Investigating Blueshift in Peak of Modulation Response Curve at Quantum Well Laser Diode under Small-Signal Analysis

摘要

Modulation response of GaAs quantum well laser is analytically investigated at microwave to millimeterwave operative frequency region. Effect of gain compression parameter is taken into account for calculating the response function, and the work is centered around$1.55 mu mathrm{m}$. Confinement factor, mirror reflectivity and scattering effect inside the cavity are varied within practical limit to determine the blueshift of peak of response curve. Width of quantum well changes the wavelength of emitted wavelength, and that changes the modulation feature of the device. Threshold of all the tuning parameters are obtained after which the curve becomes flat, which is the limiting condition. Result will play key role in determining its efficiency as optical transmitter when coupled with optical fiber.