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7620284 |
Optical waveform shaping device including portions for respectively absorbing and amplifying transmitted optical signal
An optical waveform shaping device includes a first waveguide portion, formed on a substrate, for transmitting the optical signal and simultaneously absorbing a portion of the optical signal, which...
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7616843 |
Optical functional device and fabrication process of the same
Arranged for at least one of a pair of branch optical waveguides in a Mach-Zehnder type interference optical system is a ring resonance type phase shifter for modulating a light wave signal...
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7616618 |
Code cycle modulation in optical code division multiple access systems
An optical code division multiple access (OCDMA) system includes an optical transmitter system configured to transmit data from a plurality of users through a shared optical channel by encoding the...
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7606447 |
Mach-Zehnder type semiconductor device and method of controlling the same
A Mach-Zehnder type semiconductor device includes electrodes for injecting carriers into first and second branch waveguides so as to change reflection indexes of the first and second branch...
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7603002 |
Optical device
An optical device having a substrate having an electro-optical effect, an optical waveguide formed in the substrate, and an electric field emission electrode, and an electric field convergence...
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7599595 |
Semiconductor optoelectronic waveguide
The present invention relates to a semiconductor optoelectronic waveguide having a nin-type hetero structure which is able to stably operate an optical modulator. On the upper and lower surfaces of...
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7590313 |
Phased-array optical whispering gallery mode modulation and method
A whispering gallery mode (WGM) resonator device and method capable of filtering sidebands of optical modulators are provided. The method includes providing an optical resonator adapted to support...
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7590312 |
Interferometer optical switch and variable optical attenuator
The present invention discloses an interferometer optical switch that can carry out switching over a broad band and has a high extinction ratio and large fabrication tolerance. The interferometer...
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7583868 |
3R recovery system
A full 3R (re-timing, re-shaping, re-amplifying) recovery system is provided. In the full 3R recovery system, a self-pulsating laser diode (SP-LD) and an electroabsorption modulator (EAM) are...
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7580594 |
Optical modulation element and optical modulation device having the same
An optical modulation element includes a waveguide defined based on a defect in a photonic crystal, a carrier conducting region for conducting a carrier to the waveguide, an electrode for injecting...
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7577367 |
Optical communication using duobinary modulation
Optical techniques, devices and systems for combining duobinary modulation and optical subcarrier multiplexing in optical communication applications. An analog mixer is used to mix a duobinary...
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7570843 |
Optical modulation element module
The present invention provides an optical modulation element module which is capable of the optical modulation for analog transmission with a low driving voltage and low chirp. An optical...
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7567736 |
Waveguide type wavelength domain optical switch
A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light...
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7561806 |
Method and system for keeping timing alignment between driving signals in optical double modulation
A method and system is disclosed for making timing alignment for a data transmission system, the method comprising providing a reference clock signal with a first frequency to a multiplexer through...
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7561760 |
System and method for optical beam steering using nanowires and method of fabricating same
An apparatus and a method for steering optical frequency beams using nanowire. A method includes providing one or more nanowire waveguide arrays, generating an optical frequency beam, wherein the...
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7561759 |
Optical modulator
Optical modulator devices exhibiting improved response characteristics are constructed from a ring resonator having a tunable loss element positioned within the ring resonator structure and one or...
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7558456 |
Optical waveguide device
An optical waveguide device includes a lower cladding layer, a high refractive index region provided on the lower cladding layer, a pair of cores provided on the lower cladding layer on both sides...
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7558444 |
Traveling-wave-type optical modulator and method of adjusting the same
To provide a traveling-wave-type optical modulator and a method of adjusting the same, in which an occurrence of a jitter can be suppressed when an optical modulator is driven by using a driver,...
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7555226 |
Automatic bias control for an optical modulator
An automatic bias controller for an optical modulator is provided. The automatic bias controller comprises a driver for providing an electrical data signal to the modulator and a bias voltage...
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7546017 |
Electro-photonic modulators
Various embodiments of the present invention are directed to modulators that can be operated electronically and used to modulate electromagnetic radiation. In one embodiment of the present...
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7542630 |
High speed optical phase modulator
An optical device includes a phase modulator having a waveguide on a substrate. The phase modulator also includes an n-type region having a proximity to a p-type region that causes formation of a...
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7539359 |
Systems and methods for chirp control of a dual arm Z-modulator to minimize dispersion effect of fiber plant
The present invention provides systems and methods for chirp control of a dual arm Z-modulator to minimize dispersion in the fiber plant. The chirp control is based upon a real-time control loop...
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7536065 |
Electro-optic gap-cell for waveguide deployment
The present invention provides an electro-optic gap-cell for waveguide deployment, including a first optical transmission medium formed in at least a portion of a device layer, a second optical...
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7532778 |
Optical waveguide modulator equipped with an output light monitor
An optical waveguide element having a plurality of surface waveguide portions. A connecting portion for connecting the surface waveguide portions. An output light-outputting waveguide portion...
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7532777 |
Optical functional devices
An optical functional device has a slab type two-dimensional photonic crystal layer. The photonic crystal layer has a dielectric layer and a plurality of lattice columns each comprising dielectric...
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7532776 |
Optical element and optical switch
A core layer of an optical waveguide is grown as a film comprised of an electro-optic material with a rhombohedral structure and grown above a substrate with (100) crystal orientation on a major face.
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7526209 |
Optical frequency shift keying modulator
An optical FSK modulator which can be used for an optical information communication is provided. The optical FSK is provided with: a second sub Mach-Zehnder waveguide (MZ B ) 3 ; a main...
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7519249 |
Semiconductor optical modulator
Semiconductor optical modulator devices exhibiting improved chirp characteristics are constructed from a Mach-Zehnder structure having resonators positioned within each arm and a number of phases...
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7519241 |
Optical device
The present invention relates to an optical device including a branching unit for making branches of incident light in a first branch ratio, a phase adjusting unit for adjusting the relationship in...
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7519240 |
Multi-section coupler to mitigate guide-guide asymmetry
A wavelength independent multi-section optical coupler having at least three optical couplers, and at least two differential phase cells. Each optical coupler has two waveguides forming a coupling...
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7515778 |
Segmented optical modulator
An optical modulator is formed to include an adjustable drive arrangement for dynamically adjusting the effective length of the optical signals path(s) within the modulator. Each modulator arm is...
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7515776 |
Temperature-controlled optical modulator
SiGe quantum wells where the well material has a lowest conduction band energy minimum at k=0 (the Γ point of the first Brillouin zone) are provided. Quantum well structures that satisfy this...
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7515775 |
Distributed amplifier optical modulator
Various embodiments described herein comprises an optoelectronic device comprising a waveguide structure including a plurality of optical modulator elements each having an optical property that is...
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7509003 |
Optical waveguide, optical device, and manufacturing method of the optical waveguide
An optical waveguide has a diffusion area (optical waveguide) with a high refractive index formed by diffusing impurities on a substrate. The diffusion area has a bent portion, and the optical...
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7499612 |
Multimode planar waveguide spectral filter
A spectral filter comprises a planar optical waveguide having at least one set of diffractive elements. The waveguide confines in one transverse dimension an optical signal propagating in two other...
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7499603 |
Range extended electrooptic modulator
Methods, systems, and devices are provided for an electrooptical modulator. One method embodiment includes receiving an optical input signal to an electrooptical modulator. A first voltage input is...
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7492975 |
Optical switch, optical modulator and wavelength variable filter
The present invention provides an optical switch, an optical modulator, and a wavelength variable filter each of which has a simple configuration, which requires only a low driving voltage, which...
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7486897 |
Polarization duobinary optical transmitter
A polarization duobinary optical transmitter is disclosed. The transmitter includes a precoder for coding an electric signal and a light source for generating continuous light. The transmitter also...
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7483609 |
Image wavelength conversion device, method of manufacturing the device, and image conversion system using the device
An image wavelength conversion device for converting an infrared light image into a visible light, a method of manufacturing the device, and an image conversion system using the device are...
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7483597 |
Optical modulator utilizing multi-level signaling
An optical modulator is formed to include a plurality of separate electrodes disposed along one arm, the electrodes having different lengths and driven with different signals to provide for...
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7474812 |
Monitor photodetector equipped optical modulator
An optical modulator has, on a substrate having electro-optic effect, an optical waveguide including an input optical waveguide, two branching optical waveguides which branch a light beam incident...
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7471853 |
Optical modulator
In an optical modulator according to the invention, with respect to two MZ type optical modulators connected to each other in tandem by a curved folded waveguide on an identical substrate, a...
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7469075 |
Digital phase modulator for a fiber-optic device
A method and arrangement of electrodes for increasing the resolution of a digital phase modulator for a fiber-optic signal transmission or measuring device. A predetermined total number m of...
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7457489 |
Frequency tuning of photonic oscillator using amplifier bias voltage
In one implementation, a method is provided for frequency tuning of a photonic oscillator. The method includes supplying an optical signal, for example laser light, which is modulated, delayed, and...
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7457487 |
Surface parallel modulator
SiGe quantum wells where the well material has a lowest conduction band energy minimum at k=0 (the Γ point of the first Brillouin zone) are provided. Quantum well structures that satisfy this...
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7450787 |
Distributed amplifier optical modulators
High speed optical modulators can be made of k modulators connected in series disposed on one of a variety of semiconductor substrates. An electrical signal propagating in a microwave transmission...
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7447443 |
Method and system for keeping time alignment between optical data modulation and a periodically modulated light source
A method and system is disclosed for making time alignment for a data transmission system. A first reference clock signal is provided to a first multiplexer coupled to a data modulator through a...
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7447386 |
Cascaded modulator system and method for QKD
A cascaded modulator system ( 20 ) and method for a QKD system ( 10 ) is disclosed. The modulator system includes to modulators (M 1 and M 2 ) optically coupled in series. A parallel shift...
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7440643 |
Variable light controlling device and variable light controlling method
A variable light controlling device comprising a substrate, an optical waveguide disposed on the substrate, a first heater and a second heater to change the optical waveguide's temperature is...
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7440642 |
Integrated optical modulator and method for manufacturing the same
An integrated optical modulator and method for manufacturing thereof are disclosed. The integrated optical modulator comprises a carrier wave band modulator using a double sideband modulation...
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