Monitoring method for axis alignment of single-mode optical fiber and splice-loss estimation

Area of Science:

• Optoelectronics
• Materials Science
• Optical Engineering

Background:

• Accurate core-axis alignment is crucial for minimizing signal loss in single-mode optical fibers.
• Conventional alignment methods may not achieve the sub-micrometer precision required for ultra-low loss splices.
• Precise splice-loss estimation is essential for quality control and network performance.

Purpose of the Study:

• To introduce a new method for high-precision core-axis alignment of single-mode optical fibers.
• To develop a technique for accurate splice-loss estimation in low-loss regions.
• To demonstrate the performance improvement over conventional alignment methods.

Main Methods:

• Utilizing a differential interference contrast microscope for core-axis alignment.
• Employing a novel approach for splice-loss estimation without index-matching liquid.
• Comparing the new method's alignment offset and loss increase against conventional optical monitoring.

Main Results:

• Achieved core-axis alignment with an offset below 0.3 micrometers.
• Demonstrated a splice-loss increase of only 0.04 dB compared to conventional methods.
• Attained splice-loss estimation precision of 0.05 dB in low-loss regions.

Conclusions:

• The differential interference contrast microscopy method offers superior core-axis alignment precision for single-mode optical fibers.
• The proposed splice-loss estimation technique provides high accuracy without the need for index-matching liquid.
• This advancement contributes to improved performance and reliability in optical fiber communication systems.