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Pulse compression and modelocking by using TPA in silicon waveguides.

En-Kuang Tien1, Nuh S Yuksek, Feng Qian

  • 1EECS Department, University of California, Irvine, CA 92697, USA.

Optics Express
|June 24, 2009
PubMed
Summary
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We demonstrate a novel silicon waveguide technique for broadband pulse compression and modelocking. This method achieves over 20-fold pulse compression and 200 ps modelocked pulses, with potential for sub-20 ps optical pulses.

Area of Science:

  • Photonics and Optical Engineering
  • Semiconductor Device Physics
  • Nonlinear Optics

Background:

  • Mode-locked lasers are crucial for various applications requiring ultrashort optical pulses.
  • Existing pulse compression techniques often face limitations in efficiency or scalability.
  • Silicon photonics offers a promising platform for integrated optical devices due to its nonlinear properties.

Purpose of the Study:

  • To demonstrate a novel scheme for broadband pulse compression and mode-locking using silicon waveguides.
  • To investigate the impact of material properties and signal parameters on pulse generation.
  • To explore the potential for achieving ultrashort optical pulses with this technique.

Main Methods:

  • Utilizing two-photon absorption (TPA) in silicon waveguides to induce nonlinear modulation.

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  • Implementing a broadband pulse compression and mode-locking scheme.
  • Experimentally characterizing the generated optical pulses and analyzing critical parameters.

    • Main Results:

    • Achieved greater than 20-fold pulse compression.
    • Generated 200 picosecond (ps) mode-locked pulses.
    • Identified free carrier lifetime and modulation signal width as critical parameters influencing output pulse width.

    Conclusions:

    • The demonstrated TPA-based scheme in silicon waveguides is effective for pulse compression and mode-locking.
    • The technique shows potential for generating ultrashort optical pulses, with theoretical calculations suggesting sub-20 ps pulses are achievable.
    • Further optimization of parameters could lead to enhanced performance for various photonic applications.