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Open-loop polarization mode dispersion mitigation for fibre-optic time and frequency transfer.

|February 25, 2022

Summary

Polarization mode dispersion (PMD) in optical fibers complicates time transfer. This study introduces a passive method using alternating polarized pulses and a Faraday mirror to reduce PMD noise by over 100 times.

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Area of Science:

Optical Physics
Fiber Optics Communications
Metrology

Background:

Polarization mode dispersion (PMD) in optical fibers introduces noise.
This non-reciprocal and dynamic effect hinders precise time and frequency transfer applications.

Purpose of the Study:

To present a simple, passive method for mitigating PMD effects.
To enable stable optical phase detection and fiber phase compensation for improved time/frequency transfer.

Main Methods:

Transmitting optical pulses with alternating orthogonal polarization.
Utilizing a Faraday mirror at the receiver for pulse polarization restoration.
Employing a mode-locked laser and pulse interleaver in an open-loop setup.

Main Results:

PMD noise is effectively shifted away from critical frequencies.
Stable optical phase detection and fiber phase compensation are facilitated.
A reduction in polarization mode dispersion by over two orders of magnitude was demonstrated.

Conclusions:

The proposed passive solution significantly reduces PMD.
This method enhances the accuracy of time and frequency transfer over optical fibers.