HOLOGRAPHIC GRATING SPECTRUM ANALYZER

摘要

A spectrum analyzer providing an integrated calibration function and for providing that calibration function automatically. The injection of light to be analyzed through a central aperture (14) of a scanning grating (12) onto a focusing reflector (16) provides in combination four traversals of the space therebetween. The spectrometer thus is used to separate wavelength information spacially and receive it back at the same or adjacent aperture(s) (14) to be analyzed by a processing system (50) to establish the spectra for the incident light. The light is typically injected from and received back into optical fibers (42, 46) or other light carrying elements. Calibration light is also applied through the same or adjacent apertures (14) in the grating (12) from a known source and spectra such as Argon to use as a calibration reference by detecting the known spectra peaks and correlating it to grating scan angle. The same structure is also used as a telecommunications channel router.