Abstract: An optical fiber ribbon capable of being divided into two or more robust sub-units along predetermined dividing lines has a plurality of optical fibers in a substantially flat array which have a first, low, matrix-to-fiber coating, which may be a coloring ink, adhesion for facilitating mid-array or mid-span fibers access. The two fibers on either side of each of the dividing lines and adjacent thereto and to each other, have an enhanced or high matrix-to-fiber coating adhesion whereby the sub-units created by the division are sufficiently robust to retain the fibers within the matrix.

Abstract: A time-frequency method and apparatus are disclosed for simulating the initial transient response of quartz oscillators. An original system of differential algebraic equations that characterize a quartz oscillator are reformulated using a system of well-defined partial differential equations (PDEs). The quartz oscillator is initially represented by a system of ordinary differential algebraic equations that are then reformulated using an artificial system of partial differential algebraic equations. The artificial system represents the behavior of the quartz oscillator with two artificial time axes, t1 and t2, at least one of which has periodic boundary conditions. The artificial system is solved numerically using an integration technique along a strip of the artificial system, defined by [0, T(t2)[×[0, ∞[. Thereafter, the time behavior of the signal is calculated from the numerical solution of the artificial system.

Abstract: A cabling media which is suitable for high performance data transmission includes a plurality of metallic conductors-pairs, each pair including two plastic insulated metallic conductors which are twisted together. The present invention describes how the selection and incorporation of metallic conductors having different diameters within a single communication cable can significantly enhance the operational performance of the cable. More specifically, given a first conductor-pair having a certain conductor diameter and twist length, and at least one other conductor-pair with a different twist length, the present invention purposely selects metallic conductors for this other conductor-pair with a different diameter than that of the first conductor-pair so as to ensure that the insertion loss exhibited by the additional conductor-pair is essentially equal to the insertion loss exhibited by the first conductor-pair.

Abstract: A waveguide grating router having an improved passband flatness with lower loss is provided that includes a first optical coupling device having at least one input port, at least one mode converter, and P output ports, where P>2. A second optical coupling device is also provided that has P input ports, least one output port, and at least one mode converter. P optical paths couple the input port of the first optical coupling device to the output port of the second optical coupling device. The mode converters control the magnitudes of various transmission coefficients contributed by the optical paths of the router. The phases of the various contributions are determined by the optical path lengths, and these lengths are chosen so that certain contributions are opposite to other contributions.

Abstract: This invention deals with a method of assembling first and second connectors at the ends of a cable including twisted pairs of color encoded wires, first ends of two wires of one of the twisted wire pairs are connected, preferably at random, to a dedicated pair of tip and ring contacts of the first connector. The second ends of the two wires of the one wire pair are connected, at random, to two intermediate contacts of the second connector. Each intermediate contact is connected by a pair of conductive paths to both of the tip and ring contacts of the second connector dedicated to the one wire pair.

Abstract: The invention includes a process for the production of semiconductor devices comprising the steps of depositing a metal layer on a semiconductor substrate, depositing a hardmask layer on said metal layer, depositing a photoresist on said hardmask layer, patterning said photoresist, thereby exposing and patterning portions of said hardmask layer, etching said exposed portions of said hardmask layer with a hardmask etchant, thereby exposing and patterning portions of said metal layer, removing, or not, said photoresist, and etching said exposed portions of said metal layer with a metal etchant and semiconductor devices made by said process.

Abstract: De-interleaving of forward-link paging or traffic channels is performed by implementing closed-form expressions that are equivalent to the table-based processing specified in the cdmaOne telecommunication specification. The implementation can be in either hardware or software or a combination of both. For each cdmaOne forward-link paging or traffic channel, the closed-form expression relates each interleaved symbol position to a corresponding de-interleaved symbol position, which is used to generate a de-interleaved symbol stream from the interleaved symbol stream. In one hardware implementation, the forward-link de-interleaver of the present invention has an address generation unit made from two modulo counters.

Abstract: A boost converter, a method of converting power and a power supply incorporating the boost converter or the method.

Abstract: A clock switch controller has a clock status register which stores current clock data which identifies which of two or more clock signal sources is a current clock signal source currently in use as a system clock signal source. State machine logic of the controller automatically switches, in response to a clock switch signal, the system clock signal source from the current clock signal source to a new clock signal source of the two or more clock signal sources.

Abstract: Apparatus and method are provided for detecting vehicles which are moving through a predetermined zone. The apparatus includes a plurality of acousto-electric transducers trained on the zone. A bandpass filter is provided for processing electrical signals from the plurality of acousto-electric transducers. A correlator having at least two inputs and an output is provided for correlating filtered versions of the electrical signals originating from at least two of the plurality of acousto-electric transducers. An integrator is provided for integrating the output of the correlator means over time. Finally, a comparator is provided for indicating detection of a vehicle when the integrated output exceeds a predetermined threshold.

Abstract: Problems of fading in a multi-path environment are ameliorated, and the presence of reflective surfaces is turned from a disadvantage to an advantage, by employing a third polarization direction that effectively creates a third communication channel. This third communication channel can be used to send more information, or to send information with enhanced spatial diversity to thereby improve the overall communication performance. A transmitted signal with three polarization directions is created with a transmitter having, illustratively, three dipole antennas that are spatially orthogonal to each other. To take advantage of the signal with the third polarization direction, the receiver also comprises three mutually orthogonal antenna dipoles.

Abstract: A system and method for authenticating fingerprints includes a remote site having a scanner for generating fingerprint data and an access mechanism. A local site connects to the remote site via transmission cables and includes a processor for extracting minutia from the fingerprint data. A comparator matches the fingerprint data to historical fingerprint data maintained in a database to verify whether the detected fingerprint data falls within statistical maximum deviations and exceeds statistical minimum deviations to establish the authenticity of the fingerprint.

Abstract: A method and associated circuitry are disclosed for applying the high column segment voltages needed to erase and program (write) a segmented column flash EEPROM memory. Low voltage CMOS transistors are used for both the read column precharge path and the write/erase data transfer path. Also, the column segment select switch can be constructed of a single, low voltage, n-channel, transistor, rather than two complementary high voltage transistors. All of the above reduces precharge and discharge time, increasing the read speed of the memory. This also eliminates the lengthening of precharge time that occurs as the characteristics of high voltage transistors degrade with age. The present invention provides the additional advantage of eliminating the need to use less reliable high voltage transistors in certain off-pitch circuits needed for write and erase functions, thus increasing overall chip reliability.

Abstract: A current mirror comprises reference and output devices (21, 22), and an amplifier (23) for sensing the drain voltages of said devices (21, 22) and applying a control signal to their gates via a normally-closed switch (33). The output current of a circuit (not shown) feeding the reference device (21) may change if the voltage across it becomes too small. The amplifier (23) attempts to force almost identical voltages on the output electrodes of the reference and output devices. If the output voltage (at OUT) of the current mirror approaches an extreme of the output voltage range, the current feeding the reference device may change, and the output current will be incorrect. Also, if at start up the output voltage approaches this extreme, the circuit may “lock up”.

Abstract: A splice holder for securing and retaining fiber optic splices. The splice holder accommodates a higher density of splices than prior art splice holders, improves access to individual splices and minimizes interference to adjacent splices during removal. The splice holder comprises a plurality of parallel, spaced apart longitudinal members extending from a base. Adjacent pair of members define a channel for retaining a splice. Each channel is tilted having its longitudinal axis at an acute angle relative to the plane of the base such that a splice placed along a channel has one raised end further away from the bottom mounting surface of the base than the opposite end closer to the bottom mounting surface. The plurality of channels are alternatively tilted such that the channels are staggered at the front and rear edges of the base to facilitate access to the raised end of a splice without interfering with adjacent splices closer to the bottom mounting surface of the base.

Abstract: The specification relates to a method and an apparatus for generating cyclical redundancy code (CRC) by analyzing segmented groups of bits from a message concurrently, producing a temporary remainder value as a result of a multiple bit lookup from a generating CRC lookup table, using the temporary remainder or a portion thereof along with the next sequential segmented group of message bits as exclusive-or inputs, taking the result of the exclusive-or output and applying the result as a lookup value from the generating CRC lookup table. The process is repeated until the message groups have been depleted, at which time the message is completely coded and the temporary remainder existing at the time represents the CRC checkbits for the message. The recursive method developed in association with the present invention is called a Recursive Syndrome Expansion (RSE).

Abstract: A method is described for the preparation of a DFB/DBR laser which includes an electro-optic grating formed by periodically modulating the index of refraction of the cladding employed. The method involves depositing a waveguide upon a semi-insulating or doped substrate and then depositing an active layer upon the resultant structure. The active layer is subsequently selectively etched and a cladding material deposited adjacent thereto and electrically isolated therefrom. The cladding is then selectively patterned with a conductive material by photolithographic techniques to yield a grating to periodically modulate the index of refraction.

Abstract: A transceiver is disclosed for use in a wireless handset. The transceiver includes a switch for connecting an antenna, one at a time, to a receiver or to a transmitter. In a reception sub-frame, a limiting circuit switches the switch to an attenuated mode when an output signal of the receiver exceeds a predetermined value. The transceiver further includes a disabling circuit which disables the limiting circuit in response to a disabling signal provided to the disabling circuit when the transceiver is in a traffic mode. In addition, a disabling switch is provided which is activated in the traffic mode to provide the disabling signal. The disabling switch includes a light emitting diode, or is included in a controller of the transceiver. The disabling circuit may include a resistive network, an AND gate, a multi-vibrator, or a timer for disabling the limiting circuit in response to the disabling signal.

Abstract: The invention provides for assessing location and/or proximity to a buried or submerged optical fiber cable. A seismic generator creates seismic pulses, at known frequencies, on the ground (or water) at a first location and the synchronous rotation of the polarization state of light transmitted through the optical fiber cable is detected. Other seismic pulses are generated at different locations and the polarization rotation is detected at each such location to locate a closest proximity to the cable, corresponding to a minimum or maximum of polarization rotation. A wireless synchronous signal is generated with the seismic pulses to differentially isolate the polarization rotation signal; and, if desired, to further determine distance between the cable and the source of the seismic pulse.

Abstract: An electronics cabinet assembly having a support shelf and an equipment module movably supported thereon. The equipment module is moveable between a closed position adjacent the rear of the support shelf, and an extended position substantially forward relative of the support shelf where the equipment module is hingably supported on the support shelf such that the front of the equipment module can tilt downwards to expose the rear of the equipment module for easy access to the wire and cable connectors.