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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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All-optical UWB generation and modulation using SOA-XPM effect and DWDM-based multi-channel frequency discrimination.

Fei Wang1, Jianji Dong, Enming Xu

  • 1Wuhan National Laboratory for Optoelectronics & School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.

Optics Express
|December 18, 2010
PubMed
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This study introduces an all-optical method for generating and modulating ultrawideband (UWB) pulses using semiconductor optical amplifier cross-phase modulation and DWDM discrimination. This technique enables multiuser UWB-Over-Fiber communications.

Area of Science:

  • Optoelectronics
  • Optical Communications
  • Signal Processing

Background:

  • Ultrawideband (UWB) pulses offer high data rates but require efficient generation and modulation techniques.
  • Existing methods for UWB pulse generation and modulation can be complex and costly.
  • Optical methods are being explored for high-speed communication systems.

Purpose of the Study:

  • To propose and demonstrate an all-optical scheme for UWB pulse generation and modulation.
  • To leverage the cross-phase modulation (XPM) effect in semiconductor optical amplifiers (SOAs).
  • To utilize DWDM-based multi-channel frequency discrimination for UWB signal processing.

Main Methods:

  • Injecting Gaussian pulse light and a wavelength-tunable CW probe light into an SOA to induce temporal chirp via SOA-XPM.

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  • Using DWDM channels as multi-channel frequency discriminators to convert phase modulation to intensity modulation.
  • Tuning the chirped probe light to DWDM channel slopes for pulse generation and modulation.

    • Main Results:

    • Successfully generated inverted polarity Gaussian monocycle and doublet UWB pulses.
    • Achieved multi-channel or binary-phase-coded UWB signal generation by using multiple DWDM channels.
    • Demonstrated realization of pulse amplitude modulation (PAM), pulse polarity modulation (PPM), and pulse shape modulation (PSM) for UWB pulses.

    Conclusions:

    • The proposed all-optical scheme effectively generates and modulates UWB pulses.
    • The method shows potential for multiuser UWB-Over-Fiber communication systems.
    • The scheme offers flexibility in UWB signal generation and modulation types.