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Programmable and tunable flat-top supercontinuum laser sources via electro-optic intensity and phase modulation

Minhyup Song1, Minje Song2, Seungyoung Lim3,4

  • 1Photonic/Wireless Devices Research Division, Electronics and Telecommunication Research Institute, Daejeon, 34129, South Korea. sminhyup@etri.re.kr.

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We developed tunable, flat-topped supercontinuum lasers with programmable bandwidths. This advanced laser technology maintains high coherence, enabling robust optical carrier generation.

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Area of Science:

  • Photonics and Laser Technology
  • Optical Engineering
  • Quantum Optics

Background:

  • Supercontinuum sources are crucial for various applications requiring broad optical bandwidths.
  • Existing methods for generating supercontinuum lasers often lack tunability and programmability.
  • Maintaining coherence in broadband light sources is essential for precise measurements and advanced applications.

Purpose of the Study:

  • To present novel flat-topped coherent supercontinuum lasers.
  • To achieve tunable repetition rates and programmable spectral bandwidths.
  • To demonstrate the coherence properties of the developed supercontinuum source.

Main Methods:

  • Merging nonlinearly broadened electro-optic optical frequency combs with optical line-by-line spectrum shaping.
  • Implementing spectral bandwidth programming via iterative spectrum shaping and input power control.
  • Tuning repetition rates using modulation speed control in optical frequency combs.
  • Utilizing a modified self-heterodyne method with a Mach-Zehnder interferometer for phase noise analysis.

Main Results:

  • Demonstrated a programmable and tunable flat-topped supercontinuum with a maximum bandwidth of 55 nm and repetition rate of 50 GHz.
  • Phase noise analysis confirmed minimal degradation, with single-sideband spectra similar to the RF clock.
  • Validated the coherence and robustness of the supercontinuum generation process.

Conclusions:

  • Successfully developed a programmable and tunable flat-topped supercontinuum laser.
  • The proposed method preserves the phase noise properties of the optical frequency comb.
  • This technology enables the generation of hundreds of robust, coherent, and programmable optical carriers.