<p>This work studies absorption and dispersion in a double quantum dot (DQD) structure under a probe field and tunneling component where an analytical solution is considered for the susceptibility. Results show that increasing the probe power reduces absorption and dispersion. An electromagnetically induced transparency (EIT) window at removed absorption is created under an increasing probe field. This is important in strengthening the nonlinear absorption applications that prefer to occur at zero absorption. The dispersion is steeper with reduced tunneling, referring to reduced distortion of light propagation. Also, this work tries to engineer the structure by considering the transition between levels. While the susceptibility is grown by ~ 8 orders (a huge increment), the only change under increasing the transition parameter is the reducing width of the EIT window. The width of the EIT window is vital in slow-light applications.</p>