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In this paper we address future grid systems built in a large scale interconnected wavelength switched optical network. According to users needs on high performance distributed computation, a group of dedicated lightpaths among the distributed computer resources forming the users on-demand optical grid networks are established dynamically. To construct optical grid networks automatically in a distributed fashion, we propose an optical grid network infrastructure to provide one integrated and self-contained grid service. We present a possible design of the optical grid network infrastructure and verify this design through experiments on a developed prototype and a metropolitan-scale optical-fibre test-bed.