Lucent Technologies Inc.

At&t Bell Laboratories

Other

At+t Corp.

Ronald Edward Scotti

Christi Kay Madsen

Greg E Blonder

Yiu-Huen Wong

Charles H Henry

Gadi Lenz

Mark Anthony Cappuzzo

Harold R Clark

Herman M Presby

Edwin Arthur Chandross

John David Weld

Vladimir Anatolyevich Aksyuk

David John Bishop

Nagesh R Basavanhally

Joseph Shmulovich

Cristian A Bolle

Randy Clinton Giles

Yuan P Li

Arturo Hale

Valerie Jeanne Kuck

William Baxter Joyce

John VanAtta Gates

Edward J Laskowski

Rudolf Feodor Kazarinov

A fiber array faceplate for receiving, precisely positioning and immobilizing bare optical fiber. The faceplate includes a plate arrangement of at least two mutually parallel plates each having an array of fixed apertures. At least one of the plates is movable in translational motion such that the at least two plates collectively define an array of adjustable-size apertures that can open wide enough to readily receive bare optical fiber and then decrease in size to immobilize the received optical fiber.

Fiber array coupler

An all-pass optical filter which reduces the dispersion of optical pulses transmitted therethrough is disclosed. The all-pass optical filter reduces the dispersion of optical pulses by applying a desired phase response to optical pulses transmitted therethrough. The all-pass optical filter also has a frequency independent amplitude response. The all-pass optical filter has a structure which includes at least one feedback path, a splitter/combiner, an input port, and an output port.

All-pass optical filters

An optical signal processing apparatus includes at least two mirror array chips mounted on an upper surface of a base in close proximity to each other to form a compound array. Each mirror array chip includes a substrate, and a plurality of spaced-apart mirrors mounted on an upper surface of the substrate. The mirrors are movable in response to an electrical signal. A plurality of electrical leads for conduct the electrical signals to the mirrors, at least a portion of the electrical leads extending at least partially along the upper surface of the base between a lower surface of the substrate and the upper surface of the base.

Hybrid electro-optic device with combined mirror arrays

A method for nondestructively and accurately determining the stress of a fabricated semiconductor chip soldered, brazed or otherwise bonded to a submount using optical microscopy and finite element analysis. Deformations on a top surface of the semiconductor chip are first examined using optical microscopy. The deformations are then correlated using finite element analysis to the stress on the semiconductor chip caused by the soldering process. If the stress is determined to be within an acceptable range of measurement, then the semiconductor chip will have been properly soldered to the submount and can be used.

Method for nondestructively measuring the stress of fabricated semiconductor chips

In accordance with the invention, an optical multiplexer includes at least one reconfigurable add-drop unit that can add-drop one channel out of a large set by switching the light path through one of a set of fixed add-drop filters. Reconfiguration is done by switching from the add-drop filter path to a bypass path, changing to a different add-drop filter and then switching back. The phase delay of the bypass path is adjusted to maintain nearly maximum transmission during switching. The selection among add-drop filters is done by sliding an integrated optic chip with the set of add-drop filters between input and output waveguides. The reconfigurable add-drop multiplexer unit is latchable, passive between reconfigurations, and has low intrinsic insertion loss. Plural units in series can add/drop plural channels.

Reconfigurable add-drop multiplexer for optical communications systems

The thermo-optically controlled optical couplers wherein the coupling region between the waveguides in the coupling section is filled with a material having a high dependence of refractive index on temperature thus making the thermo-optic control means more efficient and allowing a greater range of adjustment in the coupling coefficient for a given temperature change.

Tunable directional optical waveguide couplers

An integrated optical device for tapping signal power provides a tap which is substantially independent of wavelength and polarization. The optical device includes a first tap consisting of a first optical waveguide carrying an input signal S disposed in coupling relation with a second optical waveguide for providing an output cross-state transmission T.sub.1. The cross-state transmission T.sub.1 is polarization and wavelength dependent. The optical device further includes a second tap consisting of a third optical waveguide disposed in coupling relation with and in series with the second optical waveguide carrying the output cross-state transmission T.sub.1 for providing an output bar-state transmission T.sub.2. The bar-state transmission T.sub.2 has an opposite dependency on waveguide coupling than that of the cross-state transmission T.sub.1 and, thus, compensates for wavelength and polarization dependencies of the cross-state transmission signal T.sub.1, thereby providing an overall tap transmission T which is equal to T.sub.1 T.sub.2 and is substantially independent of polarization and wavelength.

Polarization and wavelength independent optical waveguide tap

A turning mirror in an optical waveguide structure is made by etching in the upper surface of the structure a cavity (18) that intercepts the path of light propagated by the waveguide (15, 16, 13). Preferably, the cavity is made to be asymmetric with the side (25) of the cavity remote from the waveguide sloping at typically a forty-five degree angle. The asymmetry can be introduced by using mask and etch techniques and treating the surface of the structure such that the etchant undercuts the mask on the side of the cavity remote from the waveguide to a greater extent than it undercuts the mask on the side of the cavity adjacent the waveguide.

Optical waveguide structure including reflective asymmetric cavity

Methods for making mirrors

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White House Station, NJ, United States of America

Ronald Edward Scotti