Theoretical Analysis on Modulation Bandwidth for Distributed Reflector Laser with Quantum Wire Structures

Abstract

The rapidly growing information era has been augmented by a global network of optical fiber. By offering an enormous transmission bandwidth of about 10¹⁴ Hz and low signal attenuation, the low cost, glass-based single mode optical fiber provides an ideal transmission medium. Distributed Reflector (DR) laser consisting of a DFB ( distributed feed back) laser with high reflection DBR( distributed Bragg reflector) at the rear end is studied by considering wirelike active region. Modulation bandwidth of GaInAsP/InP laser has been analyzed. Optimum structure for large modulation bandwidth observed is the DR laser with Double Quantum wire stack, 140μm cavity length and 120nm wire width. The proposed structure also provides good static characteristics such as threshold current of 0.416mA and differential quantum efficiency of about 56%. In this study highest modulation bandwidth of 16 GHz has been realized theoretically.