Company Filing History:
3 out of 16 
2 out of 84 
1 out of 851 
Years Active: 2001-2006
Title: The Innovations of Kejian Guan
Introduction
Kejian Guan is a prominent inventor based in San Jose, California, known for his significant contributions to the field of optical technology. With a total of six patents to his name, Guan has made remarkable advancements, particularly in the development of erbium-doped fiber amplifiers.
Latest Patents
Guan's latest patents include innovative designs for erbium-doped fiber amplifiers (EDFAs) and integrated module components. One of his notable inventions features an EDFA with integrated input and output modules. This design incorporates a packaged pump laser diode mounted to the metal EDFA package, which serves as a heat sink for the pump laser diode. The pump laser light is transmitted over an optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is crafted from an optical fiber that better matches the transmission modes in the erbium-doped optical fiber section, featuring an end subsection of single-mode fiber for a larger numerical aperture. Additionally, collimating lenses enhance the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module includes a photodiode with a tap filter to monitor the output power of the EDFA, along with an optical isolator to prevent interference in the erbium-doped optical fiber section. This innovative design allows for various arrangements and combinations of the integrated input and output modules with the erbium-doped optical fiber section, resulting in EDFAs that can be manufactured relatively inexpensively in very small packages compared to current EDFA packages.
Career Highlights
Throughout his career, Kejian Guan has worked with notable companies such as Lightwaves 2020, Inc. and E-Tek Dynamics, Inc. His expertise in optical technology has positioned him as a key figure in the industry, contributing to advancements that enhance communication systems.
Collaborations
Guan has collaborated with esteemed colleagues, including Jing-Jong J Pan and Xiangdong Qiu, further enriching his work and expanding the impact of his innovations.
Conclusion
Kejian Guan's contributions to the field of optical technology, particularly through his patents on erbium-doped fiber amplifiers, demonstrate his innovative spirit and commitment to advancing communication systems. His work continues to influence the industry and pave the way for future developments.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.