| 摘要 |
<p>Provided in the present invention are a spectrum domain interference apparatus and a spectrum domain interference method. The spectrum domain interference apparatus comprises: a laser source which emits light with a fixed longitudinal mode frequency width in a fixed frequency band; a fiber Bragg grating filter which receives the light from the laser source in order to penetrate longitudinal modes selected by a free spectral range (FSR) larger than the longitudinal mode frequency width; an interferometer which receives light from the fiber Bragg grating filter in order to provide interference light with an optical path difference due to different optical paths; a spectrum analyzer which receives the interference light from the interferometer in order to decompose and measure the interference light according to frequencies; and a signal processing unit which extracts a spectral cycle of an interference signal according to frequencies using the interference signal of the spectrum analyzer, and extracts an optical path difference provided by the interferometer using the spectral cycle.</p> |
