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Related Concept Videos

What is a Frequency Distribution00:51

What is a Frequency Distribution

26.9K
A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
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Mean From a Frequency Distribution01:11

Mean From a Frequency Distribution

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Sometimes, data gathered from an experiment on a large sample or population are organized into concise tables. In such cases, the frequency of the quantitative data set is plotted in the form of a table. Or else, the data values are grouped into the quantity’s intervals, which form classes, and their respective frequencies are known. That is, the data values are distributed over different categories or classes. This is known as frequency distribution.
When such a data set is encountered,...
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Construction of Frequency Distribution01:15

Construction of Frequency Distribution

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A frequency distribution table can be constructed using the steps given below.
First, make a table with two columns—one with the title of the data that needs to be organized, and the other column for frequency. [Draw a third column for tally marks if needed]. Then, take a look at the items given in the data set and decide if an ungrouped frequency distribution table or a grouped frequency distribution table would be more suitable. If there are large sets of different values, then it is...
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Percentage Frequency Distribution00:57

Percentage Frequency Distribution

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A percentage frequency distribution, in general, is a display of data that indicates the percentage of observations for each data point or grouping of data points. It is a commonly used method for expressing the relative frequency of survey responses and other data. The percentage frequency distributions are often displayed as bar graphs, pie charts, or tables.
The process of making a percentage frequency distribution involves the following few steps: note the total number of observations;...
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Relative Frequency Distribution00:55

Relative Frequency Distribution

13.2K
A relative frequency distribution is the proportion or fraction of times a value occurs in a data set. To find the relative frequencies, one can divide each frequency by the total number of data points in the sample. It is very similar to a regular frequency distribution, except that instead of reporting how many data values fall in a class, a relative frequency distribution reports the fraction of data values that fall in a class. These fractions or proportions are called relative frequencies...
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Cumulative Frequency Distribution01:04

Cumulative Frequency Distribution

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A cumulative frequency distribution is another type of frequency distribution. Instead of reporting how many data values fall in some classes, it reports how many data values are contained in either that class or any class to its left. Technically, it means the sum of frequencies of the class and all the classes below it in a frequency distribution. A cumulative frequency is calculated by adding the frequency of each class lower than the corresponding class interval or category. In general, a...
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Simple frequency-tunable optoelectronic oscillator using integrated multi-section distributed feedback semiconductor

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    Summary
    This summary is machine-generated.

    A new optoelectronic oscillator (OEO) uses an integrated multi-section distributed feedback laser for a simpler, more flexible design. This novel approach significantly improves phase noise and sidemode suppression ratio for advanced signal generation.

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    Area of Science:

    • Photonics and Optoelectronics
    • Integrated Optics
    • Microwave Photonics

    Background:

    • Optoelectronic oscillators (OEOs) are crucial for high-performance signal generation.
    • Traditional OEOs often involve complex structures with discrete components, limiting integration and flexibility.
    • Integrated multi-section distributed feedback (IMS-DFB) lasers offer potential for compact and stable light sources.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel OEO architecture.
    • To leverage an IMS-DFB laser for simplified OEO design.
    • To achieve improved phase noise and sidemode suppression ratio through integration.

    Main Methods:

    • Direct modulation of an IMS-DFB laser.
    • Incorporation of a built-in microwave photonic filter (MPF).
    • Mutual injection locking of two DFB sections fabricated using the Reconstruction Equivalent Chirp (REC) technique.
    • Utilizing dual fiber loops (13 km and 5.4 km) for phase noise enhancement.

    Main Results:

    • Successful demonstration of the proposed OEO scheme.
    • Achieved single-sideband (SSB) phase noise of -115.3 dBc/Hz at 10 kHz offset and -92.9 dBc/Hz at 1 kHz offset for a 20.3 GHz signal.
    • Obtained a sidemode suppression ratio (SMSR) of 60.94 dB, a 40 dB improvement over single-loop configurations.
    • Demonstrated an 8 dB phase noise improvement at a 1 kHz offset using dual fiber loops.

    Conclusions:

    • The proposed IMS-DFB laser-based OEO offers a simpler and more flexible alternative to conventional designs.
    • The integrated approach overcomes limitations of discrete lasers and external modulators.
    • This compact OEO with high wavelength control accuracy is a promising development for integrated photonic systems.