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Switching of BJT

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...

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Mirror-type optical switch array.

H Naitoh, S Noda, K Muto

|March 9, 2010

Summary

This summary is machine-generated.

This study demonstrates a novel optical switch array on a lithium niobate substrate. The integrated device efficiently routes optical signals using electrical control, showcasing its potential for advanced photonic applications.

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Area of Science:

Photonics
Materials Science
Electrical Engineering

Background:

Integrated photonics leverages optical phenomena for signal processing.
Lithium niobate (LiNbO3) is a key material for electro-optic devices due to its excellent properties.

Purpose of the Study:

To design and fabricate a novel optical switch array.
To demonstrate the electrical control and signal routing capabilities of the integrated device.

Main Methods:

Integration of two optical switches onto a single LiNbO3 substrate.
Connection of switches via a thin-film waveguide for cascaded operation.
Application of electrical fields to control optical signal routing.

Main Results:

Demonstrated signal switching with relative outputs of 1.92, 0.05, and 0.01 without electrical field.
Achieved output redistribution to 0.02, 1.80, and 0.05 with electrical field on the first switch.
Observed output switching to 0.01, 0.01, and 1.80 when both switches were activated.

Conclusions:

The integrated optical switch array on LiNbO3 offers effective electrical control over signal routing.
The cascaded switch design enables complex optical signal manipulation.
This technology holds promise for applications in optical communication and computing.