Dr. Ing. habil Ajay Poddar of University of Oradea, Romania

Frequency stable local oscillators are an important component in heterodyne detection and coherent communication systems. The state of art electronic oscillator performance at 10GHz are recently advanced by using Mobius Dielectric Resonator oscillator (DRO), where high quality factor of over 3000 are reported that  leads to close-in to carrier phase noise of -83dBc/Hz at 1kHz offset carrier. However, additional improvements are required, when stable clock sources are to be used in instrumentation, communications, and radar applications. Self-injection locked phase lock loop (SILPLL) is used with fiber optical link delays to provide feedback in phase noise reduction of local DRO. This technqique combines the benefits of both close-in and far away from carier phase noise reduction by simultaneous combining SIL and SPLL.

This TALK discusses the comparison of a various realization of the various fiber delay elements using both EAM-LD and DD-MZM based structures. 

Biography:

Dr. Ajay K. Poddar graduated from IIT (India Institute of Technology) Delhi, India; Doctorate (Dr.-Ing.) from TUB (Technical University Berlin), Germany;  Post Doctorate (Dr.-Ing. habil) from BTU (Brandenburg Technology University Cottbus), Senftenberg, Germany.  Dr. Poddar is a Chief Scientist at Synergy Microwave, Visiting Professor at Oradea University-Romania, Guest lecturer at Technical University Berlin-Germany; Academic Advisory Board Member of Don Bosco Institute of Engineering, Bombay.

At Synergy Microwave, Dr. Poddar is responsible for design and development of host of frequency generating and signal processing modules for industrial and space communication applications.  Previously, he worked as a Senior Scientist from 1991-2001 at Defense Research & Development Organization (DRDO), India where he was program manager of many scientific projects. Dr. Poddar’s scientific career has made a profound effect on the electronics industry notably in the area of high performance microwave systems, which include oscillators, synthesizers, mixers, and microwave circuit design techniques; commercialized and produced in million for both commercial and space applications. 

Dr. Poddar has received several awards for his scientific achievements, technological innovations, and meritorious services; holds several dozen patents and published over 250 scientific papers in international conferences and professional journals, contributed as an author/coauthor of 6-technical books. Dr. Poddar’s photo depicted on the cover page of Microwave Journal (vol. 54, No.11, November 2011) for his 25 years of scientific contributions, cited as one ­­­of “Divine Innovators” in the advancement of microwave technologies based on global voting. Dr. Poddar recently selected by the IEEE Ultrasonics, Ferroelectrics, and Frequency Control (IFCS) to receive the prestigious 2015 IFCS W.G. Cady Award in recognition of his outstanding contributions on the analysis, design, and development of a host of frequency control products exhibiting state-of-the-art performance, including the development of extremely low noise crystal oscillator circuitry.

Email:

Address:University of Oradea, , Romania, Romania, 410087

Dr. Ajay Poddar

Address:United States