A construction of shared optical buffer queue with switched delay lines

In this paper, we focus on the feedback construction of FIFO shared optical buffer queue from bufferless switch and fiber delay lines. The construction consists of an (M+2)times(M+2) crossbar switch and M fiber delay lines with delay d₁, d₂, ... , d_M which are connected from M outputs of the switch fabric to M inputs. We show that, when setting d_i = min(M + 1 - i, i), i = 1, ... , M, such a construction can work as a 1-to-2 shared buffer queue.