Transport protocols let applications utilize the underlying network resources optimally. Existing transport protocols have limitations when they are used in new application domains and for new optical networking technologies. In our photonic testbeds, node-to-node bandwidth is usually at least 1 Gbps. If we use standard TCP, chances are that we can only utilize a small fraction of the underlying bandwidth. This means that we need to make up the gap between abundant network resources and hungry applications. This is why we are developing new transport protocols to streamline the entire system.