Fiber recirculating delay-line tunable depolarizer.

Area of Science:

• Optics and Photonics
• Fiber Optic Technology
• Coherent Light Systems

Background:

• Polarization fluctuations in fiber optic systems can degrade performance.
• Existing depolarization methods may have limitations with coherent light sources.

Purpose of the Study:

• To propose and demonstrate a new all-single-mode fiber depolarizer.
• To investigate its effectiveness in reducing the degree of polarization.
• To show its utility in mitigating polarization-induced noise in fiber-optic systems.

Main Methods:

• Design and theoretical analysis of a fiber depolarizer based on a 2x2 coupler and recirculating delay line.
• Experimental validation of the depolarizer's performance with a narrow-band laser source.
• Evaluation of polarization reduction and its impact on polarization-sensitive systems.

Main Results:

• The proposed fiber depolarizer successfully reduced the degree of polarization from 99.8% to 1.15%.
• Experimental results confirmed the theoretical model's predictions.
• The device effectively eliminated polarization fluctuation effects in a test system.

Conclusions:

• The developed fiber depolarizer is effective for coherent light sources.
• It offers a practical solution for mitigating polarization-related issues in fiber-optic applications.
• The design principles provide a basis for future optimization and implementation.