Find the optical gain at the threshold of a laser diode having the following parametricvalues $-\mathrm{R} 1=\mathrm{R} 2=0.32, \alpha=10 \mathrm{~cm}-1$ and $\mathrm{L}=500 \mu \mathrm{m}$.

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prajapatijaimin • 3.3k

• modified 3.0 years ago

optical fiber communication

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written 3.0 years ago by

prajapatijaimin • 3.3k

Solution:

Optical gain in the laser diode is given by,

$ \Gamma g_{\mathrm{th}}=10+\frac{1}{2 \times\left(500 \times 10^{-4}\right)} \ln \left(\frac{1}{0.32 \times 0.32}\right)\\ $

$ \Gamma g_{\text {th }}=33.7 \mathrm{~cm}^{-1}\\ $

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