International Business Machines Corporation

Kenneth Paul Jackson

Clint Lee Schow

Michael Anthony Sorna

Steven John Baumgartner

William K Hogan

Mitchell S Cohen

Michael Frank Cina

Modest M Oprysko

Ephraim Bemis Flint

Kurt R Grebe

Stephen J Ames

John Farley Ewen

Steven John Zier

Norman Raver

Michael William Marlowe

Douglas J Hall

A switchable bandwidth optical receiver is implemented in a front-end of the receiver in at least one of three ways. A switchable impedance may be provided at the input to a preamplifier of the front end, the preamplifier of the front-end may have a switchable impedance therein, and/or a switchable filter may be provided at an output of the preamplifier.

Switchable-bandwidth optical receiver

An optical transceiver with a transimpedance amplifier generates a dynamic common mode voltage of the peak-to-peak output current of the photodetector for use as an in-situ optical power meter. Peak-to-peak voltage signal are imposed on the common mode voltage so optical power measurements are obtained using preexisting electrical contacts. An nfet and a capacitor of the transimpedance amplifier smooths the peak-to-peak voltage to create the control signal for the common mode voltage. The common mode current is mirrored into a bank of pfets at the output stage to create a current sink. Depending upon the potential of the common mode voltage, more or less current will be drawn from the peak-to-peak voltage signals output from a final differential amplifier stage of the transimpedance amplifier.

Optical power meter derived from common-mode voltage of optical transimpedance amplifier

Methods and apparatus are set forth for passively and precisely aligning pairs of objects, in particular, microelectronic components such as semiconductor lasers and fibers, utilizing fiducial marks. Additionally, methods and apparatus are set forth for combining passive and active alignment techniques where high degrees of alignment precision are required. Still further, techniques are described for fixing prealigned objects, independent of how the objects are prealigned, to a mounting surface in a manner that maintains the relative (aligned) position of the objects. Further yet, in order to help minimize manufacturing costs with respect to production of, for example, microelectronic assemblies, batch processing techniques are described which utilize the novel alignment procedures contemplated by the invention.

Methods and apparatus for precise alignment of objects

In an electrical circuit including a first array and a second array of electrical components mounted on a circuit board having an electrically conductive cladding, there is provided a system for interconnecting the components of the first array to the components of the second array with parallel signal channels for reduction of crosstalk among the channels. In each of the channels, there is one electrically conductive strip formed within the cladding and providing for a path of current in a first direction, and a second conductive path for current in the reverse direction. The second path includes a wire lead formed as a partial loop extending in a plane perpendicular to a plane of the cladding, and also includes a pad formed of material of the cladding and coplanar with the conductive strip. The pad is connected to a terminus of the wire loop. The pad is insulated from the conductive strip and forms therewith a portion of a loop which generates a magnetic field in the presence of currents flowing through the two paths. Magnetic coupling provided by the wire loops has a positive coefficient of mutual inductance which cancels negative mutual inductance of loops lying in a plane of the cladding to reduce crosstalk among the channels.

Wire bond connection system with cancellation of mutual coupling

Growing community of inventors

Rochester, MN, United States of America

Kenneth Paul Jackson