Delay line interferometer

Example for the possible fiber optic implementation of a delay line interferometer. FS = Faraday mirror, 50/50 = optical coupler, ↑ ↓ = optical diodes (isolators) with an arrow in the forward direction.

The delay line interferometer (DLI) (German: line delay interferometer ) is an interferometer based on the principles of Mach-Zehnder or Michelson .

The basis of the DLI is the presence of a two-beam interference , whereby one beam is guided with a time delay to a second with the desired defined distance.

In practice, the DLI is used, among other things, as an optical DPSK converter. A phase-modulated signal is converted into an amplitude-modulated one .

The time-bin configuration is an extension of the delay line interferometer to the quantum mechanical level .

literature

C.-A. Bunge: high bit rate optical transmission systems . PDF accessed on August 3, 2018 (German)
Björnstjerne Zindler: Construction of fiber-based interferometers for quantum cryptography . PDF accessed on August 3, 2018 (German) (2.363 MB)

Individual evidence

↑ C.-A. Bunge: chapter receiver for phase-modulated signals. In: High bit rate optical transmission systems. Retrieved in August 2018 (German).
↑ Björnstjerne Zindler: Chapter 2.1 Modules of the Time-Bin configuration. In: Structure of fiber-based interferometers in quantum cryptography. Retrieved in August 2018 (German).

[1] C.-A. Bunge: chapter receiver for phase-modulated signals. In: High bit rate optical transmission systems. Retrieved in August 2018 (German).

[2] Björnstjerne Zindler: Chapter 2.1 Modules of the Time-Bin configuration. In: Structure of fiber-based interferometers in quantum cryptography. Retrieved in August 2018 (German).