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Compact slow-light waveguide and modulator on thin-film lithium niobate platform.

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Summary

Researchers developed ultra-compact slow-light Mach-Zehnder modulators on thin-film lithium niobate. These devices achieve over 50 GHz electro-optic bandwidth, enabling high-speed optical interconnects.

Keywords:
Bragg gratingelectro-optic modulatorslow-light effectthin-film lithium niobate

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Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Compact and fast electro-optic modulators are crucial for advanced optical interconnects.
  • Thin-film lithium niobate (TFLN) is a promising platform for integrated photonics.

Purpose of the Study:

  • To demonstrate the slow-light (SL) effect on a TFLN platform.
  • To construct an ultra-compact SL Mach-Zehnder modulator (SL-MZM) with enhanced electro-optic (EO) performance.
  • To achieve high-speed optical data transmission.

Main Methods:

  • Fabrication of SL waveguides using a coupled Bragg resonator structure on TFLN.
  • Construction of an ultra-compact SL-MZM (L ≈ 370 μm).
  • Characterization of optical and EO properties, including passband width, insertion loss, group index, and EO bandwidth.
  • High-speed On-Off Keying (OOK) transmission experiments.

Main Results:

  • Achieved a large optical passband width of ~8 nm and a maximal optical group index of 7.50 (3.4x that of regular TFLN rib waveguides).
  • Demonstrated an ultra-compact SL-MZM with an EO bandwidth exceeding 50 GHz over an ~8 nm wavelength band.
  • Successfully performed high-speed OOK transmissions at 64 Gbit/s and 80 Gbit/s.

Conclusions:

  • This work presents the first monolithic TFLN SL waveguides and compact SL-MZMs with >50 GHz EO bandwidth.
  • The developed SL-MZM technology offers significant potential for next-generation optical interconnect systems.
  • The achieved performance highlights the viability of SL effects for enhancing EO modulator capabilities on the TFLN platform.