Optical carrier supply by spectrum slicing and modulation and amplification by RSOA is a way of reducing costs in WDM PON but it gives a noisy transmission due to excess intensity noise of broadband sources, Amplified Spontaneous emission of the SOA and beat noise at detection.
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Aside from the multiple access interference, some of the adverse impacts of system performance are also taken into consideration, which include thermal noise, shot noise, relative intensity noise, and beat noise.
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The beat noise exceeded the thermal noise for reference power values larger than about 0.1 mW.
Even weak reference power is sufficient for the beat noise to exceed the thermal noise of the photoreceivers, and the floor of the signal-to-noise ratio is determined by the beat noise.
For an SOA, the beat noise is proportional to 2 Nsp, where Nsp is the spontaneous emission factor.
The noise due to ASE light made negligible contribution compared with the beat noise which determined the noise floor of the present experiment as explained in section 3.2.
Without a signal in the SA, the beat noise was measured as a function of the reference power measured at the input of C2.
