Photonics Research, Volume. 2, Issue 4, B11(2014)

Optical generation of tunable and narrow linewidth radio frequency signal based on mutual locking between integrated semiconductor lasers

Ning Zhang1,2, Xinlun Cai2, and and Siyuan Yu1,2、*
Author Affiliations
  • 1Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1UB, UK
  • 2State Key Laboratory of Optoelectronic Materials and Technology, School of Physical Science and Engineering Technologies, Sun Yat-sen University, Guangzhou 510 275, China
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    Figures & Tables(9)
    Schematic diagram of RF signal generation circuit based on mutual locking among two DFB lasers and one SRL.
    Spectra of (a) dual DFB injection-locked SRL modes in the CCW and CW directions, and (b) generated RF signal by beating the two lasing modes in the CCW direction. Pdfb1,2=0.23 dBm, Psrl−fr=−20.3 dBm, and Δω=0.
    FN curves of DFB lasers, SRL, and the generated RF signals.
    Linewidth of the generated RF signal as a function of tuning frequency.
    Influence of backscattering coefficient and feedback phase change on the linewidth of the generated RF signal. (a) General evolution, with linewidth expressed in log, (b) results of two special k values. Pdfb1,2=0.23 dBm, Psrl=−20.3 dBm, and Δω=0.
    Linewidth of the generated RF signal (in log) as a function of (a) power ratio (Pdfb/Psrl), where Pdfb=Pdfb1=Pdfb2 and Δω=0, and (b) power ratio (Pdfb2/Pdfb1), where Pdfb1=0.23 dBm and Δω=0.
    Linewidth of the generated RF signal (in log) as a function of the injection frequency detuning of the two DFB lasers.
    • Table 1. Values of the DFB Parameters Used for Numerical Simulation

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      Table 1. Values of the DFB Parameters Used for Numerical Simulation

      ParameterDescriptionValueUnit
      VVolume of the active region150μm3
      LdfbLength of DFB laser300μm
      ndfbRefractive index of the active region3.525
      αdfbLinewidth enhancement factor5
      Gth0Threshold gain level2.44×1011s1
      NgElectron number at transparency1.328×108
      RfPower reflectivity of the front facet0.2
      RbPower reflectivity of the back facet0.9
      kdfbCoupling ratio into DFB laser cavity0.3
    • Table 2. Values of the SRL Parameters Used for Numerical Simulation

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      Table 2. Values of the SRL Parameters Used for Numerical Simulation

      ParameterDescriptionValueUnit
      LsrlSRL cavity length4106μm3
      N0Transparency carrier density2.2×1024m3
      αsrlLinewidth enhancement factor1. 57
      aGain-slope coefficient6.35×1020m2
      nsrlGroup index3.7
      kcConservative coupling0.0044s1
      kdDissipative coupling0.000327s1
      kcpCoupling ratio into SRL cavity0.3
      τpPhoton lifetime in SRL10ps
      λ0Central lasing wavelength1550nm
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    Ning Zhang, Xinlun Cai, and Siyuan Yu. Optical generation of tunable and narrow linewidth radio frequency signal based on mutual locking between integrated semiconductor lasers[J]. Photonics Research, 2014, 2(4): B11

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    Paper Information

    Special Issue: MICROWAVE PHOTONICS

    Received: Mar. 28, 2014

    Accepted: May. 4, 2014

    Published Online: Sep. 15, 2014

    The Author Email: and Siyuan Yu (S.Yu@bristol.ac.uk)

    DOI:10.1364/PRJ.2.000B11

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