Location History:
- Pepperell, MA (US) (1991 - 2012)
- Cambridge, MA (US) (2016 - 2022)
Company Filing History:
19 out of 8,384 
1 out of 4,997 
Years Active: 1991-2022
Title: **John J Zayhowski: Innovator in Optical Fiber Technologies**
Introduction
John J Zayhowski, based in Pepperell, MA, is a prolific inventor known for his significant contributions to optical fiber technologies, holding a remarkable 20 patents. His work has profoundly impacted the field of fiber amplifiers and lasers, offering solutions to some of the challenges faced in high-power optical applications.
Latest Patents
Among his latest innovations are two notable patents:
1. **Optical filtering to stabilize fiber amplifiers in the presence of stimulated Brillouin scattering**
This invention addresses the limitations of multi-stage fiber amplifiers, which can amplify signals from a few Watts to several kilowatts. The challenge faced is the intensity instabilities caused by nonlinear optical effects, specifically stimulated Brillouin scattering (SBS), which can produce damaging high-intensity pulses that propagate backward in the amplifier chain. This patent proposes the use of an optical isolator to block backward-propagating light and introduces a filter with a broad reject band, allowing for a suppression ratio of greater than 30 dB. This innovation enables higher power operation while maintaining system stability.
2. **Metalized double-clad optical fiber**
Zayhowski's second patent revolves around the enhancement of double-clad optical fibers, which are utilized in amplifying and guiding light. Conventional polymer cladding presents challenges in heat dissipation, particularly at high altitudes. To overcome this, he developed metallized polymer-clad optical fibers that feature a thin chrome layer coated with a thicker copper layer. This design significantly improves heat dissipation, allowing for efficient operation of high-power optical signals without introducing phase noise.
Career Highlights
John J Zayhowski’s professional journey has included esteemed positions at renowned institutions. Notably, he has worked with the Massachusetts Institute of Technology (MIT) and the United States of America as represented by the Secretary of the Air Force. His experience at these leading organizations has supported his innovative pursuits in the field of optical fiber technology.
Collaborations
Throughout his career, Zayhowski has collaborated with distinguished colleagues, including Aram Mooradian and Mordechai Rothschild. These collaborations have fostered the sharing of ideas and knowledge, further enhancing the development of groundbreaking optical technologies.
Conclusion
John J Zayhowski's contribution to optical fiber innovation exemplifies the impact of dedicated inventors in advancing technology. With his 20 patents, he continues to push boundaries and address critical challenges within the field, paving the way for future advancements in high-power optical applications.