摘要:
Method and apparatus for the continuous high speed switching or modulation of light with light. A flow medium containing an active coupling medium is flowed relative to the light beams so as to continually restore the coupling medium which is degraded by interaction with the light beam, thereby maintaining the coupling medium in a desired condition for modulating a light beam. The problem of removal of heat generated by light power dissipation is eliminated by advective flow of the medium.
摘要:
Methods and structures are disclosed demultiplexing optical signals transmitted over an optical fiber into a silicon substrate and to multiple detectors. The silicon substrate has two spaced-apart surfaces and a diffractive element disposed adjacent to one of the surfaces. Each of the optical signals corresponds to one of multiple wavelengths. The optical signals are directed into the silicon substrate along a path through the first surface to be incident on the diffractive element. The path is oriented generally normal with the first surface and/or with the diffractive element, which angularly separates the optical signals such that each of the wavelengths traverses through the substrate in a wavelength dependent direction to the first surface. Each optical signal is steered from the first surface towards the second surface to be incident on different optical elements that direct them generally normal to the first surface to be incident on one of the detectors.
摘要:
A method of fabricating a detector, the method including forming an island of detector core material on a substrate, the island having a horizontally oriented top end, a vertically oriented first sidewall, and a vertically oriented second sidewall that is opposite said first sidewall; implanting a first dopant into the first sidewall to form a first conductive region that has a top end that is part of the top end of the island; implanting a second dopant into the second sidewall to form a second conductive region that has a top end that is part of the top end of the island; fabricating a first electrical connection to the top end of the first conductive region; and fabricating a second electrical connection to the top end of the second conductive region.
摘要:
A circuit for generating a clock or sampling signal, the circuit including: a semiconductor quantum dot laser element including a region of quantum dots, wherein the region of quantum dots is characterized by an emission distribution having a half-width of at least about 10 meV; and drive circuitry connected to the quantum dot laser element for operating the quantum dot laser element as a mode-locked laser that outputs a periodic, uniformly spaced sequence of pulses, wherein the clock or sampling signal is derived from the sequence of pulses.
摘要:
An optical electronic integrated circuit (OEIC) having optical waveguides as device interconnects. An optical waveguide is formed by depositing, in an oxygen-free atmosphere, a film of semiconductor material on a semiconductor substrate at a temperature that substantially diminishes the porosity of the film and the diffusion of material from the substrate into the film. The semiconductor film, which has an index of refraction greater than that of the substrate, is etched to form the optical waveguide on the substrate. The substrate also supports a plurality of active optical devices between which the optical waveguide extends. The substrate is preferably formed from gallium-arsenide and the waveguide from germanium. The active devices may also include these materials as well as aluminum-gallium-arsenide.
摘要:
An optical electronic integrated (circuit (OEIC) having optical waveguidess device interconnects. An optical waveguide is formed by depositing, in an oxygen-free atmosphere, a film of semiconductor material on a semiconductor substrate at a temperature that substantially diminishes the porosity of the film and the diffusion of material from the substrate into the film. The semiconductor film, which has an index of refraction greater than that of the substrate, is etched to form the optical waveguide on the substrate. The substrate also supports a plurality of active optical devices between which the optical waveguide extends. The substrate is preferably formed from gallium-arsenide and the waveguide from germanium. The active devices may also include these materials as well as aluminum-gallium-arsenide. When using these materials, the germanium film is deposited in an oxygen-free environment at about 100 degrees centigrade.