High resolution optical frequency domain reflectometry for characterization of components and assemblies.

Area of Science:

• Optics and Photonics
• Metrology
• Materials Science

Background:

• Optical frequency domain reflectometry (OFDR) is a powerful technique for characterizing optical components.
• High spatial resolution and sensitivity are crucial for advanced optical metrology.
• Understanding light polarization changes is essential for analyzing birefringent materials.

Purpose of the Study:

• To introduce a novel polarization-sensitive OFDR technique.
• To demonstrate high spatial resolution and sensitivity in OFDR measurements.
• To showcase the system's capability in analyzing polarization states.

Main Methods:

• Implementing a polarization-sensitive OFDR system.
• Achieving 22 micrometer two-point spatial resolution over 35 meters.
• Utilizing a polarization diversity receiver for polarization tracking.

Main Results:

• The technique achieves 22 micrometer spatial resolution over 35 meters with -97 dB sensitivity.
• Measurements are completed in seconds, demonstrating high efficiency.
• The system successfully analyzed a fiber Bragg grating (FBG) in both spectral and impulse domains.
• Changes in polarization state through a birefringent component were tracked.

Conclusions:

• The developed polarization-sensitive OFDR technique offers significant advancements in spatial resolution and sensitivity.
• The system's versatility is demonstrated through time- and frequency-domain metrology.
• The use of a polarization diversity receiver enables effective tracking of polarization state changes.