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Programmable Spectral Filter in C-Band Based on Digital Micromirror Device.

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Summary

This study introduces a novel digital micromirror device (DMD) optical filter achieving a 12.5 GHz bandwidth, narrower than current micro-electrical-mechanical system (MEMS) filters. This programmable filter offers flexible, simultaneous multi-waveband filtering for telecommunications.

Keywords:
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Area of Science:

  • Photonics and Optical Engineering
  • Telecommunications Technology

Background:

  • Micro-electrical-mechanical system (MEMS) optical filters dominate current markets but have limited bandwidth (≥25 GHz).
  • Existing filters struggle to meet the International Telecommunication Union (ITU) G.694.1 standard's narrow channel spacing requirements.
  • High-power optical filtering applications are constrained by device limitations.

Purpose of the Study:

  • To develop and demonstrate a programmable optical filter with a narrower bandwidth than existing MEMS filters.
  • To enable flexible, simultaneous filtering of multiple wavebands in the C-band.
  • To assess the suitability of digital micromirror device (DMD) technology for high-power optical filtering.

Main Methods:

  • Experimental implementation of a programmable optical filter utilizing a digital micromirror device (DMD).
  • Remote uploading of binary holograms to the DMD for filter configuration.
  • Characterization of filter performance, including bandwidth, channel tunability, and insertion loss.

Main Results:

  • Demonstrated a minimum filter bandwidth of 12.5 GHz, aligning with the ITU G.694.1 standard.
  • Achieved independent adjustment of channel number, center wavelength, bandwidth, and output power.
  • Exhibited a center wavelength tuning resolution of 0.033 nm and ~10 dB insertion loss across the C-band.
  • DMD exhibits a high power handling capability (25 KW/cm²), significantly exceeding LCoS technology.

Conclusions:

  • DMD-based optical filters offer superior bandwidth and flexibility compared to MEMS filters.
  • The demonstrated filter meets stringent telecommunication standards for channel spacing.
  • The high power handling capability of DMDs makes them ideal for high-power optical applications.