| 摘要 |
A device for selecting a light source among a plurality of light sources, for measuring the wavelength characteristics of an optical element comprises: a signal source which generates a modulating signal; a change-over switch connected to the signal source; a plurality of light sources different from each other in wavelength, connected to the outputs of the change-over switch; a coupler coupling the respective outputs of the light sources; a detector for detecting the respective outputs of the light sources; a filter which passes only a component of the output of the detector corresponding to the modulated optical output of a selected light source; and an indicator for indicating the measured wavelength characteristics of a measured optical element. The change-over switch is operated to selectively connect the signal source to a selected light source to modulate the optical output of the selected light source by the modulating signal of the signal source. The optical output of the detector is filtered by the filter to pass only a component corresponding to the modulated optical output of the selected light source.
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