Semiconductor Optical Amplifiers: Understanding and Modeling - PowerPoint PPT Presentation

Semiconductor Optical Amplifiers: Understanding and Modeling Electron- Photon Interaction Name: Muhammad Farhan Abbasi Lab: OCPN Mentor: Vikrant Lal Advisor: Prof. Daniel J. Blumenthal Funding: DARPA – Chip Scale WDM Program: INSET, UCSB, Santa Barbara College: Mission College, Santa Clara Transfer: UCSC, Santa Cruz (Fall 2003) Major: Computer Science

Overview • Background of Fiber Optic Networks • Significance of SOA’s in Wavelength Converters • My Contribution in the Project : Simulations and Lab Experiments • Future Applications • Summary and Acknowledgement

Semiconductor Optical Amplifiers: Understanding and Modeling Electron- Photon Interaction • Fiber Optic Technology and The Present Internet • Wavelength Division Multiplexing (WDM) • Fundamental Components of WDM • Semiconductor Optical Amplifiers (SOA) – Building Blocks of the Wavelength Converter • The Need of a Single Chip Integrated Wavelength Converter

The Objective LASER Signal In • Significance of an SOA in Wavelength Converters • Understanding and Modeling an SOA to improve device design Wavelength Signal Out Converter SOA

Part I : My Contribution in the Project Coded a Simulation Regarding SOA’s in C Language Reference Book : “Numerical Recipes in C” by Press, William H. et. all Stage I : � Reading Binary Files � Computing Root of a Non-Linear Equation � Solving Ordinary Differential Equation using Runge-Kutta method Stage II : Integrating Smaller Parts to Formulate Simulation � � Running Simulation on Test Data Stage III : Testing Simulation for Speed and Performance � � Comparing Results with Existing Simulation

Gain, Input Power, & Applied Current Gain vs. input Power and Current 3.5 • As the Input Power I = 100mA increases, Gain 3 Decreases (Why?) 2.5 [Incoming Photons will I = 60mA take away more Gain (dB ) 2 electrons from conduction band, 1.5 hence, decreasing 1 electron density] • Gain curve drops 0.5 much faster with 0 higher Input Current -0.5 -60 -50 -40 -30 -20 -10 0 10 20 Input Power (dBm) Data Plot Provided by Vikrant Lal, OCPN, UCSB

Part II : My Contribution in the Project Lab Experiments with SOA’s Current Supply SOA PC EDFA Attenuator Spectrum Laser TE Cooler Analyzer Gain vs Input Power & Current(100mA) Gain vs Input Power & Current (150mA) -19.0 -17.0 -19.5 -17.5 Gain (dBm) -20.0 Gain (dBm) -18.0 -20.5 -18.5 -21.0 -19.0 -21.5 -19.5 -22.0 -20.0 -15 -10 -5 0 5 -15 -10 -5 0 5 Input Power (dBm) Input Power (dBm)

Future Applications • This simulation will be helpful in improving the structure of the existing wavelength converter • Understanding the working of SOAs in combinations would be easier with this simulator • Various designs of wavelength converters and SOAs can be investigated in broader detail

Summary • Present fiber optic networks will improve their performance by using such devices that overcome electronic speed • Semiconductor optical amplifiers play a vital role in fiber optic networks • Simulations are important tools for understanding semiconductor optical amplifiers and related devices like wavelength converters

Acknowledgement I would like to thank • University of California, Santa Barbara • INSET • Prof. Daniel J. Blumenthal & Vikrant Lal of the Department of Electrical & Computer Engineering & the OCPN team