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7627011 |
Distributed feedback laser diode and a method for manufacturing the same
The present invention is to provide a DFB-LD with a larger coupling efficiency between the grating and the active layer. The DFB-LD of the invention provides an n-type InP substrate, an n-type InP...
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7618201 |
Optical module
An optical-waveguide device mounted on a fixing member having a pair of opposing upright walls and a sub-mount unit including a metallic sub-mount of a rectangular solid shape inserted between the...
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7620093 |
Laser device, laser module, semiconductor laser and fabrication method of semiconductor laser
A semiconductor laser has first and second diffractive grating regions. The first diffractive grating region has segments, has a gain, and has first discrete peaks of a reflection spectrum. The...
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7609744 |
Laser resonator comprising an internal beam splitter
A simple and compact laser resonator is proposed which makes it possible to symmetrically operate a gain medium, preferably a semiconductor, which possesses more than one channel of emission. As a...
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7609919 |
Coupling-enhanced surface etched gratings
The invention describes the method and apparatus for enhancement of coupling efficiency in effective-ridge laterally-coupled surface-etched grating waveguide structures, where a slab waveguide has...
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7606284 |
Semiconductor laser structure including quantum dot
Provided is a distributed feedback semiconductor laser structure including: a first clad layer; a first ridge waveguide formed on the first clad layer; an active layer formed on the first ridge...
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7596165 |
Distributed Bragg Reflector for optoelectronic device
A Distributed Bragg Reflector (DBR) that has relatively low light absorption, relatively low electrical resistance, and/or relatively good thermal conductivity. The DBR may include a first mirror...
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7593448 |
Semiconductor laser module and optical transmission apparatus using the semiconductor laser module
A semiconductor laser module includes a distributed-feedback laser. When a predetermined transmission loss, a predetermined number of channels, and a predetermined modulation factor per channel are...
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7586970 |
High efficiency partial distributed feedback (p-DFB) laser
A second-order multi-mode partial distributed feedback (p-DFB) laser having increased electrical-to-optical power conversion efficiency, stabilized wavelength and narrowed emission linewidth. The...
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7583719 |
Complex-coupled distributed feedback semiconductor laser
A distributed feedback semiconductor laser may have (1) a controlled complex-coupling coefficient which is not affected by grating etching depth variation, and (2) facet power asymmetry with no...
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7564889 |
Adiabatically frequency modulated source
A Distributed Feed-Back (DFB) laser integrated with an Electroabsorption (EA) modulator whose facet at the end of EA modulator section has finite reflectively to create adiabatic chirp by optical...
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7551662 |
Distributed feedback (DFB) quantum dot laser structure
A distributed feedback (DFB) quantum dot semiconductor laser structure is provided. The DFB quantum dot semi-conductor laser structure includes: a first clad layer formed on a lower electrode; an...
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7548567 |
Analog transmitter using an external cavity laser (ECL)
The present invention relates to an analog transmitter using an external cavity laser (ECL) in which specific characteristics of the ECL are enhanced and exploited to improve 2nd and 3rd order...
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7542503 |
Distributed feedback laser with improved optical field uniformity and mode stability
A directly modulated distributed feedback (DFB) laser with improved optical field uniformity and mode stability may include a laser cavity and a distributed reflector and/or external reflectors....
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7529279 |
Tuneable laser
A tuneable laser includes a gain section ( 50 ) bounded by two mirrors ( 51 and 52 ) at least one mirror being a chirp grating. At least one of the mirrors includes a plurality of selectable...
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7519095 |
Vertical-cavity, surface-emission type laser diode and fabrication process thereof
A vertical-cavity, surface-emission-type laser diode includes an optical cavity formed of an active region sandwiched by upper and lower reflectors, wherein the lower reflector is formed of a...
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7496127 |
Optical device coupling light propagating in optical waveguide with diffraction grating
An optical waveguide propagates a laser beam. Main diffraction grating and sub-diffraction grating couple light propagating in the optical waveguide. The main diffraction grating and the...
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7483603 |
Optical device and method for manufacturing the same, optical module, and optical transmission device
Exemplary embodiments of the present invention provide optical devices including optical members whose disposed positions, shapes and sizes are excellently controlled, and methods for manufacturing...
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7474683 |
Distributed feedback semiconductor laser
A distributed feedback semiconductor laser comprises a first cladding layer, a first optical guide layer, an active layer, a second optical guide layer, an InP semiconductor layer, an InGaAsP...
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7457341 |
Low loss grating for high efficiency wavelength stabilized high power lasers
A low optical loss and high efficiency grating is placed within a broad-area high-power laser diode or single spatial mode laser diode to narrow the spectral width and stabilize the emission...
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7457338 |
Quantum well lasers with strained quantum wells and dilute nitride barriers
In accordance with the present invention, GaAs-based optoelectronic devices have an active region that includes a well layer composed of a compressively-strained semiconductor that is free, or...
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7446293 |
Electro-optical element and method for manufacturing thereof, optical module and method for driving thereof
An electro-optical element is provided including a light-emitting element part and a light-receiving element part, wherein an optical thickness d of the light-receiving element part satisfies the...
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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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7421003 |
Emission wavelength-programmable organic distributed feedback laser
An organic distributed feedback layer, which comprises a resonator in a double layer structure comprising a photo-induced mass transfer material layer and an organic fluorescence layer, provided as...
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7411992 |
Light wavelength converting apparatus, control method of the same, and image projecting apparatus using the same
A light wavelength converting apparatus includes a semiconductor laser having gain, phase, and DBR regions, a nonlinear optical device for receiving fundamental-wave light emitted from the...
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7394838 |
Control for a tunable laser
A control ( 20 ) and a method of controlling a tunable laser having a gain section ( 4 ), a phase change section ( 5 ) and a segmented Bragg grating reflector section ( 6 ) comprising a series of...
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7376309 |
Optical structure
An optical structure comprising an optical resonator is provided. The optical resonator comprises a first set of nested closed optical regions, forming a distributed feedback resonator structure...
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7376161 |
Modulation light source, image display apparatus including the same, and method of driving modulation light source
A modulation light source capable of maintaining thermal stability of a gain part is provided. A modulation light source includes a DBR laser having a DBR part, a phase part and a gain part, a...
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7359423 |
Distributed feedback laser diode
A semiconductor laser includes an active layer on an n-type InP substrate. A diffraction grating and a p-type InP cladding layer are above the active layer. The diffraction grating has at least one...
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7339968 |
Current biased dual DBR grating semiconductor laser
Dual-wavelength operation is easily achieved by biasing the gain section. Multiple gratings spaced apart from each other are separated from an output aperture by a gain section. A relatively low...
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7333526 |
Coarse spectrometer with a grating
A quasi-monochromatic light beam carrier for a particular telecommunication channel is likely to experience drift because of age, temperature, or other factors, and may cause the centroid...
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7298771 |
Use of volume Bragg gratings for the conditioning of laser emission characteristics
Apparatus and methods for altering one or more spectral, spatial, or temporal characteristics of a light-emitting device are disclosed. Generally, such apparatus may include a volume Bragg grating...
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7294863 |
Micro-lens built-in vertical cavity surface emitting laser
A micro-lens built-in vertical cavity surface emitting laser (VCSEL) includes a substrate and a lower reflector formed on the substrate. An active layer is formed on the lower reflector, generating...
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7295589 |
Frequency modulated vertical cavity laser
A frequency modulated (FM) vertical cavity surface emitting laser (VCSEL). The frequency modulated VCSEL includes a mirror region that has an active region. The frequency modulated VCSEL also...
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7286588 |
Semiconductor laser with grating structure for stabilizing the wavelength of optical radiation
An optoelectronic device having a semiconductor laser diode and a grating structure for stabilizing the optical wavelength of optical radiation generated by the laser diode.
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7283573 |
Optical microwave source
A simple, tuned monolithic integrated component for the generation of optical microwaves in the frequency range of from 0.5 GHz to the THz range by means of an optical microwave source, embodied as...
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7277465 |
Semiconductor laser
In a refractive index coupling distributed semiconductor laser having a Λ/2-phase-shift distributed feedback structure with a diffraction grating having a refractive index coupling property on an...
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7262758 |
Display device using vertical cavity laser arrays
A display apparatus for producing colored pixelated light includes a backlight unit for providing a pump-beam light. The apparatus also includes a microcavity light-producing array responsive to...
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7257137 |
Tuneable laser having comb reflectors producing combs of reflective wavelength peaks
A tuneable laser is disclosed, including a gain section with first and second comb reflectors to one side thereof. The two reflectors each provide combs with substantially uniform spacings, the...
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7254154 |
DFB laser with a distributed reflector and photonic band gap
The invention relates to a semiconductor laser consisting of an active waveguide comprising an active region surrounded by a filling material and which is coupled to a distributed reflector. Said...
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7251264 |
Distributed bragg reflector for optoelectronic device
This disclosure concerns devices such as DBRs, one example of which includes at least one first mirror layers having an oxidized region extending from an edge of the DBR to an oxide termination...
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7248616 |
Bidirectional transceiver and method for driving the same
There are provided a bi-directional transceiver module and a method for driving the same. The bi-directional transceiver module includes a 1.3 μm Distributed Bragg Reflection Laser Diode (DBR LD)...
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7224875 |
Semiconductor optical device integrated with a photo detector
The present invention provides a semiconductor optical device 1 that includes a photodiode capable of monitoring front light of the light-emitting device. The optical device 1 includes a...
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7218660 |
Single-mode vertical cavity surface emitting lasers and methods of making the same
In one aspect, a vertical cavity surface emitting laser (VCSEL) is operable to generate single-mode laser light at an operative wavelength. The VCSEL includes a light-emitting surface and a...
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7184627 |
Optical waveguide grating coupler incorporating reflective optical elements and anti-reflection elements
An optical wavelength grating coupler incorporating one or more distributed Bragg reflectors (DBR) or other reflective elements to enhance the coupling efficiency thereof. The grating coupler has a...
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7180930 |
DFB semiconductor laser device having ununiform arrangement of a diffraction grating
A DFB semiconductor laser device includes a diffraction grating extending parallel to a laser cavity. The diffraction grating has ununiform structure wherein some of the corrugation patterns of...
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7180929 |
Wafer-level test structure for edge-emitting semiconductor lasers
Wafer-level stage testing of semiconductor lasers can be facilitated by directing a light beam emitted from the semiconductor laser toward a direction different from a path of the light beam as...
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7180923 |
Laser employing a zinc-doped tunnel-junction
An improved tunnel junction structure and a VCSEL that uses this structure is disclosed. The tunnel junction includes first, second, and third layers that include materials of the InP family of...
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7177340 |
Extended cavity laser device with bulk transmission grating
A laser apparatus is disclosed utilizing a laser diode having a reflective back facet and a front facet having a reflectance of less than about 1% for emitting an optical beam at a fundamental...
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7177061 |
Semiconductor optical modulator having a quantum well structure for increasing effective photocurrent generating capability
An optical modulator comprises a first waveguide layer and a barrier layer, and a quantum well layer sandwiched between the first waveguide layer and the barrier layer, where the quantum well layer...
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