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Frequency Response of Thermo-Optic Phase Modulators Based on Fluorinated Polyimide Polymer Waveguide.

Eun-Su Lee1, Kwon-Wook Chun1, Jinung Jin1

  • 1Department of Electronics Engineering, Pusan National University, Busan 46241, Korea.

Polymers
|June 10, 2022
PubMed
Summary

This study presents a novel polymer waveguide phase modulator for optical phased array beam scanners. The device shows a fast response time, crucial for efficient beam steering applications.

Keywords:
fluorinated polyimideoptical phased arrayphase modulatorpolymer waveguide

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Polymer waveguide phase modulators offer stable low-power modulation and thermal isolation.
  • These properties are essential for optical phased array (OPA) beam scanner devices.

Purpose of the Study:

  • To design and fabricate a waveguide phase modulator using a high-refractive-index fluorinated polyimide.
  • To characterize its performance, including propagation loss, temporal response, and transfer function.

Main Methods:

  • Fabrication of a waveguide phase modulator using fluorinated polyimide.
  • Characterization of propagation loss and temporal response.
  • Measurement of frequency response to obtain the transfer function.

Main Results:

  • The polyimide waveguide modulator demonstrated a fast response time of 117 μs for a 1 kHz input signal.
  • An additional 5% phase change was observed within 5 seconds for a 1 mHz step-function input.
  • The transfer function revealed multiple poles and zeros, indicating complex dynamic behavior.

Conclusions:

  • The developed polyimide waveguide phase modulator is suitable for OPA beam scanners due to its thermal properties and modulation capabilities.
  • Further investigation into the observed secondary phase change is warranted for optimizing device performance.