Senior Research Staff

The PSI research and development team consists of world renowned engineers and scientist in the application of photonic technology in analog, RF and microwave systems.  PSI staff members have produced more than 200 technical publications on these topics and have received international recognition for their contributions to the analysis, design and implementation of optical links. The senior research staff at PSI includes:

  • Dr. Edward Ackerman
  • Dr. Gary Betts
  • Dr. Charles Cox
  • Dr. Robert Mailloux

In addition to its senior research staff, PSI employs a top notch development engineering team fully capable of transforming cutting edge R&D lab demonstrations into robust, commercially available products.

Dr. Edward I. Ackerman
Dr. Ackerman is PSI’s Vice President for Research and Development. Among his accomplishments are the lowest noise figure ever demonstrated for an amplifier-free analog optical link (2.5 dB at 130 MHz), and a novel linearization technique that uses a standard LiNbO3 modulator with only one electrode to enable improved analog optical link dynamic range across broader bandwidths than other linearization techniques currently allow.  Dr. Ackerman delivered the introductory tutorial talk for the workshop, “Linearization Techniques for Optical Links” at the IEEE’s 2004 International Microwave Symposium in Ft. Worth.  Additionally, as Technical Program Chair for the IEEE’s 2004 International Topical Meeting on Microwave Photonics in Ogunquit, Maine, he organized a special session on “Improving the Dynamic Range of Microwave Photonic Systems.”  He has co-edited a book and has authored or co-authored three book chapters, among them an invited chapter in Photonic Aspects of Modern Radar (edited by Zmuda and Toughlian).  He holds three US patents.

Dr. Gary E. Betts
A Staff Scientist at PSI, Dr. Betts was a Member of the Technical Staff at MIT Lincoln Laboratory from 1985 – 2002, where he designed and fabricated high-performance lithium niobate integrated optical modulators and analog fiber-optic links.  He pioneered bandpass linearization of lithium niobate modulators, demonstrating some of the highest optical link dynamic ranges ever reported.  He also produced modulators with extremely low Vπ, as low as 180 mV, in the VHF and UHF frequency range, and developed several acoustic suppression techniques that allowed these modulators to be used in high-performance RF signal processing systems.  His research at MIT also included the investigation of bias drift phenomena in lithium niobate and research on semiconductor modulators and high-power semiconductor optical amplifiers.  In 2002, he co-founded a startup company based on one of his patents for a high-speed, low-voltage electro-optic modulator, and developed a 40 Gbit/s modulator.  He joined PSI in 2005.  At PSI, he has contributed to the development of high-performance microwave photonic links with noise figure as low as 4 dB at 3 GHz.  He also developed a linear phase-to-voltage receiver for a phase-modulated optical link that has dynamic range capability beyond even that of linearized photonic links.  He has authored over 70 papers in integrated and fiber optics and holds 5 patents. 

Dr. Charles H. Cox, III
President and CEO of Photonic Systems, Dr. Cox is one of the pioneers of the field that is now generally referred to as analog or RF photonics, and has been active in the field for over 25 years.  Among his notable technical achievements are the establishment of the theoretical basis for and the first experimental demonstration of amplifier-free optical links with gain.  He is presently a member of the Advisory Group on Electron Devices (AGED), which is an advisory panel to the Office of the Secretary of Defense.  He has participated in 8 government-industry studies in the area of photonics, and has served on the committees of 16 conferences in a variety of roles including general chairman and technical program chair.  He holds 6 U.S. patents, has given 45 invited talks on photonics, and has published over 70 papers.  He is the author of the textbook Analog Optical Links: Theory and Practice (Cambridge University Press, 2004), has co-edited another book, and has written chapters for two other books.  He was elected a Fellow of the IEEE for his contributions to the analysis, design and implementation of analog links. He is also a member of Sigma Xi and the Optical Society of America.

Dr. Robert J. Mailloux
Dr. Robert J. Mailloux received the BS degree in Electrical Engineering from Northeastern University, Boston, MA, in 1961, and the SM and PhD degrees at Harvard University, Cambridge, MA, in 1962 and 1965, respectively. Currently, he is a Distinguished Staff Member at Photonic Systems where he recently completed a study for PSI of transmitter-receiver isolation using adaptive control of a tapped-delay canceller system.  This study included mutual coupling and (active) array element patterns, and led to an experimental optimization demonstration at PSI for DARPA’s Ultra-Wideband Multifunction Photonic Transmit/Receive Module (ULTRA-T/R) program.  ULTRA-T/R was administered by the Navy’s Space and Naval Warfare Systems Command (SPAWAR). Dr. Mailloux was also a Senior Scientist at the Sensors Directorate, Air Force Research Laboratory, Hanscom Air Force Base, MA. He has served as the Chief of the Antennas and Components Division, Rome Laboratory, and as a physicist at the Air Force Cambridge Research Laboratory. He is the author or co-author of numerous journal articles, book chapters, and the book Phased Array Handbook (Artech House, 1994). His research interests are in the areas of periodic structures and antenna arrays.
Dr. Mailloux was President of the IEEE Antennas and Propagation Society in 1983, and in 1992 he received the IEEE Harry Diamond Memorial Award. He recently received the IEEE Third Millennium Medal. He is a member of Tau Beta Pi, Eta Kappa Nu, Sigma Xi, and Commission B of the US National Committee of the International Union of Radio Science. He has been a Distinguished Lecturer for the Antennas and Propagation Society, and was the Chair of the AP-S IEEE Press Liaison Committee.