Aberration losses of the microoptic directional coupler

Area of Science:

• Optics and Photonics
• Optical Communication Systems

Background:

• Microoptic directional couplers are crucial components in modern optical communication.
• Aberration losses can significantly impact the performance of these devices.

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 yields lower loss than the paraxial length, even with reduced positional tolerance.
• Increased loss due to positional misalignment at the optimum length is less than the minimum loss at the paraxial length.

Conclusions:

• The paraxial length is not optimal for minimizing insertion loss in microoptic directional couplers.
• An optimized length provides superior performance, though requiring more precise fiber alignment.
• Theoretical findings align with experimental observations, validating the analysis.