Abstract: The scanning free space optical broadband access network uses LASERs to carry high-speed data streams between a central location and a number of subscribers served from that location. High-speed digital data modulates the LASERs in both directions, allowing a virtual MAN to be created. A few dozen subscribers share a single virtual pipe with several hundred Mbps band-width available. Beam scanning techniques at a central hub permit a single LASER and optical assembly to serve many customers.

Abstract: A method for identifying faults in a branched optical network having a central office optically connected to a plurality of optical network units by a plurality of optical paths. The method involves transmitting an optical signal from the central office to the optical network units reflecting a portion of the transmitted optical signal back to the central office. This reflected signal is then used to determine whether a fault exists in the branched optical network.

Abstract: Problems caused by a nonuniform processing profile are avoided by altering the area to be processed so as to compensate for the processing profile. More specifically, with regard to etching, problems caused by a nonuniform etch profile can be avoided by altering the mask employed in specifying the etch area so as to compensate for the etch profile. Nonuniform parameters of interest of structures which result from a nonuniform etch profile during the etching of a mask in which all the structures were identical can be avoided for by altering the mask employed in specifying the etch area so as to compensate for the etch profile. The mask is changed in a manner that is inversely proportional to the etch profile for each particular structure characteristic that determines the parameter of interest for which uniformity is desired.

Abstract: In the modular feed for a phased array antenna, the advantages of a series-type feed and a corporate-type feed are combined to increase the system efficiency and the operating bandwidth of the modular feed. Feed modules having a stage of power bifurcation are used to feed array modules having a general series-type feed configuration. The array modules may be interchangeable, and the feed modules may be interchangeable, which decreases production costs and system complexity.

Abstract: Tools and methods in which user interaction via a common user interface enables the assessing of network security prior to implementation of the network, as well as assessing the security of existing networks, portions of existing networks, or modifications to existing networks.

Abstract: Method and apparatus for fault localization in an optical network using time trend correlation of end node performance parameters and intermediate node performance parameters, such as QoS and quasi-Q factors, respectively. The method and apparatus are bit-rate and protocol independent, enabling testing for each channel of a diverse dense wavelength division multiplexed traffic system using a single set of hardware.

Abstract: A method and apparatus are disclosed that support multiple mobile address types using object-oriented programming techniques. A mobile address object class supports the creation of mobile address objects. The mobile address object class includes the test-and-branch code that supports each mobile address type. A CPA Mobile Address class allows mobile address information to be stored in CPAMA objects in a uniform manner. The CPA Mobile Address class provides the address retrieval functionality to map the stored mobile address information to a suitable format. The CPAMA class provides a set of constructors to create and initialize its data members using an appropriate format, such as an access channel format or an ANSI International Mobile Station Identifier format, and a set of destructors to de-initialize objects before they are destroyed. The address information can be extracted from a CPAMA object using a set of member functions.

Abstract: Method and apparatus are disclosed for an optoelectronic network interface device allowing reconfiguration of ports in a Local Area Network (LAN). More particularly, the optoelectronic interface device is integrated to include optical ports for communicating with a network, electronic circuits for providing an interface to end-users and a controllable electronic switch between the optical ports and electronic circuits. In response to a control signal, the switch dynamically reconfigures the connection between selected optical ports and selected electronic circuits.

Abstract: A wavelength converter with a monolithically integrated delay loop in a delayed interference configuration that needs only one SOA or other non-linear optical element coupled to the input fiber, a first coupler arranged to split the output of the SOA or other non-linear optical amplifying element into two paths having controllable delay and phase shift characteristics, and at least one output coupler to combine the signals present on the two paths to provide the converter output. One embodiment of the invention has a monolithically integrated delay loop utilizing one or more asymmetric couplers. Another embodiment of the invention has a coupler that does not require an asymmetric splitting ratio, and has either a gain element in one of the paths, an attenuation element in one of the paths, or both.

Abstract: Mezzanine boards can be added to and removed from a supporting base board mounted in a slot of a shelf adjacent other base boards while the base boards remain in electrical service. Guide rails allow a mezzanine board to be slid into position from the front edge of the base board. The guide rails themselves can be moved to provide a new spacing to accommodate a different width mezzanine board without having to take the supporting base board out of service. Openings in the sides of the guide rails promote the flow of air between the mezzanine board and the base board to provide cooling.

Abstract: An apparatus and method for performing interference cancellation by dividing a signal for K users, where K>1, into N time segments, where N>1; successively canceling interference for each of the N segments to produce K user symbols, where the cancellation is performed for each of the N segments independent of any other segment; and combining the K user symbols into a stream of successive data bits.

Abstract: A packet switched communications system is provided in which a station communicates with at least one user over downlink communication channel, the downlink communication channel being divided into a plurality of frames and each frame including a plurality of data packets. Each data packet is directed to a predetermined user and includes transmission power control information for said user. An extended transmission power control information field is provided in at least one data packet in every frame, which includes transmission power control information for 10 at least one other user of the communication system.

Abstract: A communication system and method for supporting both POTS and high speed data services between a remote CPE interface, located at a subscriber premises, and a central office. An analog to digital converter transforms an analog POTS signal to a digital POTS signal, and a combiner circuit combines the digital POTS signal with a high speed data signal into a combined digital signal which preferably has a single communication spectrum. A power detector identifies a power failure at the remote CPE interface, and a life line communication path is established from the central office to the remote CPE interface in response to the power failure.

Abstract: The present invention provides a method for limiting the number of simultaneous call forwarding attempts for a mobile unit. A call is made for a mobile unit. The call request is sent to the MSC associated with the mobile unit. When the mobile unit is not currently active at the MSC, the MSC sends a location request to an SCP. The SCP responds with a return message that includes a temporary location directory number (TLDN) and an indicator. The MSC checks the current number of simultaneous call forwarding attempts being made for the mobile unit. If the current number of simultaneous call forwarding attempts exceeds a threshold, the MSC does not forward the call. If the number of simultaneous attempts does not exceed a threshold, the MSC forwards the call to the mobile unit by sending it to the TLDN.

Abstract: An optical fiber having a multi-material coating and a fabrication method therefor are disclosed. The coating includes at least two portions adjacent in a longitudinal direction. Adjacent portions are comprised of different materials having different Young's moduli. The invention provides a multi-material coating for an optical fiber and coating fabrication method wherein the interfacial shearing stress for the multi-material coated fiber is less than the interfacial shearing stress for a substantially like fiber coated with only one of the materials found in the multi-material coating. Further disclosed is a telecommunications system and fabrication method, wherein the system comprises multi-material coated fibers having reduced interfacial shearing stress.

Abstract: The system includes a network having a base controller (30) and a mobile station (32). The base controller (30) has a packet measurement order unit (34) which causes a package measurement reporter (68) in the mobile station to provide a measurement report. This report is stored in a buffer (44) and compared with reference values on a reference unit (48). If a change of cell is warranted, a packet cell change order unit (50) issues a command which is recorded by packet cell change unit (58) of the mobile station to retune the transmitter and receiver (54 and 56) to a new cell. The mobile station also has a unit (64) which generates a package cell change request to the base controller (30) to initiate a package cell change order from the unit (50) when a change is warranted.

Abstract: Noise-like signal components are detected within arbitrary regions of the time-frequency plane. Various transforms are applied to G time domain samples with different spectral/temporal resolutions. The flatness of the time domain samples and the frequency samples for each transform are compared. If the computed flatness measures are about the same, the samples are assumed to be noisy. Noise-like signal components can be detected using a general filterbank within a limited time interval and frequency range by decomposing the signal into N subbands. To each group of G subband samples in time {tk}, a linear orthogonal transform is applied to obtain the frequency domain samples {fi}. The flatness of the time domain samples is compared to the flatness of the frequency domain samples {fi}. A filterbank with uniform frequency-tiling can be used to detect noise-like signal components.

Abstract: A system and method for information searching comprising determination of, in fine granularity, a Community of Interest (COI), further data mining in search results, using at least one of COI and expert preferences to identify important knowledge, formulation and manipulation of results, and summarization of search results into a document like entity with dynamic attributes described. More particularly, the invention relates to a system and method for providing interactive dialogue and iterative search functions to find information on a large network of servers such as the world wide web.

Abstract: Using an imaging system, an optical MEMS devices is imaged so that in combination with an actual one or more other optical MEMS devices, or images thereof, a single virtual optical MEMS device is formed that has the size of each of the optical MEMS devices combined. The physical size of the arrangement may be reduced by compacting the optical path, e.g., using appropriate conventional mirrors, and/or employing folded arrangements, i.e., arrangements in which there is only one MEMS device stage that does double duty for both input and output through the use of at least one conventional mirror. The imaging system may reproduce the angle of reflection of the light from the micro mirror, e.g., using a telecentric system. A prism may be employed to align the various optical MEMS devices, or images thereof.

Abstract: This invention relates to a method to effect hop-by-hop routing in a network segment where different nodes have different views of the network topology. In particular, the methods of this invention are applicable when each node in a network or network segment may be aware of only a subset of the communication links in the network, without perceiving other communication links. Based on each node's individual view of the network, the method introduces the concept of a visibility set that includes all visible communication links. More specifically, an efficient algorithm is disclosed for searching for a family of one-to-all optimal feasible paths in communication network where different nodes may have different views of the network topology.