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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 2019 Joint Conference of the IEEE International Frequency Control Symposium anEuropean Frequency and Time Forum (EFTF/IFC) - Orlando, FL, USA (2019.4.14-2019.4.18)] 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC) - A Versatile Testbed for CubeSat Atomic Clock Development: EOM vs Laser Current Modulation
摘要： Atomic clocks for compact satellite missions have limitations on size, weight, and power (SWaP), while requiring ever greater levels of frequency stability and accuracy. To aid in the development of next-generation low SWaP Coherent Population Trapping (CPT) clocks, we are developing a CubeSat Atomic Clock Testbed (CuSACT). This testbed will give us the capability to vary single aspects of CPT-clock design while keeping all others constant. In this presentation, we will provide an overview of CuSACT, and discuss our preliminary results comparing direct injection-current modulation of a VCSEL with electro-optic phase modulation of the VCSEL.
关键词： vapor-cell atomic clock,coherent population trapping,Rb clock,frequency modulation,electro-optic modulation,VCSEL,optical sidebands
更新于2025-09-16 10:30:52
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Comparative Study of Silicon Photonic Modulators based on Transparent Conducting Oxide and Graphene
摘要： Transparent conducting oxides (TCOs) and graphene have been extensively investigated as promising materials for electro-optic modulation applications due to their dynamically configurable near-infrared properties. In this study, a detailed comparison between modulators comprising either a TCO film or a graphene-insulator-graphene structure is presented, considering a conventional silicon photonic waveguide as the underlying physical system. Both in-line and resonant configurations are investigated, integrating an electro-optic switching mechanism that changes the free-carrier concentration in the configurable material by means of electrical gating. The carrier-concentration change effect is rigorously modeled using solid-state physics principles, providing a physically consistent and straightforward comparison between the investigated material platforms. The performance of the designed modulators is thoroughly evaluated in terms of the extinction ratio, insertion loss, energy consumption, and bandwidth in both TE and TM operation. On the whole, both technologies support high-performance optical modulation, with TCO designs exhibiting an up to 40% smaller footprint, with their graphene counterparts standing out for their subpicojoule-per-bit performance on a physical system as simple as the employed silicon-wire waveguide. The low insertion losses as well as the impressive over-100-GHz switching speeds suggest both TCOs and graphene as very promising material candidates for future on-chip modulation applications.
关键词： silicon photonic modulators,transparent conducting oxide,near-infrared properties,electro-optic modulation,graphene
更新于2025-09-12 10:27:22
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Analysis of RF Photonic Link Linearization Using Truncated Fourier Series
摘要： This paper analyzes analog electro-optic modulator linearization techniques employing modulation of multiple distinct carriers with differing modulation efficiencies. We describe a general framework for calculating intermodulation distortion for this type of composite modulation approach. The problem of compensation of nonlinear distortions above 3rd order in electro-optic links to optimize spur free dynamic range is formulated using truncated Fourier series, where the choice of RF photonic link parameters is shown to be equivalent to a corresponding window function applied to the truncated Fourier series representation of a desired transfer function.
关键词： intermodulation distortion,Electro-optic modulation,modeling
更新于2025-09-11 14:15:04