Raychem Limited

Raynet Corporation

C-cor.net Corporation

Qualop Systems Corporation

Nelson M Shen

Marc F Moisson

John P Arrington

Gerald L Shimirak

Gary L Wagner

Joseph Zucker

Philip B Vail

Ching Ho

Narendra Kulkarni

Nils Wydler

Mel Nance

Robert Zimmerman

Frank H Levinson

Bruce D Campbell

David A Horsma

Anthony Vranicar

Wendell W Moyer

Alexandru S Gliga

Mohamed Hussein Higgy

Sunny K Hsu

Yue-Syan Jou

Robert Schlingensiepen

David E James

Tom Call

Peder Rodhe

Steve Diaz

Paul Von Lippe

Akira Nakazato

Dave Horsma

Abraham Y Jou

Peter Lundquist

Gengxin Li

Vinh P Le

AbdulMohamed Tayeb

David R Myers

A predistortion circuit and method provides signals to oppose and cancel an anticipated phase and frequency distortion in a coupled electrical system. The predistortion circuitry includes first and second subcircuits which include opposing diodes, providing 180 degree out-of-phase and in-phase signals to produce second, third and higher order predistortion outputs.

Linearization circuits and methods

A method of forming a tap into an intermediate point on a continuous coaxial cable, and a coaxial cable tap housing suitable for forming such a tap. The tap housing includes a recess and an alignment element having a predetermined spatial relationship with the recess. The recess has an entry, an exit and a passage connecting the entry and exit. When the tap housing is fixed to a cable, the exit of the recess is closer to the outer conductor of the cable than the entry of the recess is to the outer conductor. The alignment element is used to position a cutting tool which is inserted through the entry of the recess to form an opening in the outer conductor and a cavity in the dielectric under the opening. A tap insert, which includes a coupler assembly, is mounted to the housing, and the coupler assembly is inserted through the entry of the recess and through the opening into the cavity formed in the cable. In specific embodiments, the recess and opening are elongated.

Coaxial cable tap with slitted housing and non-piercing tap insert

An inexpensive coaxial cable connector, and an inexpensive contact which is suitable for use in an such an inexpensive coaxial cable connector, the connector and the contact being capable of passing electrical signals from low frequency power up to and including telecommunications signals in the range of 1 GHz or more. The connector comprises an elongate, hollow, conductive, cylindrical barrel having an inner radius, R.sub.BARREL, and a first longitudinal axis; and an elongate, conductive contact. The contact has a first end and a second end which define a length therebetween, a second longitudinal axis, and comprises a cylindrical section. The cylindrical section has an outer radius, R.sub.CONTACT, which is less than R.sub.BARREL. The cylindrical section comprises a first external end which is coincident with one of the first end and the second end of the contact, a hollow interior, a first longitudinal slot, the slot located near the external end of the cylindrical section, and has a proximal end and a distal end. The contact also comprises a first spring-tab which is located within the first longitudinal slot and formed from a cut-out which forms the first longitudinal slot. The spring-tab has a fixed end and a free end, the fixed end joined at the proximal end of the slot. The first spring-tab extends generally from the proximal end of the slot toward the distal end of the slot and into the hollow interior of the cylindrical section. The connector comprises means for supporting the contact in the barrel so that the cylindrical section of the contact is contained within and spaced apart from the barrel and the second longitudinal axis is substantially coincident with the first longitudinal axis. The supporting means comprises a dielectric material.

Coaxial cable connector

An environmentally sealed electronics assembly. The assembly includes a flexible envelope surrounding the active electronics board. The electronics board is insertable into the envelope and with subsequent sealing provides a reenterable but environmentally sealed active electronics package. Methods of manufacturing the assembly are also described.

Sealed electronic packaging for environmental protection of active

An optical isolator system and method improving the manufacturability of the system, including fabricating a unitary tubular optical isolator system in two parts which are soldered together. The tubular system includes an internal disk to protect the isolator from heated solder during joinder of containment portions. The optical isolator system includes tubes to space polarizer, analyzer, and isolator portions.

Optical isolator system and method

An optical fiber water sensor includes a mandrel having a convex or concave shape adjacent to an optical fiber which is adjacent to a water swellable material held in a reservoir. Upon coming in contact with water, the material swells and deforms a section of the optical fiber about a contour defined by the mandrel thus attenuating a signal propagating through the fiber which is detected by an optical detector to indicate the presence of water.

Optical fiber water sensor

An optical receiver includes a photodetecting device and a wide band video amplifier. The photodetecting device and the video amplifier are coupled by reactive elements which are selected to provide a highly linear and highly sensitive response over a frequency range of approximately 400-950 MHz. The crosstalk between two signals are ten parts per billion when the laser power is at 1 milliwatt and modulation is 25 percent per signal. The noise generated by the receiver is only equivalent to 6 billionth of an ampere. The receiver uses commerically available components.

Apparatus and method for a linear, wideband sensitive optical receiver

An optical fiber read or write tap includes a substrate having a substantially flat upper surface on which two separated grooves are formed, a light element being disposed in the second groove so as to be capable of coupling light with a bent portion of an optical fiber disposed in the first groove.

Distribution optical fiber tap

A method of aligning an optical signal source and a waveguide which comprises; directing the signal into the waveguide, monitoring the intensity of the signal backscattered along the waveguide, and altering the relative positions of source and waveguide in response to said intensity.

Alignment of optical waveguides

An apparatus for injecting light into or withdrawing light from an optical fiber using a resiliently deformable material includes a hard transparent member disposed in contact with a surface of the resiliently deformable material in a vicinity of a light element which minimizes material creep of the resiliently deformable material in a vicinity of the light element which stabilizes a coupling and decoupling efficiency with an optical fiber.

Apparatus for coupling light between an optical fiber and a light element

An article suitable for use in the adhesive joining of two optical fibers with low light loss comprises a tubular container an inner surface of which is coated with a release agent and/or is composed of an inherently releasing material, which is larger in cross-section at the ends than at a central region, the smaller central region being where the ends of the fibers are joined.

Optical fiber adhesive joint tube

An optical coupler for withdrawing light from an optical fiber includes first and second movable members on which are mounted a plurality of bending posts offset longitudinally relative to one another. A retaining post, offset longitudinally from the bending posts, has a groove therein so that an optical fiber can be wrapped therearound. Thereafter, the first and second members are moved towards each other such that the bending posts interleaf and bend the optical fiber in a plurality of positions causing light to be emitted from the optical fiber at bent portions thereof, which light is detected by optical detectors located behind the bending posts.

Optical fiber coupler

A method and apparatus for determining a dB loss across an optical fiber splice includes the steps of determining a first maximum detected optical signal when the fiber ends are moved relative to each other in a X direction, determining a second maximum optical signal when the fiber ends are moved relative to each other in a Y direction, determining a third optical signal when the fiber ends are optimally substantially aligned, determining a fourth optical signal when subsequent to the fiber ends actually being secured to each other.

Determining splice attenuation

A method and apparatus for determining optical power attenuation across a splice between first and second optical fibers utilizes the algorithm:

Method and apparatus for determining attenuation across optical fiber

This invention provides a method and apparatus for making certain measurements across a splice of a first optical fiber and a second optical fiber, then calculating the actual decibel attenuation across the splice for optical signals transmitted through the fibers during actual use. The method of this invention involves measuring the optical power P.sub.2 in the second fiber with the fiber ends separated longitudinally a certain distance, then measuring the optical power P.sub.1 in the second fiber with the fiber ends positioned close together for effecting the splice. The attenuation is calculated from the formula

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San Jose, CA, United States of America

Nelson M Shen