This work focuses on the established self-homodyne coherent receiver (SHCR) method, which is enabled by recent advancements in chip-based coherent receivers. The accuracy of the SHCR method strongly depends on the fiber delay employed. This effect, critical when characterizing narrow-linewidth lasers, is not documented to our knowledge. We present a comprehensive study of this dependence, yielding an optimal fiber delay that maximizes signal-to-noise ratio. The results are validated by comparison with a commercial frequency-noise analyzer, which shows a comparable accuracy between both methods.
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