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Simple fabrication of a double-layer multi-channel optical waveguide using passive alignment.

Jin Hwa Ryu1, Tea Ho Lee, In-Kui Cho

  • 1Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, South Korea.

Optics Express
|January 26, 2011
PubMed
Summary

This study presents a cost-effective method for fabricating double-layer polymeric optical waveguides using sequential hot-embossing. This technique ensures precise passive alignment and minimal propagation loss for optical communication applications.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Nanotechnology

Background:

  • Polymeric optical waveguides are crucial for optical communication.
  • Achieving precise alignment in multi-layer structures is challenging.
  • Existing fabrication methods can be complex and expensive.

Purpose of the Study:

  • To develop a simple and cost-effective method for fabricating double-layer polymeric optical waveguides.
  • To achieve passive alignment between the top and bottom layers.
  • To minimize propagation loss and ensure channel uniformity.

Main Methods:

  • Sequential hot-embossing processes using a single stamp and template.
  • Fabrication of a buffer layer to protect the channel structure during the second hot-embossing step.
  • Utilizing a metal template for automatic passive alignment of layers.

Main Results:

  • A 2x50 channel polymeric multimode optical waveguide was successfully fabricated.
  • Positional tolerances between layers were controlled to less than ±5 μm.
  • Propagation loss was below 0.2 dB/cm at 850 nm, with channel uniformity below 0.5 dB.

Conclusions:

  • The proposed hot-embossing method is a viable and cost-effective approach for fabricating double-layer polymeric optical waveguides.
  • The method ensures high precision in layer alignment and excellent optical performance.
  • This technique has potential applications in integrated optics and optical interconnects.