Abstract: A classification device constructs tree structure data in which attribute information relating to a single communication or multiple communications serves as a terminal node, from a series of communications with a single communication destination or multiple communication destinations that take place when software is executed, calculates attribute information on a higher node on the basis of attribute information on the terminal node, and classifies the software by specifying the type of the software on the basis of attribute information on the highest node.

Abstract: The present invention suppresses to a minimum the degradation of the transmission quality caused by chromatic dispersion characteristic of an optical transmission medium, and the interplay between the chromatic dispersion and non-linear optical effects in dense WDM transport systems. A baseband input data signal is pre-coded in advance by a pre-coding unit, phase modulation is carried out using a pre-coded signal by the optical phase modulating unit, and the phase modulated optical signal is converted to an RZ intensity modulated signal by the optical filter unit that performs phase-shift-keying to amplitude-shift-keying conversion. For example, an optical phase modulating unit generates an encoded DPSK phase modulated signal using a differential phase shirt keying (DPSK) format, and a phase modulated signal is converted to an RZ intensity modulated signal by the optical filter unit disposed downstream of the optical phase modulating unit.