Abstract
Because passive-optical-networks share the cost of the feeder among many users, and because subcarrier-multiplexing provides an easy way to access independent channels,1 subcarrier-multiplexed passive-optical-networks (SCM-PONs) are a good candidate for fiber-to-the-curb (FTTC) deployment. Unfortunately, optical-beat-interference (OBI) can induce unacceptable bit-error-rates in a SCM-PON. It is well known that broadening the optical spectrum of the sources reduces the spectral noise density due to OBI.2,4 We have demonstrated that this broadening can be achieved by introducing strong "clipping tones" (optical-modulation depth > 1) on each of the lasers. By carefully selecting the RF band used to carry signals, and that used for "clipping tones," OBI can be reduced without the clipping inducing errors. Error-free performance has been achieved, even in the presence of worst-case OBI.
© 1996 Optical Society of America
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