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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.
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Related Experiment Video

Updated: May 31, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Mode multiplexer for multimode transmission in multimode fibers.

Chin-ping Yu1, Jia-hong Liou, Yi-jen Chiu

  • 1Department of Photonics, Institute of Electro-optical Engineering, and Advanced Crystal Opto-electronic Research Center, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, Taiwan. cpyu@faculty.nsysu.edu.tw

Optics Express
|July 1, 2011
PubMed
Summary
This summary is machine-generated.

This study demonstrates an efficient mode multiplexer for optical communications. The device uses single-mode fibers to excite two modes in multimode fibers, enabling two communication channels with minimal interference.

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Area of Science:

  • Optoelectronics
  • Optical Communications
  • Fiber Optics

Background:

  • Mode multiplexing is crucial for increasing data capacity in optical fibers.
  • Existing methods often suffer from modal interference, limiting performance.
  • Efficiently exciting and controlling higher-order modes is a key challenge.

Purpose of the Study:

  • To numerically demonstrate an efficient mode multiplexer.
  • To enable simultaneous excitation of two orthogonal higher-order modes in multimode fibers (MMFs).
  • To achieve low modal interference for enhanced optical communication channels.

Main Methods:

  • Numerical simulation of a mode multiplexer.
  • Utilizing a phase controller and a mode coupler composed of four single-mode fibers (SMFs).
  • Connecting the mode multiplexer to an MMF to excite higher-order modes.

Main Results:

  • Successful demonstration of an efficient mode multiplexer.
  • Simultaneous excitation of two orthogonal higher-order modes in MMF achieved.
  • Very low modal interference between the two excited modes was observed.
  • Analysis of the impact of SMF distance and size in the mode coupler on performance.

Conclusions:

  • The proposed mode multiplexer is effective for creating dual-channel optical communication.
  • Low modal interference is achievable, enhancing signal integrity.
  • The design parameters of the mode coupler (distance and size) significantly influence the multiplexer's performance.