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6324333 |
Common light source for testing optical circuits
A method and apparatus for testing a plurality of optical circuits provides a single broadband light source and means for splitting the light produced by the broadband light source in order to...
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6310700 |
Velocity matching electrode structure for electro-optic modulators
This is an electro-optic modulator having an electro-optic substrate such as lithium niobate, an optical waveguide defined within the substrate, an electrode structure including a microwave...
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6304685 |
Low drive voltage LiNbO3 intensity modulator with reduced electrode loss
This device is a broadband, electro-optic modulator comprising an exemplary coplanar waveguide (CPW) electrode structure on an exemplary Mach-Zehnder interferometer. The modulator is formed on a...
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6301399 |
Integrated optic modulators with high gain bandwidth product
The present invention relates to integrated optic modulator devices and methods for their fabrication. Lithium niobate substrates have waveguides fabricated in them for propagating light energy,...
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6295158 |
Thermooptical modulator
The thermooptic modulator includes a wave guide (1) having a switching section (4), a refracting section (5) bordering the switching section (4) and extending transversely to a signal propagation...
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6292597 |
N×N non-blocking optical switch
Combinations of optically coupled Generalized Mach-Zehnder Interferometers (GMZIs) result in switches of greater switching capacity than an isolated GMZI. In a preferred form, the present invention...
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6289142 |
Optical pulse generator
An optical pulse generator of simple constitution being able to generate a pulse train formed of short optical pulses is provided. The optical pulse generator includes an optical modulator 10 which...
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6278820 |
High power and large bandwidth traveling-wave photodetector
A traveling-wave photodetector (10, 22, 30) having a waveguide layer (12) separated, such as by an intermediate layer (24), from an absorbing layer (14). Absorbed power is spread out, minimizing...
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6275623 |
Dynamically configurable spectral filter
Wavelength dispersion and spatial light modulation are combined having regard for polarization management within a feedback control system for dynamically adjusting spectral power distributions...
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6269199 |
Through silicon modulator and method using polarized light
Through silicon optical modulators (TSOM) formed in a silicon integrated circuit comprise an array of MOSFET elements which cause optical phase shifts of reflected light to identify a state of a...
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6262834 |
Wideband single sideband modulation of optical carriers
The wideband single-sideband modulator generates single-sideband (SSB) modulation with suppressed carrier utilizing traveling-wave LiNbO 3 modulators in a Sagnac loop. In the wideband...
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6256426 |
Semiconductor phase modulator
A semiconductor phase modulator comprises a lower cladding layer, an active waveguide and an upper cladding layer, deposited successively on a substrate made of III-V material. The active waveguide...
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6233070 |
Optical system and method for changing the lengths of optical paths and the phases of light beams
An optical system comprises two optical paths P 1 , P 2 , and an optical path changer for changing the optical length of the two optical paths. The optical path changer includes two phase...
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6212316 |
Stand-off matched index optical waveguide interface
The Stand-Off Matched Index optical interface reduces optical reflections thereby increasing return losses that occur when an optical waveguide, including optical fiber, is interfaced to a bulk...
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6204951 |
Electro-optic modulator with improved harmonic performance
An electro-optic modulator includes a splitting section, at least three transmission legs, an RF phase-shifting section, a DC-phase shifting section, and a combining section. The splitting section...
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6198853 |
Semiconductor optical functional element
A semiconductor optical functional element driven with broad range of withstand voltage even if put in forward bias is provided a double heterojunction structure comprising a first...
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6198860 |
Optical waveguide crossings
An optical waveguide structure including a first waveguide, a second waveguide that intersects with the first waveguide, and a photonic crystal resonator system at the intersection of the first and...
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6193157 |
Frequency division multiplexed bar code scanner
A frequency division multiplexed bar code scanner system includes a plurality of radiation sources for simultaneously providing a plurality of source beams, and a modulator circuit for modulating...
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6178275 |
Method and apparatus for modulation of guided plasmons
The present invention relates to a method and apparatus for the generation, manipulation and detection of plasmon, and/or solitons, both linear and non linear, in semi-conductor heterostructures....
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6175672 |
RF wide bandwidth lossless high performance low noise transmissive link
A substantially lossless transmissive link, such as an RF fiber optic link, that selectively employs a number of techniques to improve various link parameters. The link may be structured to...
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6175668 |
Wideband polarization splitter, combiner, isolator and controller
A wideband polarization splitter and combiner is fabricated using either fiber coupler technology or planar coupler technology. The device splits or combines wideband light signals without losing a...
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6167168 |
Arrangement of optical waveguides
A phased array with several optical waveguides with optical lengths that increase from waveguide to waveguide has a first arrangement for modifying the optical length of waveguides with the...
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6163633 |
Optical waveguide switch having peltier junction control elements
A optical switch comprising: a substrate; and a Mach-Zehnder interferometer circuit provided on the substrate, the Mach-Zehnder interferometer circuit comprising two directional couplers and two...
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6148122 |
High speed lithium niobate polarization independent modulators
An optical modulator receives both an optical channel signal and at least one electrical driving voltage signal, and generates an optical output channel signal which is polarization independent....
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6128421 |
Electro-optical phased array beam modulator
An electro-optical phased array beam modulator is an apparatus for modulating a polarized coherent light source to produce a directionally controlled output beam which can be continuously steered...
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6122413 |
Fiber optic transmitter
A fiber optic transmitter provides integrated creation and amplification of a fiber optic signal from a single pump source. A fiber laser is utilized to produce a signal output and a remnant pump...
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6101295 |
High-frequency circuit, optical module employing same, and method of matching impedance
A high-frequency circuit exhibiting favourable characteristics even in frequency domains in excess of 40 GHz is obtained by configuring a matching circuit 40 with open stubs 16 joined to a...
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6081631 |
Modulation method and semiconductor optical modulator
In an optical modulation method a wave to be modulated and an optical control wave are injected simultaneously and colinearly into the same waveguide formed in a semiconductor diode that is...
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6072919 |
Apparatus and method for improving the frequency response of modulators based on the Sagnac interferometer
An optical method and apparatus particularly useful as an intensity modulation system, in which two phase modulators are placed in the loop of a Sagnac interferometer. Selective placement of the...
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6064417 |
Laser printer using multiple sets of lasers with multiple wavelengths
A color printer for imaging on an image plane includes: (a) a plurality of light sources, each of the light sources being adapted to provide a spatially coherent, composite beam of light, each of...
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6058226 |
Optical fiber sensors, tunable filters and modulators using long-period gratings
An optical system for selectively filtering and modulating light transmitted through an optical fiber. A tunable optical filter is provided which is capable of selectively correcting, amplifying or...
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6052497 |
System comprising acousto-optic tunable filter
A system, e.g., a wavelength division multiplexed optical network, having a tunable add/drop filter is provided. The filter of the invention contains a substrate having a waveguide capable of...
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6043926 |
Electro-optical broadband microwave frequency shifter
The broadband microwave frequency shifter is an electro-optical device that accomplishes frequency shifting, or translation by the use of serrodyning or mixing techniques. A first optical signal is...
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6014479 |
High channel density wavelength division multiplex (WDM) optical transmission system and method with negligible four-wave mixing (FWM) penalty
A source/transmission fiber strategy results in a WDM system with negligible FWM penalty even for closely-spaced channels. The combined performance of a source which provides chirped wavelength...
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5985472 |
Magnetostatic wave device
There is provided a magnetostatic wave device which operates even with a substitution R, A:YIG having a small film thickness and which has a wider operational frequency band. A magnetostatic wave...
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5982958 |
Optical waveguide modulator device
An improved optical waveguide device having an optical waveguide for guiding a lightwave comprises, on a surface of a substrate having an electrooptical effect, at least a pair of electrodes...
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5970188 |
Method and apparatus for controlling an optical signal
The invention is a method and apparatus that provides for the control of optical signals in a polarization-independent manner using birefringence. The invention includes an optical coupler...
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5966476 |
Spatial switch using an optical beam steering device
A spatial switch of a simple structure using a "M×N" optical beam steering device which operates with M "1×N" spatial switches using a phased optical waveguide array. The spatial switch using an...
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5949941 |
Cladding-pumped fiber structures
A cladding-pumped fiber structure is disclosed in which mode mixing of pump light injected into the fiber is induced by index modulation. In one embodiment, the index modulation is created by a...
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5949925 |
Method, device, and system for optical modulation in wavelength division multiplexing
An optical modulator including an optical waveguide structure and a selective modulation unit. The optical waveguide structure guides wavelength division multiplexed light including a plurality of...
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5937118 |
Quantum synthesizer, THz electromagnetic wave generation device, optical modulation device, and electron wave modulation device
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...
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5917969 |
Laser modulator
An all-optical modulator for modulating the output power of a high-power optical pump source is disclosed. More particularly, with the optical modulator of the invention, the output power of a CW...
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5917648 |
Packaged optical amplifier assembly
A packaged optical amplifier assembly includes an erbium doped silica based optical amplifying fiber (330) co-pumped and counter-pumped by a pair of laser diodes (336) as optical pumps. The optical...
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5911015 |
Polarization-independent Kerr modulator, and an all-optical clock recovery circuit including such a modulator
The invention relates to a Kerr type optical modulator and to an all-optical clock recovery circuit operating by active mode locking of a fiber loop laser including such a modulator. Operation is...
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5907645 |
Liquid crystal ferroelectric electro-optical phase modulators which are insensitive to polarization
The modulator is formed by a smectic chiral ferroelectric C* liquid crystal cell (CL), crossed by the light signal which is transmitted by the said fibre. The cell (CL) is provided with transparent...
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5903683 |
Device for modulating an optical signal using a single wave guide
The present invention is a device for adding delay and compensating for dispersion in an optical signal. In a first embodiment, the present invention is made up of a waveguide, preferably an...
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5903684 |
Independent control of one of normally interdependent light transmission characteristics of optical fiber
A method and apparatus for controlling polarization, as one of a pair of erdependent light characteristics of an optical fiber, in response to a time dependent signal without the introduction of...
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5898517 |
Optical fiber modulation and demodulation system
A fiber optic modulation and demodulation system is disclosed. The system is configured as telemetry system for relaying signals from sensors in remote, harsh environments. Light is modulated using...
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5892857 |
Electro-optic compound waveguide intensity modular and method using same
An electro-optic modulator is disclosed in the form of a compound waveguide device having a channel waveguide in optical proximity to an elongate waveguide propagating an optical signal therein....
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5887092 |
Optical non-linear branching element with MZ interferometer
A low-loss optical 1×2 branching element comprises a symmetrical coupler (C s ) with a symmetrical power distribution (1/2/1/2) and an asymmetric coupler (C a )with an asymmetric power...
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