Abstract:
There is provided a multi-junction solar cell that reduces contact resistance of a junction portion and is capable of performing energy conversion with high efficiency. The multi-junction solar cell includes a plurality of sub-cells 11, 12, 13, and 14 that are laminated, the plurality of sub-cells 11, 12, 13, and 14 being configured of a plurality of compound semiconductor layers 11A, 11B, 11C, 12A, 12B, 12C, 13A, 13B, 13C, 14A, 14B, and 14C that are laminated. Amorphous connection layers 20A and 20B made of electrically-conductive material are provided in at least one place between the sub-cells 12 and 13 adjacent to each other.
Abstract:
The invention describes an integrated-photonics arrangement, implementable in a multi-guide vertical integration (MGVI) structure composed from III-V semiconductors and grown in one epitaxial growth run, allowing for the integration of semiconductor optical amplifier (SOA) and PIN photodetector (PIN) structures within a common wavelength-designated waveguide of the plurality of the vertically integrated wavelength-designated waveguides forming the MGVI structure. The integration includes a wavelength filter integrated between the SOA and PIN to reduce noise within the PIN arising from ASE generated by the SOA. In exemplary embodiments of the invention, the wavelength filter is integrated into MGVI structure either within a common wavelength designated waveguide or within the wavelength-designated waveguide. Further in other embodiments the wavelength filter is provided by a thin-film filter abutting a facet of the integrated-photonics arrangement wherein optical signals are coupled by optical waveguides and/or additional optical elements such as a multimode interference device.
Abstract:
A semiconductor laser device comprising a laser diode with an integrated photodiode, wherein one of the components of the laser diode with the integrated photodiode is also used for heating the laser diode. A simpler design of a wavelength-controlled semiconductor laser is thus obtained.
Abstract:
The invention describes an integrated-photonics arrangement, implementable in a multi-guide vertical integration (MGVI) structure composed from III-V semiconductors and grown in one epitaxial growth run, allowing for the integration of semiconductor optical amplifier (SOA) and PIN photodetector (PIN) structures within a common wavelength-designated waveguide of the plurality of the vertically integrated wavelength-designated waveguides forming the MGVI structure. The integration includes a wavelength filter integrated between the SOA and PIN to reduce noise within the PIN arising from ASE generated by the SOA. In exemplary embodiments of the invention, the wavelength filter is integrated into MGVI structure either within a common wavelength designated waveguide or within the wavelength-designated waveguide. Further in other embodiments the wavelength filter is provided by a thin-film filter abutting a facet of the integrated-photonics arrangement wherein optical signals are coupled by optical waveguides and/or additional optical elements such as a multimode interference device.
Abstract:
A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.
Abstract:
The CMOS field effect transistors, used in microprocessors and other digital VLSI circuits, face major challenges such as thin gate dielectrics leakage and scaling limits, severe short channel effects, limited performance improvement with scaling, complicated fabrication process with added special techniques, and surface mobility degradation. This disclosure proposes a new CMOS-compatible optoelectronic transistor. The current is much higher than the MOS transistors, due to the high carrier mobility with bulk transportation. The optoelectronic transistors are scalable to the sub-nanometer ranges without short channel effects. It is also suitable for low power applications and ULSI circuits. The new transistor consists of a laser or LED diode as drain or source, and a photo sensor diode (avalanche photo diode) as source or drain. The transistor is turned on by applying a gate voltage, similar to the CMOS transistors, and a laser or LED light signal is sent to the nearby photo diode, causing an avalanche breakdown and high drain current. The transistor is surrounded by dielectrics and metal isolations, which serve as a metal box or cavity, so the generated laser or LED lights are confined and reflected back from the metal. The drain current increases exponentially with the drain or gate voltage. This exponential drain current vs. drain or gate voltage characteristics makes the optoelectronic transistor run much faster than the transitional linear MOSFET.The optic transistor current-voltage characteristics are totally different from transitional CMOS transistors.
Abstract:
A phase-conjugating resonator that includes a semiconductor laser diode apparatus that comprises a phase-conjugating array of retro-reflecting hexagon apertured hexahedral shaped corner-cube prisms, an electrically and/or optically pumped gain-region, a distributed bragg reflecting mirror-stack, a gaussian mode providing hemispherical shaped laser-emission-output metalized mirror. Wherein, optical phase conjugation is used to neutralize the phase perturbating contribution of spontaneous-emission, acoustic phonons, quantum-noise, gain-saturation, diffraction, and other intracavity aberrations and distortions that typically destabilize any stimulated-emission made to undergo amplifying oscillation within the inventions phase-conjugating resonator. Resulting in stabilized high-power laser-emission-output into a single low-order fundamental transverse cavity mode and reversal of intra-cavity chirp that provides for high-speed internal modulation capable of transmitting data at around 20-Gigabits/ps.
Abstract:
The invention relates to a method of fabricating an optical device for analysing a scene, comprising an emitter and a detector in the mid-infrared or far-infrared, characterized in that it comprises: the production of a stack of semiconductor layers grown epitaxially on the surface of a semiconductor substrate, certain layers of which are doped; the production of a first, quantum cascade laser emission device (L) emitting an analysis beam in the mid-infrared or far-infrared, from a first level called the emission level, into the stack of semiconductor layers; and the production of a second, quantum detector device (D) capable of detecting a beam backscattered by the scene to be analysed, at the same level in the stack as the emission level.
Abstract:
A phase-conjugating resonator that includes a semiconductor laser diode apparatus that comprises a phase-conjugating array of retro-reflecting hexagon apertured hexahedral shaped corner-cube prisms, an electrically and/or optically pumped gain-region, a distributed bragg reflecting mirror-stack, a gaussian mode providing hemispherical shaped laser-emission-output metalized mirror. Wherein, optical phase conjugation is used to neutralize the phase perturbating contribution of spontaneous-emission, acoustic phonons, quantum-noise, gain-saturation, diffraction, and other intracavity aberrations and distortions that typically destabilize any stimulated-emission made to undergo amplifying oscillation within the inventions phase-conjugating resonator. Resulting in stablized high-power laser-emission-output into a single low-order fundamental transverse cavity mode and reversal of intra-cavity chirp that provides for high-speed internal modulation capable of transmitting data at around 20-Gigabits/ps.
Abstract:
A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.