System and method for subcarrier modulation in ISM band as supervisory channel
A technology of sub-carrier and monitoring signal, applied in the field of telecommunications, can solve problems such as the degradation of monitoring signal performance, and achieve the effects of simple configuration, simplified implementation, and cost reduction
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[0032] The invention relates to the technical field of telecommunications, in particular to a system and method for modulating a subcarrier into a monitoring channel. In the enumerated embodiments, the present invention is applied to an optical network, but it should be noted that the practical application scope of the present invention is wider.
[0033] At low frequencies, the subcarrier can be modulated as a supervisory channel. Since the subcarrier frequency overlaps with the main data spectrum, the latter acts like a high-level noise source to the subcarrier signal. Due to the limitation of the high spectral density of the data signal, the low-frequency subcarrier modulation generally supports the monitoring signal of the kbps level transmission rate. For example, the supervisory channel has a transfer rate of 9.6 kbps. In modern optical networks, terminal nodes usually require communication at a higher speed than kbps.
[0034] FIG. 1 is a simplified schematic diagram...
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