The Effects of Strained Multiple Quantum Well on the Chirped DFB-SOA All Optical Flip-Flop

Document Type : Research Paper


1 Department of Electrical Engineering, Marvdasht branch, Islamic Azad University, Marvdasht, I. R. Iran.

2 Advanced Device Simulation Lab, Electrical and Computer Engineering Department, Tarbiat Modares University, I. R. Iran

3 Electrical Engineering Department, Shiraz University, Shiraz, I. R. Iran

4 Iran Telecommunication Research Center, Tehran, I. R. Iran


In this paper, based on the coupled-mode and carrier rate equations, a dynamic model and numerical analysis of a multi quantum well (MQW) chirped distributed feedback semiconductor optical amplifier (DFB-SOA)  all-optical flip-flop is precisely derived. We have analyzed the effects of strains of QW and MQW and cross phase modulation (XPM) on the dynamic response, and rise and fall times of the DFB-SOA all optical flip flop. We have shown that strained MQW active region under an optimized condition into a DFB-SOA with chirped grating can improve the switching ON speed limitation in the abovementioned device, significantly while the fall time is increased. The values of the rise times for such an all optical flip-flop, are obtained in an optimized condition, areas tr=255ps.