Self-routing demonstration of a 320-Gbit/s packet switch prototype using wavelength routing techniques

Habara, K.; Sanjo, Hiroaki; Nishizawa, Hideki; Ogawa, I.; Suzaki, Y.

doi:10.1109/cleo.2000.906979

Cited by 7 publications

(18 citation statements)

References 5 publications

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“…Several optical buffer architectures have been proposed. These are categorized into three: a single-stage buffer architecture, in which a number of FDLs are allocated in parallel and a packet goes through one of them [8,2,9], a multi-stage buffer architecture, in which a number of single-stage buffers are connected in tandem [8,6,9,10], and a recursive buffer architecture, in which a FDL may be used for a packet several times by loopback interconnection [8,9,4]. Generally speaking, a multistage buffer and a recursive buffer have internal blocking without the used of a complex architecture and management (e.g., [10]) while they have a smaller number of FDLs compared to a single-stage buffer.…”

Section: Optical Buffer Architecture For Buffer Management Of Pbsandpbsomentioning

confidence: 99%

“…The buffer manager handles at most N packets within timeT. Wavelength conversion may be used to increase the size of the buffer [6,2] and replace the optical space switch with AWG (Arrayed Waveguide Grating) [8] .…”

Section: Optical Buffer Architecture For Buffer Management Of Pbsandpbsomentioning

confidence: 99%

“…Several researchers investigated photonic packet switches/routers (e.g., [8,6,2,15,11]), and some have introduced an optical buffer [8,6,2]. The functions of packet switches are roughly divided into the following five functions: (1) address/label lookup (i.e., forwarding), (2) switching, (3) buffer management, (4) buffering, and (5) routing functions.…”

Section: Introductionmentioning

confidence: 99%

“…The existing optical buffer consists of multiple FDLs, each of which has a different length [8,6,2,9,4,10]. These buffers can avoid internal collision of packets with the help of buffer management that assigns each packet to a different FDL.…”

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confidence: 99%

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Prioritized Buffer Management in Photonic Packet Switches for Diffserv Assured Forwarding

Harai¹,

Murata

2003

Next Generation Optical Network Design and Modelling

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We study photonic packet switching architecture that enables a high node throughput and provides priority services in DiffServ (Differentiated Services). As we will show in this paper, a photonic packet switch can be equipped with an ultrahigh-speed address-lookup capability in the optical domain. However, the optical buffer must be managed in the electrical domain. In this paper, we investigate buffer management schemes with less complexity, such that the capability of the ultra-high-speed packet forwarding can be sustained in the photonic switch. We propose an implementation method for PBS (Partial Buffer Sharing) that provides DiffServ AF (Assured Forwarding). We show that PBS is applicable to single-stage optical buffer. Also, we propose a new buffer management method, called PBSO (PBS with Overwriting), which is applicable to broadcast-andselect-based single-stage optical buffer. PBSO is also applicable to the current space-switch-based single-stage optical buffer with an addition of a few optical components. The PBS and PBSO methods are based on a single queue and their complexities are 0(1) and O{p ), respectively, where pis the number oflevels of drop precedence. Through simulation study, we show that both methods provide different levels of drop precedence for DiffServ AF, and that PBSO improves buffer utilization and the packet loss probability of both drop-level packets.Keywords: Photonic packet switch, buffer management, partial buffer sharing with overwriting, single queue, DiffServ, level of drop precedence

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Section: Optical Buffer Architecture For Buffer Management Of Pbsandpbsomentioning

confidence: 99%

Section: Optical Buffer Architecture For Buffer Management Of Pbsandpbsomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Prioritized Buffer Management in Photonic Packet Switches for Diffserv Assured Forwarding

Harai¹,

Murata

2003

Next Generation Optical Network Design and Modelling

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“…Address lookup is expected to be operated optically. Address lookup [2,3], switching [4,5], and buffering [6,5] can be handled in the optical domain. In contrast, buffer management, in which the delay in the optical buffer is determined, still requires electronic processing since optical logic and optical RAM (random access memory) are still impractical.…”

Section: Introductionmentioning

confidence: 99%

<title>Performance analysis of prioritized buffer management in photonic packet switches for DiffServ assured forwarding</title>

Harai¹,

Murata

2002

SPIE Proceedings

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We investigated the photonic packet switch architecture that enables a high node throughput and provides priority services. Previously, we proposed PBSO (partial buffer sharing with overwriting) method that enables prioritized buffer management to control an optical buffer [1]. The PBSO method is based on a single queue and its complexity is O(p), where p is the number of priority classes. PBSO can be used to provide different levels of drop precedence in DiffServ (Differentiated Services) Assured Forwarding. In this paper, we propose an analytical method of PBSO where p = 2 . We assess the accuracy of the analytic method. We show that PBSO improves the packet loss probability in each priority class more than the existing PBS (partial buffer sharing) does, and that it can be used for prioritized buffer management of an optical buffer. PBSO is especially effective when the arrival rate of higher priority class packets is much lower than that of lower priority class packets. In this case, PBSO dramatically improves the performance of higher priority class packets while the degradation in the performance of lower priority class packets is small. In PBSO, a larger number of higher priority class packets can be accepted at a given packet loss probability than in PBS or non-priority method.

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Multi-Stage Fiber Delay Line Buffer in Photonic Packet Switch for Asynchronously Arriving Variable-Length Packets

OGASHIWA¹

2005

IEICE Transactions on Communications

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We study photonic packet switches to support asynchronously arriving variable-length packets. A scheduler for contention resolution is operated in electrical domain even when data street of the buffer is provided in optical domain. In this scheme, the scheduler may be a bottleneck. To compensate the gap of high-speed optical transmission and slow-speed electronic processing, we propose a multi-stage fiber delay line (FDL) buffer architecture that forms a tree structure in which each node has a block of FDLs and a scheduler. This is especially useful for output-buffer switches in which scheduling complexity is proportional to the number of ports of the packet switch. Through a newly-developed approximate analytical method, we show the optimum unit length of the fiber delay lines to decrease packet loss probability. We also show the sufficient number of FDLs in the two-stage buffer.

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Self-routing demonstration of a 320-Gbit/s packet switch prototype using wavelength routing techniques

Cited by 7 publications

References 5 publications

Prioritized Buffer Management in Photonic Packet Switches for Diffserv Assured Forwarding

Prioritized Buffer Management in Photonic Packet Switches for Diffserv Assured Forwarding

<title>Performance analysis of prioritized buffer management in photonic packet switches for DiffServ assured forwarding</title>

Multi-Stage Fiber Delay Line Buffer in Photonic Packet Switch for Asynchronously Arriving Variable-Length Packets

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