Company Filing History:
1 out of 1,156 
1 out of 2 Years Active: 2003-2005
Title: The Innovations of Charles John Donaldson
Introduction
Charles John Donaldson is an accomplished inventor based in Ottsville, PA (US). He holds 2 patents that showcase his expertise in optical technology. His work has significantly contributed to advancements in optical amplifier control systems.
Latest Patents
One of Donaldson's notable patents is the "Optical amplifier controller having adjustable slew-rate limiter." This invention provides a method and apparatus for controlling the optical output power from an optical amplifier arrangement. The system includes a rare-earth doped fiber that imparts gain to an optical input signal. A pump source supplies pump power to the fiber, while a tap receives a portion of the output power and converts it into a control signal. The controller generates a bias current in response to this control signal, ensuring that the pump power does not vary at a rate exceeding the slew-rate limit established by the controller. This innovation helps avoid resonance between the input signal and the feedback control loop frequency.
Career Highlights
Throughout his career, Donaldson has worked with notable companies, including General Instrument Corporation. His experience in the field has allowed him to develop cutting-edge technologies that enhance optical systems.
Collaborations
Donaldson has collaborated with several professionals in the industry, including Eric James Converse and David Ciaffa. These partnerships have contributed to the successful development of his inventions.
Conclusion
Charles John Donaldson's contributions to optical technology through his patents and collaborations highlight his role as a significant inventor in the field. His work continues to influence advancements in optical amplifier systems.