| 摘要 |
<p>An object of this invention is to provide a compact and low-cost optical wavelength measuring instrument, in which mechanical movements are eliminated to improve reliability, measuring speed and measuring accuracy. The optical wavelength measuring instrument utilizes a group delay dispersion medium having wavelength dependence. Light to be measured is introduced to an optical modulator (1) for intensity modulation using a reference signal from a signal source (2). The modulated light is passed through the group delay dispersion medium (3) so as to provide a delay corresponding to the wavelength, and converted to an electric signal by a photoelectric convertor (4). A phase difference between the reference signal and this electric signal is determined by a phase comparator (5) so as to convert the wavelength of light to be measured. The wavelength of light to be measured can be converted by using another reference signal, such as reference light, to which the same optical intensity modulation and the same delay are applied, or delayed light to be measured.</p> |
