Demonstration of a Variable Optical Delay for a Recirculating Buffer by Using All-Optical Signal Processing

Abstract

Abstract-We demonstrate a variable optical delay by using a recirculating loop that is controlled by all-optical signal processing technology. This concept can be utilized in all-optical recirculating buffers. The variable optical delay is realized by using an optical threshold function and a wavelength converter. We show that in case of packet contention, one optical packet is recirculated four times in the loop and when the contention disappears, the packet is routed out of the optical loop.Index Terms-Buffer memories, optical fiber communication, optical fiber delay lines, packet switching.

Application of Brillouin-Based Continuously Tunable Optical Delay Line to Contention Resolution Between Asynchronous Optical Packets

“…In the experimental demonstration described in the previous sections, the packets' priority has been pre-assigned to a specific input port of the node, similarly to several previously reported contention resolution experiments (e.g., [15]- [17]). However, for increased node functionality and extended network flexibility, the possibility of handling priority regardless of the specific packet input port would be desirable.…”

“…Contention at a network node occurs when two or more packets at the same wavelength compete for the same switch output port within an overlapping interval of time. Several all-optical approaches for solving contentions have been investigated in the past years [15]- [20]. Contention between packets can be solved in the optical domain by exploiting optical buffering, or wavelength conversion, or space deflection [21].…”

A New All-Optical Switching Node Including Virtual Memory and Synchronizer

“…However, its implementation should pay attention to its response time, since it can affect the system performances. ii) Multiwavelength laser source implementations Several technologies can be used to provide a wavelength generator for the control unit [11,31]. Among the most important technologies, one can distinguish two components; the optical flip-flop memory and the laser neural network.…”

“…Others varieties of architectures have been proposed in the literature for the design of virtual memory based on re-circulating loop. For instance, in [11], authors presented a variable delay line using all-optical signal processing without describing its control process. Moreover, the presented architecture offers a fixed number of delay values.…”

Design and analysis of optical packet switching systems with multicast capability

“…The optical buffer can provide a buffering time equalling to the multiple of a packet duration with a single fiber delay line by circulating the optical packet in the delay line loop. Because of this advantage, the recirculating-type optical buffers have been attracting much attention of research[50,51,[72][73][74][75][76]. However, the ASE noise induced by the optical amplifier will accumulate and substantially degrade the optical signal, which would limit the number of circulations of the optical signal in the buffer[77].…”