Optical vector matrix multipliers
Improved optical vector matrix multipliers are disclosed. The multipliers comprise: a plurality of light sources, each operable to radiate light of intensity u i ; fan-out optics arranged to expand the light radiated by the light sources in one dimension; a spatial light modulator comprising a plurality of light modulating zones, each zone receiving light from one of the light sources and being operable to modulate the intensity of said received light by a factor of v ij ; and fan-in optics arranged to focus the modulated light onto a plurality of light detectors. The fan out optics, spatial light modulator, and fan-in optics are arranged such that an intensity of light proportional to ∑ i u i v ij is received at each light detector; and the fan-out optics comprise guided-wave optical components. Specific embodiments are disclosed in which the fanout optics comprise optical splitters, or a partially guiding wedge prism.
1. An optical vector matrix multiplier comprising:
a plurality of light sources, each operable to radiate light of intensity u i ;
fan-out optics arranged to expand the light radiated by the light sources in one dimension;
a spatial light modulator comprising a plurality of light modulating zones, each zone receiving light from one of the light sources and being operable to modulate the intensity of said received light by a factor of v ij ; and
fan-in optics arranged to focus the modulated light onto a plurality of light detectors
wherein the fan out optics, spatial light modulator, and fan-in optics are arranged such that an intensity of light proportional to
∑
i
u
i
v
ij
is received at each light detector; and wherein the fan-out optics comprise guided-wave optical components, and
wherein the fan-out optics comprise a partially-guiding wedge plate.
2. The optical vector matrix multiplier as claimed in claim 1 , wherein the fan-out optics further comprise an anamorphic beam expander positioned between the partially-guiding wedge plate and the plurality of light sources.
3. The optical vector matrix multiplier as claimed in claim 1 , wherein light radiated from the light sources is collimated prior to entering the fan-out optics.
4. The optical vector matrix multiplier as claimed in claim 1 , wherein the spatial light modulator is configured to receive light from the partially-guiding wedge plate, and to reflect light back into the partially-guiding wedge plate.
5. The optical vector matrix multiplier as claimed in claim 4 , wherein the spatial light modulator and the partially guiding-wedge plate are configured such that light reflected back into the partially guiding wedge plate traverses the plate and exits the plate to be received by the fan-in optics.
6. The optical vector matrix multiplier as claimed in claim 1 , wherein the fan-in optics comprise a cylindrical lens.
7. The optical vector matrix multiplier as claimed in claim 1 , wherein the plurality of light sources comprises a plurality of vertical cavity surface emitting lasers.