In this paper, we propose a novel hybrid optical switching scheme called HyLABS (Hybrid Lightpath and Burst
Switching), which has two implementing schemes including C-HyLABS and I-HyLABS. Both of the two schemes
of HyLABS can control the two optical switching techniques OCS and OBS together, and adopt the former for
normal traffic and the later for overloading traffic. Thus HyLABS can efficiently adapt network traffic fluctuations
and achieve good performance. Then we evaluate the performance of TCP over HyLABS networks and find an issue
called False Fast Retransmit (FFR) that can degrade TCP's throughput. Finally, we propose two algorithms
including DRDA and EN-DRDA to address the issue of FFR. Simulation results show that both of the two
algorithms can actually improve TCP's throughput performance over HyLABS networks.