Pulse-shaping to reduce the chirping effects of DFB laser diodes and pulse broadening
Publisher
The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
In this thesis, a computer simulation has been done to evaluate the wavelength chirping and pulse broadening effects induced by the direct intensity modulation using Distributed Feedback (DFB) laser diodes. In the simulation, a DFB laser diode is driven by either square wave current pulses or pulses with a small current Step in the Leading Edge (SLE). A comparative study is performed to justify the effectiveness of using SLE waves in modulation to reduce wavelength chirping and pulse broadening. Numerical results from the single-mode rate equations show that the SLE wave modulation reduces the wavelength chirping and pulse broadening by a factor of 2. The optimal SLE pulse has a prepulse duration of 0.15 ns and a prepulse current level of 70.0 mA.Type
textThesis-Reproduction (electronic)