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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

Polarization-maintaining fiber-optic-grating vector vibroscope.

Tuan Guo¹, Libin Shang, Fu Liu

¹Institute of Photonics Technology, Jinan University, Guangzhou 510632, China. tuanguo@jnu.edu.cn

|March 5, 2013

Summary

This summary is machine-generated.

This study introduces a compact fiber-optic vector vibroscope. It precisely measures vibration orientation and amplitude using orthogonal polarization cladding modes, unaffected by temperature.

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Area of Science:

Optoelectronics and Photonics
Fiber Optic Sensing
Vibration Measurement

Background:

Accurate vibration measurement is crucial in various engineering applications.
Existing fiber optic sensors often face limitations in vector measurement and environmental stability.
Cladding mode recoupling offers a potential pathway for enhanced sensitivity and selectivity.

Purpose of the Study:

To demonstrate a novel fiber-optic vector vibroscope.
To achieve unambiguous measurement of vibration orientation and amplitude.
To develop a sensor robust against temperature fluctuations and power variations.

Main Methods:

A compact sensor head utilizing a polarization-maintained (PM) fiber Bragg grating (FBG) spliced to single-mode fiber.
Exploiting orthogonal polarization cladding-to-core recoupling of specific modes (LP(1,12) and LP(1,13)).
Dual-path power detection for analyzing recoupled mode intensities and referencing core mode (LP(0,1)) power.

Main Results:

Demonstrated high sensitivity of recoupled cladding mode intensity to bending in orthogonal directions.
Successfully determined both orientation and amplitude of vibrations unambiguously.
Sensor response showed independence from temperature changes and resilience to power fluctuations.

Conclusions:

The developed fiber-optic vector vibroscope offers a compact and robust solution for vibration analysis.
Orthogonal polarization cladding-to-core recoupling is an effective mechanism for vector vibration sensing.
The sensor's immunity to temperature and power variations enhances its practical applicability.