Delay line interferometer

Delay line interferometer

A delay line interferometer (DLI) can be a Mach-Zehnder interferometer or Michelson interferometer based on two-beam interference, in which one beam is time-delayed to the other by a desired interval.

Delay line interferometers are also known as optical DPSK demodulators. 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 delay. After recombination, the two beams interfere with each other constructively or destructively. The resultant interference intensity is the intensity-keyed signal.

External links


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Michelson interferometer — A Michelson interferometer for use on an optical table. The Michelson interferometer is the most common configuration for optical interferometry and was invented by Albert Abraham Michelson. An interference pattern is produced by splitting a beam …   Wikipedia

  • Navy Prototype Optical Interferometer — (NPOI) Layout The Navy Prototype Optical Interferometer (NPOI[1] note recently the Protoype was dropped so that the facility is now called NOI ), is an astronomical interferometer [2] operated by the United States Naval …   Wikipedia

  • Optical DPSK demodulator — 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… …   Wikipedia

  • Phase-shift keying — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • Microphotonics — is a branch of technology that deals with directing light on a microscopic scale. It is used in optical networking. Microphotonics employs at least two different materials with a large differential index of refraction to squeeze the light down to …   Wikipedia

  • Photonics — Refraction of waves of photons (light) by a prism The science of photonics[1] includes the generation, emission, transmission, modulation, signal processing, switching …   Wikipedia

  • DLI — is a three letter abbreviation that may refer to: Defense Language Institute, an agency of the United States Department of Defense Department of Labor and Industry, an administrative unit common to many individual state governments in the United… …   Wikipedia

  • Nanophotonics — Part of a series of articles on Nanoelectronics Single molecule electronics …   Wikipedia

  • Very Large Telescope — VLT redirects here. For other uses, see VLT (disambiguation). Very Large Telescope The four Unit Telescopes that form the VLT together with th …   Wikipedia

  • Optical autocorrelation — Classification of the different kinds of optical autocorrelation. In optics, various autocorrelation functions can be experimentally realized. The field autocorrelation may be used to calculate the spectrum of a source of light, while the… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”