Transcript pres_grace1 - Ryerson University

Simulation and Analysis of
Single Mode
Semiconductor Laser
Course Project for EE8114
Electrical Engineering Dept.
Ryerson University
Grace FENG
Outline of My Work
Background Research on Fiber over
Radio
Close Study on the Simulink Based
Semiconductor Laser Diode Model
Repeat the Simulation Results from the
Previous Work
Build Simulation Functions to Analyze
the Optical Response of the Laser
Diode
Large-Signal Simulink Model
[ N (t )  N o ]  S (t ) N (t )
dN (t ) I (t )

 go

dt
q Va
1    S (t )
n
[ N (t )  N o ]  S (t ) S (t )   
dS (t )
   go


 N (t )
dt
1    S (t )
p
n
Rate Equation for Carrier Density and
Photon Density
S.A. Javro & S.M. Kang
“Transforming Tucker’s Linearized Laser Rate Equations to a Form that has a Single Solution Regime”
Journal of Lightwave Technology, 1995
Large-Signal Simulink Model, Cont.
Toby Schaer, Robert Rusnov, Stephen Eagle, Jay Jastrebski, Steven Albanese and Xavier Fernando
“A Dynamic Simulation Model for Semiconductor Laser Diodes”
CCECE 2003 – CCGEI 2003, Montreal, May/mai 2003
Operating Point
Pumping Current (mA)
Electron Density (m-3)
Photon Density (m-3)
10mA
1.9531 * 1018
1.9221 * 1013
15mA
1.9571* 1018
1.7141 * 1014
N 
Y  0 1. 
S 
Using the operating point values to
complete State Space Model, so
that to enable simulation around
operating point.
STATE SPACE MODEL
Small-Signal Simulink Model
Current Input
Rectanglur Pulse
Amplitude = 1mA
State Space Model
Implemented in Matlab
Photon Output
Pumping Current
(10mA, 15mA)
Pulse Response when bias point of I = 10mA
Pulse Response when bias point of I = 15mA
Sinusoidal Signal Response
Sinusoidal Signal Response, Cont.
Amplitude of Input Signal
Increased from 0.001mA to 1mA
Stepped by 0.001mA
Simulating System Response
100 Times
Sampling the Input
Amplitude each Time
Sampling the Output
Amplitude each Time
Plot the Relationship between
Input and Output Amplitude
Analyze the Result
Sinusoidal Signal Response, Cont.
Sample Phase Shift during Each Simulation
Plot the Relationship between Input Amplitude with Output Phase Shift
Conclusion
Small Input Eletronic Signal around Operating
Point of a Laser Diode could Lead to Linear
Optical Response in Terms of Amplitude
Phase Shift in Optical Response around
Operating Point Does Not Respond to Any
Changes in Input Electronic Signal