Aberration losses of the microoptic directional coupler

Area of Science:

• Optical Engineering
• Telecommunications

Background:

• Microoptic directional couplers are crucial components in modern optical communication systems.
• Understanding and minimizing aberration losses are key to improving device performance.

Purpose of the Study:

• To theoretically analyze aberration losses in microoptic directional couplers.
• To determine the optimal operating length for minimizing insertion loss.

Main Methods:

• Theoretical analysis of aberration losses.
• Comparison with experimental results.

Main Results:

• Minimum insertion loss occurs at an optimum coupler length, shorter than the paraxial length.
• The optimum length shows reduced tolerance for output fiber positioning.
• Despite reduced tolerance, losses due to positional misalignment at the optimum length are less than minimum losses at the paraxial length.

Conclusions:

• The paraxial length is not optimal for minimizing insertion loss in microoptic directional couplers.
• An optimized length offers superior performance, even with tighter alignment tolerances.
• Theoretical findings align with experimental observations, validating the analysis.