On-chip optical isolators constitute an essential building block for photonic integrated circuits. Monolithic magnetooptical isolators on silicon, while featuring unique benefits such as scalable integration and processing, fully passive operation, large dynamic range, and simple device architecture, had been limited by their far inferior performances compared to their bulk counterparts. Here we discuss our recent work combining garnet material development and isolator device design innovation, which leads to a monolithic optical isolator with an unprecedented low insertion loss of 3 dB and an isolation ratio up to 40 dB. To further overcome the bandwidth and polarization limitations, we demonstrated broadband optical isolators capable of operating for both TM and TE modes. These results open up exciting opportunities for scalable integration of nonreciprocal optical devices with chip-scale photonic circuits.
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.
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