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Related Concept Videos

Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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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All-optical logic based on silicon micro-ring resonators.

Qianfan Xu, Michal Lipson

    Optics Express
    |June 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We achieved all-optical logic operations using a silicon ring resonator, demonstrating AND and NAND gates at 310 Mbit/s. Active carrier extraction can boost the bit-rate beyond the free-carrier lifetime limit.

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    Area of Science:

    • Integrated photonics
    • Silicon photonics
    • Nonlinear optics

    Background:

    • All-optical logic circuits offer potential for high-speed data processing.
    • Silicon photonics enables miniaturization and integration of optical devices.
    • Free-carrier effects in silicon are crucial for all-optical modulation.

    Purpose of the Study:

    • To demonstrate all-optical logic operations in a silicon ring resonator.
    • To investigate the performance of AND and NAND gates at high bit rates.
    • To explore methods for improving the bit rate beyond the free-carrier lifetime limit.

    Main Methods:

    • Utilized a micron-size silicon ring resonator.
    • Leveraged the free-carrier dispersion effect for optical switching.
    • Implemented AND and NAND logic gate configurations.
    • Measured extinction ratios and bit rates up to 310 Mbit/s.

    Main Results:

    • Successfully demonstrated all-optical AND and NAND logic operations.
    • Achieved a ~10-dB extinction ratio at 310 Mbit/s.
    • Identified the free-carrier lifetime as a limiting factor for bit rate.
    • Showed potential for significant bit-rate improvement via active carrier extraction.

    Conclusions:

    • All-optical logic is feasible in compact silicon ring resonators.
    • The free-carrier dispersion effect enables high-speed all-optical switching.
    • Active carrier extraction is a promising technique to overcome bit-rate limitations in silicon all-optical devices.