Banyan switch

About: Banyan switch is a research topic. Over the lifetime, 242 publications have been published within this topic receiving 3452 citations.

High-performance silicon photonic tri-state switch based on balanced nested Mach-Zehnder interferometer.

Abstract: This work proposes a novel silicon photonic tri-state (cross/bar/blocking) switch, featuring high-speed switching, broadband operation, and crosstalk-free performance. The switch is designed based on a 2 × 2 balanced nested Mach-Zehnder interferometer structure with carrier injection phase tuning. As compared to silicon photonic dual-state (cross/bar) switches based on Mach-Zehnder interferometers with carrier injection phase tuning, the proposed switch not only has better performance in cross/bar switching but also provides an extra blocking state. The unique blocking state has a great advantage in applications of N × N switch fabrics, where idle switching elements in the fabrics can be configured to the blocking state for crosstalk suppression. According to our numerical experiments on a fully loaded 8 × 8 dilated Banyan switch fabric, the worst output crosstalk of the 8 × 8 switch can be dramatically suppressed by more than 50 dB, by assigning the blocking state to idle switching elements in the fabric. The results of this work can extend the functionality of silicon photonic switches and significantly improve the performance of on-chip N × N photonic switching technologies.

Tandem banyan switching fabric with dilation

Abstract: The recently proposed fast packet switch for BISDN, called the tandem banyan switching fabric, achieves the performance of an output-buffered switch. To attain a low packet loss rate, however, it may be necessary to use many banyan networks connected in series. In the Letter it is shown that the number of banyan networks can be substantially reduced by using dilated banyans to attain the same performance.

Scalable DWDM network switch architecture with wavelength tunable sources

Abstract: The present invention provides for a DWDM network switch connecting N input fibers and N output fibers, each optical fiber carrying M wavelength channels. The network switch has a control unit (17) a plurality of demultiplexers (18_1-18_N), connected to the input output optical fibers, a plurality of tunable channel units (12_11-12_NM), a switch fabric (13_1-13_M), and a plurality of combiners (14_1-14_N) connected to the output fibers. The demultiplexers (18_1-18_N) and tunable channel units (12_11-12_NM) provide the wavelength routing function and the switch fabric, which has MxN2 switch points, switches signals from the input fiber to output fiber so that the switch can switch signals from the wavelength channel to another and from one input fiber to one or more output fibers of the DWDM network. The switch fabric is formed from a plurality of switch modules, one module for each incoming wavelength channel. The modules are also formed from partitionable arrangements of switch elements and combiners so that the switch fabric and switch can be scaled up and reconfigured on an 'as needed' basis.

The fat banyan ATM switch

Abstract: A strategy for fully utilizing switch resources, namely the buffers and links in a banyan network is proposed. A new switch model called the fat-banyan switch is introduced with the objective of achieving high performance at minimal cost. The fat-banyan switch model is a unifying model for the design and analysis of dilated banyan switches. The dilated banyan network forms a special case of the fat-banyan model. By keeping the number of input and output links of a switching element to be variable, the fat-banyan switch achieves a lower order of complexity than the dilated banyan. Further the fat-banyan switch is superior to the buffered-banyan switch in terms of reduced delay and higher throughput. The performance of the fat-banyan under independent uniform traffic pattern is analyzed.

SFQ standard cell-based circuit design of an internal link speeded-up Batcher-Banyan packet switch

Abstract: We are developing a single-flux-quantum (SFQ) packet switch for over 1-Tb/s switching systems. Investigation of several switch topologies leads us to select the Batcher-Banyan packet switch because of its simplicity and regularity. The packet switch structure we propose consists of simple 2/spl times/2 unit switches each connected by speeded-up internal links. Numeric simulation showed that the speeded-up links greatly improved the throughput by resolving packet blocking, which is a major drawback of the Banyan switch. High throughput compatible to a crossbar switch was attained by using links whose speed was quadrupled. Moreover, the throughput did not decrease even though the number of input/output ports increased. Taking the speed of SFQ basic gates into account, the cycle time of the 2/spl times/2 unit switch reaches 25 ps, which is sufficient to achieve the 40-GHz operation. If unit switches are connected by quadrupled internal links, the Batcher-Banyan switch can accept the 10-Gb/s external input rate per channel. This indicates that the total throughput of a 128/spl times/128 switch exceeds 1 Tb/s. The unit switch was designed down to the SFQ gate level. To design a large SFQ circuit, we built several "standard" SFQ cells whose shape was square or rectangular with a unit width and height. Such shapes make it easier to place and connect a number of cells. We show some experimental results of testing SFQ standard cells and logic circuits.