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Related Concept Videos

Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Modes of Operations of BJT01:21

Modes of Operations of BJT

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...
Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
MOSFET01:16

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...

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Updated: Jun 20, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization
08:19

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Multimode integrated optical bistable switch.

E Garmire, S D Allen, J Marburger

    Optics Letters
    |August 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel optical bistable switch using a lithium niobate phase modulator. This non-integrated device demonstrated bistability and discriminator operation with a helium-neon laser.

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    Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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    Characterization of Anisotropic Leaky Mode Modulators for Holovideo

    Published on: March 19, 2016

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    Last Updated: Jun 20, 2026

    Patterning via Optical Saturable Transitions - Fabrication and Characterization
    08:19

    Patterning via Optical Saturable Transitions - Fabrication and Characterization

    Published on: December 11, 2014

    Characterization of Anisotropic Leaky Mode Modulators for Holovideo
    09:36

    Characterization of Anisotropic Leaky Mode Modulators for Holovideo

    Published on: March 19, 2016

    Area of Science:

    • Photonics and optical engineering
    • Integrated optics
    • Nonlinear optics

    Background:

    • Optical bistability is a key phenomenon for all-optical switching and signal processing.
    • Integrated optical devices offer miniaturization and high-speed operation.
    • Lithium niobate (LiNbO3) is a widely used material for electro-optic modulators.

    Purpose of the Study:

    • To construct and test a multimode integrated optical bistable switch.
    • To investigate the feasibility of a non-cavity configuration for optical bistability.
    • To demonstrate bistability and discriminator operation in the fabricated device.

    Main Methods:

    • Fabrication of a multimode integrated optical switch utilizing a LiNbO3 phase modulator.
    • Testing the device in a non-cavity configuration.
    • Utilizing a helium-neon (He-Ne) laser as the light source.

    Main Results:

    • Successful construction and testing of the optical bistable switch.
    • Observation of optical bistability, where the output power is a nonlinear function of the input power.
    • Demonstration of discriminator operation, indicating potential for signal processing applications.

    Conclusions:

    • A non-cavity configuration LiNbO3 phase modulator can function as an optical bistable switch.
    • The device exhibits promising characteristics for integrated optical signal processing.
    • Further research can explore optimizing the design for enhanced performance.