Data signal and monitoring signal sending and receiving method and device

Abstract

The invention discloses a data signal and monitoring signal sending and receiving method and device. It is avoided that a complex and expensive optical coherent receiver is configured on a monitoring node to receive and demodulate monitoring signals. The method includes the steps of determining data signals and monitoring signals to be sent at a sending end, conducting high-frequency coherent phase modulation on the data signals, conducting low-frequency amplitude modulation on the monitoring signals, adding the monitoring signals where amplitude modulation is conducted to the data signals where phase modulation is conducted, and sending the signals to a receiving end. When the receiving end receives the signals, the signals are filtered on a frequency domain through a low pass filter, and then the noise-contained monitoring signals where low-frequency amplitude modulation is conducted can be obtained and received by an ordinary low-frequency optical detector, then the monitoring signals can be obtained through low-frequency electric domain signal processing, and it is avoided that the complex and expensive optical coherent receiver is configured on the monitoring node to receive and demodulate the monitoring signals.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for sending and receiving data signals and monitoring signals. Background technique [0002] The explosive growth of broadband demand has brought enormous pressure to the transmission network of the optical communication system. In order to increase the transmission capacity, a high-speed transmission system is required. [0003] At present, in high-speed transmission systems, high-speed optical coherent phase modulation technology is widely used at the transmitting end, and the monitoring signal and data signal in the optical communication system are modulated and processed by the same modulation method, and then transmitted to the receiving end together. figure 1 Shown is a schematic diagram of the time-domain signal obtained after the monitoring signal and data signal are modulated by high-speed optical coherent phase modulation technology. Using hi...

AI Technical Summary

Problems solved by technology

However, in order to realize the manageability and controllability of the transmission network, in the process of transmitting the modulated monitoring signal and the data signal together, many monitoring nodes (intermediate nodes) of the transmission network need to demodulate the monitoring signal. The monitoring signal and the data signal are transmitted together, so complex and expensive optical coherent receivers need to be configured on the monitoring node and complete high-frequency electrical domain signal processing, resulting in high costs

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