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 |
|---|---|---|---|---|---|---|
| 101 | OPTICAL DIFFERENTIAL PHASE-SHIFT KEYED SIGNAL DEMODULATOR | US13534276 | 2012-06-27 | US20120269523A1 | 2012-10-25 | Kevin McCallion; Xueyan Zheng |
| A phase-shift keyed signal demodulator and method for demodulating is disclosed. An example demodulator includes N filters that receive inputs from a splitter and include transmission functions offset from one another. N pairs of photodiodes receive the transmitted and reflected beams from each filter and a decoder converts the outputs of the pairs of photodiodes to one or more data symbols. | ||||||
| 102 | OPTICAL COMMUNICATION SYSTEM | US13502887 | 2010-10-15 | US20120230687A1 | 2012-09-13 | Atsushi Okamoto; Kazuyuki Morita |
| The present invention causes spatial-mode light emitted from an optical fiber (11), which is a multimode fiber, to pass through a photorefractive medium (13). The photorefractive medium (13) includes holograms for signal separation that are written by irradiation of the photorefractive medium with (i) guide light having a wave front identical to the wave front of signal light having a particular spatial mode and (ii) control light. The photorefractive medium includes holograms recorded in a multiplex manner with use of control light having different incidence angles in correspondence with respective spatial modes. For signal separation, irradiating the photorefractive medium (13) with control light (15) having a particular angle separates signal light having a spatial mode corresponding to the incidence angle of the control light (15). | ||||||
| 103 | OPTICAL DIFFERENTIAL PHASE-SHIFT KEYED SIGNAL DEMODULATOR | US12687570 | 2010-01-14 | US20110170171A1 | 2011-07-14 | Kevin McCallion; Xueyan Zheng |
| A phase-shift keyed signal demodulator is disclosed including a filter positioned to receive an input beam, a first photodiode positioned to receive light reflected from the filter, and a second photodiode positioned to receive light transmitted through the filter. A difference between outputs of the first and second photodiodes is interpreted to determine a data value encoded in the input beam. In another embodiment N filters receive inputs from a splitter and include transmission functions offset from one another. N pairs of photo diodes receive the transmitted and reflected beams from each filter and a decoder converts the outputs of the pairs of photodiodes to one or more data symbols. | ||||||
| 104 | Delay-line demodulator | US12629846 | 2009-12-02 | US07884996B2 | 2011-02-08 | Junichi Hasegawa; Kazutaka Nara |
| A delay-line demodulator for demodulating a differential quadrature phase shift keying (DQPSK) signal is provided. The demodulator includes two Mach-Zehnder interferometers individually comprising two waveguides having different lengths therebetween and through which a light signal branched from the DQPSK signal propagates, respectively. A phase of the light signal propagating at one of the waveguides is delayed as compared to a phase of the light signal propagating at another one of the waveguides, wherein a divergence amount of polarization is adjusted by driving sets of heaters that are facing each other and sandwiching a half wavelength plate therebetween. | ||||||
| 105 | Delay-line demodulator | US12248871 | 2008-10-09 | US07649678B2 | 2010-01-19 | Junichi Hasegawa; Kazutaka Nara |
| A delay-line demodulator for demodulating a differential quadrature phase shift keying (DQPSK) signal is provided. The demodulator includes two Mach-Zehnder interferometers individually comprising two waveguides having different lengths therebetween and through which a light signal branched from the DQPSK signal propagates, respectively. A phase of the light signal propagating at one of the waveguides is delayed as compared to a phase of the light signal propagating at another one of the waveguides, wherein a divergence amount of polarization is adjusted by driving sets of heaters that are facing each other and sandwiching a half wavelength plate therebetween. | ||||||
| 106 | Coupler of Duality Modulated Radiation and Related Method | US11845079 | 2007-08-26 | US20070292144A1 | 2007-12-20 | Stuart Mirell; Daniel Mirell |
| A generator of duality modulated radiation, of which the irradiance, the wave intensity, or both, are varied from ordinarily equivalent levels, either for purposes of providing energy depleted or energy enriched radiation or for purpose of encoding an information signal. Various techniques are disclosed for restoring irradiance levels to “ordinary” levels, or for amplifying irradiance without affecting wave intensity. A communication system employing duality modulated radiation is also disclosed. | ||||||
| 107 | Quantum switches and circuits | US10059177 | 2002-01-31 | US06819474B2 | 2004-11-16 | Ralph G. Beil; Kenneth Laine Ketner |
| Quantum switches, referred to as trisistors, operate on the basis of interactions between two elementary particles (EP), such as photons, electrons, phonons, etc. A first EP is used as a control input to the trisistor and interacts with a second EP, thereby inducing a detectable state change in the second EP that determines the trisistor's output value. The physical property which determines the particular EP state could be, for example, polarization, spin direction or energy level. The trisistors are connected primarily in series rather than in parallel as in previous quantum computing devices. The trisistors can be combined to form various types of logic gates, circuits, and other computer components. To implement the changes of state of the trisistors, one preferred embodiment employs nonlinear optics using a thin section of crystal. | ||||||
| 108 | Enhanced feed forward optical frequency/phase demodulator | US09619924 | 2000-07-20 | US06452714B1 | 2002-09-17 | David L. Rollins |
| A demodulation system used in connection with an analog optical link. An optical carrier signal modulated with an RF signal is split into two portions. One carrier signal portion is applied to a coarse demodulator that generates a demodulated signal representative of the RF signal and the additive inverse of an error signal. The coarse demodulator output is inverted and applied to a phase modulator along with the second carder signal portion. The phase modulator modulates the optical carrier signal with the additive inverse of the demodulated signal from the coarse demodulator, and the RF signal components of the carrier signal and the demodulated signal cancel, leaving the carrier signal modulated with the error signal. The modulated carrier signal is filtered, then demodulated to regenerate the error signal, which is combined with the demodulated signal from the coarse demodulator to recreate the RF signal with minimal excess noise and distortion. | ||||||
| 109 | Optical pulse generation using a high order function waveguide interferometer | US09428969 | 1999-11-04 | US06341031B1 | 2002-01-22 | Gregory J. McBrien; Karl M. Kissa; Peter Hallemeier; Thomas Joseph Gryk |
| An optical pulse generator having a high order transfer function that comprises a first and a second nested interferometric modulator, each modulator comprising an optical input, an electrical input, a first arm, a second arm and an optical output. The second interferometric modulator is optically coupled into the second arm of the first interferometric modulator. The optical output of the first interferometric modulator generates pulses at a repetition rate that is proportional to a multiple of a frequency of an electrical signal applied to the electrical input of at least one of the first and second interferometric modulator and at a duty cycle that is inversely proportional to the order of the transfer function of the optical pulse generator. The multiple may be any integer equal to or greater than one. | ||||||
| 110 | Quantum synthesizer, THz electromagnetic wave generation device, optical modulation device, and electron wave modulation device | US832205 | 1997-04-08 | US5937118A | 1999-08-10 | Kazuhiro Komori |
| A device capable of obtaining an electromagnetic wave having an arbitrary waveform and an arbitrary frequency, generating an electromagnetic wave with an ultrahigh frequency, generating an electromagnetic wave with a variable frequency, and performing ultrafast optical control and optical modulation is provided. The quantum synthesizer of the present invention has a quantum synthesis portion comprising a number, n (n=an integer of 3 or more), of quantum wells provided in proximity to each other so as to be coupled together quantum-mechanically, each of the n number of quantum wells having the n number or number larger than n of coupled levels as a result of coupling, and is adapted to excite and synthesize the electron waves or polarizations of the respective levels, while controlling their phases and amplitudes, by means of coded light with phases and amplitudes controlled for predetermined frequencies (energies). | ||||||
| 111 | Polarization insensitive optical signal reception | US530421 | 1990-05-31 | US5031236A | 1991-07-09 | Terence G. Hodgkinson; David W. Smith |
| The invention provides methods and devices for processing an optical signal. In one embodiment, an optical device (101) for scrambling an input optical signal comprises an optical switch (10) which switches the optical signal between two intermediate optical paths (13,14) under control of a scrambling signal from a control circuit (12). The polarization of the signal in one of the intermediate optical paths (13) is rotated by a TE-TM converter (15). The polarization of the two intermediate signals are thereby made mutually orthogonal. These mutually orthogonal signals are then recombined by a directional coupler (16) to provide a combined output optical signal with a scrambled polarization alternating between orthogonal states according to the frequency of the scrambling signal.The invention may be applied to improve signal reception, for example, in coherent optical transmission systems. | ||||||
| 112 | LIGHT MODULATOR DEMODULATOR AND METHOD OF COMMUNICATION EMPLOYING THE SAME | US71084685 | 1985-03-12 | USRE32521F1 | 1990-09-18 | FERGASON JAMES L |
| 113 | Atomic resonance in crossed linear polarization | US341209 | 1989-04-21 | US4899345A | 1990-02-06 | Normand Cyr; Michel Tetu; Vincent Giordano |
| A method and apparatus for deriving information on a light beam. The light beam is processed by an optical system to produce two quasi-collinear beams propagating in opposite directions, namely pump and probe beams with orthogonal linear polarizations. The beams interact with the medium contained in a cell, which medium is capable to manifest absorption resonance. As a result of the beams interaction with the medium, the intensity of the probe beam transmitted through the medium, considered along a predetermined polarization axis, becomes representative of a particular state of absorption resonance of the medium, which resonance occurs when the frequencies of the pump and probe beams are located within a narrow absorption resonance frequency bandwidth characterizing the medium. The invention finds applications in the laser spectroscopy technology as well as in the construction of frequency stabilized laser sources, optical filters and optical communication systems, among others. | ||||||
| 114 | C. W. laser wavemeter/frequency locking technique | US883238 | 1986-07-08 | US4746878A | 1988-05-24 | Gregory M. Cutler |
| A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f.sub.0 to a radio frequency f.sub.1 or for locking the radio frequency to the optical frequency. A beam of optical frequency f.sub.0 is phase modulated by a signal of average frequency f.sub.1 that is itself modulated at frequency f.sub.2. The modulated beam is passed through a filter to a detector to produce a detector output signal that has components at linear integral sums of f.sub.1 and f.sub.2. A pair of control signals are generated that are proportional to the amplitude of two of the components of the detector output signal. These control signals are separately used in a pair of servo loops to separately establish fixed values of f.sub.0 /f.sub.f and f.sub.1 /f.sub.f, where f.sub.f is a characteristic frequency of the filter. A method is presented for stepping the value of f.sub.0 /f.sub.f to another value and measuring f.sub.1 /f.sub.2 at each of these values, thereby enabling the value of f.sub.0 to be determined. | ||||||
| 115 | CW Laser wavemeter/frequency locking technique | US727457 | 1985-04-26 | US4631498A | 1986-12-23 | Gregory M. Cutler |
| A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f.sub.0 to a radio frequency f.sub.1 or for locking the radio frequency to the optical frequency. A beam of optical frequency f.sub.0 is phase modulated by a signal of average frequency f.sub.1 that is itself modulated at frequency f.sub.2. The modulated beam is passed through a filter to a detector to produce a detector output signal that has components at linear integral sums of f.sub.1 and f.sub.2. A pair of control signals are generated that are proportional to the amplitude of two of the components of the detector output signal. These control signals are separately used in a pair of servo loops to separately establish fixed values of f.sub.0 /f.sub.f and f.sub.1 /f.sub.f, where f.sub.f is a characteristic frequency of the filter. A method is presented for stepping the value of f.sub.0 /f.sub.f to another value and measuring f.sub.1 /f.sub.2 at each of these values, thereby enabling the value of f.sub.0 to be determined. | ||||||
| 116 | Fiber optic energy sensor and optical demodulation system and methods of making same | US563077 | 1984-01-23 | US4568408A | 1986-02-04 | Donald Schmadel; William H. Culver; Gordon Gould |
| A fiber optic energy sensor and optical demodulation system is disclosed wherein the signal energy to be sensed or detected causes an etched single mode fiber to be stretched or compressed which causes the optical path length for electro-magnetic radiation traveling in the core of the optic fiber to change. The change in optic path length modulates the electro-magnetic radiation traveling in the fiber. There is also disclosed novel methods of manufacturing the novel type of fiber optic energy sensor and optical demodulation system. | ||||||
| 117 | Process and apparatus for the coherent detection and demodulation of a phase-modulated carrier wave in a random polarization state | US443143 | 1982-11-19 | US4506388A | 1985-03-19 | Michel Monerie; Alain Leclert |
| Process for the coherent detection and demodulation of a carrier wave in a variable polarization state and apparatus for performing this process.According to the invention, the incident wave is subdivided into two components having orthogonal polarization states and these two components form the object of a coherent detection. For this purpose, a local oscillator supplies a local wave, which is itself divided into two components having orthogonal polarization states, which supply two detection - demodulation channels. The demodulation signals of these two channels are combined, and in particular added, and the resulting signal makes it possible to recover the information independently of the polarization state of the incident wave.Application to optical transmission. | ||||||
| 118 | Fiber optic energy sensor and demodulation system and method of making same | US402578 | 1982-07-28 | US4468091A | 1984-08-28 | Donald Schmadel; William H. Culver; Gordon Gould |
| A fiber optic energy sensor and optical demodulation system is disclosed wherein the signal energy to be sensed or detected causes an etched single mode fiber to be stretched or compressed which causes the optical path length for electro-magnetic radiation traveling in the core of the optic fiber to change. The change in optic path length modulates the electro-magnetic radiation traveling in the fiber. There is also disclosed novel methods of manufacturing the novel type of fiber optic energy sensor and optical demodulation system. | ||||||
| 119 | Solid state optical junction devices and arrays and systems incorporating same | US38978373 | 1973-08-20 | US3898453A | 1975-08-05 | JAVAN ALI |
| Optical radiation generation and detection using metal-to-metal diode junctions. Coherent optical radiation is generated by using an antenna connected to a metal-to-metal diode junction with nonlinear current-voltage characteristics and by coupling to the junction electromagnetic radiation energy to interact with the junction, causing emission from the antenna at optical frequency absent from the input. Optical diodes are shown in the forms of a mechanically contacted cat whisker system and as single and multiple microscopic solid portions in an integrated solid mass, defining both the antenna and the junction, preferably as a deposit of solid layers upon a substrate, preferably as overlapping printed circuit line structures. Arrays of such junctions provide enhanced effects; useful arrays include Franklin-Marconi geometries, fish-bone antennas and row and column arrays. Such solid diode constructions and arrays thereof are used not only for optical radiation generation but also detection and mixing including use in an image scanner, energy converter and a broad band detector. The diodes as a radiation source are used in combination with an absorbtion cell in spectroscopic analysis, a feedback loop in a stable frequency source, and an optical frequency communicating system. In a scanner, read-out from the junctions is shown indirectly, using an electron beam, and directly using leads connected to respective antennae. Local oscillators directing radiation upon an image disecting array, mixing in the junctions with incident radiation from the image create superheterodyne beats leading to improved levels of detection. By phase locking the local oscillator to the frequency of coherent image-illuminating radiation, and detecting phase of the beats relative to the illuminating radiation, as well as amplitude, a holographic display of the image is achieved.
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| 120 | Optical receiver having a maximized signal-to-noise ratio | US3729633D | 1970-11-24 | US3729633A | 1973-04-24 | EROS S; THRASHER P |
| A method of maximizing the signal-to-noise (S/N) ratio or a direct-detecting optical pulse receiver for an input pulse having a well-defined duration and receiver apparatus derived therefrom. The S/N ratio is defined as the ratio of the signal output peak instantaneous power to the noise output mean power. The optical receiver comprises an optical detector with fast-response, highsensitivity characteristics followed by a cascade arrangement of amplifiers, two RC dividing networks, one low pass and the other high pass and an amplitude detector. The noise sources comprise the quantum noise generated within the input light-sensitive device and the thermal noise generated within the input load resistor of the device. The dividing networks form a bandpass filter which is designed to maximize the S/N ratio. As a result, the time constants of the filters turn out to be substantially equal and the output load resistance of the detector is set as high as is practical. The method achieves a S/N ratio approaching that obtainable with an ideal matched filter for small values of the input pulse width (to), e.g., of the order of 10 nanoseconds. The S/N ratio improvement over prior art receivers is in the order of 20 db. The receiver is especially effective when to is less than 1 microsecond.
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