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  2. Group delay and phase delay - Wikipedia

    en.wikipedia.org/wiki/Group_delay_and_phase_delay

    The differential group delay is the difference in propagation time between the two eigenmodes X and Y polarizations. Consider two eigenmodes that are the 0° and 90° linear polarization states. If the state of polarization of the input signal is the linear state at 45° between the two eigenmodes, the input signal is divided equally into the ...

  3. Polarization mode dispersion - Wikipedia

    en.wikipedia.org/wiki/Polarization_mode_dispersion

    A PMD compensation system is a device which uses a polarization controller to compensate for PMD in fibers.Essentially, one splits the output of the fiber into two principal polarizations (usually those with dτ dω = 0, i.e. no first-order variation of time-delay with frequency), and applies a differential delay to re-synchronize them.

  4. Delay differential equation - Wikipedia

    en.wikipedia.org/wiki/Delay_differential_equation

    DDEs are also called time-delay systems, systems with aftereffect or dead-time, hereditary systems, equations with deviating argument, or differential-difference equations. They belong to the class of systems with the functional state , i.e. partial differential equations (PDEs) which are infinite dimensional, as opposed to ordinary ...

  5. Transfer function - Wikipedia

    en.wikipedia.org/wiki/Transfer_function

    The group delay (the frequency-dependent amount of delay introduced to the envelope of the sinusoid by the transfer function) is found by computing the derivative of the phase shift with respect to angular frequency , = ().

  6. Bessel filter - Wikipedia

    en.wikipedia.org/wiki/Bessel_filter

    A plot of the gain and group delay for a fourth-order low-pass Bessel filter. Note that the transition from the passband to the stopband is much slower than for other filters, but the group delay is practically constant in the passband. The Bessel filter maximizes the flatness of the group delay curve at zero frequency.

  7. How a GM layoff email sent to employees triggered a storm on ...

    www.aol.com/news/gm-layoff-email-sent-employees...

    He also served for 16 years as head of GM’s employee resource group for LGBTQ+ and allied employees. He started as an intern in 1984 and then joined GM full-time in 1986 as an analyst in ...

  8. Talk:Group delay and phase delay - Wikipedia

    en.wikipedia.org/wiki/Talk:Group_delay_and_phase...

    4) Group delay, as mentioned by others on this talk page is quite complicated in concept. For example, it cannot give any difinitive or quantifiable information outside the context of modulation and demodulation. And group delay cannot even give the time delay of the DUT frequency components.

  9. Why your favorite catalogs are smaller this holiday season

    www.aol.com/why-favorite-catalogs-smaller...

    The number of catalogs mailed each year dropped about 40% between 2006 to 2018, when an estimated 11.5 billion were mailed to homes, according to the trade group formerly known as the American ...