Ultra-compact polarization-independent 3 dB power splitter in silicon

Area of Science:

• Photonics and Optical Engineering
• Materials Science

Background:

• Integrated photonics relies on efficient power splitting components.
• Existing power splitters often face challenges with size and polarization dependence.

Purpose of the Study:

• To demonstrate an ultra-compact, polarization-independent 3 dB power splitter.
• To leverage subwavelength structures for improved performance and miniaturization.

Main Methods:

• Experimental fabrication on a silicon-on-insulator platform.
• Utilizing subwavelength structure engineering to manage polarization coupling.
• Device characterization across a specified wavelength range.

Main Results:

• Achieved an ultra-compact device footprint (1.2µm × 2.62µm).
• Demonstrated polarization-independent operation for both TE and TM modes.
• Obtained a 3 dB power splitting ratio with an operating bandwidth over 50 nm (1540-1590 nm).

Conclusions:

• The developed device offers a significant advancement in compact integrated photonic components.
• Subwavelength structuring is an effective strategy for polarization-independent photonic devices.
• This technology has potential applications in optical communication and sensing systems.