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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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80 Gb/s wavelength conversion using a quantum-dot semiconductor optical amplifier and optical filtering.

Christian Meuer1, Carsten Schmidt-Langhorst, René Bonk

  • 1Institut für Festkörperphysik, Technische Universität Berlin, EW 5-2, Hardenbergstr. 36, 10623 Berlin, Germany. chmeuer@sol.physik.tu-berlin.de

Optics Express
|March 30, 2011
PubMed
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This study demonstrates high-performance wavelength conversion for 80 Gb/s signals using quantum-dot amplifiers. Adjusting the delay interferometer filter is key to achieving error-free optical signal transmission.

Area of Science:

  • Photonics
  • Optical Communications
  • Semiconductor Devices

Background:

  • High-speed optical signal processing is crucial for modern telecommunications.
  • Quantum-dot semiconductor optical amplifiers (QD-SOAs) offer unique gain dynamics for wavelength conversion.
  • Existing wavelength conversion techniques face limitations in speed and performance.

Purpose of the Study:

  • To demonstrate wavelength conversion of 40 Gb/s and 80 Gb/s return-to-zero on-off-keying (RZ-OOK) signals.
  • To achieve the highest reported bit-error ratio (BER) performance for QD-SOA based converters.
  • To investigate and mitigate phase dynamics-induced patterning in converted signals.

Main Methods:

  • Utilizing a quantum-dot semiconductor optical amplifier (QD-SOA) for signal amplification and wavelength conversion.

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  • Employing a delay interferometer (DI) as a subsequent filter to select the converted signal.
  • Adapting the free-spectral range (FSR) of the DI to compensate for phase effects.

    • Main Results:

    • Successful wavelength conversion of 40 Gb/s and 80 Gb/s RZ-OOK signals was achieved.
    • The 80 Gb/s wavelength converter demonstrated the highest BER performance reported to date for QD-SOAs.
    • Open eye diagrams indicated fast gain dynamics, while slow phase dynamics caused patterning.

    Conclusions:

    • QD-SOAs combined with DI filters enable high-speed wavelength conversion.
    • Mitigation of slow phase dynamics through DI FSR adaptation is essential for error-free conversion.
    • This approach sets a new benchmark for QD-SOA based wavelength converters.