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Related Concept Videos

Passive Filters01:27

Passive Filters

1.2K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
1.5K
Aliasing01:18

Aliasing

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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Clipper Circuit01:18

Clipper Circuit

1.0K
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
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Silicon wavelength-selective partial-drop broadcast filter bank.

Zhan Su, Matteo Cherchi, Erman Timurdogan

    Optics Letters
    |October 15, 2015
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    Summary

    We developed a wavelength-selective optical network using micro-ring filters for parallel data drops. This technology enables high-speed, error-free communication, forming a basis for advanced on-chip networks.

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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Optics
    • Nanophotonics

    Background:

    • Optical broadcast networks are crucial for high-speed data transmission.
    • Efficient wavelength-selective filtering is key for network scalability and performance.
    • Micro-ring resonators offer compact and tunable filtering solutions.

    Purpose of the Study:

    • To propose and demonstrate a wavelength-selective 1×N port optical broadcast network.
    • To utilize adiabatic micro-ring tunable filters for parallel optical data dropping.
    • To establish a building block for on-chip all-to-all communication networks.

    Main Methods:

    • Implementation of a 1×8 port parallel optical drop filter bank.
    • Utilization of adiabatic micro-ring tunable filters for wavelength selectivity.
    • Characterization of filter bandwidth, free spectral range, power variation, and excess loss.

    Main Results:

    • Micro-ring filters achieved 92.7±3.7 GHz bandwidth and 36.2 nm free spectral range.
    • Low-drop power variation (0.11 dB) and aggregate excess loss (1.1 dB) across all ports.
    • Error-free 10 Gbit/s data transmission with <0.5 dB power penalty in all eight drop ports.

    Conclusions:

    • The proposed wavelength-selective parallel-drop approach is effective for optical networks.
    • Adiabatic micro-ring filters provide efficient and low-loss optical signal routing.
    • This technology is a foundational component for future on-chip communication systems.