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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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

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,...
Properties of Fourier Transform I01:21

Properties of Fourier Transform I

The application of Fourier Transform properties in radio broadcasting is multifaceted, enabling significant advancements in the way signals are transmitted and received. Key areas where these properties are utilized include simultaneous multi-channel transmission, audio clip speed adjustments, live broadcast delays for different time zones, audio frequency adjustments, and signal demodulation.
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Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the system's...

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Related Experiment Video

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Phase-controlled superimposed FBGs and their applications in spectral-phase en/decoding.

Jilin Zheng1, Rong Wang, Tao Pu

  • 1Photonics Information Technology Laboratory, Institute of Communication Engineering, PLA University of Science and Technology, Nanjing, China. zhengjilinjs@126.com

Optics Express
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

A new type of superimposed fiber Bragg gratings (SI-FBGs), called SI-sampled FBGs (SI-SFBGs), allows for precise phase control. This innovation enables advanced applications like spectral-phase encoding with the longest code-length achieved to date.

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Area of Science:

  • Photonics and Optical Engineering
  • Fiber Optic Sensors
  • Signal Processing

Background:

  • Superimposed Fiber Bragg Gratings (SI-FBGs) offer versatile optical filtering capabilities.
  • Precise control over the phase relationship between sub-gratings in SI-FBGs is crucial for advanced applications.
  • Existing methods for phase control can be complex and demanding.

Purpose of the Study:

  • To propose and demonstrate a novel method for phase control in superimposed fiber Bragg gratings (SI-FBGs) using a sampling technique.
  • To introduce SI-sampled FBGs (SI-SFBGs) as a platform for precise phase relationship modulation.
  • To explore the application of phase-controlled SI-SFBGs in spectral-phase en/decoding.

Main Methods:

  • Development of SI-sampled FBGs (SI-SFBGs) by modulating sampling periods to control inter-grating phase.
  • Fabrication of SI-SFBGs using a single uniform phase mask and a high-precision moving stage.
  • Experimental and simulation-based validation of phase control and spectral-phase en/decoding capabilities.

Main Results:

  • Successful demonstration of phase control in SI-SFBGs by adjusting sampling periods.
  • Experimental fabrication of the longest code-length (64-frequency bins) spectral-phase encoded (SPE) encoders based on FBGs.
  • Validation of SI-SFBGs for spectral-phase en/decoding, showing advantages over traditional methods.

Conclusions:

  • SI-sampled FBGs (SI-SFBGs) provide an effective and simpler approach to achieve phase control in superimposed fiber Bragg gratings.
  • The developed SI-SFBG technology enables unprecedented performance in spectral-phase encoding applications.
  • This advancement is expected to drive further sophisticated applications of SI-FBGs in optical signal processing.