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Related Concept Videos

Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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.
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
Methods of Medium Optimization01:28

Methods of Medium Optimization

Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...

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Related Experiment Video

Updated: Jul 6, 2026

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

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Design of efficient all-optical code-division multiplexing systems supporting multiple-bit-rate and equal-bit-rate

J G Zhang, G Picchi, A B Sharma

    Applied Optics
    |March 18, 2008
    PubMed
    Summary

    We developed efficient all-optical code-division multiplexing (AOCDM) systems using novel strict optical orthogonal codes (OOCs). These systems support multiple bit-rate data transmission without performance loss, offering enhanced bandwidth efficiency for MBR data.

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    Quasi-light Storage for Optical Data Packets
    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

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    Last Updated: Jul 6, 2026

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

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    Quasi-light Storage for Optical Data Packets
    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    Area of Science:

    • Optical communication systems
    • Signal processing
    • Information theory

    Background:

    • All-optical code-division multiplexing (AOCDM) systems enable high-capacity optical data transmission.
    • Conventional optical orthogonal codes (OOCs) have limitations in supporting multiple bit-rate (MBR) data transmission efficiently.
    • Existing AOCDM systems often face challenges with system complexity and bandwidth utilization.

    Purpose of the Study:

    • To design efficient AOCDM systems capable of transmitting multiple bit-rate (MBR) data signals over a single optical fiber.
    • To introduce and analyze novel strict optical orthogonal codes (OOCs) with improved autocorrelation and cross-correlation properties.
    • To demonstrate the feasibility of low-cost AOCDM transmitters using a gain-switching scheme.

    Main Methods:

    • Design of strict OOCs utilizing the concept of slot distances.
    • Development of code construction methods for the proposed strict OOCs.
    • Analysis of MBR and equal-bit-rate (EBR) data transmission principles in AOCDM systems.
    • Design of AOCDM transmitters based on efficient gain-switching schemes without electro-optic modulators.

    Main Results:

    • The proposed strict OOCs enable AOCDM systems to transmit multiuser MBR and EBR data without increased system complexity.
    • Optimal strict OOCs offer comparable or better system bandwidth and performance compared to conventional OOCs, especially for MBR transmissions.
    • A new family of strict OOCs with non-constant weights was introduced, supporting multiuser communications with varying transmission quality.
    • Experimental demonstration of the basic operation principle of the proposed AOCDM system and transmitters.

    Conclusions:

    • The developed strict OOCs provide an efficient solution for MBR data transmission in AOCDM systems.
    • The proposed AOCDM system design offers enhanced bandwidth efficiency and performance, particularly for MBR applications.
    • Low-cost AOCDM transmitters can be realized using efficient gain-switching techniques, reducing system complexity and cost.