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All-optical frequency conversion using nonlinear dynamics of semiconductor lasers.

Sheng-Kwang Hwang1, How-Foo Chen, Che-Yang Lin

  • 1Department of Electro-Optical Engineering, National Cheng Kung University, Tainan, Taiwan. skhwang@mail.ncku.edu.tw

Optics Letters
|March 14, 2009
PubMed
Summary
This summary is machine-generated.

This study demonstrates a novel semiconductor laser frequency conversion technique using optical injection. The method achieves high-speed, modulation-transparent frequency conversion with continuous tuning and simultaneous up/downconversion capabilities.

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Area of Science:

  • Nonlinear optics
  • Semiconductor laser dynamics
  • Optical communications

Background:

  • Semiconductor lasers exhibit complex dynamics under optical injection, including period-one dynamics via Hopf bifurcation.
  • Frequency-shifted signals generated through this nonlinear process can be harnessed for optical frequency conversion.

Purpose of the Study:

  • To develop a novel semiconductor laser-based frequency conversion technique.
  • To demonstrate modulation format transparency and continuous tunability of the frequency shift.
  • To achieve simultaneous frequency down-, no-, and upconversion.

Main Methods:

  • Utilizing a standard semiconductor laser subjected to optical injection to induce period-one dynamics.
  • Exploiting the emergent, equally and oppositely frequency-shifted optical signals for conversion.
  • Controlling injection level and frequency to tune the frequency shift.

Main Results:

  • Achieved frequency conversion with a bit-error ratio as low as 10(-12) at 2.5 Gbits/s.
  • Demonstrated no or slight power penalty, indicating modulation format transparency (amplitude, frequency, and phase modulation).
  • Successfully achieved simultaneous and individually selectable frequency down-, no-, and upconversion.

Conclusions:

  • The proposed method offers a flexible and reconfigurable approach to optical frequency conversion using a single semiconductor laser.
  • The system's modulation format transparency and tunable frequency shift are significant advantages for optical communication systems.
  • This technique eliminates the need for external pump or probe lasers, simplifying the conversion unit.