A method and apparatus for producing an image of a target area, by: at an observation location spaced from the target area, transmitting a beam of electromagnetic radiation toward the target area, and receiving reflections of the radiation from the target area; providing a representation of the magnitude and direction of the distance between points on the target area which produce reflections that travel in phase to the observation location; varying the spatial relation between the observation location and the target area and/or the given radiation frequency, in order to establish a plurality of different observation states which succeed one another in time, each state being associated with a distinct combination of magnitude and direction of the distance between points on the target area which produce reflections that travel in phase to the observation location; producing two coherent radiation beams, directing the two beams onto a receiving plane provided with an array of radiation receiving cells and storing output signals from each receiving cell, and controlling the two beams, for each observation state in succession, such that the two collimated beams have: beam axes which are inclined relative to one another by an angle corresponding in magnitude and direction to the magnitude and direction representations; a phase difference corresponding to the phase difference between the transmitted and received radiation; and intensities such that the product of the intensities of the two beams corresponds to the intensity product of the transmitted and received radiation.

Image synthesis using time sequential holography

A multichip module having high density optical and electrical interconnections between integrated circuit chips includes a substrate overlaying an array of integrated circuit chips. An optical transmitter generates a first optical beam through the substrate and an optical detector receives a second optical beam through the substrate. A hologram is positioned in the path of at least one of the first and second optical beams. An array of electrical contact pads is located on the substrate corresponding to the array of electrical contact pads on the respective integrated circuit chips. A pattern of electrical interconnection lines is located on the substrate for electrically interconnecting the integrated circuit chips. A solder bump between electrical contact pads on the substrate and on the integrated circuit chips establish electrical connections between the substrate and the integrated circuit chips, and also facilitate alignment of the integrated circuit chips with respect to the substrate. The optical transmitter and detector may be mounted on/in the substrate or on/in the integrated circuit chips. The optical transmitter and detector may also be used to provide optical connections external to the microelectronic module, using a holographic substrate to optically link modules. The substrate may also be used to establish optical alignment of the hologram to an underlying optical emitter and/or optical detector without establishing electrical connections thereto.

Microelectronic module having optical and electrical interconnects

An optical memory (10) is disclosed in which data is stored in an optical data layer (19) capable of selectively altering light such as by changeable transmissivity, reflectivity, polarization, and/or phase. The data is illuminated by controllable light sources (15) and an array of multi-surface imaging lenslets (21) project the image onto a common array of light sensors (27). Data is organized into a plurality of regions or patches (called pages) and by selective illumination of each data page, one of the lenslets (21) images the selected data page onto the light sensors (27). Light in the data image pattern strikes different ones of the arrayed light sensors (27), thereby outputting a pattern of binary bits in the form of electrical data signals. By selectively and sequentially illuminating different ones of the data regions (pages) on the data layer (19), correspondingly different data patterns are imaged by the corresponding lenslets (21) onto the common sensor array (27), thereby enabling many stored data pages to be retrieved by multiplexing at electro-optical speed.

Optical random access memory.

A semiconductor integrated circuit device comprising a plurality of semiconductor packaging substrates arranged parallel to one another, a plurality of semiconductor integrated circuits mounted on each of the semiconductor packaging substrates, a circuit for electrically connecting the semiconductor integrated circuits, an optical signal transmitting circuit, electrically connected to the semiconductor integrated circuits, for converting an electric signal input by the semiconductor integrated circuits to an optical signal and outputting it to another semiconductor packaging substrate, and an optical signal receiving circuit, electrically connected to the semiconductor integrated circuits, for receiving the optical signal output from the semiconductor packaging substrate, converting the optical signal to an electric signal, and outputting the electric signal to the semiconductor integrated circuits.

Semiconductor integrated circuit device with optical transmit-receive means

An optical information transmitting device for transmitting information on a light beam emitted by a light source, includes an electronic circuit board, and an optical input/output port mounted on the electronic circuit board. The optical input/output port has a glass substrate attached to the electronic circuit board, a first array of optical sensors for absorbing a portion of a light beam applied thereto from the light source and photoelectrically converting the portion of the light beam, and for transmitting the remainder of the light beam therethrough, and a second array of spatial light modulators for modulating the transmittance with respect to a light beam applied thereto, the first and second arrays being disposed on a surface of the glass substrate in superposed relationship to each other. A motherboard comprises a substrate and a coaxial lens array of lenses spaced at equal intervals along an optical axis on the substrate, with conjugate focusing planes of equal magnification being disposed between adjacent ones of the lenses. A method of manufacturing the motherboard is also disclosed.

Optical information transmitting device and method of manufacturing same

A device for establishing optical connection links between electronic component cards forming part of a package. The device comprises a transparent plate having parallel faces and a light source which emits a divergent beam and is implanted on a first card. The beam is reflected from a first optical diffracting element in the form of a collimated beam which undergoes multiple reflections from alternate reflecting elements to a second optical diffracting element and is converted by the second element to a convergent beam transmitted to a detector which is implanted on a second card.

Device for optical interconnection of electronic component cards within a case and a method of fabrication of said device

An optical bistable photorefractive crystal device is provided in which a photorefractive crystal disposed between two mirrors is uniformly illuminated by a light beam, a signal beam being focused on a given portion of the crystal to cause bistable switching of this portion inside the crystal.

Bistable optical photorefractive crystal device

The object of the invention is to provide a device for storing and selectively erasing information in electrooptical photoconductive materials in which selective recording and erasure are obtained by identical optical devices which project the same distribution of light onto the zone to be recorded and then erased. Recording and erasure differ solely in the direction of the electrical field applied to the material.

Optical device for the storage and the selective erasure of information

According to the invention, the transmissions in a first direction between a first station 1 and a second station 2 are ensured by the transmission E1 and the guiding by an optical connection fibre fl of a light wave O1 of specified wavelength modulated by information SSI1 to be transmitted to the second station 2; and the transmissions in a second direction by the reflecting of a fraction O2 of the transmitted light energy 01 and the modulating of the latter by information SSI2 to be transmitted to the first station 1, this being done with the aid of a modifiable back-reflector ERM2 comprising a liquid crystal cell. The invention applies in particular to teledistribution networks.

Connection system for simultaneous bidirectional transmissions by optical fibre.

A cinematographic film to be reproduced by television is driven at constant speed in synchronism with the sweep cycle of one or more camera tubes each positioned to pick up images projected upon a receiving surface thereof whose luminous persistence equals at least a sweep cycle. The film is periodically transluminated, during the retrace phase of the scanning beam, by a light pulse emitted by an electroluminescent diode -- or by a cluster of such diodes operating on different wavelengths -- defining a quasi-pinpoint light source, the diode being excited by an energizing pulse whose length does not exceed the duration of a line scan of the camera tube.

Jean Pierre Huignard

Papers

Device for optical interconnection of electronic component cards within a case and a method of fabrication of said device

Bistable optical photorefractive crystal device

Optical device for the storage and the selective erasure of information

Connection system for simultaneous bidirectional transmissions by optical fibre.

Telecinema system using electroluminescent diodes