부산대학교 도서관

We propose a crosstalk (XT)-aware wavelength ( $\lambda $ )-detuning scheme to overcome the non-optimal in-band XT limiting all-to-all optical interconnects based on sub-optimal arrayed waveguide grating routers (AWGR). Experimental validation is demonstrated employing an $8 \times 8$ O-band cyclic Si-AWGR with 10 nm channel spacing and a 5.5 nm channel bandwidth, where the in-band XT limits the simultaneous use of the same $\lambda $ in only 2 out of the 8 possible AWGR I/O routing scenarios, yielding a 10 −7 error-floor when >3 channels at the same $\lambda $ are launched. We present experimentally an $8 \times 25$ Gb/s $\lambda $ -switched interconnect exploiting slightly detuned $\lambda $ s around the central $\lambda $ for realizing all 8 possible I/O routing scenarios, enabling an error-free all-to-all interconnect even for sub-optimal AWGRs. Error-free simultaneous transmission via the AWGR of all 8 channels using $4\lambda \text{s}$ and a $\lambda $ utilization factor 2 is shown, with a max. power penalty of 4.64 dB at 10 −9 error-rate.