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  2. Group delay and phase delay - Wikipedia

    en.wikipedia.org/wiki/Group_delay_and_phase_delay

    The group delay and phase delay properties of a linear time-invariant (LTI) system are functions of frequency, giving the time from when a frequency component of a time varying physical quantity—for example a voltage signal—appears at the LTI system input, to the time when a copy of that same frequency component—perhaps of a different physical phenomenon—appears at the LTI system output.

  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. 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.

  5. Polarization rotator - Wikipedia

    en.wikipedia.org/wiki/Polarization_rotator

    Furthermore, MO switches have also been successfully adopted to generate differential group delay for PMD compensation and PMD emulation applications. Prism rotators [ edit ]

  6. Lattice delay network - Wikipedia

    en.wikipedia.org/wiki/Lattice_delay_network

    An ideal delay line characteristic has constant attenuation and linear phase variation, with frequency, i.e. it can be expressed by =where τ is the required delay.. As shown in lattice networks, the series arms of the lattice, za, are given by

  7. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    Group delay largely frequency-dependent; Here is an image showing the gain of a discrete-time Butterworth filter next to other common filter types. All of these filters are fifth-order. The Butterworth filter rolls off more slowly around the cutoff frequency than the Chebyshev filter or the Elliptic filter, but without ripple.

  8. Phase-shift keying - Wikipedia

    en.wikipedia.org/wiki/Phase-shift_keying

    Alternatively, the phase shift of each symbol sent can be measured with respect to the phase of the previous symbol sent. Because the symbols are encoded in the difference in phase between successive samples, this is called differential phase-shift keying (DPSK). DPSK can be significantly simpler to implement than ordinary PSK, as it is a 'non ...

  9. Schmitt trigger - Wikipedia

    en.wikipedia.org/wiki/Schmitt_trigger

    Whereas the photodiode is prone to spurious switching due to noise from the environment, the delay added by the filter and Schmitt trigger ensures that the output only switches when there is certainly an input stimulating the device. Schmitt triggers are common in many switching circuits for similar reasons (e.g., for switch debouncing).

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