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Mode converters based on cascaded long-period waveguide gratings
Optics Letters
|July 2, 2016
Summary
Researchers developed a novel mode-conversion platform using cascaded gratings. This technology enables efficient, polarization-insensitive mode conversion for optical communication systems.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Mode-division multiplexing (MDM) systems require efficient mode converters.
- Existing mode converters often suffer from polarization dependence or low efficiency.
Purpose of the Study:
- To propose and demonstrate a novel platform for polarization-insensitive mode conversion.
- To achieve efficient conversion between various optical modes using cascaded gratings.
Main Methods:
- Fabrication of devices using cascaded surface-corrugated and sidewall-corrugated gratings.
- Experimental characterization of mode conversion efficiency and polarization dependence.
- Utilizing polymer materials for device fabrication.
Main Results:
- Demonstrated a device for cyclic conversion among LP01, LP11b, and LP11a modes with 94% efficiency at 1540 nm.
- Demonstrated a device for LP01 to LP21a mode conversion with >90% efficiency at 1550 nm.
- Both devices exhibited polarization-insensitive performance.
Conclusions:
- The proposed cascaded grating platform is effective for polarization-insensitive mode conversion.
- This technology holds potential for developing advanced mode converters for MDM systems.
- The platform can be adapted for various mode-sensitive optical applications.
