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

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Published on: February 28, 2016

A Terahertz (THz) Single-Polarization-Single-Mode (SPSM) Photonic Crystal Fiber (PCF).

Tianyu Yang¹, Can Ding², Richard W Ziolkowski¹

¹Global Big Data Technologies Centre (GBDTC), University of Technology Sydney (UTS), Ultimo, NSW 2007, Australia.

Materials (Basel, Switzerland)

|August 3, 2019

Summary

This study introduces a new single-polarization-single-mode photonic crystal fiber for terahertz applications. By strategically introducing epsilon-near-zero material and gain material, it achieves high performance with a short fiber length.

Keywords:

epsilon-near-zero (ENZ)fiber characterization photonic crystal fiber (PCF)single-polarization-single-mode (SPSM)terahertz (THz)

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

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Area of Science:

Photonics
Terahertz (THz) Technology
Materials Science

Background:

Photonic crystal fibers (PCFs) are crucial for advanced optical applications.
Achieving single-polarization-single-mode (SPSM) operation in the THz regime presents significant challenges.
Existing THz PCF designs often struggle with high loss and limited bandwidth.

Purpose of the Study:

To design and demonstrate a novel PCF for SPSM operation in the THz frequency range.
To achieve high polarization extinction ratios and low loss for the desired mode.
To enhance the performance of THz PCFs through material engineering and structural asymmetry.

Main Methods:

Modification of a circular hole PCF design by introducing asymmetry in the first ring of air holes.
Incorporation of epsilon-near-zero (ENZ) material into specific air holes to induce differential mode loss.
Introduction of gain material into the PCF core to enhance loss differences and compensate for modal loss.

Main Results:

The proposed PCF design effectively separates the fundamental X-polarized (XP) and Y-polarized (YP) modes due to asymmetric ENZ material placement.
The YP mode experiences significantly higher loss due to its greater field overlap with the lossy ENZ material.
An optimized PCF achieved loss differences (LDs) greater than 8.0 dB/cm between the XP mode and all other modes over a wide frequency range (0.312 THz).
The PCF demonstrated SPSM operation with a length of only 2.5 cm, suppressing unwanted modes by over 20 dB.

Conclusions:

The novel PCF design successfully achieves single-polarization-single-mode operation in the THz regime.
The strategic use of ENZ and gain materials provides a viable method for controlling mode properties and enhancing performance.
This work offers a promising solution for developing high-performance THz photonic devices.