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Picosecond pulse generation from continuous-wave light in an integrated nonlinear Bragg grating.

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Summary

Researchers generated picosecond pulse trains from continuous-wave light using cross-phase modulation in a photonic chip. This novel method overcomes challenges in chip-based pulse generation from low-power signals.

Keywords:
CMOS-compatible devicesnonlinear Bragg gratingsnonlinear opticspulse train generationultra-silicon-rich-nitride

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Area of Science:

  • Photonics and Optical Engineering
  • Nonlinear Optics
  • Integrated Photonics

Background:

  • Generating optical pulse trains from continuous-wave (CW) light is crucial for high-repetition-rate ultrashort pulse generation.
  • Existing methods are well-established in optical fibers but face challenges in photonic chips due to short interaction lengths and dispersion limitations.
  • Achieving efficient pulse train generation from weak CW light on-chip remains a significant hurdle.

Purpose of the Study:

  • To demonstrate a new method for generating picosecond pulse trains from low-power continuous-wave light on a photonic chip.
  • To investigate the underlying physics of pulse train generation in an ultra-silicon-rich nitride platform.
  • To overcome the limitations of short interaction lengths and dispersion control in integrated photonic devices.

Main Methods:

  • Utilized cross-phase modulation (XPM) induced by co-propagating pump pulses (3.7 W peak power).
  • Employed an ultra-silicon-rich nitride (USRN) grating waveguide for enhanced nonlinear interaction.
  • Conducted both experimental measurements and theoretical modeling to analyze pulse generation dynamics.

Main Results:

  • Successfully generated optical pulse trains with durations down to 18 picoseconds (ps) from a low-power CW signal.
  • Demonstrated that the pulse train generation mechanism relies on XPM-induced spectral broadening and subsequent dispersive re-phasing.
  • Validated the experimental findings through theoretical simulations, confirming the efficacy of the proposed approach.

Conclusions:

  • This work presents a novel and effective approach for generating picosecond pulse trains from low-power CW light in photonic integrated circuits.
  • The demonstrated method, leveraging XPM in USRN waveguides, offers a viable solution for on-chip ultrashort pulse generation.
  • This advancement paves the way for simplified generation of high-repetition-rate pulses in compact photonic devices.