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The influence of external optical feedback(OFB) on the light-current characteristics of the vertical-cavity surface-emitting lasers(VCSELs) was investigated theoretically and experimentally.By calculating the OFB sensitivity parameter,the OFB sensibility of the VCSELs was compared with the edge emitting lasers.Based on the compound cavity theory,the light-current characteristic parameters of the VCSELs with external OFB,such as the threshold current and the slope efficiency,were calculated.The experimental results indicated that the threshold current of the VCSELs with different DBR reflectivities decreased to different degrees,accompanied with a decrease of slope efficiency when under 10%feedback ratio of the external OFB,which is in good agreement with the theoretical calculation.
The influence of external optical feedback (OFB) on the light-current characteristics of the vertical-cavity surface-emitting lasers (VCSELs) was investigated theoretically and experimentally.By calculating the OFB sensitivity parameter, the OFB sensibility of the VCSELs was compared with the edge emitting lasers. Based on the compound cavity theory, the light-current characteristic parameters of the VCSELs with external OFB, such as the threshold current and the slope efficiency, were calculated. the experimental results indicated that the threshold current of the VCSELs with different DBR reflectivities decreased to different degrees, accompanied with a decrease of slope efficiency when under 10% feedback ratio of the external OFB, which is in good agreement with the theoretical calculation.