Company Filing History:
Years Active: 1985-1993
Title: The Innovations of Roger P. Holmstrom
Introduction
Roger P. Holmstrom is a notable inventor based in Wayland, MA (US). He has made significant contributions to the field of semiconductor technology, holding a total of 7 patents. His work has advanced the capabilities of semiconductor lasers and optical amplifiers, showcasing his expertise and innovative spirit.
Latest Patents
One of Holmstrom's latest patents is focused on a structure for indium phosphide/indium gallium arsenide phosphide buried. This invention describes a semiconductor laser that achieves a high modulation bandwidth by utilizing an InGaAsP cap layer and an InGaAsP active layer of different crystal structures. The design includes anisotropically etched channels through the cap, cladding, and active layers, which are partially etched through the buffer layer. The active and cap layers are laterally etched, and a semi-insulating material is overlaid on the sidewalls. This innovative approach has led to the successful fabrication of 1.3 µm InGaAsP lasers with 3 dB bandwidths of 24 GHz and intrinsic resonance frequencies exceeding 22 GHz, marking the highest bandwidth ever reported for a semiconductor laser.
Another significant patent by Holmstrom is for a monolithically integrated semiconductor optical preamplifier. This device includes a semiconductor optical amplifier that is integrated with an optical detector, electrically isolated by an isolation region. The isolation region is made of a low-loss, preferably transparent, insulating material, which reduces facet reflectivity at the amplifier output. This invention also allows for alternative device structures, including a waveguiding layer and a tuning region for filtering spontaneous emission.
Career Highlights
Holmstrom's career has been marked by his work at GTE Laboratories Incorporated, where he has contributed to groundbreaking research and development in semiconductor technologies. His innovative designs and patents have positioned him as a leader in the field, influencing future advancements in optical devices.
Collaborations
Throughout his career, Holmstrom has collaborated with notable colleagues, including William Powazinik and Edmund Meland. These partnerships have fostered a creative environment that has led to significant technological advancements.
Conclusion
Roger P. Holmstrom's contributions to semiconductor technology through his patents and innovative designs have made a lasting impact on the industry. His work continues to inspire future developments in optical devices and semiconductor lasers.
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