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UWB monocycle pulse generation using two-photon absorption in a silicon waveguide.

Yang Yue1, Hao Huang, Lin Zhang

  • 1Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. yyue@usc.edu

Optics Letters
|February 21, 2012
PubMed
Summary
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Researchers generated ultrawideband monocycle pulses using silicon waveguides and two-photon absorption. This method achieves a 131.7% fractional 10 dB bandwidth, enabling tunable radio frequency applications.

Area of Science:

  • Photonics
  • Nonlinear Optics
  • Semiconductor Devices

Background:

  • Monocycle pulses are crucial for ultrawideband (UWB) communication systems.
  • Generating UWB monocycle pulses with wide fractional bandwidths and tunable properties remains a challenge.
  • Nonlinear optical effects in silicon waveguides offer potential for novel pulse generation techniques.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel method for generating ultrawideband monocycle pulses.
  • To investigate the use of nondegenerate two-photon absorption in silicon waveguides for pulse shaping.
  • To achieve a highly symmetric, negative monocycle pulse with a large fractional bandwidth.

Main Methods:

  • Utilizing nondegenerate two-photon absorption in a silicon waveguide.

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Last Updated: May 24, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Published on: April 4, 2017

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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  • Employing a pulsed pump and an inverted probe pulse.
  • Compensating for free-carrier absorption-induced pulse tails through pulse overlap.
  • Employing an optical delay line for tuning spectral characteristics.

    • Main Results:

    • Successfully generated a 143 ps Gaussian monocycle pulse.
    • Achieved a fractional 10 dB bandwidth of 131.7% using a 68 ps pulsed pump.
    • Demonstrated tunability of the 10 dB bandwidth and center frequency of the RF spectrum.
    • Experimentally verified stable performance over a 30 nm operational optical bandwidth.

    Conclusions:

    • Nondegenerate two-photon absorption in silicon waveguides is an effective method for generating ultrawideband monocycle pulses.
    • The demonstrated technique offers significant fractional bandwidth and tunability for RF applications.
    • The method shows promise for further development towards even larger optical bandwidths.