Abstract: A high speed detection system and method capable of generating audits of investigable patterns from log data using techniques for grouping and filtering the data so as to create vectors of patterns which can be then further analyzed by applying conditional filters to conclude that a threat may be active has been created to solve at least the above discussed problems.

Abstract: An adaptive parser capable of automatically reordering expressions such that more commonly matched expressions are tested earlier than less commonly matched expressions; by reordering the expressions in this manner, less frequently matched expressions are less frequently tested, or may not be tested at all, thereby lowering the overall number of tests and increasing the amount of data that can be parsed in a given time period.

Abstract: An adaptive parser capable of automatically reordering expressions such that more commonly matched expressions are tested earlier than less commonly matched expressions; by reordering the expressions in this manner, less frequently matched expressions are less frequently tested, or may not be tested at all, thereby lowering the overall number of tests and increasing the amount of data that can be parsed in a given time period.

Abstract: A high speed detection system and method capable of generating audits of investigable patterns from log data using techniques for grouping and filtering the data so as to create vectors of patterns which can be then further analyzed by applying conditional filters to conclude that a threat may be active has been created to solve at least the above discussed problems.

Abstract: For communicating over optical routes, route monitoring and protection are provided. In routes carrying signals on each of a number of wave lengths a tapped fraction of the signal is demultiplexed and an individual wave length is detected for determining performance and for triggering switching to alternative monitored routes carrying the same signal. Switching of all wave lengths if one shows faulty, with either a single wave length or all wave lengths being monitored is shown. Performance of a long wave length component is employed to determine route quality for shorter wave lengths as well. In bi-directional communication systems, performance of a wave length moving in one direction through a route determines route quality for transmission in the other direction, as well. Progressive sampling and digitization of the tapped signal and comparison to a digitized reference enables high sensitivity of monitoring.

Abstract: Fiber optic power splitters having a central fiber and a selected number of surrounding fibers spaced periodically around the central fiber and the method of fabricating such splitters are described. For splitters having between three and five surrounding fibers, the central fiber is made to have a reduced diameter relative to the surrounding fibers so that it contacts each of the surrounding fibers and each of the surrounding fibers, likewise, touches each of its neighboring fibers. For splitters having seven or more surrounding fibers, the diameters of the surrounding fibers are reduced relative to the central fiber so that mutual contact is made among the set of equal diameter surrounding fibers and the central fiber. The equation governing the relative diameters of the central and surrounding fibers, and methods of obtaining uniform diameter reduction in an optical fiber are described.

Abstract: An optical fiber unit assembly package consists of a protective body having a lid and defining a volume, an entry for an optical fiber cable penetrating the body, at least one optical fiber cable extending through the entry and defining a conduit for an optical fiber cable. An anchor for an optical fiber cable is disposed within the entry as is a clamp for an optical fiber extending through the conduit within the package in a manner to isolate an internal optical fiber unit assembly within the volume from tensile forces applied externally upon the fiber. Secure mounting for optical fiber units within the volume are also provided.

Abstract: The invention relates to a single mode fiber optic coupler which is wavelength independent and a method of manufacture thereof. The coupler comprises two single mode fibers positioned side by side which are fused in a manner such that they taper down into a substantially circular cross section coupling region wherein the two cores of the fibers run therethrough. In its most preferred aspect to achieve wavelength independence, the fibers are selected to have indexes of refraction at the core which are sufficiently different such that uniform coupling throughout a broad range of light wavelengths is achieved.

Abstract: An interferometric sensor includes an optical fiber polarimetric sensing element (5) for detecting a required measurand and is configured so as to derive interference output signals, which are simultaneously monitored by photodetectors (9, 11), from both conventional, for example, Michelson, and polarimetric interferometer arrangements. The sensor therefore offers the high resolution of a conventional interferometer in conjunction with the increased dynamic range of a polarimetric device.

Abstract: A temperature sensor comprises a single-mode all-fiber Michelson interferometer. The interferometer includes a bi-directional coupler and signal and reference fibers having mirrored ends. These two fibers are of unequal lengths to provide an optical path length in-balance and the signal fiber may have a metal temperature sensing probe at its mirrored end. The injection current of a laser light source for the interferometer is modulated with a ramping signal so that a linearly moving interference pattern is produced at the output by mixing of the reflected beams propagated in the signal and reference fibers.

Abstract: Optical pressure sensing apparatus comprises an optical fibre interferometer arranged to sense the movement of a pressure responsive element and produce an interference signal at its output which can be monitored and processed to measure changes in the pressure applied to the pressure responsive element. The interferometer comprises a signal arm coupled to the pressure responsive element and a fixed reference arm. A light source supplies light to the input of the interferometer via an optical fibre and monitoring and processing electronics connected to the output determine the optical phase shift between the light beams propagated in the signal and reference arms and produce a pressure reading.

Abstract: A polarmetric fiber sensor comprises a lead fiber (1) and a shorter length of sensing fiber (2). Both fibers comprise higly birefringent optical fiber having orthogonal eigen modes and are spliced together with their eigen modes mutually rotated by 45.degree.. The sensing fiber (2) has a reflective distal end (6). Linearly polarized light from a laser source (3) is launched into one mode of the lead fiber (1) and light reflected from the distal end of the sensing fiber is recovered from the other mode of the lead fiber via a beam splitter (7) and photodiode (8). The resulting electrical signal produced by the photodiode (8) corresponds to the modal birefringence of the sensing fiber (2) and changes in this birefringence are monitored by processing means (9) to detect changes in a physical parameter sensed by the sensing fiber.