Patent ID: 8406626

Claim:
An optical network designing apparatus comprising a processor configured to perform a procedure including: holding values of one or more optical-transmission parameters corresponding to one or more components constituting said optical network; generating a plurality of design candidates for a part to be arranged in each of one or more spans between nodes of the optical network so that each of the plurality of design candidates contains at least one of said one or more components; making a selection, for said each of the one or more spans, of one of the plurality of design candidates which has at least one value of at least one of said one or more optical-transmission parameters satisfying a design condition; constructing the optical network by combining one or more parts each of which is selected by said making; and performing a quality examination of one or more functions for designing said optical network, wherein the performing selects a predetermined one of said one or more optical-transmission parameters, seeks a value of the predetermined one of the one or more optical-transmission parameters at a limit of normal transmission by varying the predetermined one of the one or more optical-transmission parameters in said optical network constructed by the constructing, calculates a first value of a predetermined characteristic at a first point in a range of the predetermined one of the one or more optical-transmission parameters enabling the normal transmission, calculates a second value of the characteristic value at a second point out of the range of the predetermined one of the one or more optical-transmission parameters enabling the normal transmission, compares the first value of the predetermined characteristic with an expected value of the predetermined characteristic at the first point, and compares the second value of the predetermined characteristic with an expected value of the predetermined characteristic at a second point, and when the first value of the predetermined characteristic is determined to be identical to the expected value of the predetermined characteristic at the first point and the second value of the predetermined characteristic is determined to be identical to the expected value of the predetermined characteristic at the second point, the performing outputs a notice that the constructed optical network has satisfactory quality.