Abstract: A photodetector with a bandwidth-tuned cell structure is provided. The photodetector is fabricated from a semiconductor substrate that is heavily doped with a first dopant. A plurality of adjoining cavities is formed in the semiconductor substrate having shared cell walls. A semiconductor well is formed in each cavity, moderately doped with a second dopant opposite in polarity to the first dopant. A layer of oxide is grown overlying the semiconductor wells and an annealing process is performed. Then, metal pillars are formed that extend into each semiconductor well having a central axis aligned with an optical path. A first electrode is connected to the metal pillar of each cell, and a second electrode connected to the semiconductor substrate. The capacitance between the first and second electrodes decreases in response to forming an increased number of semiconductor wells with a reduced diameter, and forming metal pillars with a reduced diameter.

Abstract: A photodetector with a bandwidth-tuned cell structure is provided. The photodetector is fabricated from a semiconductor substrate that is heavily doped with a first dopant. A plurality of adjoining cavities is formed in the semiconductor substrate having shared cell walls. A semiconductor well is formed in each cavity, moderately doped with a second dopant opposite in polarity to the first dopant. A layer of oxide is grown overlying the semiconductor wells and an annealing process is performed. Then, metal pillars are formed that extend into each semiconductor well having a central axis aligned with an optical path. A first electrode is connected to the metal pillar of each cell, and a second electrode connected to the semiconductor substrate. The capacitance between the first and second electrodes decreases in response to forming an increased number of semiconductor wells with a reduced diameter, and forming metal pillars with a reduced diameter.

Abstract: A pattern method is provided for testing an optical lens. The method provides a lens for test, including a first lens surface with a focal plane in object space and a second lens surface with a focal plane in image space. Also provided is a pattern test fixture including an imaging device and a target pattern. The lens is positioned so that the imaging device is located outside the object space focal plane and the target pattern located is outside the image space focal plane. The imaging device, such as a microscope, magnification device, human eye, or camera, is used to view the target pattern. A viewed image representation of the target pattern is received in the imaging device and compared to the target pattern. More typically, the viewed image representation is compared to a target pattern copy.

Abstract: A method is provided for demultiplexing optical signals. A first photodiode accepts first optical signals in a first range of wavelengths with second optical signals in a second range of wavelengths greater than the first range. First electrical signals are generated in the first photodiode in response to the first optical signals. A second photodiode accepts the second optical signals, and generates second electrical signals in response to the second optical signals. The first photodiode substantially absorbs photons associated with the first optical signal, and substantially passes photons associated with the second optical signals. In one aspect, the first photodiode has a first coefficient of absorption associated with the first range of wavelengths and the second photodiode has a second coefficient of absorption and a half value layer (HVL) associated with the second range of wavelengths. The first photodiode has thickness less than the HVL of the second photodiode.

Abstract: A photodetector with a bandwidth-tuned cell structure is provided. The photodetector is fabricated from a semiconductor substrate that is heavily doped with a first dopant. A plurality of adjoining cavities is formed in the semiconductor substrate having shared cell walls. A semiconductor well is formed in each cavity, moderately doped with a second dopant opposite in polarity to the first dopant. A layer of oxide is grown overlying the semiconductor wells and an annealing process is performed. Then, metal pillars are formed that extend into each semiconductor well having a central axis aligned with an optical path. A first electrode is connected to the metal pillar of each cell, and a second electrode connected to the semiconductor substrate. The capacitance between the first and second electrodes decreases in response to forming an increased number of semiconductor wells with a reduced diameter, and forming metal pillars with a reduced diameter.

Abstract: A photodetector with a bandwidth-tuned cell structure is provided. The photodetector is fabricated from a semiconductor substrate that is heavily doped with a first dopant. A plurality of adjoining cavities is formed in the semiconductor substrate having shared cell walls. A semiconductor well is formed in each cavity, moderately doped with a second dopant opposite in polarity to the first dopant. A layer of oxide is grown overlying the semiconductor wells and an annealing process is performed. Then, metal pillars are formed that extend into each semiconductor well having a central axis aligned with an optical path. A first electrode is connected to the metal pillar of each cell, and a second electrode connected to the semiconductor substrate. The capacitance between the first and second electrodes decreases in response to forming an increased number of semiconductor wells with a reduced diameter, and forming metal pillars with a reduced diameter.

Abstract: An optical multi-chip module (MCM) is provided. A printed circuit board (PCB) overlies a package bottom and has die contact regions, each having at least one electrical interface. A first die contact region is formed in a PCB top surface recess, and an optical component die has a bottom surface with an area about matching the PCB top surface recess. The optical component die has an optical port with microlens. An electrical component die has a bottom surface with at least one electrical interface connected to the second die electrical interface, which is connected to the first die electrical interface via a PCB trace. A wire bond is connected between the electrical component die and a package interconnection lead. A cover assembly connector has an optical port with a microlens, configured to communicate with the optical component die optical port, and a fiber port to accept an optical fiber.

Abstract: An optical element assembly with integrally formed microlens is presented. A wafer is provided with a plurality of adjacent IC optical elements, each optical element having an optical transmission port in a wafer top surface. A microlens array is attached to the wafer top surface, so that each microlens in the array overlies a corresponding optical element optical transmission port. Then, a wafer of optical elements with attached microlenses is formed, where each microlens has a first lens surface adhering directly to a corresponding optical transmission port. Subsequent to forming the wafer of optical elements with attached microlenses, the wafer is diced forming a plurality of optical element assemblies. Each optical element assembly includes an optical element integrally formed with an attached microlens.

Abstract: A method and system are provided for aligning the optic port of a device having a Free Space Optics (FSO) connector. In a link device with an FSO connector, a controller determines that an optic port alignment procedure is required. A lens is set to an initial wide beam dispersion mode, and a mirror is set to an initial position angle. Note: the lens and mirror may be the FSO connector receive path or transmit path. An optical signal is communicated at a first low baud rate, and the first baud rate communications are optimized by iteratively adjusting the mirror and narrowing the lens focus. Then, an optical signal is communicated at a second baud rate, faster than the first baud rate, and the second baud rate communications are optimized by iteratively adjusting the mirror and narrowing the lens focus.

Abstract: A Free Space Optics (FSO) connector is provided with a method for interfacing to an electronic circuit card electrical connector via the FSO connector. The method transceives electrical signals via an electronic circuit card electrical connector. Using an FSO connector, the method converts between electrical signals and optical signals, and transceives optical signals via free space. In one aspect, the optical signals are initially received via free space along a first axis, and reflected along a second axis. Further, the optical signals may be initially transmitted along the second axis and reflected into free space along the first axis. In another aspect, the optical signals are transceived in a plurality of directions in free space. For example, optical signals may be transmitted and received in four mutually-orthogonal axes.

Abstract: An off-axis misalignment compensating fiber optic cable plug is provided. The plug has a cable interface to engage a fiber optic core end, where the fiber optic core has a cross-sectional area. The plug also includes a lens having a first surface to transceive an optical signal with a jack. The first surface has a cross-sectional area at least 30 times as large as the core cross-sectional area. The lens has a second surface to transceive optical signals with the fiber optic line core end. In one aspect, the lens has an axis and the lens first surface is convex with a radius of curvature capable of receiving an optical signal beam with a beam axis of up to ±2 degrees off from the lens axis. Even 2 degrees off-axis, the lens is able to focus the beam on the fiber optic line core end.

Abstract: An optic connector jack is provided with a punch-down fiber optic cable termination. The jack is made up of a housing with a connector mating interface, for connection to a plug connector, and a cradle for receiving a fiber optic cable. The cradle has at least one U-shaped punch-down blade for securing each fiber optic cable with respect to the housing. A crimping plate overlies the cradle and mates to the housing for securing each fiber optic cable in the cradle. The U-shaped punch-down blade has an open top portion, a closed bottom portion, and an inside diameter about equal to a fiber optic cable diameter. The U-shaped punch-down blade has an interior blade edge, the interior blade edge securing a fiber optic cable by slicing into at least a part of the fiber optic cable circumference. In one aspect, the jack includes a lens for each fiber optic cable.

Abstract: A fiber optic cable is provided with a cable section including at least one length of fiber optic line having a first end and a second end. A first and second plug each have a mechanical body shaped to selectively engage and disengage a jack housing. Each plug has a microlens with a planar surface to engage the fiber optic line end and a convex surface to transceive light in a first collimated beam with a jack optical interface. The fiber optic cable ends are formed in a focal plane of a corresponding plug microlens.

Abstract: An optical-electrical processing jack is provided. The optical processing jack includes an optical jack with a jack housing having walls and an orifice for mechanically and optically engaging an optical plug housing. A signal bridge, with a bridge element, transceives optical signals between the optical plug and a backcap processing module. The backcap processing module includes a backcap housing with walls, attached to the jack housing and an optical element. The optical element has an optical interface to transceive an optical signal via the signal bridge, and convert optical signals and electrical signals transceived via an electrical interface. In one aspect, the bridge element is a lens with a first surface to transceive an optical signal with the optical plug, and a second surface to transceive the optical signal with the optical element optical interface. For example, the optical element is a photodiode or laser source.

Abstract: Fiber optic cable jacks and plugs are provided. In one aspect, a cable is made from at least one length of fiber optic line having a first end and a second end. A first plug includes a one-piece mechanical body with a cable interface to engage the fiber optic line first end, and a microlens to transceive light with the cable interface. The first plug is shaped to engage a first jack housing. A second plug includes a one-piece mechanical body with a cable interface to engage the fiber optic line second end, and a microlens to transceive light with the cable interface. The second plug is shaped to engage a second jack housing. The mechanical bodies have inner walls that form an air gap cavity interposed between the microlens convex surface and an engaging jack optical interface.

Abstract: A fiber optical connector microlens is provided with a self-aligning optical fiber cavity. The microlens includes a convex first lens surface and a second lens surface. A fiber alignment cavity is integrally formed with the second lens surface to accept an optical fiber core. A lens body is interposed between the first and second lens surfaces, having a cross-sectional area with a lens center axis, and the fiber alignment cavity is aligned with the lens center axis. In a first aspect, the fiber alignment cavity penetrates the lens second surface. In a second aspect, an integrally formed cradle with a cradle surface extends from the lens second surface, and a channel is formed in the cradle surface, with a center axis aligned with the lens center axis. The fiber alignment cavity includes a bridge covering a portion of the channel.

Abstract: A fiber optical connector microlens is provided with a self-aligning optical fiber cavity. The microlens includes a convex first lens surface and a second lens surface. A fiber alignment cavity is integrally formed with the second lens surface to accept an optical fiber core. A lens body is interposed between the first and second lens surfaces, having a cross-sectional area with a lens center axis, and the fiber alignment cavity is aligned with the lens center axis. In a first aspect, the fiber alignment cavity penetrates the lens second surface. In a second aspect, an integrally formed cradle with a cradle surface extends from the lens second surface, and a channel is formed in the cradle surface, with a center axis aligned with the lens center axis. The fiber alignment cavity includes a bridge covering a portion of the channel.

Abstract: A fiber optical connector microlens is provided with a focal plane aligning fiber trap. The microlens is made from a convex first lens surface, a second lens surface (planar or convex), and a fiber trap integrally formed with the second lens surface for aligning a face of an optical fiber core in a microlens focal plane. In one aspect, the fiber trap includes a barrel attached to the second lens surface and a clamping mechanism to prevent an inserted fiber core, with a diameter about equal to a barrel interior surface diameter, from being withdrawn from the barrel. The fiber trap clamping mechanism can be an irregular barrel interior surface to frictionally engage a fiber core exterior surface, a constricted region of the barrel interior surface, having a diameter smaller than an uncompressed fiber core diameter, or a corkscrew region of the barrel interior surface.

Abstract: Fiber optic cable jacks and plugs are provided. In one aspect, a cable is made from at least one length of fiber optic line having a first end and a second end. A first plug includes a one-piece mechanical body with a cable interface to engage the fiber optic line first end, and a microlens to transceive light with the cable interface. The first plug is shaped to engage a first jack housing. A second plug includes a one-piece mechanical body with a cable interface to engage the fiber optic line second end, and a microlens to transceive light with the cable interface. The second plug is shaped to engage a second jack housing. The mechanical bodies have inner walls that form an air gap cavity interposed between the microlens convex surface and an engaging jack optical interface.

Abstract: A fiber optic cable is provided with a cable section including at least one length of fiber optic line having a first end and a second end. A first and second plug each have a mechanical body shaped to selectively engage and disengage a jack housing. Each plug has a microlens with a planar surface to engage the fiber optic line end and a convex surface to transceive light in a first collimated beam with a jack optical interface. The fiber optic cable ends are formed in a focal plane of a corresponding plug microlens.