High resolution digital optical encoder/decoder
View Patent ↗A programmable encoder is provided that includes at least one optical input for receiving a modulated broadband optical signal and at least one optical output. A dispersion element receives the optical signal from the optical input and spatially separates the optical signal into a plurality of wavelength components. A collimating element is provided for collimating the plurality of wavelength components. An actuatable optical arrangement receives the collimated plurality of wavelength components from the collimating element. The actuatable optical arrangement includes a digital micromirror device (DMD) from which a programmably selected subset of wavelength components are reflected at least twice before being directed to a selected one of optical outputs to thereby encode the CDMA signal.
1. A programmable encoder, comprising:
at least one optical input for receiving a modulated broadband optical signal;
at least one optical output;
a dispersion element receiving the optical signal from the optical input and spatially separating the optical signal into a plurality of wavelength components;
a collimating element for collimating the plurality of wavelength components; and
an actuatable optical arrangement receiving the collimated plurality of wavelength components from the collimating element, said actuatable optical arrangement including a digital micromirror device (DMD) from which a programmably selected subset of wavelength components are reflected at least once off of two different portions of the DMD before being directed to a selected one of optical outputs to thereby encode a CDMA signal, wherein the DMD receives the collimated plurality of wavelength components, said DMD having an array of individually actuatable mirror elements for selectively reflecting the wavelength components, and wherein the actuatable optical arrangement further includes an optical element for receiving the reflected wavelength components from the DMD and directing them back onto selected ones of the mirror elements of the DMD, the optical element including a plurality of planar mirrors having reflective surfaces that face reflective surfaces of the mirror elements of the DMD, the planar mirrors being parallel to a mirror surface of the DMD when its mirror elements are in an off or float state.
2. The programmable encoder of claim 1 wherein the at least one optical output is at least two optical outputs.
3. The programmable encoder of claim 1 wherein the plurality of planar mirrors are integrated with the DMD to form a single monolithic assembly.