Carrier Density and Optical Power of Laser Diodes for DC Currents

OCSim Modules

Modern Fiber Optic Communication Systems Simulations with Advanced Level Matlab Modules

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Module 3a

 

Lasers

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Carrier Density and Optical Power of Laser Diodes for DC Currents

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(1) Use the Existing Modules / Components for Your Research & Development.
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Main Module

laser_diode.m

The laser rate equations are numerically solved to obtain the photon density and carrier density. The first and second columns of the output are photon density and carrier density, respectively.


This Module calls the following Sub Module / Component:

(1) rate_eqn.m
Solves the laser rate equations.


Explore Further this Module:

3a.1 Choose a drive current I_{0} to be more than the threshold current. Plot the carrier density as a function of time. Under stead state conditions (large T), compare the carrier density with the threshold carrier density N_{th}. Provide explanation. Compare the power generated under steady state conditions with the analytical calculations.

3a.2 Choose a drive current that is less than the threshold current. Plot the power generated as a function of time. Is the generated power significant? Explain your findings.

3a.3 Change the drive current from I_{0} from I_{th} (threshold current) to 2 I_{th} with a suitable increment and plot the steady state power generated (at tfinal) as a function of the drive current. This curve is known as P-I curve.

Note: At larger drive currents, tolerances for ode45 may have to be changed

 

 

Selected Simulated Results Using this Module

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Electron Density Vs. Time

 

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Optical Power Density Vs. Time

 

 

 

 

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