Abstract: Provided herein is a system and method for alleviating gridlock in a pneumatic tube system. In various instances where inter-zone transactions conflict, one of the transactions is removed from a conflicting set and temporarily delivered to an alternate location in the system. This allows other blocked transactions to proceed. Once the gridlock condition is alleviated, the temporarily delivered carrier is retrieved and rerouted to its intended destination.

Abstract: Provided herein is a system and method for providing inter-zone connections between first and second portions of a pneumatic tube system. The systems and methods (i.e., utilities) permit creating a direct pneumatic path between the first zone and the second zone. In this regard, air pressure or vacuum from a first zone may be utilized to effectuate transfer of a carrier through a portion or all of the second zone and/or to provide operating pressure or vacuum to the second zone.

Abstract: Provided herein is a system and method for alleviating gridlock in a pneumatic tube system. In various instances where inter-zone transactions conflict, one of the transactions is removed from a conflicting set and temporarily delivered to an alternate location in the system. This allows other blocked transactions to proceed. Once the gridlock condition is alleviated, the temporarily delivered carrier is retrieved and rerouted to its intended destination.

Abstract: Provided herein is a system and method for providing inter-zone connections between first and second portions of a pneumatic tube system. The systems and methods (i.e., utilities) permit creating a direct pneumatic path between the first zone and the second zone. In this regard, air pressure or vacuum from a first zone may be utilized to effectuate transfer of a carrier through a portion or all of the second zone and/or to provide operating pressure or vacuum to the second zone.

Abstract: A multi-band (multi-color) multiwavelength mode locked laser diode is provided by dynamic phase compensation of a quantum dot active medium. The laser diode is provided with a PIN diode structure where the active medium consists of a plurality of layers of quantum dots such as those produced by self-assembly from known chemical beam epitaxy methods. The multiplicity of bands may be produced by AC Stark splitting, frequency selective attenuation, or by the inclusion of multiple different layers having different, respective, peak ASE emissions. Dispersion compensation within laser facets, waveguides, and the optically active media permit the selection of a fixed dispersion within the cavity. A dynamic group phase change induced by the AC Stark effect permits compensation of the fixed dispersion sufficiently to produce an intraband mode-locked laser. Even interband mode locking was observed.

Abstract: Methods and devices for providing a multiwavelength laser which may be used for multicasting and other optical communications uses. The present invention provides a quantum dot based multiwavelength laser with a monolithic gain block. The Fabry-Perot gain block has both upper and lower InP cladding layers. The laser system has a middle quantum dot layer with multiple stacked layers of InAs quantum dots embedded in InGaAsP. When provided with a CW injection current, the laser system produces an output spectra with equally spaced multiple emission peaks. With an input optical data signal applied to the laser system, the laser system duplicates the data in the input signal across multiple different wavelengths.

Abstract: A multi-band (multi-colour) multiwavelength mode locked laser diode is provided by dynamic phase compensation of a quantum dot active medium. The laser diode is provided with a PIN diode structure where the active medium consists of a plurality of layers of quantum dots such as those produced by self-assembly from known chemical beam epitaxy methods. The multiplicity of bands may be produced by AC Stark splitting, frequency selective attenuation, or by the inclusion of multiple different layers having different, respective, peak ASE emissions. Dispersion compensation within laser facets, waveguides, and the optically active media permit the selection of a fixed dispersion within the cavity. A dynamic group phase change induced by the AC Stark effect permits compensation of the fixed dispersion sufficiently to produce an intraband mode-locked laser. Even interband mode locking was observed.

Abstract: Methods and devices for providing a multiwavelength laser which may be used for multicasting and other optical communications uses. The present invention provides a quantum dot based multiwavelength laser with a monolithic gain block. The Fabry-Perot gain block has both upper and lower InP cladding layers. The laser system has a middle quantum dot layer with multiple stacked layers of InAs quantum dots embedded in InGaAsP. When provided with a CW injection current, the laser system produces an output spectra with equally spaced multiple emission peaks. With an input optical data signal applied to the laser system, the laser system duplicates the data in the input signal across multiple different wavelengths.