摘要:
The present invention provides a device and method for achieving protection in a free-space micromachined optical switching fabric. The present invention provides two protection schemes for mirror failures, which utilize either existing switching mirrors or additional integrated mirrors without extra fabrication effort or performance-degradation of the switch fabric. A switch fabric includes a plurality of micromachined free-rotating mirrors arranged in a rectilinear matrix configuration. The mirrors are reflective on both front and back sides. According to one embodiment of the present invention, upon the detection of a failed mirror associated with a transmission between an input and an output, a transmission path is determined that includes a backside of a pivot mirror. A transmission path is then established between the input and the output that utilizes the backside of the pivot mirror.
摘要:
The present invention provides a device for performing wavelength add/drop multiplexing utilizing micromachined free-rotating switch mirrors. The free-space nature of the switch mirrors allow use of the front and back sides of the mirrors for reflecting signals. According to one embodiment of the present invention a WADM is provided in which micromachined switch mirrors are arranged in a polygonal (e.g., hexagonal) geometry, which allows full connectivity. According to one embodiment a WADM is provided for deployment in a unidirectional two-fiber optical network including service and protection fiber routes. According to this embodiment the WADM includes a first input port for receiving a WDM signal from the service fiber route and a second input port for receiving a WDM signal from the protection fiber route. The WADM also includes a first output port for transmitting a WDM signal to the service fiber route, a second output port for transmitting a WDM signal to the protection fiber route, a third input port for receiving locals signals from a local access port and a third output port for dropping signals to a local access port. The WADM further includes a reconfigurable switching matrix comprising a plurality of free-space micromirrors, for performing routing of signals from the various input ports to the various output ports. According to an alternative embodiment a WADM is provided for deployment in a bidirectional two-fiber optical network including two service/protection routes.
摘要:
Photoconductive optoelectronic devices, such as photodetectors and photovoltaics, are provided. The devices are sensitized to a particular wavelength (or range of wavelengths) of electromagnetic radiation such that the devices provide increased performance efficiency (e.g., external quantum efficiency) at the wavelength. The devices include a photoconductive semiconductor layer spanning an electrode gap between two electrodes to provide a photoconductive electrical conduit. Abutting the semiconductor layer is a plurality of plasmonic nanoparticles. The improved efficiency of the devices results from wavelength-dependent plasmonic enhancement of device photosensitivity by the plasmonic nanoparticles.
摘要:
An integrated device includes a micro-lens and an opto-electronic device can be formed on a single substrate. The opto-electronic device may be one or more photodetectors and the micro-lens may be shaped to allow partial absorption of light incident to the micro-lens by the photodetectors. The integrated device is capable of simultaneously performing position detection, signal monitoring, and focusing/collimation.
摘要:
Photoconductive optoelectronic devices, such as photodetectors and photovoltaics, are provided. The devices are sensitized to a particular wavelength (or range of wavelengths) of electromagnetic radiation such that the devices provide increased performance efficiency (e.g., external quantum efficiency) at the wavelength. The devices include a photoconductive semiconductor layer spanning an electrode gap between two electrodes to provide a photoconductive electrical conduit. Abutting the semiconductor layer is a plurality of plasmonic nanoparticles. The improved efficiency of the devices results from wavelength-dependent plasmonic enhancement of device photosensitivity by the plasmonic nanoparticles.
摘要:
An optical switch having a fiber/lens array and a switching substrate may be properly aligned using one or more grating(s) provided on the switching substrate. The grating(s) may be designed to have a predetermined response when the fiber/lens array and switching substrate are properly aligned. For example, the grating(s) may reflect incident light back into an input fiber, where the back-reflected light may be detected. Accordingly, the position of the switching substrate and/or fiber/lens array may be adjusted until back reflected light having predetermined power is detected.
摘要:
The present invention relates to an assembly of multiple waveguides which includes a substrate and a plurality of waveguides positioned on said substrate at locations effective to suppress cross-talk between different waveguides. The plurality of waveguides each comprise an elongate array of quantum dots extending between sets of first and second locations on the substrate. The waveguides are positioned to receive: (1) pumped light uniformly applied to the array to produce electron-hole pairs and to enable optical gain and (2) signal light at the first location to trigger an emission from the quantum dot at the first location and transmission of photons along the array to the second location. A light transmission system which includes this assembly as well as methods of making and using the assembly are also disclosed.
摘要:
An optical device includes a compact and low cost integration of a movable micro-mirror and control mechanisms. The optical devices may be manufactured using microelectromechanical system (MEMS) technology. The optical device may be used in a high port count optical switch, such as an optical cross connect for use in an optical telecommunication system, that uses beam steering to couple light from input fibers to selected output fibers.