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An optical DPSK demodulator is a device that provides a method for converting an optical differential phase-shift keying (DPSK) signal to an intensity-keyed signal at the receiving end in fiber-optic communication networks. It is also known as delay line interferometer (DLI), or simply called DPSK demodulator.
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-coherent' scheme, i.e. there is no need for the demodulator to keep track of a reference wave.
They convert a phase-keyed signal into an amplitude-keyed signal. In this application, an incoming differential phase-shift keying (DPSK) optical signal is first split into two equal-intensity beams in two arms of a Mach Zehnder or Michelson interferometer, in which one beam is delayed by an optical path difference corresponding to 1-bit time ...
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On October 8, 2018, Facebook, Inc. announced the sale and shipment of the 10.1-inch (25.7 cm) Portal and the 15.6-inch (39.6 cm) Portal Plus. [9] [10] The second generation of Portal devices was announced on September 18, 2019; the second-generation Portal and Portal Mini were released on October 15, while Portal TV was released on November 5.
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