External optical feedback effects on intensity noise ofvertical-cavity surface-emitting lasers |
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| Authors: | Ho KP Walker JD Kahn JM |
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| Affiliation: | Dept. of Electr. & Comput. Sci., California Univ., Berkeley, CA; |
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| Abstract: | The authors have experimentally evaluated the effect of external optical feedback on the relative intensity noise (RIN) of a vertical-cavity surface-emitting laser (VCSEL) diode. In the absence of optical feedback, the smallest RIN is found to be -135 dB/Hz. For optical feedback levels approaching -25 dB, the RIN is degraded by about 20 dB. The authors have measured feedback-induced power penalties in a 500-Mb/s intensity-modulation/direct-detection (IM/DD) link and determined that the penalty exceeds 1 dB if the optical feedback ratio is larger than -30 dB |
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