Abstract: A method for multi-service provisioning in an OFDMA-PON that includes linking communicatively to a core network and bandwidth provisioning, dynamically within a single wavelength, traffic from the core network to a network of multiple virtual passive optical networks VPONs for multi-service provisioning to the VPONs.

Abstract: Systems and methods are disclosed for providing media access control (MAC) in an optical network by providing a separate control channel and data channel; dedicating each optical network unit (ONU) with one control channel, wherein the control message is transmitted at any time without constraints; sending a grant message to an ONU just before an allocated time is about to start; and sending data traffic from the ONU immediately after receiving the grant message without synchronizing with an optical line terminal (OLT) clock.

Abstract: Systems and methods for process aware metrology are provided. One method includes selecting nominal values and one or more different values of process parameters for one or more process steps used to form the structure on the wafer, simulating one or more characteristics of the structure that would be formed on the wafer using the nominal values, and determining parameterization of the optical model based on how the one or more characteristics of the structure vary between at least two of the nominal values and the one or more different values.

Abstract: Technologies are generally described for network traffic scheduling in a wavelength division multiplexing (WDM) passive optical network (PON). Dynamic wavelength assignment and time allocation in hybrid WDM/TDM PONs with tunable lasers as optical light generators is accomplished by mapping the scheduling into a multi-processor scheduling problem with wavelength channels as machines and ONU requests as jobs. Wavelengths may be considered as parallel identical machines. Taking laser tuning time into consideration preemptive and non-preemptive scheduling with the objective of minimizing the latest job completion time is computed employing a number of heuristic algorithms. The algorithms compute two extreme cases of zero and infinity laser tuning time, respectively. Using the results from these two extreme cases, the heuristic scheduling schemes for the case of arbitrary laser tuning time yield close average latest job completion times for both schedule types.

Abstract: Systems and methods for process aware metrology are provided.

Abstract: Systems and methods for process aware metrology are provided.

Abstract: A method for multi-service provisioning in an OFDMA-PON that includes linking communicatively to a core network and bandwidth provisioning, dynamically within a single wavelength, traffic from the core network to a network of multiple virtual passive optical networks VPONs for multi-service provisioning to the VPONs.

Abstract: Technologies are generally described for substantially maximizing capacity in a wavelength division multiplexing (WDM) passive optical network (PON). An “achievable rate region” may be defined as a set containing admissible traffic rates of a given WDM PON system such that a volume of an achievable rate region is proportional to a capacity of the network. Deriving the achievable rate region for a particular network, decisions may be made whether incoming traffic rate can or cannot be achieved for that network. Moreover, the achievable rate region may be used to construct a WDM PON utilizing a minimum number of wavelengths, a minimum number of lasers with narrowest tuning ranges, and a minimum number of receivers, thereby reducing a capital expenditure in building the PON system.

Abstract: A method for reducing energy consumption of a passive optical network includes optical network units of the network which infer their downstream queue status rather than being explicitly notified by an optical line terminal of the network. Based on the inferred queue status, the optical network units make their own sleep mode decisions without assistance from optical line terminal. Both downstream traffic inference and sleep decision making at the optical network units are based on common information possessed by optical line terminal and optical network units. Accordingly, the optical line terminal can accurately infer the status of each optical network unit if the sleep control scheme implemented at an optical network unit is known by the optical line terminal.

Abstract: Systems and methods are disclosed for providing media access control (MAC) in an optical network by providing a separate control channel and data channel; dedicating each optical network unit (ONU) with one control channel, wherein the control message is transmitted at any time without constraints; sending a grant message to an ONU just before an allocated time is about to start; and sending data traffic from the ONU immediately after receiving the grant message without synchronizing with an optical line terminal (OLT) clock.

Abstract: A differential frame-based scheduling scheme is employed for input queued (IQ) switches with virtual output queues (VOQ). Differential scheduling adjusts previous scheduling based on a traffic difference in two consecutive frames. To guarantee quality of service (QoS) with low complexity, the adjustment first reserves some slots for each port pair in each frame, then releases surplus allocations and supplements deficit allocations according to a dichotomy order, designed for high throughput, low jitter, fairness, and low computational complexity.

Abstract: Techniques for partitioning and/or combining at least a portion of an optical network tree including one or more array waveguide gratings (“AWGs”) and fibers in wavelength division multiplexing (“WDM”) passive optical networks (“PON”) with cascaded AWGs are disclosed. Example methods include deriving the optimal positions for the AWGs to minimize fiber cost and then determining the arrangement of cascaded AWGs to minimize the total cost of AWGs and fibers. Determining the arrangement of cascaded AWGs may include recursive partitioning followed by recursive combination. An example recursive partition-combination based algorithm for optimizing a tradeoff between the AWG cost and the fiber cost is disclosed.

Abstract: Technologies are generally described for network traffic scheduling in a wavelength division multiplexing (WDM) passive optical network (PON). Dynamic wavelength assignment and time allocation in hybrid WDM/TDM PONs with tunable lasers as optical light generators is accomplished by mapping the scheduling into a multi-processor scheduling problem with wavelength channels as machines and ONU requests as jobs. Wavelengths may be considered as parallel identical machines. Taking laser tuning time into consideration preemptive and non-preemptive scheduling with the objective of minimizing the latest job completion time is computed employing a number of heuristic algorithms. The algorithms compute two extreme cases of zero and infinity laser tuning time, respectively. Using the results from these two extreme cases, the heuristic scheduling schemes for the case of arbitrary laser tuning time yield close average latest job completion times for both schedule types.

Abstract: Technologies are generally described for substantially maximizing capacity in a wavelength division multiplexing (WDM) passive optical network (PON). An “achievable rate region” may be defined as a set containing admissible traffic rates of a given WDM PON system such that a volume of an achievable rate region is proportional to a capacity of the network. Deriving the achievable rate region for a particular network, decisions may be made whether incoming traffic rate can or cannot be achieved for that network. Moreover, the achievable rate region may be used to construct a WDM PON utilizing a minimum number of wavelengths, a minimum number of lasers with narrowest tuning ranges, and a minimum number of receivers, thereby reducing a capital expenditure in building the PON system.

Abstract: Techniques for partitioning and/or combining at least a portion of an optical network tree including one or more array waveguide gratings (“AWGs”) and fibers in wavelength division multiplexing (“WDM”) passive optical networks (“PON”) with cascaded AWGs are disclosed. Example methods include deriving the optimal positions for the AWGs to minimize fiber cost and then determining the arrangement of cascaded AWGs to minimize the total cost of AWGs and fibers. Determining the arrangement of cascaded AWGs may include recursive partitioning followed by recursive combination. An example recursive partition-combination based algorithm for optimizing a tradeoff between the AWG cost and the fiber cost is disclosed.

Abstract: A system and method for detecting a defect in an actuator arm conductor coil is disclosed. An actuator arm including a conductor coil is received. The conductor coil is coupled with a voltage as an anode. The conductor coil is submerged into a first solution, the first solution having no organic matter therein. The first solution is then coupled with a second solution including an organic indicator. The second solution also includes a cathode coupled to the voltage such that a defect in an insulation layer of the conductor coil is indicated by the organic indicator.

Abstract: Embodiments of the present invention include a method for quantitatively detecting embedded particles of a disk spacer ring comprising. The method includes dissolving a layer of a disk spacer ring into a liquid solution, the disk spacer ring layer comprising embedded particles. The method further includes filtering the solution to capture the embedded particles. The method further includes counting the particles.

Abstract: Embodiments of the present invention include a method for quantitatively detecting embedded particles of a disk spacer ring comprising. The method includes dissolving a layer of a disk spacer ring into a liquid solution, the disk spacer ring layer comprising embedded particles. The method further includes filtering the solution to capture the embedded particles. The method further includes counting the particles.