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Compact and efficient three-mode (de)multiplexer based on horizontal polymer waveguide couplers
Optics Express
|February 25, 2022
Summary
Researchers developed a polymer three-mode (de)multiplexer using cascaded waveguide directional couplers. This device enhances optical communication channel capacity by enabling multiplexing of three modes in two dimensions.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Optical communication systems require efficient multiplexing/demultiplexing devices to increase channel capacity.
- Waveguide directional couplers are fundamental components in integrated optics for mode manipulation.
Purpose of the Study:
- To propose and demonstrate a compact and efficient polymer three-mode (de)multiplexer.
- To achieve high coupling efficiency between different spatial modes in optical waveguides.
Main Methods:
- Fabrication of a polymer waveguide structure with two cascaded directional couplers on a single substrate.
- Optimization of waveguide core dimensions (height and width) for mode coupling.
- Utilizing ultraviolet (UV) lithography for device fabrication.
Main Results:
- The fabricated device achieved coupling ratios of 98.07% and 95.43% for the two couplers.
- Insertion losses for the three waveguides were measured as 5.23 dB, 8.58 dB, and 14.39 dB.
- The device successfully multiplexes three modes in two dimensions at a wavelength of 1310 nm.
Conclusions:
- The proposed polymer three-mode (de)multiplexer is compact, efficient, and fabricated with high precision.
- The device demonstrates the potential to significantly increase optical communication channel capacity.
- The design and fabrication methods are suitable for practical implementation in optical communication systems.
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