| 摘要 |
A communications network element (10) comprises an input (12) to receive an input optical signal having an input spectral property and carrying input traffic, an output (14) and a monitoring port (16). Optical signal processing apparatus (18) to receive the input signal and to form an output optical signal having an output spectral property and carrying output traffic. An optical splitter (20) to tap off a part of one of the input signal and the output signal to forma tapped signal having a respective one of the input spectral property and input traffic, and the output spectral property and output traffic. Optical signal transforming apparatus (22) to receive the tapped signal and to apply an optical transfer function (OTF) to it to form an optical monitoring signal, and to provide the monitoring signal to the monitoring port. The OTF preserves the spectral property of the tapped signal and applies a time-domain obfuscation to the tapped signal. |
