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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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On-chip optical pulse train generation through the optomechanical oscillation.

Xiangming Xu, Hailong Pi, Wangke Yu

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    |November 23, 2021
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    Summary

    This study introduces an on-chip optical pulse train generator utilizing optomechanical oscillation. It achieves high extinction ratios and sharp pulses, offering potential for advanced fiber optic sensing applications.

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    Area of Science:

    • Optoelectronics and Photonics
    • Nanotechnology and MEMS
    • Applied Physics

    Background:

    • Optical pulse train generators (OPTGs) are crucial components in modern optical systems.
    • Existing OPTGs often face limitations in terms of on-chip integration, power efficiency, and pulse quality.
    • Optomechanical oscillation (OMO) presents a novel physical phenomenon for modulating optical fields.

    Purpose of the Study:

    • To propose and analyze a novel on-chip optical pulse train generator (OPTG) based on optomechanical oscillation (OMO).
    • To investigate the fundamental optomechanical coupling and dynamic back-action processes governing the OMO phenomenon.
    • To explore the design parameters and potential applications of the OMO-based OPTG.

    Main Methods:

    • Development of an on-chip OPTG comprising an optical cavity and a mechanical resonator.
    • Utilizing optomechanical oscillation to periodically modulate the optical cavity field and generate optical pulses.
    • Employing a dimensionless simulation method to simplify the analysis of the optomechanical system.
    • Investigating optomechanical coupling, dynamic back-action, laser detuning, and threshold power.
    • Analyzing pulse shape distortion, extinction ratio (ER), and duty cycle (DC) under varying conditions.

    Main Results:

    • Identification of a 'dead zone' that inhibits OMO, alongside derivation of optimal laser detuning and minimum threshold power.
    • Demonstration that increased input power and mechanical/optical Q-factors enhance ER and reduce DC.
    • Observation of sharper and shorter optical pulses with optimized parameters.
    • Characterization of pulse quality metrics including pulse shape distortion, ER, and DC.

    Conclusions:

    • The proposed OMO-based OPTG offers a viable pathway for generating high-quality optical pulse trains on-chip.
    • The study provides critical design guidance for optimizing OMO-based OPTGs, including parameter selection for desired pulse characteristics.
    • The OMO-based OPTG shows significant potential for applications in distributed fiber optical sensing (DFOS) and other advanced photonic systems.