Research On The Characteristics Of Face Reflectance And Pattern Conversion

With the rapid development of optical communication technology, all-optical networks face higher requirements. Optical communication technology is not only necessary to have a high-speed transmission speed, wide bandwidth capacity, but also to overcome the electronic bottleneck, low network throughput and other shortcomings. This paper mainly studies the performance of SOA by appropriately increasing facet reflectivity and NRZ to RZ format conversion based on QDSOA-MZI. The main contents of this paper are presented as follows:1. In Chapter 1, we briefly introduce the development status and trends in optical networks especially semiconductor optical amplifier. We also discuss the research of semiconductor optical amplifier significance.2. The existing SOA speed signal response model is improved, which considers the photon density, gain spectrum dispersion, amplified spontaneous emission noise(ASE), facet reflectivity and the influence of carrier concentration of refractive index. The rate equations and light field transfer equations are solved by utilizing the refined sectionalized method and the Runge-Kutta method. The theoretical model accelerates the efficiency of the program and guarantees the accuracy of the results more accurate.3. The performance of SOA is studied by appropriately increasing facet reflectivity. The results show that the gain recovery time decreases and the gain increases with the increase of facet reflectivity. However, the facet reflectivity isn’t more larger more better, the output power of ASE noise increases and the extinction ratio decreases with the increase of facet reflectivity. The gain increases up to a maximum with the increase of facet reflectivity.4. The output extinction of SOA is studied by appropriately increasing facet reflectivity. The results show that the output extinction decreases with increase of the probe power, when pump power is constant. The output extinction increases with increase of pump power, when probe power is constant. The extinction ratio decreases with the increase of facet reflectivity. The output extinction increases with increase of injection current. Then, this paper studies the output chirp of SOA. The results show that the output chirp decreases with the increase of input power. The positive chirp decreases and negative chirp increases with the increase of pump power, when probe power is constant. The change of positive chirp is lager than negative chirp. The output chirp increases with the increase of injection current.5. The NRZ to RZ format conversion is studied based on QDSOA-MZI using the refined sectionalized method and considering the effect of ASE. The results show that the average power increases with the increase of pump power, when probe power and linewidth-enhancement factor is constant. The average power increases with the decrease of current density, when pump power is constant. The Q factor decreases up to a minimum and then increases with increase of pump power, when current density is constant. Under different linewidth- enhancement factor conditions, the Q factor has obvious change with increase of pump power. The Q factor decreases with increase of probe power, when pump power is constant. In high-speed format conversion, The output Q factor increases with decrease of 21?.But 21? isn’t the smaller the better, we need to select according to actual requirements.