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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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A flat-output widely tunable laser based on parallel-ring resonator integrated with electroabsorption modulator.

Toru Segawa1, Wataru Kobayashi, Tomonari Sato

  • 1NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan. segawa.toru@lab.ntt.co.jp

Optics Express
|December 25, 2012
PubMed
Summary

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We developed a novel tunable laser with an integrated modulator for stable wavelength tuning. This device achieves clear eye openings at 25 Gbit/s, enabling high-speed optical communication.

Area of Science:

  • Photonics
  • Optoelectronics
  • Integrated Optics

Background:

  • Tunable lasers are crucial for optical communication systems.
  • Integration of lasers and modulators simplifies device architecture and improves performance.

Purpose of the Study:

  • To present a novel parallel-ring-resonator tunable laser monolithically integrated with an electroabsorption modulator.
  • To demonstrate stable wavelength tuning and high-speed modulation capabilities.

Main Methods:

  • Monolithic integration of a parallel-ring-resonator tunable laser with an InGaAlAs electroabsorption modulator.
  • Characterization of wavelength tuning range, step, output power stability, and modulation performance.

Main Results:

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  • Stable wavelength tuning with a 200 GHz step over a 35 nm range using single electrode control.
  • Less than 1 dB variation in laser output power with tuning.
  • Demonstrated clear eye openings at 25 Gbit/s with >10 dB extinction ratio over a 25.7 nm range.
  • Confirmed error-free operation at 45 °C with a 2 V voltage swing.

    • Conclusions:

    • The fabricated device offers stable and wide-range wavelength tuning.
    • The integrated laser-modulator demonstrates high-speed, error-free operation suitable for optical communication.