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

Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

120
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...
120
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

68
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
68
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

1.5K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.5K
Errors in Global Positioning System01:26

Errors in Global Positioning System

76
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
76
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

3.5K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.5K
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

112
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
112

You might also read

Related Articles

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

Sort by
Same author

Tirzepatide for Obesity in Adults ≥ 65 Years: A Post Hoc Analysis of the SURMOUNT and SUMMIT Clinical Trials.

Diabetes, obesity & metabolism·2026
Same author

Random structured spiral beams with spatially varying coherence and their optical radiation forces.

Optics express·2026
Same author

Orforglipron compared with dapagliflozin in adults with type 2 diabetes and inadequate glycaemic control with metformin (ACHIEVE-2): a multicentre, randomised, non-inferiority, open-label, phase 3 trial.

Lancet (London, England)·2026
Same author

Machine learning model-guided selective use of temporary diverting ileostomy in rectal cancer surgery: a randomized controlled trial.

Nature communications·2026
Same author

Experimental synthesis of vector-twisted beams with controllable higher-order Poincaré polarization states.

Optics letters·2026
Same author

Autofocusing properties of partially coherent caustic beams.

Optics express·2026

Related Experiment Video

Updated: Jul 28, 2025

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

10.9K

High-precision clock date recovery for optical wireless communications using orbital-angular-momentum-based mode

Jianghao Li, Yangsheng Yuan, Yangjian Cai

    Optics Letters
    |June 1, 2023
    PubMed
    Summary

    This study demonstrates real-time optical wireless communications using orbital angular momentum multiplexing. Clock data recovery ensures precise channel synchronization, achieving high data rates and reliable performance for future OWC systems.

    More Related Videos

    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

    11.5K
    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    9.0K

    Related Experiment Videos

    Last Updated: Jul 28, 2025

    Quasi-light Storage for Optical Data Packets
    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    10.9K
    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

    11.5K
    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    9.0K

    Area of Science:

    • Optical Communications
    • Wireless Technology
    • Signal Processing

    Background:

    • Optical wireless communications (OWCs) offer high bandwidth potential.
    • Orbital angular momentum (OAM)-based mode division multiplexing (MDM) enhances OWC capacity.
    • Real-time synchronization is critical for high-speed OWC systems.

    Purpose of the Study:

    • To investigate the application of clock data recovery for real-time OWC systems.
    • To demonstrate the feasibility of OAM-based MDM in conjunction with clock data recovery.
    • To achieve high-precision time synchronization for multiplexed optical channels.

    Main Methods:

    • Experimental demonstration of a 3-mode multiplexed optical wireless link.
    • Implementation of modified digital feedback clock recovery utilizing the Gardner algorithm for time synchronization.
    • Performance evaluation based on data rate, timing error, and bit-error rate.

    Main Results:

    • A sum data rate of 60 Gbps was achieved in the 3-mode multiplexed link.
    • High-precision channel synchronization with minimal timing error was successfully realized.
    • Bit-error rates for all channels fell below the hard-decision forward error correction (HD-FEC) limit of 3.8 × 10-3.

    Conclusions:

    • Clock data recovery is a viable technique for implementing real-time OWC systems.
    • OAM-based MDM combined with effective clock recovery enables high-performance optical wireless links.
    • The proposed method ensures reliable data transmission below the HD-FEC threshold.