Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Feedback control systems01:26

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Effects of feedback01:24

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
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.
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Neutron-Multiplicity Measurement in Muon Capture on Oxygen Nuclei in the Gadolinium-Loaded Super-Kamiokande Detector.

Physical review letters·2026
Same author

Advances in 0D quantum dots and hybrid nanoarchitectures for high-performance gas sensing devices.

Nanotechnology·2025
Same author

A Working Framework to Address Diversity, Equity, and Inclusion in Undergraduate Medical Education.

Medical science educator·2024
Same author

Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST.

Sensors (Basel, Switzerland)·2023
Same author

Development of a scintillator-based optical soft x-ray (OSXR) diagnostic system for KSTAR tokamak.

The Review of scientific instruments·2023
Same author

Development of a soft x-ray (SXR) array diagnostic system on versatile experiment spherical torus (VEST).

The Review of scientific instruments·2022

Related Experiment Video

Updated: Jun 10, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Nonlinear dynamics of semiconductor lasers with feedback and modulation.

J P Toomey1, D M Kane, M W Lee

  • 1MQ Photonics Research Center, Department of Physics and Engineering, Macquarie University, Sydney, NSW 2109, Australia. josh.toomey@mq.edu.au

Optics Express
|August 20, 2010
PubMed
Summary

This study analyzes semiconductor laser dynamics using optical feedback and modulation. New animation tools reveal complex behaviors, including fine RF spectrum structures and switching between periodic and chaotic states.

More Related Videos

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
09:46

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Related Experiment Videos

Last Updated: Jun 10, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
09:46

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Area of Science:

  • Nonlinear dynamics
  • Semiconductor laser physics
  • Optical engineering

Background:

  • Semiconductor lasers are crucial for modern optics and communications.
  • Understanding their nonlinear dynamics is essential for stable operation and advanced applications.
  • Previous studies often lacked detailed visualization of dynamic transitions.

Purpose of the Study:

  • To investigate the nonlinear dynamics of semiconductor lasers under optical feedback and current modulation.
  • To develop and utilize novel visualization tools for analyzing complex laser dynamics.
  • To identify new dynamic regimes and spectral features in modulated semiconductor lasers.

Main Methods:

  • Acquisition of multi-GHz-bandwidth output power time-series data.
  • Fast Fourier Transform (FFT) analysis to generate Radio Frequency (RF) spectra.
  • Development of animations to visualize spectral evolution with varying parameters.
  • Correlation dimension analysis for characterizing dynamical states.

Main Results:

  • Animations effectively reveal spectral changes with optical feedback, injection current, and modulation.
  • Observed fine structures in the RF spectrum at low optical feedback levels.
  • Identified non-stationary switching between periodic and chaotic dynamics.
  • Correlation dimension analysis confirmed periodic states but struggled with complex dynamics.

Conclusions:

  • The developed animation tool provides novel insights into semiconductor laser dynamics.
  • Complex spectral features and dynamic switching highlight the intricate behavior of these systems.
  • Standard complexity measures may be insufficient for fully characterizing all observed dynamical states.