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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Published on: December 3, 2013

Intermodal Four-Wave Mixing Process in Strain-Induced Birefringent Multimode Optical Fibers.

Michał Kwaśny¹, Paweł Mergo², Marek Napierała³

¹Faculty of Physics, Warsaw University of Technology, 75 Koszykowa, 00-662 Warsaw, Poland.

Materials (Basel, Switzerland)

|August 26, 2022

Summary

This summary is machine-generated.

This study explores intermodal four-wave mixing in strained optical fibers, finding that birefringence significantly impacts nonlinear frequency conversion and modal profiles, achieving over 30% efficiency.

Keywords:

four-wave mixing nonlinear frequency conversion strain-induced birefringence

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Last Updated: Jun 28, 2026

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Area of Science:

Nonlinear Optics
Optical Fiber Communications
Condensed Matter Physics

Background:

Intermodal four-wave mixing (IM-FWM) is a key nonlinear process in multimode optical fibers.
Strain-induced birefringence in optical fibers can alter light propagation characteristics.
Understanding IM-FWM in birefringent fibers is crucial for advanced optical signal processing.

Purpose of the Study:

To investigate the partially degenerate IM-FWM process in nonlinear multimode optical fibers with strain-induced birefringence.
To analyze the dependence of nonlinear frequency conversion and output modal field profiles on the degree of birefringence.
To determine the optimal pump beam polarization for efficient IM-FWM.

Main Methods:

Experimental investigation of IM-FWM in optical fibers subjected to uniform diameter stress.
Analysis of the photoelastic effect causing birefringence due to fiber winding.
Characterization of nonlinear frequency conversion efficiency and modal field profiles for varying birefringence.
Evaluation of IM-FWM efficiency with different pump beam polarizations (532 nm sub-nanosecond pulses).

Main Results:

Birefringence significantly affects the order of excited moduli in different fiber sections.
Nonlinear frequency conversion and modal field profiles are dependent on the degree of birefringence.
Over 30% conversion efficiency was achieved for fiber lengths of tens of centimeters.
Specific pump beam polarizations were identified as most effective for the IM-FWM process.

Conclusions:

Strain-induced birefringence in multimode optical fibers plays a critical role in modulating IM-FWM.
The study demonstrates a high conversion efficiency for IM-FWM in short fiber lengths under specific conditions.
Findings provide valuable insights for designing and optimizing nonlinear optical devices utilizing IM-FWM.