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

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

Basic Discrete Time Signals

Basic Discrete Time Signals

The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is the...

Sampling Continuous Time Signal

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...

Effective Value of a Periodic Waveform

Effective Value of a Periodic Waveform

The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
The effective value of a periodic current represents the direct current (DC) that conveys the same average power to a resistor as the periodic current itself. This concept is crucial when assessing AC circuits. To determine the...

Exponential and Sinusoidal Signals

Exponential and Sinusoidal Signals

The exponential function is crucial for characterizing waveforms that rise and decay rapidly. This continuous-time exponential function is defined using exponential terms with constants α and A. When both constants are real, the function is represented as,

Rectangular and Triangular Pulse Function

Rectangular and Triangular Pulse Function

The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,

You might also read

Related Articles

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

Sort by

Same author

Analyzing the complex dynamics of the temporal RMS width of noise-like pulses.

Applied optics·2026

Same author

Spectroscopic real-time monitoring of methane and acetylene using noise-like pulse ultrafast dynamics in supercontinuum generation.

Optics express·2026

Same author

Accessible interferometric autocorrelator for noise-like pulses based on a Fabry-Perot cavity.

Optics express·2023

Same author

Effect of graphite oxide electrochemically exfoliated over a multimode interference filter.

Applied optics·2023

Same author

Optical fiber pH sensor based on a multimode interference device with polymer overlay.

Applied optics·2023

Same author

All-POF coupling ratio-imbalanced Sagnac interferometer as a refractive index sensor.

Applied optics·2021

Search research articles

Related Experiment Video

Updated: Dec 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Generation, characterization, and experimental analysis of noise-like pulse envelopes with complex shapes.

M A González-Galicia, O Pottiez, V I Ruiz-Pérez

|August 14, 2020

Summary

Researchers generated 41 complex noise-like pulse (NLP) shapes using an erbium-doped fiber laser. Polarization control within the nonlinear optical loop mirror enabled precise tuning of these unique pulse envelopes.

More Related Videos

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Continuous Measurement of Biological Noise in Escherichia Coli Using Time-lapse Microscopy

Continuous Measurement of Biological Noise in Escherichia Coli Using Time-lapse Microscopy

Published on: April 27, 2021

Related Experiment Videos

Last Updated: Dec 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Continuous Measurement of Biological Noise in Escherichia Coli Using Time-lapse Microscopy

Continuous Measurement of Biological Noise in Escherichia Coli Using Time-lapse Microscopy

Published on: April 27, 2021

Area of Science:

Nonlinear optics
Fiber laser technology
Pulse shaping

Background:

Passively mode-locked fiber lasers are crucial for generating ultrashort pulses.
Controlling pulse characteristics is essential for various optical applications.
Nonlinear optical loop mirrors (NOLMs) offer a mechanism for pulse manipulation.

Purpose of the Study:

To generate and characterize complex noise-like pulse (NLP) envelopes with diverse shapes.
To investigate the influence of polarization state on NLP generation.
To evaluate the performance of the NOLM theoretical model against experimental data.

Main Methods:

Utilized a passively mode-locked, erbium-doped figure-eight fiber laser (EDFEFL).
Employed a quarter-wave retarder (QWR2) within a NOLM to tune pulse shapes by adjusting polarization.
Performed single-shot temporal and spectral characterization of generated NLPs.

Main Results:

Successfully generated 41 distinct complex NLP envelopes at 1560 nm.
Demonstrated precise control over temporal amplitude, FWHM, and RMS width via polarization tuning.
Analyzed pulse splitting into subpackets and corresponding spectral profiles.
Validated the NOLM theoretical model with experimental findings.

Conclusions:

Polarization control within a NOLM is an effective method for generating complex NLP shapes in fiber lasers.
The study provides a comprehensive characterization of dynamically tunable complex pulse envelopes.
Experimental results align well with the theoretical NOLM model, confirming its predictive capability.