In many models of perfect quantum teleportation, maximal entangled states are postulated between Alice and Bob. Recently, Kossakowski and Ohya proposed a new scheme of perfect teleportation where a non-maximal entangled state is used. In this paper, we introduce a concrete teleportation model of K-O scheme, called a m-level teleportation. A non-maximal entangled state in this model is realizable in optical techniques. Moreover, we propose another teleportation model designed by using a mathematical formalism of K-O theory. In the second model, a new operation is added to a conventional teleportation process, which is called a filtering and implemented before Alice's measurement. We show effects of the filtering for success probabilities of teleportation.
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