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Updated: Jun 10, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Polarization demultiplexing in Stokes space.

Bogdan Szafraniec¹, Bernd Nebendahl, Todd Marshall

¹Agilent Technologies, Measurement Research Laboratory, 5301 Stevens Creek Blvd., Santa Clara, CA 95051, USA. Bogdan_Szafraniec@Agilent.com

|August 20, 2010

Summary

A novel polarization demultiplexing technique analyzes signals in Stokes space, independent of modulation format. This method identifies polarization states and transformation matrices without demodulation, offering a versatile solution for optical communications.

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Area of Science:

Optical Communications
Signal Processing
Polarization Optics

Background:

Polarization multiplexing is crucial for increasing data capacity in optical fiber systems.
Existing polarization demultiplexing techniques often require modulation format-specific algorithms or complex demodulation steps.

Purpose of the Study:

To demonstrate a modulation format-independent technique for polarization demultiplexing.
To utilize Stokes space analysis for identifying polarization states and transformation matrices.

Main Methods:

The technique relies on observing signal samples in Stokes space.
It involves finding the best-fit plane and its normal passing through the origin in Stokes space.
This normal vector directly yields the polarization states and the required transformation matrix.

Main Results:

Experimental verification confirms the technique's effectiveness.
The method successfully identifies orthogonal polarization states and the polarization alignment transformation matrix.
Performance is comparable to established methods like the constant modulus algorithm.

Conclusions:

A robust and versatile polarization demultiplexing technique is presented.
The Stokes space analysis approach eliminates the need for demodulation and modulation format dependence.
This method offers a simplified and broadly applicable solution for advanced optical signal processing.