Company Filing History:
Years Active: 2019
Title: The Innovations of Patrick T. Callahan
Introduction
Patrick T. Callahan is a notable inventor based in Cambridge, MA (US). He has made significant contributions to the field of laser technology, particularly in the development of methods and apparatus for mode-locking on-chip lasers. His work has implications for high-speed optical communication and advanced laser applications.
Latest Patents
One of Patrick T. Callahan's key patents is titled "Methods and apparatus for mode-locking on-chip lasers." This patent describes an artificial saturable absorber that utilizes additive pulse mode-locking to enable pulse operation of on-chip laser systems. The invention includes four different artificial saturable absorbers, each designed to enhance the performance of on-chip lasers. The first design features an integrated coupler with two arms, each containing an implementation of the end-reflector and a phase bias element. The second design incorporates an integrated directional coupler and two integrated waveguide arms. The third design includes an integrated birefringent element, a birefringent-free waveguide, and an integrated polarizer. Lastly, the fourth design utilizes a multimode waveguide that allows for various modes to propagate, creating a nonlinear phase difference between the modes. These innovations enable the generation of sub-femtosecond optical pulses at high repetition rates using passive mode-locking.
Career Highlights
Patrick T. Callahan is affiliated with the Massachusetts Institute of Technology, where he continues to advance research in laser technology. His work has garnered attention for its potential applications in various fields, including telecommunications and medical devices.
Collaborations
Throughout his career, Patrick has collaborated with esteemed colleagues such as Katia Shtyrkova and Erich P. Ippen. These collaborations have further enriched his research and contributed to the advancement of laser technology.
Conclusion
Patrick T. Callahan's innovative work in the field of on-chip lasers exemplifies the intersection of technology and research. His contributions are paving the way for future advancements in optical systems and high-speed communication.