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Sökning: L773:1094 4087 > Liu Sheng > Tidskriftsartikel

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1.
  • Lee, Kwang Jo, et al. (författare)
  • Analysis of acceptable spectral windows of quadratic cascaded nonlinear processes in a periodically poled lithium niobate waveguide
  • 2011
  • Ingår i: Optics Express. - 1094-4087. ; 19:9, s. 8327-8335
  • Tidskriftsartikel (refereegranskat)abstract
    • We report a systematic and comparative study of the acceptance bandwidths of two cascaded quadratic nonlinear processes in periodically poled lithium niobate waveguides, namely cascaded second-harmonic generation and difference-frequency generation (cSHG/DFG) and cascaded sum-frequency generation and difference-frequency generation (cSFG/DFG). We first theoretically and experimentally study the acceptance bandwidths of both the individual second-harmonic generation (SHG) and sum-frequency generation (SFG) processes in the continuous wave (CW) and pulsed-pump regimes. Our results show that the SHG bandwidth is approximately half that of the SFG process in the CW regime, whereas the SHG acceptance bandwidth can approach the CW SFG bandwidth limit when pulsed-pump is used. As a consequence we conclude that the tuning bandwidths of both cascaded processes should be similar in the pulsed pump regime once the pump pulse bandwidths approach that of SFG (i.e. the cSHG/DFG bandwidth is not limited by the CW SHG bandwidth). We confirm that this is the case experimentally.
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2.
  • Lee, Kwang Jo, et al. (författare)
  • OTDM to WDM format conversion based on quadratic cascading in a periodically poled lithium niobate waveguide
  • 2010
  • Ingår i: Optics Express. - 1094-4087. ; 18:10, s. 10282-10288
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose and demonstrate error-free conversion of a 40 Gbit/s optical time division multiplexed signal to 4 x 10 Gbit/s wavelength division multiplexed channels based on cascaded second harmonic and difference frequency generation in a periodically poled lithium niobate waveguide. The technique relies on the generation of spectrally (and temporally) flat linearly chirped pulses which are then optically switched with short data pulses in the nonlinear waveguide. Error-free operation was obtained for all channels with a power penalty below 2dB. (c) 2010 Optical Society of America
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3.
  • Lee, Kwang Jo, et al. (författare)
  • Phase sensitive amplification based on quadratic cascading in a periodically poled lithium niobate waveguide
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:22, s. 20393-20400
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose and demonstrate phase-sensitive amplification based on cascaded second harmonic generation and difference frequency generation within a periodically poled lithium niobate waveguide. Excellent agreement between our numerical simulations and proof-of-principle experiments using a 3-cm waveguide device operating at wavelengths around 1550 nm is obtained. Our experiments confirm the validity and practicality of the approach and illustrate the broad gain bandwidths achievable. Additional simulation results show that the maximum gain/attenuation factor increases quadratically with input pump power, reaching a value of +/- 19.0dB at input pump powers of 33 dBm for a 3 cm-long waveguide. Increased gains/reduced powers for a fixed gain could be achieved using longer crystals.
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4.
  • Liu, Sheng, et al. (författare)
  • Phase-regenerative wavelength conversion in periodically poled lithium niobate waveguides
  • 2011
  • Ingår i: Optics Express. - 1094-4087. ; 19:12, s. 11705-11715
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose and experimentally demonstrate phase-regenerative wavelength conversion in periodically poled lithium niobate waveguides, using either: a single-stage implementation based on a simultaneous combination of two cascaded second-order nonlinear effects in a single periodically poled lithium niobate waveguide, or a two-stage implementation where two separate devices are used in sequence to give rise to the same nonlinear effects. The phase regeneration properties of the proposed wavelength conversion schemes are also investigated.
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