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Relative Intensity Noise (RIN)

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Relative Intensity Noise (RIN)

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RIN is defined as a measure of the intensity noise from the laser, which has an important impact on intensity modulated signals such as NRZ and PAM4 optical modulation formats. The RIN is one contribution to laser linewidth with the other contribution being phase noise. The ideal output intensity of a laser biased at a D.C. level when all the parameters influencing the laser, such as bias, optical reflection and temperature, are assumed to be constant is shown and is represented by the light blue line. In practice, the output of a laser can fluctuate in both intensity and phase.

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