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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

708
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
708
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.6K
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

764
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
764

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Programmable microwave photonic filtering with coupled ring resonators.

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    This summary is machine-generated.

    Coupled resonator optical waveguides (CROWs) offer efficient microwave photonic filtering for radio frequency over fiber systems. Cascading two CROW filters enhances performance, enabling programmable spectral width and frequency tuning with improved fabrication tolerance.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Integrated Optics

    Background:

    • Microwave photonic filters are essential for radio frequency (RF) over fiber applications, particularly for suppressing unwanted tones after RF to optical up-conversion.
    • Silicon-on-insulator (SOI) platforms are widely used for integrated photonic devices.

    Purpose of the Study:

    • To demonstrate the efficacy of coupled resonator optical waveguides (CROWs) as efficient microwave photonic filters on SOI platforms.
    • To investigate the performance enhancement through cascading CROW filters and their programmability.
    • To analyze the impact of a silicon nitride (SiN) capping layer on device performance and fabrication tolerance.

    Main Methods:

    • Fabrication of CROW devices on silicon-on-insulator.
    • Characterization of individual and cascaded CROW filters for roll-off slope and ripple.
    • Single-sideband signal generation using electro-optic modulators and cascaded CROW filters.
    • Experimental demonstration of programmable filtering through relative and simultaneous tuning.
    • Statistical analysis including chip-to-chip, intra-chip, and run-to-run variations.
    • Evaluation of SiN capping layer effects.

    Main Results:

    • Achieved roll-off slopes exceeding 4 dB/GHz with <1 dB ripple using single CROW filters.
    • Demonstrated roll-off slopes >7 dB/GHz by serially cascading two CROW filters.
    • Validated cascaded filters for single-sideband signal generation with a measured roll-off slope of 7.5 dB/GHz.
    • Showcased programmable filtering: spectral width tuning (470 to 23 GHz) and center frequency tuning (up to 1.2 THz).
    • SiN capping layer improved fabrication tolerance and enhanced extinction ratio by 5 dB.

    Conclusions:

    • CROWs are efficient microwave photonic filters on SOI platforms.
    • Cascading CROW filters significantly boosts performance and enables programmable filtering capabilities.
    • SiN capping layer offers practical advantages for device fabrication and performance.