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"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 7105820 | Terahertz imaging for near field objects Near field imaging using a THz imaging system is realized by utilizing an interferometric imaging detector array that includes detector elements disposed on a surface curved, physically or artificially, to match substantially the curvature of the wave front for rece... | 09/12/2006 |
| 7082834 | Flexible thin film pressure sensor Low pressure sensing and imperviousness to corrosion and to the effects of harsh environments are achieved in a pressure sensor that employs a flexible membrane supporting piezoresistive elements. A plurality of piezoresistive elements are aligned substantially coll... | 08/01/2006 |
| 6069732 | Semiconductor interferometric optical wavelength conversion device An interferometer having semiconductor optical amplifiers in one or both arms of the interferometer converts information from a first wavelength to another predetermined wavelength. The original data signal (at the first wavelength) is coupled into the in... | 05/30/2000 |
| 5745512 | Tunable lasers based on absorbers in standing waves A tunable laser whose lasing frequency can be changed by varying the absorbance of absorber layers that are preceding a standing wave of the laser cavity. Changes in the absorbance of the layers are accomplished by varying the strength of the absorber lay... | 04/28/1998 |
| 5627854 | Saturable bragg reflector Low optical loss and simplified fabrication are achieved by a nonlinear reflector which incorporates one or more semiconductor quantum wells within a standard semiconductor quarter wave stack reflector. The nonlinear reflector provides an intensity depend... | 05/06/1997 |
| 5623145 | Method and apparatus for terahertz imaging Certain material and objects can be characterized by a frequency-dependent absorption, dispersion, and reflection of terahertz transients in signals which pass illuminate the material or object. The present terahertz imaging system analyses that frequency... | 04/22/1997 |
| 5477368 | High power lightwave transmitter using highly saturated amplifier for residual AM suppression Stimulated Brillouin scattering has been effectively suppressed and the effect of residual amplitude modulation has been mitigated in a dithered optical transmitter by injecting the dithered optical signal into an optical device, such as a highly saturate... | 12/19/1995 |
| 5473458 | Soliton data transmission using non-soliton transmitter Method and apparatus of soliton transmission using a non-soliton source are described. The soliton transmission is generally in the form of an optical pulse sequence, Intensity and phase modulation of a continuous wave optical signal generates a pair of o... | 12/05/1995 |
| 5444725 | Multifrequency laser A tunable laser capable of high speed operation is realized by modifying a tunable laser incorporating an N×N wavelength grating router to have an output waveguide positioned for capturing second order diffraction optical energy from the router free-spac... | 08/22/1995 |
| 5436756 | Suppressed photocurrent, quantum well optical modulation device Photocurrent suppression is achieved without deleteriously affecting modulation performance in a surface normal, electro-absorption, quantum well modulator by introducing a sufficient number of non-radiative recombination centers in the quantum well regio... | 07/25/1995 |
| 5412565 | Electronic synapse circuit for artificial neural network An electronic synapse circuit is disclosed for multiplying an analog weight signal value by a digital state signal value to achieve a signed product value as a current which is capable of being summed with other such synapse circuit outputs. The circuit e... | 05/02/1995 |
| 5412754 | Reverse time delay neural network for pattern generation Trajectories are generated in response to an input label by using a reverse time delay neural network. The reverse time delay neural network comprises an input layer, a plurality of hidden layers, and an output layer, all arranged in succession so that th... | 05/02/1995 |
| 5357364 | Soliton transmission system having sliding-frequency guiding filters Timing jitter problems are effectively eliminated in a soliton transmission system realized in accordance with the principles of the present invention by deploying optical filters whose center frequency intentionally differs from the center frequency of a... | 10/18/1994 |
| 5333219 | Asymmetric Y-branch optical device The present invention relates to a new tunable filter which, when used as an intracavity mode selecting filter in a semiconductor laser structure, provides a large tuning range. The disclosed filter is, in one embodiment, a two branch asymmetric Y-branch ... | 07/26/1994 |
| 5311344 | Bidirectional lightwave transmission system Bidirectional, non-interfering transmission of broadband services on a single fiber is accomplished by simultaneously combining wavelength-division, time-division, and subcarrier multiplexing on the downstream and upstream transmissions. High speed electr... | 05/10/1994 |
| 5303079 | Tunable chirp, lightwave modulator for dispersion compensation External modulation is accomplished in a dual waveguide device wherein substantially identical input optical beams are supplied to the waveguides and wherein each waveguide through its electrode is subject to individual, mutually exclusive control. Modula... | 04/12/1994 |
| 5288659 | Photonic-integrated-circuit fabrication process An improved process for fabricating photonic circuits is disclosed. The inventive process starts with a growth of a base wafer comprising a stack of epitaxial layers of various materials. At least a portion of each of the material layers will ultimately b... | 02/22/1994 |
| 5278855 | Broadband semiconductor saturable absorber Extended wavelength tunability is achieved in a saturable absorber for applications such as modelocking lasers by realizing a semiconductor structure having a tapered energy bandgap profile in a portion of the saturable absorber wherein the profile is giv... | 01/11/1994 |
| 5274748 | Electronic synapse circuit for artificial neural network An electronic synapse circuit is disclosed for multiplying an analog weight signal value by a digital state signal value to achieve a signed product value as a current which is capable of being summed with other such synapse circuit outputs. The circuit e... | 12/28/1993 |
| 5271090 | Operational speed improvement for neural network Higher operational speed is obtained without sacrificing computational accuracy and reliability in a neural network by interchanging a computationally complex nonlinear function with a similar but less complex nonlinear function in each neuron or computat... | 12/14/1993 |
| 5258946 | Content-addressable memory A measure of the correlation or degree of closeness between an input data pattern and a stored data pattern is achieved directly from content-addressable memory cells which are realized in accordance with the principles of the present invention to provide... | 11/02/1993 |
| 5255265 | Controller for input-queued packet switch Significant throughput improvement is achieved for an input queued packet switch using output port schedulers by permitting the output schedulers to recycle or reassign cell transmission times from input ports which are unable to use them. When an output ... | 10/19/1993 |
| 5243669 | Asymmetric, periodically loaded waveguide for polarization rotation Polarization rotation is achieved in an exemplary embodiment in an optical waveguide by augmenting the waveguide structure with a plurality of spaced-apart sections for loading the refractive index of the waveguide to cause a lateral asymmetry in the refr... | 09/07/1993 |
| 5241414 | Fault tolerant optical amplifier arrangement For a group of optical amplifiers, pump beams from an array of lasers are mixed together to form a plurality of composite pump beams. Each composite pump beam is distributed to the pump port of a particular optical amplifier. The composite pump beam impro... | 08/31/1993 |
| 5220578 | Long term mode stabilization for distributed Bragg reflector laser A light transmitter comprising a distributed Bragg reflector laser and mode stabilization feedback means is described for maintaining the laser in single longitudinal mode operation.... | 06/15/1993 |
| 5220325 | Hierarchical variable length decoder for digital video data Efficient decoding of an hierarchical, variable length, encoded data sequence containing embedded uncoded data into a sequence of fixed length instructions for subsequent processing by a digital video processor or the like is realized in an apparatus incl... | 06/15/1993 |
| 5212743 | Automatic polarization controller having broadband, reset-free operation Wide optical bandwidth and broad wavelength tuning range are achieved in a reset-free, optical, automatic polarization controller by combining three controllable fractional wave elements in cascade and further by controlling the orientations of both outer... | 05/18/1993 |
| 5210428 | Semiconductor device having shallow quantum well region Carriers are permitted escape from quantum wells within a semiconductor device in the minimum amount of time by utilizing semiconductor material in the barrier layers around the quantum well wherein the barrier layers exhibit an effective bandgap energy l... | 05/11/1993 |
| 5187610 | Low noise, optical amplifier having post-amplification loss element In an optical arrangement for amplifying an input lightwave signal by a predetermined amount to a desired output level, an optical amplifier is connected to a loss element. The optical amplifier is pumped by an amount exceeding a nominal amount wherein th... | 02/16/1993 |
| 5185827 | Apparatus for compensating chromatic dispersion in optical fibers Chromatic dispersion is efficiently compensated in a compact device by combining a spatial mode converter with a dispersive waveguide having a dispersion characteristic of substantially equivalent magnitude, and opposite sign, to the desired amount of dis... | 02/09/1993 |
| 5106783 | Process for fabricating semiconductor devices with self-aligned contacts A novel process is disclosed for fabricating semiconductor devices with self-aligned contacts. Characteristic of the resulting structure is a digitated electrode and a contiguous conductive region that contact first semiconductor regions and second semico... | 04/21/1992 |
| 5105468 | Time delay neural network for printed and cursive handwritten character recognition A time delay neural network is defined having feature detection layers which are constrained for extracting features and subsampling a sequence of feature vectors input to the particular feature detection layer. Output from the network for both digit and ... | 04/14/1992 |
| 5101456 | Predistortion apparatus for optical logic device Timing restrictions for coincidence of control and data signal pulses to a soliton-based optical logic device are significantly relaxed by predistorting a characteristic of data signal pulses input to the device. Predistortion in the form of normal disper... | 03/31/1992 |
| 5101291 | Optical frequency conversion device An optical apparatus for generating an optical frequency comb from an optical input signal is realized by transmitting the optical signal through an optical circuit comprising an optical amplifier and a Bragg cell configured in an optical cavity. By align... | 03/31/1992 |
| 5093695 | Controllable semiconductor modulator having interleaved contacts In a semiconductor optical modulator, two semiconductor materials having different refractive indices are grown in an alternating sequence of layers to form a semiconductor mirror wherein each layer has approximately a quarter wave thickness for a predete... | 03/03/1992 |
| 5093900 | Reconfigurable neural network Realization of a reconfigurable neuron for use in a neural network has been achieved using analog techniques. In the reconfigurable neuron, digital input data are multiplied by programmable digital weights in a novel connection structure whose output perm... | 03/03/1992 |
| 5090790 | Polarization-independent semiconductor waveguide A polarization independent guided wave semiconductor device is realized wherein the waveguide region of the device includes one or more strained quantum well layers wherein strain is designed to be tensile in nature so that energy subbands in the quantum ... | 02/25/1992 |
| 5091916 | Distributed reflector laser having improved side mode suppression Improved side mode suppression with significantly reduced side mode suppression ratio fluctuation during laser tuning is realized in a distributed Bragg reflector laser structure by incorporating at least one reflector element which exhibits an asymmetric... | 02/25/1992 |
| 5078464 | Optical logic device An optical logic device based on the time-shift-keying architecture is described in which digital logic functions are realized by applying appropriate signal pulses to a nonlinear shift or "chirp" element whose output is supplied to a dispersive element c... | 01/07/1992 |
| 5068877 | Method for synchronizing interconnected digital equipment Optimized synchronization planning and clock distribution for a network of interconnected digital equipment is achieved by designating a network node at the highest stratum level as the master clock node, forming a group of all unassigned nodes connected ... | 11/26/1991 |
