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Optical burst switching (OBS) is becoming an interesting technology for the optical Internet, since it does not need optical buffers like optical packet switching (OPS), and is capable of a better performance than optical circuit switching (OCS). Although OBS has been recently an object of intense research, it still raises a number of important questions. Due to the high costs of an OBS network infrastructure, simulators are a good choice for predicting the behavior of this kind of networks. In this paper, we describe the proposal, implementation and validation of a simulator for OBS networks. The simulator, named OBSim, mimics the behavior of OBS networks in an object-oriented approach.