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与常规SDH系统不同,带光放大器的WDM系统增加了对EDFA光放大器监视和管理。由于在EDFA的光中继器上业务信号不进行上下,无电接口接入,只有光信号的放大,而且业务信号的开销(如SDH)上也没有对EDFA进行控制和监控的字节,因而必须增加一个电信号对EDFA的运行状态进行监控。现在经常采用的是在一个新波长上传送监控信号。
Unlike conventional SDH systems, WDM systems with optical amplifiers add the ability to monitor and manage EDFA optical amplifiers. Because the service signal on the optical repeater of the EDFA is not uplink and downlink, and the interface without electrical access, only the optical signal is amplified, and there is no byte for controlling and monitoring the EDFA in the overhead of the service signal (for example, SDH), thus An electrical signal must be added to monitor the operational status of EDFA. Now often used in a new wavelength transmission monitoring signal.