Lucent Technologies Inc.

Agere Systems Optoelectronics Guardian Corp.

Wilbur Dexter Johnston, Jr

John William Osenbach

Philip J Anthony

Dirk Joachim Muehlner

Orval George Lorimor

Judith A Long

William James Minford

The invention is an optical waveguide device and a method for forming the device which provides enhanced stability. The device includes a pyroelectric substrate such as lithium niobate where the bulk resistivity of at least a portion of the substrate is reduced to 10,ohm cm or less by heating the substrate in a reducing atmosphere. This causes the substrate to be less susceptible to temperature variants which can otherwise result in dc bias drift and variation.

Optical waveguide device with enhanced stability

It has been found that through the use of ferrocene or iron pentacarbonyl based compounds, it is possible to produce semi-insulating epitaxial layers of indium phosphide-based compounds by an MOCVD process. Resistivities up to 1&times;10,ohm-cm have been achieved as compared to resistivities on the order of 5&times;10,ohm-cm for other types of semi-insulating epitaxial indium phosphide.

Semi-insulated indium phosphide based compositions

An integrated laser/modulator (&ldquo;ILM&rdquo;) operating with reduced chirping is formed on a single semiconductor substrate. A reduction in chirping and any resultant wavelength dispersion is realized by precisely controlling the length of a window region incorporated in the ILM in order to isolate the ILM's active regions from any residual reflections.

Process for making integrated laser/modulators

The invention is a photodetector device and a lightguide circuit incorporating the device. The photodetector device includes a semiconductor region for absorbing light which is incident on an edge surface of the device. The region above the absorbing region is narrow at the edge and fans out in the direction of light propagation in the device.

Growing community of inventors

Mendham Township, NJ, United States of America

Wilbur Dexter Johnston, Jr