEM), and a monochromator was selected to automatically scan the wavelength of a light source. Phase retardation induced by an EO sample was loaded into the modulation signals to demodulate the EO coe?cients. The PEM and data processing were controlled in the same ?eld programmable gate array (FPGA), and the DC and harmonic terms were extracted simultaneously by employing digital phase-locked technology. An experimental system was built to analyze the principle of this scheme in detail. After the modulation phase retardation amplitude of the PEM was precisely calibrated, the EO coe?cient γ22 of a Y-cut lithium niobate crystal plate was measured in the spectral range from 0.42 to 0.8 μm. The experimental results demonstrated that the measurement sensitivity of the system was 1.1 × 10?14 m/V for a sampling time of 198.9 ms. Plotting the measured results against the light wavelength, the dispersion of the EO coe?cients was obtained similar to the Cauchy dispersion formula γ22 = 5.31 × 10?12 + 4.071 × 10?13/λ2 + 7.184 × 10?14/λ4 in the visible light range. This method is suitable for studying dispersion of the EO coe?cients of crystals as well as of thin ?lms and two-dimensional materials.
关键词： electro-optic (EO) coe?cient,digital phase-locked technology,polarization modulation,dispersion measurement
更新于2025-09-23 15:19:57
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Laser-diode dual-end-pumped electro-optic Q-switched slab Tm:YAP laser
摘要： A high-repetition-rate and double-end pumped electro-optic Q-switched Tm:YAlO3 (Tm:YAP) laser is reported. The Tm:YAP slab crystal cut by c-axis is used as the laser gain medium, and the RbTiOPO4(RTP) crystal is selected as the electro-optic Q-switched crystal. Choosing volume Bragg gratings (VBG) as the input mirror to narrow the output line width. When the pump power is 79.2 W, at a repetition rate of 10 kHz, maximum average-output-power of 21.96 W is achieved, with the pulse width of 20.64 ns and output energy of 2.20 mJ. The output peak power is 107.3 kW and the slope efficiency is 29.2%. The center wavelength is 1937.87 nm and the line width is 0.73 nm. The beam quality in the x direction is 1.48, and in the y direction is 1.50.
关键词： Electro-optic Q-switch,High repetition rate,Tm:YAP laser,RTP
更新于2025-09-23 15:19:57
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Highly Flexible and Voltage Based Wavelength Tunable Biosensor
摘要： A plasmonic absorber as a biosensor based on the highly flexible electro-optic material is numerically investigated. The structure demonstrates multispectral high absorption in visible and unity absorption in the near-infrared range. The resonant wavelengths are extremely sensitive to the applied voltage, variation in geometric parameters, and the refractive index of the background material, resulting in wavelength-tunable absorption that can be used for tunable sensors and filters. The refractive index based sensitivity is calculated on different voltages to adjust the resonances to the desired point in a wide waveband for detecting a large number of different biomaterials. The electro-optic tunability can be used to reduce fabrication errors and use of scaling. In addition, strong field absorption, broad resonant peaks, and wide incident angle absorption versatility are found in the proposed structure which can be applied for energy harvesting, infra-red detection, and surface-enhanced Raman spectroscopy purposes.
关键词： electro-optic,plasmonics,detection,photonics,nanosystems,metasurface
更新于2025-09-19 17:15:36
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Hybrid Graphene-Silicon Based Polarization-Insensitive Electro-Absorption Modulator with High-Modulation Efficiency and Ultra-Broad Bandwidth
摘要： Polarization-insensitive modulation, i.e., overcoming the limit of conventional modulators operating under only a single-polarization state, is desirable for high-capacity on-chip optical interconnects. Here, we propose a hybrid graphene-silicon-based polarization-insensitive electro-absorption modulator (EAM) with high-modulation efficiency and ultra-broad bandwidth. The hybrid graphene-silicon waveguide is formed by leveraging multi-deposited and multi-transferred methods to enable light interaction with graphene layers in its intense field distribution region instead of the commonly used weak cladding region, thus resulting in enhanced light–graphene interaction. By optimizing the dimensions of all hybrid graphene-silicon waveguide layers, polarization-insensitive modulation is achieved with a modulation efficiency (ME) of ~1.11 dB/μm for both polarizations (ME discrepancy < 0.006 dB/μm), which outperforms that of previous reports. Based on this excellent modulation performance, we designed a hybrid graphene-silicon-based EAM with a length of only 20 μm. The modulation depth (MD) and insertion loss obtained were higher than 22 dB and lower than 0.23 dB at 1.55 μm, respectively, for both polarizations. Meanwhile, its allowable bandwidth can exceed 300 nm by keeping MD more than 20 dB and MD discrepancy less than 2 dB, simultaneously, and its electrical properties were also analyzed. Therefore, the proposed device can be applied in on-chip optical interconnects.
关键词： integrated optical devices,electro-optic modulator,silicon photonics,graphene
更新于2025-09-19 17:15:36