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Related Concept Videos

Passive Filters01:27

Passive Filters

1.0K
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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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:
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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Space Trusses01:25

Space Trusses

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. The space truss is widely used in various construction projects due to its adaptability and capacity to withstand complex loads.
At the core of a space truss lies the fundamental unit known as the tetrahedron. This structure is composed of six members that form a three-dimensional shape...
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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Operational Amplifiers01:17

Operational Amplifiers

2.0K
The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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Writing Bragg Gratings in Multicore Fibers
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Add-drop filter with complex waveguide Bragg grating and multimode interferometer operating on arbitrarily spaced

Shengjie Xie, Jiahao Zhan, Yiwen Hu

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    Summary
    This summary is machine-generated.

    We developed a new silicon nitride/silicon dioxide add-drop filter using multimode interferometers and complex waveguide Bragg gratings. This device enables flexible, ultrabroadband optical channel selection with high performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Materials Science

    Background:

    • Optical add-drop filters are crucial components in wavelength-division multiplexing (WDM) systems.
    • Existing filters often face limitations in channel spacing flexibility and bandwidth.
    • Silicon nitride/silicon dioxide platforms offer advantages for integrated photonic devices.

    Purpose of the Study:

    • To demonstrate a novel add-drop filter capable of operating on arbitrarily spaced optical channels.
    • To achieve high rejection ratios and low insertion loss in an integrated photonic device.
    • To explore the potential of multimode interferometers (MMIs) combined with complex waveguide Bragg gratings (CWBGs) for advanced filtering functionalities.

    Main Methods:

    • Fabrication of an add-drop filter using silicon nitride/silicon dioxide layers.
    • Integration of multimode interferometers (MMIs) with complex waveguide Bragg gratings (CWBGs).
    • Design and implementation of the CWBG using the Layer Peeling/Layer Adding algorithm.

    Main Results:

    • The MMI-CWBG add-drop filter demonstrated a rejection ratio exceeding 40 dB across five channels.
    • Achieved a narrow line width of 1.2 nm and low on-chip loss below 1 dB.
    • The filter platform exhibited capability for ultrabroadband operation on arbitrarily spaced channels.

    Conclusions:

    • The MMI-CWBG platform provides a versatile solution for flexible optical channel add-drop.
    • The Layer Peeling/Layer Adding algorithm enables precise design of CWBGs for broadband operation.
    • This technology holds promise for next-generation WDM networks and optical signal processing.