This inventor holds 8 USPTO granted patents. Top assignees: Ciena Corporation, Agere Systems Inc., Agere Systems Guardian Corp.. Active years: 2002-2005.
Location History:
- Macungie, PA (US) (2003)
- Silver Spring, MD (US) (2002 - 2005)
Company Filing History:
3 out of 2,070 
2 out of 2,316 
1 out of 598 
Years Active: 2002-2005
Title: Si Hyung Cho: Innovator in Optical Technologies
Introduction
Si Hyung Cho is a prominent inventor based in Silver Spring, MD (US). He has made significant contributions to the field of optical technologies, holding a total of 8 patents. His work focuses on enhancing the performance and efficiency of optical systems, particularly in wavelength division multiplexing (WDM) and optical amplifiers.
Latest Patents
One of Cho's latest patents is titled "Wavelength locking scheme and algorithm for ultra-high density WDM system." This invention addresses the challenges of maintaining a stable laser wavelength in WDM systems with channel spacings of 25 GHz or less. The method involves using a filtering element, such as an in-fiber Bragg grating, to sense and adjust the laser temperature and wavelength based on the temperature of the filtering element. This ensures that wavelength variations due to temperature changes are compensated, allowing for a fixed output wavelength.
Another notable patent is the "Method and apparatus for expanding the dynamic range of optical amplifiers." This invention introduces a power control circuit that enhances the dynamic range of optical amplifiers. By using a modulated signal to control the electrical current supplied to the optical pump, the invention allows for a continuous output signal from the amplifier. Feedback mechanisms are employed to maintain target power levels, thereby improving performance, especially in low power regions.
Career Highlights
Throughout his career, Si Hyung Cho has worked with leading companies in the technology sector, including Ciena Corporation and Agere Systems Inc. His expertise in optical technologies has positioned him as a valuable asset in the development of advanced optical systems.
Collaborations
Cho has collaborated with notable professionals in the field, including William Crossley Dautremont-Smith and Sun-Yuan Huang. These collaborations have contributed to the advancement of optical technologies and the successful implementation of innovative solutions.
Conclusion
Si Hyung Cho's contributions to optical technologies through his patents and collaborations highlight his role as a key innovator in the field. His work continues to influence advancements in optical systems, ensuring improved performance and efficiency.