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Directional Relays

Directional Relays

Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Optical directional couplers with variable spacing.

T Findakly, C L Chen

|March 4, 2010

Summary

This summary is machine-generated.

New optical directional couplers with adjustable spacing are presented. This study offers solutions for designing variable spacing couplers for diverse applications.

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Area of Science:

Optics and Photonics
Waveguide Technology

Background:

Directional couplers are fundamental components in integrated optics.
Controlling the coupling coefficient is crucial for device performance.
Existing designs often lack adaptability in coupling strength.

Purpose of the Study:

To introduce and analyze novel optical directional couplers featuring variable separation.
To provide analytical solutions for coupled-mode equations with a variable coupling coefficient.
To develop a design procedure for optimizing variable spacing coupler geometry.

Main Methods:

Development of analytical models for optical directional couplers with variable separation.
Derivation of closed-form solutions for coupled-mode equations.
Formulation of a geometric design procedure for variable spacing couplers.

Main Results:

Successful introduction and analysis of optical directional couplers with variable separation.
Presentation of closed-form solutions applicable to variable coupling coefficients.
Establishment of a design procedure for optimizing coupler geometry across various applications.

Conclusions:

Variable separation optical directional couplers offer enhanced design flexibility.
The presented analytical solutions and design procedures facilitate practical implementation.
This work advances the development of adaptable optical coupling devices.