Intermodal energy transfer in a tapered optical fiber: optimizing transmission

Area of Science:

• Physics
• Optical Engineering
• Materials Science

Background:

• Optical nanofibers are crucial for advanced photonic applications.
• Controlling light propagation during nanofiber fabrication is essential for high-performance devices.
• Understanding mode coupling during tapering is key to minimizing signal loss.

Purpose of the Study:

• To experimentally and theoretically investigate energy transfer between optical modes during nanofiber tapering.
• To optimize the nanofiber tapering process for maximum fundamental mode transmission.
• To quantify the adiabaticity condition and establish practical limits for tapering angles.

Main Methods:

• Spectrogram analysis to study energy transfer between modes.
• Experimental fabrication and characterization of tapered optical nanofibers.
• Theoretical calculations to quantify adiabaticity and energy transfer.

Main Results:

• Achieved transmission exceeding 99.95% for the fundamental mode.
• Quantified the energy transfer between modes during the tapering process.
• Established an upper bound for energy transfer at each tapering step.

Conclusions:

• The study provides a method for optimizing optical nanofiber tapering.
• Results offer practical limits for tapering angles to maintain high transmission.
• Understanding mode energy transfer is critical for fabricating high-efficiency optical components.