Abstract:
Methods are disclosed of fabricating an optical assembly. An active optical element is disposed near or on a first surface of a slab of optical material. A passive optical element is formed on a second surface of the slab, with the second surface being substantially parallel to the first surface. An optical axis of the passive optical element is aligned with an optical path between the passive optical element and an active region of the active optical element using a lithographic alignment process.
Abstract:
A method of fabricating a detector that involves: forming a trench in a substrate, the substrate having an upper surface; forming a first doped semiconductor layer on the substrate and in the trench; forming a second semiconductor layer on the first doped semiconductor layer and extending into the trench, the second semiconductor layer having a conductivity that is less than the conductivity of the first doped semiconductor layer; forming a third doped semiconductor layer on the second semiconductor layer and extending into the trench; removing portions of the first, second and third layers that are above a plane defined by the surface of the substrate to produce an upper, substantially planar surface and expose an upper end of the first doped semiconductor layer in the trench; forming a first electrical contact to the first semiconductor doped layer; and forming a second electrical contact to the third semiconductor doped layer.
Abstract:
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.
Abstract:
An optoelectronic circuit including: an IC chip made up of a substrate in which an optical waveguide and a mirror have been fabricated, the substrate having a first lens formed thereon, wherein the mirror is aligned with the optical waveguide and the first lens is aligned with the mirror to form an optical path connecting the first lens, the mirror, and the optical waveguide; and an optical coupler including a second lens, the optical coupler affixed to the substrate and positioned to align the second lens with the first lens so as to couple an optical signal into or out of the optical waveguide within the IC chip.
Abstract:
An article of manufacture comprising an optical-ready substrate made of a first semiconductor layer, an insulating layer on top of the first semiconductor layer, and a second semiconductor layer on top of the insulating layer, wherein the second semiconductor layer has a top surface and is laterally divided into two regions including a first region and a second region, the top surface of the first region being of a quality that is sufficient to permit microelectronic circuitry to be formed therein and the second region including an optical signal distribution circuit formed therein, the optical signal distribution circuit made up of interconnected semiconductor photonic elements and designed to provide signals to the microelectronic circuit to be fabricated in the first region of the second semiconductor layer.
Abstract:
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.
Abstract:
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.
Abstract:
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.