Performance monitoring device and method of optical amplifier, performance monitor, performance monitoring device and method of transmission system, performance monitoring method of amplifier, transmission system, fault location detection device and optical amplifier in transmission system

摘要

The monitoring of the optical amplifier detects the voice power level modulated by the signal input to the amplifier to determine the performance indication of the amplifier, detects the output power level of the amplifier, and compares the amplifier's voice power level with the output power level. Achieved by the apparatus and method.;In an exemplary embodiment of the invention, each individual channel in the multiplexed optical signal is modulated with a unique low frequency voice. Modulation is performed at the transmission position of the optical signal, and a unique speech frequency is selected that is lower than the low frequency at which any other information encoded with the optical signal is cut off. The channel power of each channel is determined after each optical amplifier stage in the network by measuring each unique low frequency voice power using a low cost monitor. In addition, the total optical output power of the optical amplifier is measured by the monitor. The ratio between the voice power and the output power of the optical amplifier after the first optical amplifier stage in the communication network is compared with the voice power / output power ratio at each subsequent optical amplifier stage. The change between the first and subsequent voice power / output power ratios reflects a change in network performance. The change in voice power / output power ratio is strongly correlated with the actual change in optical signal-to-noise ratio. Advantageously, such a monitor can be embedded in each optical amplifier in the network, and no complicated verification of any part in the network is required. Since each optical amplifier has a dedicated monitor that determines the state of each channel, failures in the network can be reliably and quickly found in the optical amplifier and in the particular channel.