Abstract:
An optical data storage system and method of use thereof are presented. The optical data storage system includes one or more optical buffer modules connected in series. Each optical buffer module includes a cross connect. Each cross connect is connected, by a pair of inputs and outputs, to an optical data storage unit, for example, a fiber delay line, by a pair to either an optical packet network or a cross connect of a first adjacent buffer module in the series, and by a pair to a cross connect of a second adjacent buffer module in the series. The buffer module also includes a read signal output line which is connected to a read signal input line of the second adjacent buffer module for transmitting a read signal. A control module within each buffer module directs the passage of data through the cross connect.
Abstract:
A method and apparatus for enhancing the receiving and information identification functions of multiple access communications systems by employing one or more optical processors configured as a bank of 1-D correlators. The present invention is particularly useful in a DS/SS CDMA communications system, resulting in a multiuser CDMA system that approaches carrier to noise performance (C/N) as opposed to being limited by multiple access interference (MAI). The correlators are arranged in parallel to detect and/or demodulate the received signal, in conjunction with one or more complex algorithms to perform near-optimum multiuser detection, perform multipath combining and/or perform carrier Doppler compensation. An improved receiver in accordance with the present invention comprises means for receiving a plurality of signals transmitted through a communications channel; signal conversion means for converting the received signals into a form suitable for input to the multichannel correlator; a multichannel optical correlator for identifying the presence of particular waveforms and estimating the relative time delay or delays, carrier frequency offset from expected, RF amplitude and RF phase for each received spread spectrum waveform present in the received plurality of signals; a controller for determining and providing to the optical correlator the appropriate set of reference hypotheses; and one or more receiver algorithms depending on the exact receiver function to be performed.
Abstract:
A method for encoding a data symbol vector in an OFDM symbol and decoding an OFDM symbol to recover a data symbol vector encoded therein, the method comprising: receiving a vector of values; generating at least one input spatial light pattern responsive to the vector; generating for each input spatial light pattern an output spatial light pattern that is an interference pattern produced by light from the input spatial light pattern; sensing the output spatial light pattern at discrete spatial points and generating signals responsive to the sensed light; and if the vector represents a data symbol vector, using the signals to encode the data symbol vector in an OFDM signal and if the vector represents an OFDM symbol, using the signals to recover a data symbol vector encoded in the OFDM symbol.
Abstract:
Optical apparatus for obtaining a discrete transform of an input signal in an output plane, the system comprising: a light source positioned at an input surface, the source comprising an array of N spaced temporally coherent, spatially incoherent light elements representative of the signal, spaced with a first spacing; a detector positioned at an output surface, the detector comprising an array of N spaced detectors, spaced with a second spacing, such that it N samples light at the output surface; and an optical transformer that collects light from the light source and transforms it into a pattern at the output surface, said optical transformer being constructed such, such that the N sampling of the output signal results in the discrete transform of the input signal, wherein said optical transformer includes a shearing generator that provides two images of the light source that are inverted forms of each other, interference between said images providing a continuous interference pattern that is sampled by said detector.
Abstract:
In one example, a composite processor (100) includes a circuit board (1200), a first processor element package (1230), and a second processor element package (1240). The circuit board has an optical link (1211) and an electrical link (1221). The first processor element package (1230) includes a substrate (1231) with an integrated circuit (240), a sub-wavelength grating optical coupler (1232), and an electrical coupler (1233) coupled to the electrical link (1221) of the circuit board (1200). The second processor element package (1240) includes a substrate (1241) with an integrated circuit (240), a sub-wavelength grating optical coupler (1242), and an electrical coupler (1243) coupled to the electrical link (1221) of the circuit board (1220). The sub-wavelength grating optical coupler (1232) of the first processor element package (1230), the optical link (1211) of the circuit board (1220), and the sub-wavelength grating optical coupler (1242) of the second processor element package (1240) collectively define an optical communications path (1270) between the substrate (1231) of the first processor element package (1230) and the substrate (1241) of the second processor element package (1240).
Abstract:
This invention relates to a pattern recognition correlator and method for correlating input data with one or more reference data sets. The input data, which may be for instance digital amplitude modulated optical data, is used to modulate an optical signal to form a phase modulated optical signal. This temporal phase modulated optical signal is then converted into a parallel optical phase signal, preferably through use of an optical delay, and modulated by an optical phase modulator. When there is a correlation between the input data and the reference data the emerging wavefront is plane and can be strongly coupled to a detector. In the absence of correlation the emergent wavefront is not plane and so is not coupled as strongly to the detector. The detector output can therefore be used as an indication of correlation.
Abstract:
A system of information processing includes a processor that has lasing material configured to route an input along a pathway formed within the material. The input follows the pathway and results in a particular desired output, wherein the input is determined and calculated based on the particular output received by the processor, and the pathway forms a logic circuit within the processor.
Abstract:
A studied (9) and a reference (10) images arranged on the reference plane (8) of a first optical system (2) are illuminated by two reference converging or diverging plane monochromatic waves emitted at specified equal angles with respect to an optical axis. The joint fractional Fourier transformation of images is carried out in the first single-lens or double-lens optical system (2) at the asymmetric position of the reference (8) and an exit (13) planes with respect to the lenses and satisfying the following condition: BFFT=a22b-a12Fsin theta =0, wherein a22, a12 are invariant parameters of the optical system of the joint fractional Fourier transformation; 2b is a reference distance between the initial studied (9) and the reference (10) images, F is the focal length of a lens which carries out the fractional Fourier transformation; theta ref is the angle of incidence of a flat monochromatic wave. The interference pattern of the joint fractional Fourier transformation at a determined spatial frequency is recorded on a photosensitive medium (12) in the exit plane (13), the Fourier transformation of said interference pattern is carried out in another optical system (3), a correlation field containing autocorrelative functions of the images which are formed in 0 diffraction order and cross-correlation images which are formed in diffraction orders being recorded.