Abstract: A wave meter 1 is a wave meter for measuring and monitoring the wavelength of an optical signal, etc., in WDM transmission. After a monitor reference wave is input and set, the monitor reference wave is always compared with the signal wave being transmitted in WDM, thereby monitoring an anomaly occurring in the optical signal being transmitted in the WDM.

Abstract: A wavemeter for measuring a signal light which is obtained by multiplexing a plurality of optical signals in a predetermined system and which is transmitted, comprises: a reference setting unit for setting a reference value for measurement of the signal light obtained by the predetermined system, a measuring unit for continuously measuring the transmitted signal light, a specifying unit for specifying each optical signal multiplexed into the signal light, in accordance with a result of a measurement carried out by the measuring unit, a variation measuring unit for calculating a variation in a physical value of each optical signal specified by the specifying unit in accordance with the reference value for measurement, and an output unit for outputting a transition of the variation calculated by the variation measuring unit.

Abstract: A wavemeter for measuring a signal light which is obtained by multiplexing a plurality of optical signals in a predetermined system and which is transmitted, comprises: a reference setting unit for setting a reference value for measurement of the signal light obtained by the predetermined system, a measuring unit for continuously measuring the transmitted signal light, a specifying unit for specifying each optical signal multiplexed into the signal light, in accordance with a result of a measurement carried out by the measuring unit, a variation measuring unit for calculating a variation in a physical value of each optical signal specified by the specifying unit in accordance with the reference value for measurement, and an output unit for outputting a transition of the variation calculated by the variation measuring unit.

Abstract: There is provided a method, an apparatus and computer program product for the classification of measured data from a multi-core optical fiber, wherein even with event points which are difficult to distinguish or with identical event points and when there are deviations in distances between event points, connection losses and the like for all event points can be classified. Measured waveform data measured using an OTDR apparatus is read in. Then level differences with connection losses which coincide or exceed a predetermined threshold value are identified as event points, and the event information related to the event points is obtained. Next the event information related to the head core optical fiber is registered in a master file. Then an interval distance between adjacent event points registered in the master file is obtained.

Abstract: An optical power meter which is capable of performing power range switchover operations in short periods of time and are capable of performing optical power measurements over a wide range in short periods of time. The invention comprises a photodiode 101 which outputs an electrical current proportional to the input optical power, an I/V amp 102 which converts this electrical current into voltage, a variable-gain amp 103 for amplifying this voltage, an A/D converter 107 which converts the output voltage from this variable-gain amp into a digital signal, a CPU 110 which processes the digital signal outputted from this A/D converter 107, and saturation detecting comparators 108 and 109 which detect saturation of the I/V amp and the variable-gain amp. The CPU 110 switches the gains of the I/V amp and the variable-gain amp based on the output signals from the saturation detecting comparators.