Company Filing History:
Years Active: 1982-1984
Title: Pierre Poulain: Innovator in Optoelectronics
Introduction
Pierre Poulain is a notable inventor based in Paris, France. He has made significant contributions to the field of optoelectronics, particularly in the development of phototransistors. With a total of 3 patents to his name, Poulain's work has advanced telecommunications technology.
Latest Patents
One of his latest patents is a light-emitting and receiving transistor designed for operation in alternate modes. This innovative phototransistor can operate alternately in emission and reception modes, making it suitable for coupling with optical fibers in telecommunications systems. The design features an active layer that forms a heterojunction with two layers of opposite conductivity types, which serve as the emitter and collector. The base contact is created by a heavily doped region, defining the useful zone for photon coupling with optical fibers.
Another significant patent is for a heterojunction phototransistor constructed using planar technology. This design facilitates the easy formation of contact connections for the transistor base, which is located within the intermediate layer of an npn stack. The process involves a first diffusion of doping impurity to form the base region, followed by the implantation of an opposite-type impurity to create the emitter region. The substrate serves as the collector, with connections made on the free face for the base and emitter.
Career Highlights
Pierre Poulain has worked at Thomson-CSF, a company known for its advancements in telecommunications and defense technologies. His role there has allowed him to contribute to cutting-edge research and development in optoelectronic devices.
Collaborations
Throughout his career, Poulain has collaborated with notable colleagues, including Baudouin De Cremoux and Pierre Hirtz. These partnerships have fostered innovation and have been instrumental in the development of new technologies in the field.
Conclusion
Pierre Poulain's contributions to optoelectronics and telecommunications through his patents and collaborations highlight his role as a significant inventor in the industry. His work continues to influence advancements in technology today.