Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Analysis of Detuning-filter-assisted All-optical Wavelength Conversion Based on a Semiconductor Optical Amplifier with Strong Wavelength Dependence of Gain and Phase

  • Qin, Cui (School of Communication Engineering, Nanjing Institute of Technology) ;
  • Zhao, Jing (School of Communication Engineering, Nanjing Institute of Technology) ;
  • Yu, Huilong (School of Communication Engineering, Nanjing Institute of Technology) ;
  • Zhang, Jian (School of Communication Engineering, Nanjing Institute of Technology)
  • Received : 2016.09.21
  • Accepted : 2017.08.07
  • Published : 2017.12.25
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Abstract

In this paper, we theoretically demonstrate that semiconductor optical amplifiers (SOAs) with strong wavelength dependence of gain and phase are capable of all-optical inverted and non-inverted wavelength conversion (WC) over a wide range, with the assistance of an optical filter. First, the gain dynamics and phase dynamics in a common quantum well (QW) SOA with the $In_{0.53}Ga_{0.47}As/In_{0.7322}Ga_{0.2678}As_{0.5810}P_{0.4190}$ material system are found to be strongly dependent on wavelength, which is mainly related to the wavelength dependence of the differential gain and the differential refractive-index change. Second, the wavelength dependence in an all-optical wavelength converter based on the QW SOA cascaded with a detuning band pass filter is studied. Simulations show that the quality of the converted signal has little dependence on the operation wavelength. Both inverted and non-inverted WC can be achieved, over a large wavelength range. Therefore, although the gain and phase change are strongly wavelength-dependent, the effects of this dependence can be erased by appropriate optical filtering.

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References

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