- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Bengaluru, India (2018.12.17-2018.12.19)] 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Simultaneous generation of laser sources in S, C and L bands through four-wave mixing of electro-optic frequency combs
摘要： Increasing bandwidth demands necessitate the use of several carriers in wavelength division multiplexing. Conventionally, carrier wavelengths were generated by individual lasers which suffer from large area and power requirements with scaling of number of carriers. We demonstrate simultaneous generation of over 316 wavelengths in S, C and L bands from two lasers spaced 4 nm apart in the C-band. Electro-optic modulators initially scale each laser to 9 lines (in 20 dB bandwidth). The electro-optic frequency combs are power scaled to ~800 mW and undergo cascaded four-wave mixing in highly nonlinear fiber to generate wavelengths in the three bands. The number of lines in 20 dB bandwidth in S, C and L bands are 88, 160 and 68 respectively. This system can also be used for RF arbitrary waveform generation.
关键词： four-wave mixing,electro-optic modulators,wavelength division multiplexing,highly nonlinear fibers
更新于2025-09-19 17:13:59
-
A compact 120??GHz monolithic silicon-on-silica electro-optic modulator
摘要： A novel electro-optic modulator using the silicon-on-silica platform is proposed. The modulator utilizes a modified version of the gate-all-around switching mechanism which is well-known in MOSFET transistors. The waveguide silicon core is surrounded by oxide and metal to increase the effect of the applied voltage in charge depletion and accumulation and hence the optical phase shift. The modulator features a very high switching speed of 120 GHz, thanks to its very low capacitance, with a total insertion loss of 4.6 dB and a phase-shifter length of 500 μm. The proposed modulator can therefore serve in high speed applications such as the backbone circuits of the new 5G telecommunications networks.
关键词： Integrated optics,Electro-optic modulators,Silicon photonics
更新于2025-09-19 17:13:59
-
[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Optimization of Coplanar Waveguide Structure for Ultra Wideband Integrated Electro-optic Mach Zehnder Modulator
摘要： Using numerical tools, coplanar waveguide (CPW) transmition line is optimized to be utilized in ultra-compact traveling wave electro-optic modulators (EOMs). Important factors such as minimization of the radio frequency (RF) loss, impedance mismatch, and velocity mismatch are investigated. Our results reveal that coplanar waveguide can provide conditions for ultra compact Mach-Zehnder modulators (MZM) to operate at frequencies up to terahertz range.
关键词： velocity mismatch,electro-optic modulators,impedance mismatch,RF loss,coplanar waveguide
更新于2025-09-12 10:27:22
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Frequency Comb Generation at 2 μm with Electro-Optic Modulators for Spectroscopic Applications
摘要： Mid-infrared (2–20 μm) gas sensing allows the detection of strong molecular absorptions with rather small absorption lengths (≤1 m). Various techniques can perform spectroscopic measurements in the mid-infrared but dual-comb spectroscopy (DCS) is one of the most powerful knowing its precision and real-time abilities [1]. However, setups used to perform DCS are in general complex since they require the phase locking of two independent femtosecond lasers at the known state of the art stability. This particular drawback can be bypassed if the combs are generated with electro-optic modulators (EOM) [2]. However, these equipments operate in the telecommunication wavelengths, generally near 1.55 μm where molecular absorptions are not very intense. Here, we experimentally demonstrate two different techniques of generating frequency combs with EOMs around 2 μm.
关键词： Spectroscopic applications,Frequency comb generation,Mid-infrared,Electro-optic modulators,Dual-comb spectroscopy
更新于2025-09-11 14:15:04
-
Graphene mechanical pixels for Interferometric Modulator Displays
摘要： Electro-optic modulators based on micro-electromechanical systems have found success as elements for optical projectors, for simplified optical spectrometers, and as reflective-type screens that make use of light interference (Interferometric Modulator Display technology). The latter concept offers an exciting avenue for graphene nanomechanical structures to replace classical micro-electromechanical devices and bring about enhancement in performance, especially switching speed and voltage. In this work we study the optical response of electrically actuated graphene drumheads by means of spectrometric and stroboscopic experiments. The color reproducibility and speed of these membranes in producing the desired electro-optic modulation makes them suitable as pixels for high refresh rate displays. As a proof of concept, we demonstrate a Graphene Interferometric Modulator Display prototype with 5 μm-in-diameter pixels that compose a high resolution image (2500 pixels per inch)—equivalent to a 5″ display of 12K—whose color can be changed at frame rates of at least 400 Hz.
关键词： high refresh rate displays,electro-optic modulators,Interferometric Modulator Display,micro-electromechanical systems,graphene
更新于2025-09-10 09:29:36
-
Epitaxial ferroelectric oxide thin films for optical applications
摘要： Ferroelectrics are non-centrosymmetric crystalline materials that possess a spontaneous polarization that can be switched by an electric field. The electric-field-dependent optical response of these materials makes them important for optical devices, such as modulators or beam deflectors. In the inexorable drive to miniaturization, the concept of integrated thin film optical devices has led to the incorporation of ferroelectric thin films on single-crystal substrates. These structures have appealing electro-optic modulation characteristics, interesting strain-dependent bandgaps and refractive index, as well as promising possibilities for solar harvesting. Here, we review the work on epitaxial ferroelectric (FE) films for optical applications. We first show that FE thin film materials are attractive for integrated electro-optic modulators and then show that epitaxial strain can be used to enhance the FE and optical functionality of films. Next, we describe some of the photovoltaic functionality of FE thin film materials’ systems and conclude the review by highlighting some thin-film devices that exploit the aforementioned optical effects.
关键词： epitaxial strain,electro-optic modulators,thin films,photovoltaic,optical applications,ferroelectric
更新于2025-09-09 09:28:46