Recently, optical burst switching (OBS), which represents a balance between circuit and packet switching, has opened up
some exciting new dimensions in optical networking. Burstification is an important process in OBS networks. Due to the
burstification, there are two opposite effects on TCP throughput in OBS networks: delay penalty and amplification
effects. In this paper these two effects are experimentally investigated simultaneously for the first time based on an OBS
mesh network testbed and some valuable experimental results are achieved. Experimental results show that when BTT is
less than 1.5ms, and BLT is in the BLT window, the positive effect on TCP throughput is dominant. On the other hand,
if BTT is larger than 1.5ms, the BLT window will be closed, thus the delay penalty will become the dominant effect in
the OBS networks.