Bell Laboratories Work Values

Daily Duties at Bell Laboratories:

Optoelectronics Development, Murray Hill, NJ (1999-2001) • Optimized the design of the Avalanche Photo Diode (APD) and PIN photo detectors by developing algorithms in Visual C++ using .NET, for Automatic Wafer and Diffusion Probing System. • Improved the design of RF Bandwidth of 2.5 and 10 GHz APD by measuring its DC and RF characteristics, using S parameters, and implementing statistical data analysis. • Simulated the device characteristics of the APD and PIN Photo Detectors using MEDICI and FDM in C++. Wireless Hardware Development, Whippany, NJ (1994-1999) • Designed the Global System Mobile (GSM) Speech Trans-coding, Time Alignment, and Frame Synchronization to M or A interface of the Speech Transcoder Unit by developing codes to send Uplink (Client) and Downlink (Server) test vectors. Results were validated with Vector Transmission Templates in C. • Designed and developed the AT&T DSP 1620 code for Time Alignment of GSM and 3G applications. • Obtained the Community European (CE) Marking by evaluating, designing and EESOF Simulation of the Power Distribution, Electro-Magnetic Compatibility (EMC), and Testing of the Speech Transcoder Frame. • Optimized Slow and Fast Frequency Hopping and Kalman-Bucy Filter Estimation in MATLAB and SIMULINK with Random Monte-Carlo input signals. Homer Ghaffari Page 2 • Upgraded the design of the Time Division Multiple Access (TDMA) Base Station Hardware including Cavity Combiners, Enhanced Digital Radio Unit (EDRU), DRU, and TDMA Transmit Unit boards by implementation of Basic Macros and LABVIEW for automated RF Testing. • Improved the design of a variety of base stations, including the Cellular Series II Classic, M, MM, and Personal Communication System (PCS), Code Division Multiple Access (CDMA) frames. Optical Physics Research, Murray Hill, NJ (1992-1994) • Optimized thermal characteristics of laser diodes to avoid overheating in Continuous Wave (CW) operation at room temperature by developing Finite-Element Models (FEM) Simulations in ANSYS. Provided guidelines for future fabrication of these polymer and semiconductor lasers. • Device modeled the spontaneous and stimulated emission in Whispering Gallery Mode lasers to identify their absorption and gain factors by developing device-simulation codes. Several numerical methods for the solution of nonlinear set of rate equations of this III-V compound, including the Newton-Raphson and Least Square Methods, were developed in C++ under UNIX and results were confirmed by experiment. • Automated collection of data, and Image Processing of several optical instrumentations by developing functions and interface libraries in C and LABVIEW. • Improved the reliability of the AT&T Smart Cards by tenfold with applying numerical parametric studies in FEM for analysis of mechanical and thermal stresses on devices. Lightwave Electro-Optical Design, Whippany, NJ (1989-1992) • Designed and automated an Isothermal-Aging System, which maintained constant heating and cooling temperature and acquired DC and RF measurements from 50 optical receivers at designated times. Evaluated the expected lifetime, degradation, failure density, cumulative failure, survivor functions and hazard rates of the aging devices, and displayed statistical distributions by applying S functions. • Investigated nonlinear vibratory effect, chaotic motion, and instability on semiconductor devices, by implementing the Runge-Kutta integration method, Fourier Transform, and Markovian techniques using C++. • Led the Design, Fabrication, Testing, Reliability, and Transfer of Technology to Manufacturing of an Underwater Lightwave System Optical Receiver. Further, implemented its Qualification in accordance to the MIL-Std 883, and TelCordia Specifications. Advanced VLSI Packaging (AVP) Design and Development, Murray Hill, NJ (1985-1989) • Characterized several semiconductor packages showing temperature profiles, thermal stresses, and heat fluxes using Finite Element Methods of ANSYS and NASTRAN. • Analyzed semiconductors using Finite-Difference, Finite-Volume, and Boundary-Element schemes in C. • Improved the cooling of AVP semiconductor packages by various methods of forced air, liquid immersion, and cryogenics with instrumentation and automation in HP Basic for characterization of their performance. • Optimized the design of Integrated-Photonics Transceiver circuits by establishing automatic testing using several optical instrumentations, IEEE488 board, PC, and developing Software in C and Shell programming. • Implemented robotic assembly of VLSI packages by coding in Automated-Control Language (ACL). • Designed the wire-bonding technique on packages by statistical analysis and provided comparative mean, variance, regression, and confidence levels by coding modular programs in C under UNIX. • Verified design of packages by developing the Graphic Editor in C for a Computer Aided Design System. Computer-Aided Design and Image-Processing Systems, Murray Hill, NJ (1984-1985) • Supplemented the Checksum routine to an existing I/O processor by coding in C Structured Programming. • Increased speed by factor of 4, and reduced data storage by factor of 2, in the GRED package, by coding parsers and I/O routines in Compressed-Binary Format in C under UNIX. • Designed and implemented database in Intelligent-Database Machine (IDM), using Intelligent-Database Language (IDL), embedded SQL queries embedded in C, and Freeform screens for Image Recognition related to demographical data. Further, utilized the IDL preprocessor, by coding programs to design and manage database. • Installed IDM device drivers on VAX using UNIX internals and applying configuration methods. • Developed CAD programs in C using the core and GSX graphic extension.

What they like about Bell Laboratories:

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Tags

Communication Systems, Signal and Image Processing, Analysis and Simulations, Control and Navigation Systems, Control and Navigation Systems, Detection, Tracking and Estimation Method, Detection, Tracking and Estimation Method, Energy and Thermal Systems, Energy and Thermal Systems

Skills

P&L responsibilities, Presentation, Technology Solutions, Sales Support, Software Implementation, Requirements Analysis & Specification, Leadership , PLATFORMS: UNIX, VxWorks, Windows, Visual Studio, .NET, and LabWindow., LANGUAGES: C, C++, Java, C#, ASP, WPF, VB, FORTRAN, LABVIEW, SQL, Script, UML, XML, and VHDL., PACKAGES: MATLAB, SIMULINK, SPW, EESOF, SPICE, MEDICI, ANSYS, PATRAN, NASTRAN, ENOVIA, CATIA, IVT, EMITS, HFSS, MATHCAD, MATHEMATICA, S, CAD, IDL, DOORS, and EXCEL.

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