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5479539 |
Integrated optical transmitter and receiver
An optical-electrical transmitter/receiver (300) with an optical detector (310) for reception which may be made transparent for optical transmission. This permits transmission (320, 330) and...
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5471545 |
Optical external modulator for optical telecommunications
There is provided an optical external modulator that can modulate the polarization of incident light without regulating the state of polarization of the light entering the modulator. Such a...
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5459799 |
Tunable optical filter
A tunable optical filter for use in wavelength division multiplexing systems. The optical filter contains a plurality of tunable reflection gratings which block all of the channels in the incoming...
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5455876 |
High-speed external integrated optical modulator
An improved high-speed external optical modulator, modulated by RF waves, which velocity matches the RF waves with the optical waves is disclosed. The apparatus includes a lithium niobate substrate...
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5448664 |
Optical gates where output signal intensity is independent of phases of input signals
A method for amplifying optical signals without dependence of output signal intensity on an input-signal phase is provided. This method is based on nonlinear interaction of three phase-synchronized...
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5448665 |
Wavelength-selective optical device utilizing a selectively variable surface acoustic wave grating in a polar organic material
A wavelength-selective arrangement interacts with optical radiation propagating in a transmission medium. The arrangement includes a selector member made of a polar organic material which exhibits...
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5420868 |
Suppression of brillouin scattering in lightwave transmission system
Optical nonlinear effects, such as stimulated (Brillouin) scattering, cause disproportionate attenuation of transmitted optical signals and usually occurs only when the optical power exceeds a...
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5416858 |
Integrated electrooptical modulation device
An electrooptical modulation device formed on an electrooptical substrate, including a first region having a Y-junction for receiving an optical signal to be modulated and dividing the optical...
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5381251 |
Optical switch element and a liquid crystal light directional coupler used in the optical switch element
An optical switch element for selectively transmitting or shielding light from a first optical wave guide to a second optical wave guide is disclosed. The optical switch element includes a first...
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5367582 |
Vertically-coupled arrow modulators or switches on silicon
An optical modulator is disclosed. The modulator is based upon an ARROW waveguide, consisting of a substrate, a lower cladding, an interference layer, and a core layer. An electronic element is...
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5359678 |
Apparatus and method employing fast polarization modulation to reduce effects of polarization hole burning and/or polarization dependent loss
The effects of polarization dependent hole burning and/or polarization dependent loss are reduced by modulating the state of polarization (SOP) of an optical signal being launched into the...
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5355422 |
Broadband optical modulator
A broadband optical modulator having a light waveguide and modulating electrodes incorporated into an output or drain transmission line of a distributed amplifier driver. The modulator has a...
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5349465 |
Optical democulator
An optical demodulator includes a nonlinear element which responds to both light and a microwave-submillimeter wave (far infrared radiation). An optical signal modulated by a modulating wave in...
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5339369 |
High-speed external modulator
An improved high-speed external optical modulator, modulated by RF waves, which velocity matches the RF waves with the optical waves is disclosed. The apparatus includes a lithium niobate substrate...
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5323409 |
Wavelength stabilization
An optical source emits a source optical signal having a source optical signal power and a wavelength. A splitter or other similar device splits the source optical signal into a first optical...
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5321777 |
Fibre modulators
A modulation assembly includes a fibre having a drawn tapered portion, and apparatus for applying a perturbation to the tapered portion to vary the percentage transmission through the fibre.
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5313056 |
Electronically controlled frequency agile impulse device
An electronically controlled frequency agile impulse source utilizing pulse sharpening techniques to increase its versatility in radiating impulse energy at a variety of center frequencies and...
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5309530 |
Technique utilizing stress-induced birefringence for reducing polarization dependent hole-burning in an amplified optical transmission system
A technique for reducing signal degradation and fading within a long optical transmission system by minimizing polarization dependent hole-burning ("PDHB") through the cyclic stressing of a...
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5295205 |
Environmentally stable monolithic Mach-Zehnder device
A monolithic, environmentally stable Mach-Zehnder device is formed by threading first and second dissimilar optical fibers through the bore of a glass tube. The tube is evacuated and heated to...
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5278923 |
Cascaded optical modulation system with high linearity
An optical modulation system having cascade-coupled electro-optic modulator stages in either dual tandem or split tandem configurations. An electrical splitter derives multiple electrical drives...
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5274495 |
Optical amplifier
An optical amplifier is disclosed which, in an optical amplifier adapted such that signal light and pump light are propagated through an optical waveguide structure (2, 2') therein made of an...
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5268911 |
X-cut crystal quartz acousto-optic modulator
An acousto-optical laser modulator includes an X-cut crystal quartz block. A transducer, such as a piezoelectric device, is coupled to the block. An electrical signal provided to the transducer...
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5265178 |
Fiber optic data communication system
A system and method for data communications using a multiplicity of modulators, each of which accept a data input signal and modulate an optical carrier generated by a single optical energy source...
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5253099 |
Reflective optical modulator
In a reflective optical modulator light enters through an optical waveguide into a detunable optical resonator which couples it back into the optical waveguide, the modulation being effected by...
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5253309 |
Optical distribution of analog and digital signals using optical modulators with complementary outputs
A novel optical system is taught including an optical source, an optical modulator having at least one optical input port for receiving the optical signal from the optical source, a modulation port...
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5253314 |
Tunable optical waveguide coupler
Various optical functions are generated in accordance with the present invention of a novel broadly tunable monolithic wavelength selective coupler which can be integrated with a gain medium to...
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5227913 |
Co-deposition of erbium and titanium into lithium niobate and optical amplifier produced thereby
Er and Ti are co-diffused under controlled conditions into a single crystal of LiNbO 3 . The co-diffusion is used to produce a light amplifier in LiNbO 3 that is suitable for use in integrated...
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5208817 |
Modulator-based lightwave transmitter
An externally modulated laser-based transmitter is disclosed which utilizes an automatic bias control (ABC) circuit to maintain the bias voltage applied to the external modulator at a predetermined...
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5191387 |
Polarization control system
A polarization is controlled by introducing a phase difference in an incident light at first, then introducing a phase difference by 45 degrees, and then the polarized light is rotated. The light...
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5166821 |
Reduction of non-linear effects in optical fiber communication systems and method of using same
Non-linear effects in an optical fiber used for communicating AM signals at high power levels are reduced by increasing the linewidth of the pump laser output signal. The linewidth can be increased...
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5166988 |
Thermal phase modulator and method of modulation of light beams by optical means
Apparatus is provided for modulating the phase of a coherent light beam pagating through the core of a single-mode waveguide. A light-absorbing element is connected to a portion of the cladding of...
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5159586 |
Device for processing optical data
A device for processing optical data comprising a transparent substrate for a light to be applied, light source for projecting the diverging light onto one surface of the substrate substantially...
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5155619 |
Optical AND/OR gate employing non-linear organic polymers and photovoltaic/piezoelectric optical interfaces
A multi-channel/multi-layer optical gate contained within a fiber-optic housing having any number of optical cells disposed within the housing. The optical cells are made up of non-linear organic...
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5153930 |
Device employing a substrate of a material that exhibits the pyroelectric effect
An article is manufactured from a substrate of a material that exhibits the pyroelectric effect by depositing a film containing a selected material in a first state over a front surface of the...
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5150435 |
Signal processing system of optical fiber gyro
A signal processing system of an optical fiber gyro comprises a light emitting element for generating a monochromatic light, a fiber coil, a branching element for dividing the monochromatic light...
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5134671 |
Monolithic integrated optical amplifier and photodetector
An optical amplifier and photodetector are monolithically integrated, with the photodetector being optically coupled to the optical amplifier through a low radiative loss and low back reflectivity...
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5128800 |
Gain switchable optical fiber amplifier
An optical fiber amplifier has a lossy nonlinear medium connected between its input port and its output port. The resultant optical feedback loop permits remote gain switching of the optical...
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5121449 |
Information detecting system of scanning type
Disclosed is an information detecting system of scanning type which comprises a substrate formed with an optical waveguide layer, a laser oscillator emitting a laser beam, a SAW type beam...
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5117470 |
Guided-wave optical circuit and method for adjusting a characteristic thereof
A method for adjusting a characteristic of a guided-wave optical circuit which includes one or more waveguides formed by a substrate, a cladding layer formed on the substrate, and a core portion...
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5111322 |
Polarization multiplexing device with solitons and method using same
The single-wavelength bit-rate capacity of an ultra long distance soliton transmission system is increased by using a combination of polarization and time-division multiplexing. More specifically,...
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5111326 |
Integrated Kerr shutter and fiber laser optical modulation
An optical modulation source provides a pulsed optical signal 44 by coupling a pulsed optical pump signal 13 polarized along one axis of a polarization preserving fiber 24 having a wavelength λp...
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5109441 |
Fiber optic external modulator
An improved external optical modulator provides reduced noise and distortion. An optical carrier to be modulated is split into a plurality of portions. A first portion of the carrier is modulated...
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5101469 |
Light isolator of waveguide type
A waveguide type light isolator capable of easily matching the phases of the TE wave and TM wave comprises a substrate and a light waveguide layer formed on the substrate. The waveguide layer has a...
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5091981 |
Traveling wave optical modulator
A travelling wave optical modulator comprises a Z-cut lithium niobate substrate on which is formed a proton exchanged optical waveguide and a travelling wave electrode. The optical waveguide is...
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5091979 |
Sub-micron imaging
Imaging at sub-micron dimensions--at dimensions ordinarily thought to approximate those within diffraction limitations of the chosen imaging radiation--is expedited by use of a new category of...
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5091980 |
Optical quantum interference device/optical computer and method of modulating light using same
A device structure is provided for optical modulation using a quantum interference effect in an excited state of electron-systems. The optical modulation is performed by causing the effect of...
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5083856 |
Waveguide-type acoustooptic device
A light beam is introduced into an optical waveguide on a substrate of LiNbO 3 , and diffracted by a surface elastic wave generated by a tilted-finger chirped interdigital transducer on the optical...
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5080503 |
Optical waveguide device and method for making such device
The present disclosure describes an optical waveguide device and a method for making such device. The device comprises a substrate; a waveguide embedded in the substrate, the waveguide having a...
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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"...
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5076658 |
Non-linear optical polymeric fiber waveguides
An optical waveguide is comprised of an optical fiber having a core and a cladding wherein the core comprises an organic polymer media exhibiting non-linear optical response over a predetermined...
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