Evaluation of polarization mode dispersion in a telecommunication wavelength selective switch using quantum...

Area of Science:

• Quantum Metrology
• Optical Communications
• Photonics

Background:

• Polarization mode dispersion (PMD) significantly impacts optical communication systems.
• Accurate PMD measurement is crucial for maintaining signal integrity in telecommunication networks.
• Existing PMD measurement techniques may lack the resolution required for advanced devices.

Purpose of the Study:

• To present a novel method for measuring polarization mode dispersion (PMD) in commercial telecommunication wavelength selective switches (WSS).
• To demonstrate the application of quantum interferometric techniques using polarization-entangled states for metrology.
• To explore the feasibility of quantum metrology in industrial, commercial devices.

Main Methods:

• Utilized a quantum interferometric technique employing polarization-entangled photon states.
• Generated polarization-entangled photons with a broad spectral width across the telecom band.
• Employed a chirped periodically poled nonlinear crystal for photon generation.

Main Results:

• Successfully performed a polarization mode dispersion (PMD) measurement on a commercial wavelength selective switch (WSS).
• Demonstrated the generation of broadband polarization-entangled photons suitable for telecom applications.
• Achieved high-resolution quantum interference, validating the technique's precision.

Conclusions:

• The quantum interferometric technique is effective for PMD measurement in commercial WSS devices.
• This study represents the first quantum metrology application using an industrial commercial device.
• The findings indicate a promising future for practical, high-resolution quantum interference in telecommunications.