Lockheed Martin Corporation

Unisys Corporation

Sperry Corporation

Sperry Rand Corporation

John A Krawczak

Ernest J Torok

Rick C Stevens

Bernard S Fritz

Brian L Uhlhorn

Gerald F Sauter

Maynard C Paul

Gregory J Whaley

Steven Allen Murphy

William A Harvey

Alan D Kaske

Raymond J Johnson

A number of electro-optic modulation systems, apparatuses, and methods are disclosed. For example, one radio frequency photonic link with differential drive to an optical resonator electro-optic modulator includes an optically resonant body having a surface for receiving an optical carrier beam, a first electrode for receiving a first electrical signal to the resonator body, and a second electrode for receiving a second electrical signal to the resonator body that is different than the first electrical signal.

Radio frequency photonic link with differential drive to an optical resonator electro-optic modulator

Methods, systems, and devices are provided for an electrooptical modulator. One method embodiment includes receiving an optical input signal to an electrooptical modulator. A first voltage input is applied to a first drive electrode associated with a first optical path in the electrooptical modulator. A second voltage input is applied to a second drive electrode associated with a second optical path in the electrooptical modulator at times alternative to applying the first voltage input to the first drive electrode.

Range extended electrooptic modulator

The present disclosure is directed to an optical apparatus suitable for coupling to an optical network. The optical apparatus is adapted to transmit multiplexed optical signals on the optical network and/or de-multiplex optical transmissions from the network. The optical apparatus includes an optical waveguide and an optoelectronic device. The optical waveguide has a set of diffractive elements in the form of a scribed volume hologram, which provides an optical transfer function. The optical waveguide also includes a first optical port and a second optical port. The second optical port is adapted to be optically coupled to the optical network. The optoelectronic device includes a plurality of optical portions. The optoelectronic device is adapted to convert optical signals at the optical portions into electric signals and/or convert electric signals into optical signals at the optical portions.

Integrated volume holographic optical circuit apparatus

A multi-node Scalable Coherent Interface ring for the transmission of packets between nodes, each of which contains an SCI link controller to which a B-link controller that contains a timer is coupled and a gigabit transceiver to which a G-link controller that contains a timer is coupled, is provided. The SCI link controller, the B-link controller and the G-link controller are utilized to allow the SCI link controller and the transceivers to be initialized and synchronized in a manner such that these devices may be utilized in a multi-node SCI packet network.

Multi-node interconnect topology with nodes containing SCI link

An apparatus and method for simultaneous transmission of a multiplicity of independent optical data signals without having to precisely align each source of the optical data signals with a single fiber-optic strand including an emitter array for emitting a multiplicity of optical data signals onto one end face of a coherent fiber-optic bundle having a plurality of fiber-optic strands bundled in a contiguous arrangement; and a photodiode array having optical data signals receiving area with the receiving area having a minimum dimension at least as large as a second end of the plurality of fiber-optic strands to enable the optical data signals to travel from the emitter to the photodiode receiving area over one or more of the plurality of fiber-optic strands.

Apparatus and method for transmitting optical data

The present invention utilizes the advantages of a switching regulator, such as, for example, the one shown in the National Semiconductor September 1992 publication, without the addition of additional complex control circuitry to provide a highly efficient controller for controlling the average optical output from a laser diode.

Switching regulator control for a laser diode

A signal processing circuit that is subject to signal chatter is provided with signal chatter-elimination circuitry. Prior signal processing circuitry included a peak voltage detector which received a data input signal and provided a peak voltage representation of the input signal and a threshold-comparator that provided a threshold-comparison signal of a first output voltage magnitude when the peak voltage representation was below a predefined threshold voltage and of a second output voltage magnitude when the peak voltage representation was above the predefined threshold voltage. Improved signal chatter elimination is achieved by the further incorporation of a differential operational amplifier that has (a) a first input terminal that receives a data-representative signal which is subject to signal chatter, (b) a second input terminal that is coupled to receive a threshold-comparison signal of either a first fixed voltage level that blocks the output signal, or of a second variable voltage level that allows the output signal to be provided by the amplifier, and (c) a source of second variable voltage level which is temperature compensated, and the further incorporation of a threshold-level switch coupled to the threshold-comparator to receive the threshold comparison signal and to the amplifier, wherein the threshold-level switch is constructed to supply the first fixed voltage level to the second input terminal when the input signal is below the threshold voltage and the second voltage level to the second input terminal when the input signal is above the threshold voltage.

Circuit to eliminate signal chatter in the output of a fiber-optic

A fiber-optic switchboard is developed consisting of a plurality of n input fibers, n input lenses, n light deflecting elements, n relay lenses, a multifaceted reflector, m output lenses, and m output fibers. Each input lens causes an image of the end of the corresponding input fiber to fall on its deflecting element, while each relay lens causes an image of the corresponding deflector element to fall on the proper facet of the multifaceted reflector. Each output lens causes an image of the multifaceted reflector to fall on the face of the corresponding output fiber. The output lenses are placed such that each deflecting element is capable of directing light through any output lens and into the corresponding output fiber.

Integrated solid state non-volatile fiber optic switchboard

Disclosed is an apparatus for and a method of establishing the domain walls within a stripe-domain supporting magnetizable film in a radially directed orientation, the separation of which is proportional to the distance from the center of the diffraction grating. The apparatus includes means for coupling to the stripe-domain supporting magnetizable film an orienting field that is directed orthogonal to the plane of the film but whose intensity from the center of the field source is inversely proportional to the distance from the center of the field source and further including means for coupling to said film an AC tickle field of significant to decreasing to zero amplitude for overcoming the hysteresis of the film.

Image rotating diffraction grating

An apparatus for and a method of providing an amplified, directable laser light beam is disclosed. The apparatus includes two optical cavities sharing a common mirror. The first cavity is resonant and contains a laser rod intermediate a high reflectivity reflecting mirror of 100% reflectivity and a low reflectivity transmitting mirror of 10-90% reflectivity. The second cavity is antiresonant and contains a Faraday effect diffraction grating intermediate the low reflectivity mirror and a 100% reflectivity mirror. The laser light beam that passes through the transmitting mirror is directed normally incident to the surface of and passes through the Faraday effect diffraction grating. On the far side of the diffraction grating is a mirror of 100% reflectivity, which reflects the laser light beam back through the diffraction grating forming a pair of diffracted congruent 1'st order light beams and a single undiffracted 0'th order light beam. The 0'th order light beam is directed back through the transmitting mirror, through the laser rod to be reflected between its reflecting and transmitting mirrors and to again pass through the transmitting mirror onto the diffraction grating to provide 1'st order light beams of increased intensity.

Multipass laser optics for light deflector

A method of and an apparatus for reading out the information that is stored in the magnetizable layer of a cross-tie wall memory system is disclosed. The apparatus utilizes: a conductive pillar that is centered over and is conductively coupled to the Bloch-line position in the memory segment of the cross-tie wall in the magnetizable layer; a conductive ring that is oriented concentric to the pillar and that is conductively coupled to the magnetizable layer; and a readout device that is coupled across the pillar and ring for determining the resistance in the magnetizable layer between the pillar and ring as an indication of the existence or not of a Bloch-line in the memory segment.

Growing community of inventors

Minnetonka, MN, United States of America

John A Krawczak