Overview of an all-optical analog-to-digital converter, focusing of deflected TeraHertz optical pulse and propagation characteristics

Wen Ren Yang, Timothy Renkoski, William Nunnally

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


The Advanced Radars and Electro-Optical Sensors group at the University of Missouri is constructing a new all-optical analog-to-digital converter (ADC) platform. This integrated optics application especially suits the data acquisition and processing requirements of mobile sensor systems that have dramatically increased alongside the requirements for reductions in system mass, volume, and power consumption. The platform of the ADC is composed of a direct-modulated laser (DML) at λ = 1.55μm with a 40 G bits/sec sampling optical pulse source; a prism LiTaO 3 (lithium tantalate) electro-optical deflector; an integrated focusing unit; a three-dimensional binary-coded spatial filter array; and collection optics. Using discrete Fourier transform, we also investigate both the center frequency-shifting phenomenon of the optical pulse propagation, and the frequency response. The simulations are calculated by using the two-dimensional Finite Difference Time Domain (FDTD) method, the results of which are much more reliable than Beam Propagation Methods (BPM). The spatial filter array and collection optics will be fabricated by the separated implanted oxygen process (SIMOX), silicon on insulator (SOI). Also, a new design and simulation of electro-optical deflector to be integrated in the same substrate is proposed. This platform is to be tested for 50 Giga-samples/sec analog-to-digital conversion, and be the prototype of a 100 Giga-samples/sec ADC.

Original languageEnglish
Article number08
Pages (from-to)62-73
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2005
EventEnabling Photonics Technologies for Defense, Security, and Aerospace Applications - Orlando, FL, United States
Duration: 2005 Mar 312005 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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