Analysis and Calculations
Output Wavelength
Based on Fig 9 and 10, the highest peak of the lasing spectrum, it is found at around 193.44THz, the laser has highest power output. This gives the lasing wavelength of the ECL design:
\(\lambda=\frac{c}{f}=\frac{\left(3\cdot10^8ms^{-1}\right)}{\left(193.44THz\right)}=1550.8nm\)
This confirms that the design will meet the requirement of an output wavelength of 1550 ± 1nm.
Wall-Plug Efficiency (WPE)
To calculate the wall-plug efficiency, an assumption that the device will run on 1.5V D.C. is made. From Fig. 6., we find that at 100mA, the power output is 14mW. Hence we can calculate WPE:
\(WPE=\frac{\left(P_{out}\right)}{\left(I\cdot V\right)}=\frac{0.014}{1.5\cdot0.01}\cdot100\%=93.3\%\)