| 摘要 |
The scale and complexity of an apparatus is reduced by omitting a clock extraction section. The apparatus includes: a sampling pulse train generation device (13, 23, 33) which generates an optical or electrical sampling pulse train, independently of an input optical or electrical data signal with a bit rate ’ 0 ( bit / s ), and which has a repetition frequency ’ 1 ( Hz ) which differs from the bit rate ’ 0 ( bit / s ); a data signal sampling device (12, 22, 32) which samples the data signal with a bit rate ’ 0 ( bit / s ) in accordance with the sampling pulse train to obtain a sampled signal; a voltage retaining device (14) which converts the sampled signal which is an optical or electrical sampled signal obtained by the data signal sampling device, and stores a plurality of pieces of data as electrical digital data; an electrical signal processing device (16) which reads the plurality of pieces of the electrical digital data stored in the voltage retaining device at once or sequentially to obtain a signal eye-diagram and evaluates optical data signal quality parameters; and a trigger signal generation device (15) which applies triggers indicating the start/finish of data acquisition to the voltage retaining device, and applies triggers indicating the start/finish of data read to the electrical signal processing device (16). |
