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Related Concept Videos

Small-signal Diode Model01:18

Small-signal Diode Model

In analyzing the behavior of diodes in circuits, the relationship between the current through a diode and the voltage across it is of particular interest, especially when considering the effect of a direct current (DC) bias voltage. When applied, this DC bias influences the diode's operating point, known as the Q point, around which the current-voltage (I-V) characteristic of the diode exhibits exponential behavior. Introducing a small, time-varying signal on top of this bias aids in examining...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
Diode: Forward bias01:20

Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
Diode: Reverse bias01:14

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...

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Updated: Jun 8, 2026

Characterization of Anisotropic Leaky Mode Modulators for Holovideo
09:36

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

Published on: March 19, 2016

Self-linearized analog differential self-electro-optic-effect device.

E A De Souza, L Carraresi, G D Boyd

    Applied Optics
    |September 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel self-electro-optic-effect device for analog signal processing. The device offers a linear output proportional to input, enabling bipolar processing for advanced image arrays.

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    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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    Published on: April 1, 2020

    Area of Science:

    • Optoelectronics
    • Photonics
    • Device Physics

    Background:

    • Analog signal processing is crucial for image processing arrays.
    • Existing devices may have limitations in dynamic range and processing capabilities.

    Purpose of the Study:

    • To describe, demonstrate, and characterize a novel analog self-electro-optic-effect device.
    • To enable bipolar processing in image processing arrays.

    Main Methods:

    • Characterization of a self-electro-optic-effect device.
    • Measurement of optical output power difference.
    • Analysis of device response to electrical and optical drives.

    Main Results:

    • The device exhibits a linear relationship between output power difference and input drive (electrical or optical).
    • Operates over a wide optical power range (50 nW to 2.5 mW).
    • Frequency response (3-dB limit) scales from 7 kHz to 3.5 MHz with absorbed power.

    Conclusions:

    • The developed device facilitates bipolar processing for novel image processing arrays.
    • Demonstrates a wide dynamic range and tunable frequency response.
    • Presents a promising component for advanced optoelectronic systems.