Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lag Control

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...

You might also read

Related Articles

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

Sort by

Same author

FMCW LiDAR with a GaN-based distributed feedback laser diode at 466 nm.

Optics express·2026

Same author

Waveform measurement technique for phase/frequency-modulated lights based on self-heterodyne interferometry.

Optics express·2017

Same author

Characterization of optical resonators with an incoherent light.

Optics express·2013

Same author

Limitation and improvement in the performance of recirculating delayed self-heterodyne method for high-resolution laser lineshape measurement.

Optics express·2012

Same author

Laser frequency modulation noise measurement by recirculating delayed self-heterodyne method.

Optics letters·2011

Same author

Titanium-based transition-edge photon number resolving detector with 98% detection efficiency with index-matched small-gap fiber coupling.

Optics express·2011

Search research articles

Related Experiment Video

Updated: Jun 8, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Time division vector optical sampling for ultrafast amplitude/phase modulation device characterization.

Hidemi Tsuchida¹

¹National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba 305-8568, Japan. h‑tsuchida@aist.go.jp

|October 5, 2010

Summary

This summary is machine-generated.

This study introduces a novel optical signal measurement technique using homodyne detection and nonlinear optical sampling. The method accurately captures ultrafast responses in semiconductor optical amplifiers.

More Related Videos

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Related Experiment Videos

Last Updated: Jun 8, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Area of Science:

Optoelectronics
Nonlinear Optics
Signal Processing

Background:

Accurate measurement of optical signal waveforms is crucial for understanding ultrafast phenomena.
Existing techniques may face limitations in resolution or complexity for certain applications.

Purpose of the Study:

To propose and demonstrate a new technique for measuring optical signal waveforms.
To evaluate the ultrafast response of semiconductor optical amplifiers using this method.

Main Methods:

Utilizes homodyne in-phase and quadrature detection.
Employs nonlinear optical sampling with a phase-modulated local oscillator.
Applies time division sampling of electric field components.

Main Results:

Successfully demonstrated the proposed technique for optical signal waveform measurement.
Applied the technique to evaluate the ultrafast response of a semiconductor optical amplifier.

Conclusions:

The developed technique offers a viable approach for characterizing ultrafast optical phenomena.
This method provides valuable insights into the dynamic behavior of semiconductor optical amplifiers.