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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...
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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.
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Phase Changes

Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

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Published on: March 20, 2017

Performance analysis of phase-code multiplexed holographic memory.

K T Kim1, B C Cho, E S Kim

  • 1National Research Laboratory of Three-Dimensional Imaging and Display, School of Electronic Engineering, Kwangwoon University, 447-1 Wolge-Dong, Nowon-Gu, Seoul 139-701, Korea. eskim@daisy.kwangwoon.ac.kr

Applied Optics
|March 20, 2008
PubMed
Summary
This summary is machine-generated.

This study analyzes phase codes for holographic memory, finding pseudorandom codes (PSR) offer the highest signal-to-noise ratio (SNR) and minimal data degradation, even with phase errors.

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Area of Science:

  • Optics and Photonics
  • Information Storage
  • Computer Science

Background:

  • Holographic memory systems utilize phase-code multiplexing for data storage.
  • Spatial light modulators introduce nonlinear phase modulation and potential phase errors.
  • Effective phase codes are crucial for high-fidelity data retrieval.

Purpose of the Study:

  • To analyze the effectiveness of four phase codes in holographic memory systems.
  • To evaluate the impact of phase errors on data retrieval quality.
  • To identify the optimal phase code for robust holographic data storage.

Main Methods:

  • Computer simulations were performed using a 32x32 pixel address beam.
  • Phase errors (0-25%) were introduced to simulate practical spatial light modulator characteristics.
  • Autocorrelation and cross-correlation analyses were used to compare phase codes.

Main Results:

  • Pseudorandom codes (PSR) exhibited the lowest mean cross-correlation value (0.067).
  • PSR demonstrated a higher signal-to-noise ratio (SNR) compared to other codes.
  • PSR showed the lowest standard deviation (0.0113), indicating minimal data degradation.

Conclusions:

  • Pseudorandom codes are highly effective for phase-code multiplexing in holographic memory.
  • PSR offers superior performance in terms of SNR and data integrity, even under phase errors.
  • The findings support the use of PSR for advanced holographic data storage applications.