Dr. Antonio J. Mendez
Mendez R&D Associates
| Organizer: IEEE Lasers and Electro-Optics Society |
| Title: Physical and Engineering Aspects of
Optical CDMA |
| Speaker: Dr. Antonio J. Mendez Mendez R&D Associates |
| Abstract: Code division multiple access (CDMA) is elegantly described in a conversation between Claude Shannon and Robert Price: "...(CDMA) seemed like a very democratic way to use up the coordinates that you have, and to distribute the 'cost of living', the noise, evenly among everyone...". This observation applies to optical CDMA, also. However, certain restrictions and "rules of thumb" emerge when one considers the physical implementation of optical CDMA. In this talk, we will describe our initiation to and enchantment with optical CDMA in the form of pseudo-orthogonal (PSO) code sequences, which we call "linear" codes. These codes are sometimes referred to as "spanning rulers" or "optimum Golomb rulers". Our subsequent disenchantment due to the bandwidth expansion required to implement the linear codes led us to the technique of folding them into matrices and permuting the matrices to form a code set of higher cardinality, which preserves the PSO properties. We will discuss the basis of the coding, spreadsheet analyses for quickly determining the physical implications of the codes or their implementation, and solutions to the nonlinear Schroedinger equation to explore the fidelity of propagation of the wavelength/time codes over real fiber optic links. The links studied by simulation are longer than 200 km, incorporate segments of SMF-28 and Corning LEAF fiber, and include optical amplifiers (EDFAs). Finally, we will discuss the results of current field experiments (>400 km) to determine the validity of the computer simulations. The objective is to establish "rules of thumb" to simplify the design and analysis of optical CDMA and to define future applications. |
| Biography: Antonio J. Mendez received his B.A. degree, divisional major, with a minor in mathematics, and the Ph.D. degree in physics from the University of Southern California (USC), Los Angeles, in 1960 and 1968, respectively. He has extensive experience in industrial R&D, having been involved in Advanced Programs at the Northrop Corporation, the Martin Marietta Corporation (now part of Lockheed-Martin Corporation), and the Electro-Optical and Data Systems Group of the Hughes Aircraft Company (now Raytheon Defense Systems). He formed Mendez R&D Associates in 1987 to pursue new directions in advance optical communications. Dr. Mendez is a member of the Phi Beta Kappa honorary society, the Association for Computing Machinery (ACM), the Optical Society of America (OSA), and SPIE. He is Past-Chair of the IEEE/LEOS, Los Angeles Chapter; Past-Chair of the IEEE/Santa Monica Bay Station; and Past-Chair of the IEEE/USA Anti-Discrimination and Career Equality Committee of the IEEE/US Activities Board Career Activities Council. |
| Time and Location: Date: Monday, September 24 Time: 11:00 a.m. University of Toronto, Roseburgh building, room 211. The Roseburgh building is located at 4 Taddle Creek Road. For more information contact Emanuel Istrate, istrate@ecf.utoronto.ca. |
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