Abstract: A system for delivering packetized data in a network dynamically assigns a unique address to a mobile unit, allocates bandwidth within a wireless link by a token scheme and provides forward error correction for the packet. The system wirelessly transports the packets between a base station and an end point which is responsive to a link cell for linking the base station and the end point. The link cell contains a header and a body. The header in turn contains a forward error correction code, a radioport id and a token. The forward error correction code provides error detection and error correction that relies solely on a one-way communication of data bits from a sender to a receiver. The radioport id is a logical id assigned such that each radio-port in a vicinity has a unique id. The token enables the wireless transportation over a selected channel of the packets between the base station and the end point. The token is utilized to allocate the selected channel from a plurality of channels.

Abstract: VLSI and ULSI devices like microprocessors and DRAM devices are prone to large scale theft from factories and warehouses. A proposed method of reducing the theft incorporates a small amount of non-volatile flash memory in these devices. The flash memory contains password, device serial number and user identification information. On power-up, the device initiates an encrypted password verification session through a standard interface. If the user supplied password fails, the device's operational ports (any data or control output buses) are tri-stated, thus making the device unusable. The device serial number and user identification information are useful in determining ownership of stolen devices when recovered.

Abstract: The invention is a low distortion differential amplifier circuit with the following characteristics: there are outputs OUT1, OUT2, inputs IN1, IN2; a ground GND that is connected to each of the current sources 14, 16; each transistor 10, 12 is connected in series to each of the above outputs OUT1, OUT2 and to each of the current sources 14, 16; each of the above transistors' 10, 12 base (or gate) is connected to the output of an operational amplifier 18, 20; each of the above transistors' 10, 12 emitter (or source) is connected by the resistor 22; the positive input of each of the above operational amplifiers 18, 20 is connected to one of the above inputs IN1, IN2; the terminal of each of the above transistors 10, 12 that is connected to the resistor is also connected to a voltage source 30, 32 which is then connected to the negative input of the above operational amplifier 18, 20. Transistors with special bases (or gates) are used in the input stage of the operational amplifiers mentioned above.

Abstract: The specification describes techniques for cleaving crystal bodies, e.g. semiconductor laser bars, using thermostatic cleaving tools. Use of such tools allows the cleaving process to occur in an ultra high vacuum chamber without the use of mechanical devices activated from the exterior of the chamber. Cleaving occurs automatically and controllably by locally heating the cleaving tools, thereby deflecting the thermostatic element against the laser bar and causing fracture.

Abstract: In accordance with the invention a multiwavelength optical fiber transmission system is provided with a passive all-fiber optical router for add/drop multiplexing. The passive router is comprised of three fiber components: 1) a fiber directional coupler, 2) a fiber reflective grating filter and 3) a fiber notch filter. The specification describes optical routers from these components ranging in complexity from a three wavelength router to an N-wavelength router.

Abstract: A molded encapsulated electronic component containing a silicon device, chip, or integrated circuit characterized by ease of fabrication and minimum possibility of breakage or dislocation, included a lead frame bearing a compressed, thin elastomeric, anisotropic, electrically conductive compliant interconnect on which the silicon integrated circuit is positioned--all mounted within an all-enveloping plastic.

Abstract: A ribbon array switch in which an input ribbon array comprising a plurality of input optical fibers can be selectively switched to any one of a plurality of output ribbon arrays mounted on an outer periphery of a switch housing. Preferably, the input ribbon is rotated, whereby the input optical fibers will be optically connected to corresponding output optical fibers that make up the output ribbon arrays. Furthermore, the invention features an optical switch architecture including a first stage comprising a fiber switch element and second stage comprising a ribbon array switch element described above. The output optical fibers of the fiber switch element make up the input ribbon array of the ribbon array switch element.

Abstract: Apparatus performs polarization dependent functions although the apparatus is polarization independent with respect to the outside world. The apparatus produces parallel beams with like polarization, and the parallel beams are then subject to polarization dependent processing.

Abstract: A method for delivering enhanced caller identification (ID) service including geographic location information comprises initializing an originating switch with geographic identification data (GID). The GID is stored in each switch module memory, and is accessed by the originating switch each time a calling party initiates a call to a called party. If the called party subscribes to caller ID service, the calling's party directory number, and the GID associated with the switch is delivered to the called party as part of caller ID service so that the true geographic location of the caller can be ascertained.

Abstract: A phase detector for a phase-locked loop ("PLL") circuit under control of a local oscillating clock ("LOSC") signal and a method of operation thereof.

Abstract: For use with a telecommunications network, circuit for, and method of, detecting telephone line status and a telephone instrument embodying the same. The circuit includes: (1) a high-impedance amplifier, couplable to the telecommunications network, for providing DC voltage representing a differential line voltage between tip and ring conductors of the telecommunications network and (2) a pulse-generation circuit, coupled to an output of the amplifier, for generating a signal having first and second states, the signal assuming the second state for a period of time inversely proportional to the differential line voltage between the tip and ring conductors.

Abstract: Sub-micron PMOSFETs including n.sup.+ polysilicon gates and buried channels having impurity concentrations comprising indium or gallium are provided. The buried channel PMOSFETs have improved short channel characteristics and are particularly suitable for use in CMOS technologies.

Abstract: Apparatus and methods for a combined optical modulator/photodetector are disclosed. A modulator chip is attached to a photodetector chip using a non-conductive epoxy or solder. The combined modulator/photodetector can be configured in at least two ways. In one configuration, the modulator is located on the upper surface of a chip that is attached, at its lower surface, to a photodetector containing chip. In another configuration, the modulator is located on the lower surface of the modulator chip, which is again attached at its lower surface to the pbotodetector chip. By combining the modulator and photodetector in the manner described above, they can be placed in a single package, resulting in reduced packaging costs versus a separately packaged modulator and a separately packaged photodetector. Moreover, feedback from the photodetector can used to optimize the operation of micromechanical optical modulators.

Abstract: A facility is disposed in a telecommunications network to provide an alternative to the conventional call waiting feature. More particularly, if a telephone call is placed to a subscriber while the subscriber's telephone station set is busy with another telephone call, then the facility notes that fact and terminates the new telephone call after advising the caller that the subscriber's station is busy. Thereafter, the facility places a telephone call to the subscriber and presents thereto at least the telephone numbers of the telephone stations that placed respective calls to the subscriber during the time that the latter's station was busy.

Abstract: A programmable timer circuit having ON and OFF volume control states; for controlling the volume of audible signals generated by a signal generator of a communication device at preprogrammed times is disclosed. The programmable timer circuit monitors a communication link for the presence of signals indicative of an incoming communication. When such signals are detected and the volume control state of the timer circuit is ON, the volume of the audible signals generated by the signal generator of the communication device is adjusted so that such audible signals are broadcast with a programmed loudness. Volume control of the audible signals generated by the signal generator does not prevent outgoing communications using the communication device. The fact that the volume of the audible signals generated by the signal generator is controlled, is not apparent to the calling party.

Abstract: An automatic inspection method contactlessly measures the offset of a feature of an object from a theoretical ideal center of the object, and is particularly suited for measuring at an endface of an optical fiber termination the eccentricity of an optical fiber core relative to a theoretical ideal center of the termination. The core is extremely smaller (typically between about 50 and 500 times) in size than the termination boundary. An inspection system for implementing the novel inspection method has a feature imager, one or more boundary segment imagers but preferably four in number, and a machine vision system connected to the foregoing imagers. The feature imager is positioned to capture an image of the feature (e.g., fiber core endface), and the one or more boundary segment imagers are positioned to capture an image of a corresponding boundary segment of the object (e.g., termination endface).

Abstract: The general problem of conveying a particular meaning in a message so that the meaning is most understandable when an abridged version of the message is displayed is solved by supplying as the message a "tagged" string in which all characters in the unabridged version of the sting are tagged with respective priority indicator each having a value indicating a particular priority level. In a station set an abridged version of the string for a particular priority level is determined by selecting all characters from the received, unabridged version having a priority indicator value equal to or greater than that particular priority level. A priority level is elected such that the corresponding abridged string fits within the available display length.

Abstract: A method and composite for doubled-sided processing of plastic substrates that can be used as the plates in a liquid crystal display are disclosed. In one embodiment, the composite comprises an ultraviolet light (UV) blocking layer that is sandwiched between two plastic substrates. A layer of indium-tin-oxide (ITO) is disposed on one side of each of the two plastic substrates. The plastic substrates are arranged so that the ITO layer on each substrate faces outwardly. The resulting composite sandwich structure is laminated and can be rolled-up or sheared into individual sheets for further processing.

Abstract: A four terminal multiplication circuit capable of mixing up to three input signals. The circuit includes a MOS transistor having gate, source, drain and back-gate terminals. When the circuit is used as an RF mixer or downconverter, an RF signal is provided to the gate terminal and a local oscillator signal is provided to the back-gate terminal. A DC voltage is applied to the source terminal for biasing the transistor and the mixed/downconverted output (IF) signal is obtained from the drain terminal. A single balanced and a double balanced mixer circuit are also disclosed. In the single balanced circuit, two MOS transistors are used; the RF signal is applied to the gate terminals with the positive phase LO component applied to one back-gate terminal and the negative phase local oscillator (LO) component applied to the other back-gate terminal for producing a positive phase and a negative phase IF signal.

Abstract: The present invention is a methodology for reducing the rate of decoherence in quantum memory. A procedure is disclosed for storing an arbitrary state of n qubits using expanded groupings of these n qubits in a decoherence-resistant manner. Each qubit of the original n qubits is mapped into a grouping of qubits, and the process will reconstruct the original superposition simultaneously correcting both bit and phase errors if at most one qubit decoheres in each of these groups of qubits. In one preferred embodiment of the present invention, a method is disclosed for decoding a set of N'(2m+1) qubits, wherein the set of N'(2m+1) exposed qubits has undergone possible decoherence from a superposition of states due to exposure to an environment.