We have developed a new type of ultra-high-speed optical line exchange equipment called the optical router core subsystem, which incorporates ultra-highspeed optical switching devices. This equipment offers ultra-high-speed bidirectional line exchange, enabling independent operation of optical modulation formats and bit rates. We have successfully demonstrated operation of this equipment in 43-Gbps DQPSK (Differential Quadrature Phase-Shift Keying), DPSK (Differential Phase-Shift Keying), and 160-Gbps RZ (Return to Zero) modulation formats without signal deterioration. This optical router core subsystem is expected to be applied to high-speed line switching in GMPLS (Generalized Multi-Protocol Label Switching), burst switches in optical networks, and interconnections of supercomputer nodes networks.
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