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For frequency-independent gain and loss, the circuit theory of photonic noise based on the Nyquist noise sources reduces to a corpuscular theory that postulates independent shot-noise fluctuations of the particle rates. For linear gain, the corpuscular theory coincides with standard rate equations (SREs). When the relative gain compression is comparable with unity, however, SREs are in error by a...
We have calculated the noise-enhancement factor of a semiconductor laser amplifier with a very thin active region. This (somewhat academic) model exhibits large Petermann's K-factors. However, the calculated noise-enhancement factor K? is only about half the K-value. The reason for the discrepancy is that in evaluating K? the radiation modes of the guiding structure have been taken into account. Similar...
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