| Semiconductor optical amplifier (SOA) has small size, long life and low cost, simplemanufacturing process, easy integration and other advantages, which make it become a corecomponent in next generation optical network and optical fiber communication system. Andreflective semiconductor optical amplifier (RSOA) not only has large gain but it also hassimple structure and good output extinction ratio. Therefore RSOA owns certain advantagesand great market value.In order to promote the characteristics of RSOA, a novel scheme of two-section RSOAis proposed. Compared to common RSOA (single-electrode RSOA), the characteristics oftwo-section RSOA can be easily controlled to meet various application requirements byadjusting the injection current density of the two sections. In this dissertation, based onmulti-section model and spectrum segmentation model of RSOA, the gain, saturation powerand noise figure (NF) characteristics of two-section RSOA are investigated both theoreticallyand experimentally. The gain recovery time, strength of cross gain modulation (XGM)between different channels and part characteristics of XGM wavelength conversion based ontwo-section RSOA are studied theoretically. The research contents can be summarized asfollows:(1) The mechanism and measuring method of noise figure of SOA is introduced.According to features of two-section RSOA, the simulation model is set up on the basis ofmulti-section model and spectrum segmentation model.(2) The influences of current density ratio, the reflectivity of the reflective facet on thegain, saturation power and NF are measured and simulated. The experimental results provethe theoretical simulations.(3) The dynamic characteristics of two-section RSOA are investigated theoretically. Theresults show that gain recovery time and strength of XGM between different channels can beimproved with optimized current density ratio, cavity length ratio and reflectivity of thereflective facet. The performances of two-section RSOA and two-section traveling waveSOA are compared and the result shows that the former is better if the parameters areoptimized. |
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