Patent ID: 8462338

Claim:
A wavelength multiplexer/demultiplexer/compact spectrometer device suitable for analyzing a spectra composition of an optical beam, the device enabling a dispersion of light spectra around a particular wavelength λ c , the device comprising: an input slit for allowing an entry of the optical beam into the device, a location of the input slit being adjustable, and further the location of the input slit X in specified by a first input angle θ 1 that is defined between a line joining the input slit to a center of a curved grating and a normal of the grating center of the curved grating and a first input distance S 1 from the grating center to the input slit; and a first output slit for allowing the exiting of a first output optical beam having a first output wavelength λ 1 , a location of the first output slit being adjustable, and further the location of the first output slit specified by a first output angle θ 2 that is defined between a line joining the first output slit to the center of the curved grating and the normal of the center of the curved grating and a first output distance S 2 from the grating center to the first output slit; wherein the curved grating processes the spectra compositions of the optical beam, the curved grating comprising a plurality of grooves, wherein a position of each of the plurality of grooves is adjustable for controlling a performance of the device, such that a path difference between two adjacent grooves is an integral of the center of operation wavelength.