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Related Concept Videos

Passive Filters01:27

Passive Filters

1.1K
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...
1.1K
Active Filters01:25

Active Filters

1.4K
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:
1.4K
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....
570
Design Example01:23

Design Example

584
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
584
Op Amp AC Circuits01:18

Op Amp AC Circuits

546
Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
546
Modes of Operations of BJT01:21

Modes of Operations of BJT

2.1K
A Bipolar Junction Transistor (BJT) is a versatile component in electronics, functioning in four distinct modes based on the biasing of its junctions: active, saturation, cut-off, and inverted modes.
Active Mode: The most common mode for amplification, the active mode features a forward-biased emitter-base junction and a reverse-biased base-collector junction. This setup enables electrons to be injected from the emitter to the base while blocking the majority carriers at the collector. The...
2.1K

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Broadband high-order mode pass filter based on mode conversion.

Kazi Tanvir Ahmmed, Hau Ping Chan, Binghui Li

    Optics Letters
    |September 16, 2017
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel high-order mode pass filter using mode converters for planar lightwave circuits. This adaptable filter design demonstrates excellent performance in the C-band, offering a new solution for optical signal processing.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Waveguide Technology

    Background:

    • High-order mode filters are crucial for advanced optical signal processing.
    • Existing filters often lack flexibility in order or material platform compatibility.
    • Mode converters offer a promising avenue for novel filter designs.

    Purpose of the Study:

    • To propose and demonstrate a versatile high-order mode pass filter concept.
    • To enable filters of any order using available mode converters.
    • To validate the design on various planar lightwave circuit platforms.

    Main Methods:

    • Utilized mode converters to design a high-order mode pass filter.
    • Fabricated a broadband fundamental mode filter using a Mach-Zehnder interferometer and Y-junctions.
    • Experimentally characterized the filter's performance in the 1.530-1.565 μm wavelength range.

    Main Results:

    • Achieved a simulated extinction ratio of 37 dB for first-order mode transmission.
    • Demonstrated an excess loss of 0.52 dB for the fundamental mode.
    • Validated broadband operation within the C-band (1.530-1.565 μm).

    Conclusions:

    • The proposed concept successfully implements a high-order mode pass filter.
    • The design is adaptable to various orders and planar lightwave circuit platforms.
    • Experimental results confirm the filter's effectiveness for optical signal processing.