子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 201 | All optical logic using cross-phase modulation amplifiers and mach-zehnder interferometers with phase-shift devices | US09682283 | 2001-08-14 | US06522462B2 | 2003-02-18 | Tzu-Yih Chu; Shyang Chang; Chi Au; Abraham C. Ma |
| Optical logic gates are constructed from Mach-Zehnder Interferometer (MZI) optical circuits. A multi-mode interference (MMI) splitter divides a continuous-wave input into two branches of the interferometer. Each branch has a semiconductor optical amplifier (SOA). When a logic input having a logic-high power level is applied to one of the SOA's, cross-phase modulation occurs in the SOA. The phase shift increases through the SOA. The branch coupled to the logic input has a relative phase shift of &pgr; compared with the other branch. When two branches with the &pgr; phase difference are combined, destructive interference occurs, producing a logic low. An MMI combiner or an equivalent phase shifter is used to combine the two branches. The MMI splitter adds a phase shift of &pgr;/2 to the upper branch but not to the lower branch, while the MMI combiner also adds &pgr;/2 shifts. | ||||||
| 202 | Refractive index manipulating optical inverter | US09840858 | 2001-04-24 | US06515784B2 | 2003-02-04 | Juan C. Carillo, Jr.; Bruce A. Ferguson; Richard A. Fields; Mark Kintis; Elizabeth T. Kunkee; Lawrence J. Lembo; Stephen R. Perkins; David L. Rollins; Eric L. Upton |
| An optical inverting system employs a first optical structure having an index of refraction that varies with the intensity of an incident beam and a second optical structure having a constant index of refraction, and forming an interface therebetween. An optical pulse stream is combined with a laser beam and the combined beam is applied to the first optical structure, impinging the interface at a predetermined angle of incidence. If the angle of incidence is less than a critical angle, the beam is refracted into the second optical structure. If the angle of incidence is greater than the critical angle, the beam is completely reflected at the interface. Thus the output of the second optical structure is an inversion, and the output of the first optical structure is a level shifted replica, of the optical digital pulse stream. | ||||||
| 203 | ALL OPTICAL LOGIC USING CROSS-PHASE MODULATION AMPLIFIERS AND MACH-ZEHNDER INTERFEROMETERS WITH PHASE-SHIFT DEVICES | US09682283 | 2001-08-14 | US20030002797A1 | 2003-01-02 | Tzu-Yih Chu; Shyang Chang; Chi Au; Abraham C. Ma |
| Optical logic gates are constructed from Mach-Zehnder interferometer (MZI) optical circuits. A multi-mode interference (MMI) splitter divides a continuous-wave input into two branches of the interferometer. Each branch has a semiconductor optical amplifier (SOA). When a logic input having a logic-high power level is applied to one of the SOA's, cross-phase modulation occurs in the SOA. The phase shift increases through the SOA. The branch coupled to the logic input has a relative phase shift of null compared with the other branch. When two branches with the null phase difference are combined, destructive interference occurs, producing a logic low. An MMI combiner or an equivalent phase shifter is used to combine the two branches. The MMI splitter adds a phase shift of null/2 to the upper branch but not to the lower branch, while the MMI combiner also adds null/2 shifts. | ||||||
| 204 | Coupler-based programmable phase logic device | US09671970 | 2000-09-29 | US06483614B1 | 2002-11-19 | Charles Christopher Romaniuk |
| A coupler-based programmable phase logic device operates using coherent optical or microwave signals. The device is composed of a mixing stage and a logic stage and utilizes 3-port and 4-port couplers, such as integrated optic non-3dB Y-branches and integrated optic directional couplers. The device receives two coherent data input signals and three coherent control input signals and produces a coherent phase modulated data output signal. The data input signals are externally phase modulated to have one of two relative phase values, as in the binary phase shift keying (BPSK) method The data output signal is a phase modulated signal having one of the two relative phase values that is related to the phase values of the data input signals by a Boolean logic function, such as OR, AND, NAND, or NOR. The control input signals determine the logic function performed by the device and can be changed dynamically for dynamic device operation. | ||||||
| 205 | All-optical logic AND operation in a SOA-based mach-zehnder interferometer | US09942686 | 2001-08-31 | US20020118441A1 | 2002-08-29 | Byung Kwon Kang; Jae Hun Kim; Seok Lee; Yoon Ho Park; Deok Ha Woo; Sun Ho Kim; Young Min Jhon; Jong Han Song |
| The present invention relates to the all-optical logic AND operation in a SOA (semiconductor optical amplifier)-based Mach-Zehnder interferometer. More particularly, it relates to the technology making feasible ultra high-speed logic operations while maintaining a small size and a low input power by utilizing a cross-phase modulation (XPM) wavelength converter composed of semiconductor optical amplifiers in the form of a Mach-Zehnder interferometer with nonlinear characteristics. | ||||||
| 206 | Optical logic device and optical memory device | US09517202 | 2000-03-02 | US06437887B1 | 2002-08-20 | Yoshihisa Usami; Masayuki Naya; Yoshio Inagaki |
| An optical logic device comprises a dielectric block arranged such that a driving light is incident on one plane thereof at a total reflection critical angle through an interior thereof, a metallic film formed over the one plane of the dielectric block, and an optical functional film, a refractive index of which is changed by irradiation of light, formed over the metallic film such that the optical functional film is irradiated with a control light. A surface plasmon device is fabricated, which comprises a dielectric block arranged such that a driving light having a uniform intensity is incident on one plane thereof at a total reflection critical angle through an interior thereof, a metallic film formed over the one plane of the dielectric block, an optical functional film, a refractive index of which is changed by irradiation of light, formed over the metallic film such that the optical functional film is irradiated with a signal light subjected to space modulation. The driving light reflected on the one plane upon irradiating the optical functional film with the signal light is made incident on the optical functional film by an optical system. | ||||||
| 207 | Method and device for producing a choice of either single photons or pairs of photons in an optical channel | US09463685 | 2000-09-27 | US06430345B1 | 2002-08-06 | Wolfgang Dultz; Gisela Dultz; Helmar A. Becker; Heidrun Schmitzer |
| A method and device for generating a choice of individual photons or photon pairs in an optical channel. The generation of this choice involves generating a two-photon state corresponding to a photon pair and spatially separating the photon pair while preserving the quantum-mechanical correlation, in the event the photons are emitted in a collinear manner. One photon is coupled into one optical channel each, the one channel containing an interferometer with variable optical path-length difference &dgr;1F−&dgr;1S, and the other channel including an optical delay section having the optical length &dgr;1. The channels are spatially reunited through a beam splitter, and an adjustment of the quantities &dgr;1F, &dgr;1S, and &dgr;1 occurs in such a way that the probability K for coincidences between the outputs of the beam splitter is a choice of approximately K=0 or approximately K=1, or approximately a predetermined intermediate value, with K=0 corresponding to a photon pair in one of the output channels of the beam splitter, and K=1 corresponding to two individual photons in both output channels of the beam splitter. With this choice generation, an optical separating filter or gate can be implemented for a choice of one-photon or two-photon states, which is usable in quantum cryptography and as a basic element of a quantum-optical computing machine. | ||||||
| 208 | Pattern-recognition computing and method for producing same | US09102139 | 1998-06-22 | US06265707B1 | 2001-07-24 | John N. Hait |
| Pattern-recognition computing can be accomplished using wave-type or other types of energy. In pattern-recognition computing which uses a plurality of wave-type energy input patterns modulated with quantized information, energy from the patterns combines to produce interference-based dynamic images. Component parts of a dynamic image are separated and recombined to produce logic and other computing process outputs. To produce a coordinated set of optics for pattern-recognition computing, waveforms at pixel-sized image components of the dynamic image are chosen to become contributors to the combined output if they will contribute (or can be modified to contribute) in a positive manner to a combined output waveform that obeys the logic rules of the device being produced. Iterative changes in input pattern characteristics are used to optimize the coordinated optics. Pattern-recognition computing can also use special interference and frequency-multiplexed logic. | ||||||
| 209 | Optical memory | US904836 | 1997-08-01 | US6035081A | 2000-03-07 | Alistair James Poustie; Keith James Blow; Robert John Manning |
| A regenerative optical memory comprising a number of concatenated non-linear switching elements coupled by an optical storage element has a transfer function arranged so that only optical data having a pulse amplitude above a predetermined threshold is stored and the amplitude of optical data stored is substantially equalised to at least one predetermined level after a number of circulations within the optical memory. In a preferred embodiment, the optical memory is provided with an optical switching element within the optical loop for selectively switching at least a portion of the data pattern out of the optical loop in response to the application of an optical signal to an input of the optical switching element to alter the contents of the memory. | ||||||
| 210 | Optical detection and logic devices with latching function | US869901 | 1997-06-05 | US5999284A | 1999-12-07 | Kim Byron Roberts |
| An optical logic device is provided by an interferometer in which an output optical signal is determined in accordance with an interference condition of the interferometer. The interference condition is reset by an optical setting signal which is counter-propagated through a semi-conductor optical amplifier forming one arm of the interferometer. Latching of the interference condition in the set state is achieved by a feedback signal taken from the output optical signal and combined with the setting signal. Resetting of the interference condition is achieved by nulling the output optical signal by counter-propagating a reset optical signal via second semiconductor optical amplifier constituting the second arm of the interferometer. Alternatively the input optical signal to the interferometer may be interrupted to null the output. A further alternative arrangement utilizes an electrical re-setting signal which actuates an electrical phase shifting device in the second arm of the interferometer. The device has particular application to all optical control of high bit rate communication signals. | ||||||
| 211 | Pattern-recognition computing and method for producing same | US532329 | 1995-09-19 | US5770854A | 1998-06-23 | John N. Hait |
| Pattern-recognition computing can be accomplished using wave-type or other types pf energy. In pattern-recognition computing which uses a plurality of wave-type energy input patterns modulated with quantized information, energy from the patterns combines to produce interference-based dynamic images. Component parts of a dynamic image are separated and recombined to produce logic and other computing process outputs. To produce a coordinated set of optics for pattern-recognition computing, waveforms at pixel-sized image components of the dynamic image are chosen to become contributors to the combined output if they will contribute (or can be modified to contribute) in a positive manner to a combined output waveform that obeys the logic rules of the device being produced. Iterative changes in input pattern characteristics are used to optimize the coordinated optics. Pattern-recognition computing can also use special interference and frequency-multiplexed logic. | ||||||
| 212 | All-optical devices | US658536 | 1996-06-05 | US5757525A | 1998-05-26 | Devulapalli V. G. L. N. Rao; Francisco J. Aranda; Desai Narayana Rao; Joseph A. Akkara; Joseph F. Roach; Zhongping Chen |
| All-optical devices, e.g., optical switches and modulators, and logic gates such as optical AND and OR gates, that include photochromic materials having first and second stable states, such as bacteriorhodopsin, organic fulgides, azo and fluorescent dyes, phycobiliproteins, rhodopsins, and their analogs, irradiated in a four-wave mixing geometry, are described. These devices can be used in a wide variety of systems, such as, e.g., optical signal processors and optical computers. | ||||||
| 213 | Method and device for combining optical signals | US653777 | 1996-05-28 | US5687021A | 1997-11-11 | Michel Sotom; Corinne Chauzat; Dominique De Bouard; Jean-Michel Gabriagues; Dominique Chiaroni |
| Logic operations are carried out on binary optical signals using a non-linear optical amplifier having a front port and a rear port respectively receiving a front wave and a modulated rear wave. The output wave via the rear port is separated from the rear wave by exploiting the fact that they have opposite propagation directions. Applications include optical data switching and transmission. | ||||||
| 214 | Non-linear semiconductor optical device | US397203 | 1995-03-28 | US5673140A | 1997-09-30 | Michael Andreja Fisher |
| A non-linear semiconductor optical device includes an active waveguide with a multiple quantum well construction in the active region. The device is supplied with a drive current at the material transparency current with respect to an optical pump. An optical non-linearity appears with respect to input radiation having a wavelength below that of the bandgap equivalent wavelength of the active region (.lambda.<.lambda.g), the effect being achieved at relatively low optical input powers. The non-linearity is fast enough that a switching device incoporating the invention, in use as a demultiplexer, has potential to be used at bit rates approaching the Tbit/s range. In a demultiplexer embodiment, the non-linearity may be exploited in a directional coupler, an optical pump being used intermittently to control cross-over of an incoming TDM data signal so as to "pick off" a selected channel. Other applications include optical logic devices. | ||||||
| 215 | Method and apparatus for optical logic and switching functions | US577136 | 1995-12-22 | US5600479A | 1997-02-04 | Alan F. Evans |
| Intrapulse Raman scattering is utilized in providing optical devices that can be adapted to perform various logic and switching functions. In a logic gate embodiment of the present invention, a plurality of pulses of the same central wavelength are coupled to produce an output pulse having a power level equal to the sum power level of the inputs. When the power level of a sufficiently narrow output pulse exceeds the Raman threshold, the output pulse experiences a wavelength shift of a magnitude that can be controlled by adjusting the input power. An optical filter selectively blocks coupler output pulses depending on the desired logical operation of the device. In a switch according to the invention, an input pulse and a control pulse are coupled, and Raman scattering of the output pulse is stimulated. The output pulse is applied to several output lines, each having a filter centered at a predetermined pass band. The input pulse is thereby passed to a selected output line or lines depending on the magnitude of the control pulse. | ||||||
| 216 | Interferometric modulator for optical signal processing | US237186 | 1994-05-03 | US5583636A | 1996-12-10 | Jeffrey A. Bulow |
| An interferometric modulator uses a beamsplitter to produce deflected and transmitted light beams onto mirrored surfaces of a piezoelectric crystal pair, one piezoelectric crystal being driven by a modulating voltage signal, whereupon the light beams are reflected back to the beamsplitter to produce a modulated optical output signal, with the modulator being especially adaptable for use as a digital photonic clock, as a pulse width/amplitude modulator, and as a bistable optical memory cell. A self-switching optical digital clock generates a digital signal without piezoelectric crystals by using analog optical feedback signals of precise time durations. Interferometric modulation is also used to amplify a sinusoidal electromagnetic signal, to regulate signal amplification, and to create logic functions. | ||||||
| 217 | Symmetric Mach-Zehnder all-optical device | US269575 | 1994-07-01 | US5535001A | 1996-07-09 | Kazuhito Tajima |
| The Mach-Zehnder type all-optical device for controlling a signal light with a control light, includes two arms for constituting a Mach-Zehnder configuration, each of the arms being constituted at least partially of material having third order optical nonlinearity, and an introducer of a control light to a portion of each of the arms revealing the optical nonlinearity. | ||||||
| 218 | Optical processor | US194666 | 1994-02-14 | US5446579A | 1995-08-29 | Svjatoslav A. Lomashevitch |
| An optical processor includes a non-linear ring resonator with lasers and two waveguides with electrodes positioned above them. This optical processor extends its functional range, i.e. providing multi-level processing of optical signals, an increase of power responsivity of input signals, increasing the number of optical contacts. In this optical processor, semiconductor lasers have been provided on the coupling waveguides. Optical mode mixers in coupling regions have been generated by connecting the waveguides and the ring resonator in coupling regions so that the following relationship is observed: an one-mode waveguide and a ring resonator make up a two-mode mixer, and electrodes are applied above the coupling regions. | ||||||
| 219 | All-optical inverter | US168291 | 1993-12-17 | US5434701A | 1995-07-18 | Mohammad T. Fatehi; Clinton R. Giles |
| An all-optical inverter device is achieved by employing an optical amplifier having a optical filter positioned in a feedback loop arranged so that an output signal of the optical amplifier having a first characteristic wavelength is inversely related to an input signal to the optical amplifier having a second characteristic wavelength. | ||||||
| 220 | Global interconnect architecture for electronic computing modules | US215292 | 1994-03-21 | US5432722A | 1995-07-11 | Peter S. Guilfoyle; Frederick F. Zeise; Valentin N. Morozou |
| An architecture for an optical computing apparatus which utilizes global free space smart optical interconnects and is based on a digital logic family derived from augmenting semiconductor technology with optical logic. The apparatus comprises input means, control means, and detector means, where the detector means includes means for detecting an optical input signal, electronically amplifying and selectively negating the detected signal, and providing an optical output signal. The architecture is capable of providing outputs which are Boolean logical AND/OR operations on designated combinations of binary input bits, and in another embodiment is capable of forming the combinatorial functionals and summations into which an arbitrary user instruction may be decomposed by means of Shannon's theorem and DeMorgan's laws. | ||||||
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