First System Demonstration of Hitless λ-Tuning Sequence for Dynamic Wavelength Allocation in WDM/TDM-PON

Kaneko, Shigeo; Yoshida, Tomoaki; Furusawa, Satoshi; Sarashina, Masahiro; Tamai, Hiroshi; Suzuki, Atsushi; Mukojima, Toshiaki; Kimura, Shunji; Yoshimoto, Naoto

doi:10.1364/ofc.2014.w3g.6

Cited by 21 publications

(14 citation statements)

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“…Dynamic load balancing is a function that transfers some of the traffic load from heavily loaded OLT ports to less burdened OLT ports [8], [13], [14]. For each function, ONUs connect to a new OLT port by performing λ-tuning according to the λ-tuning directions from the OLT port to which ONUs are originally assigned [15]. The λ-tuning directions include a new wavelength and the start time of the λ-tuning.…”

Section: Issues Facing λ-Tuning Olt Protectionmentioning

confidence: 99%

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Reliable λ-Tuning OLT-Protection Method Based on Backup-Wavelength Pre-assignment and Discovery Process for Resilient WDM/TDM-PONs

Kaneko

Yoshida

Kimura

et al. 2015

J. Lightwave Technol.

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This paper proposes a novel wavelength-tuning (λ-tuning) optical line terminal (OLT) protection method for wavelength division multiplexing/time division multiplexing-passive optical networks (WDM/TDM-PONs). Since λ-tuning OLT protection achieves redundancy of OLT ports utilizing only the λ-tunability of optical network units (ONUs) that ONUs intrinsically have for colorless operation, no additional equipment such as redundant OLT ports or optical switches is necessary for the protection. The proposed method is based on backup wavelength pre-assignment and a discovery process. Since the backup wavelengths are pre-assigned, the proposed method shortens the service outage time and balances traffic loads among the active OLT ports after OLT protection. Therefore, the proposed method achieves high-level reliability cost-effectively. Through system demonstrations using media access control boards and λ-selective burst-mode transceivers for symmetric 40-Gb/s WDM/TDM-PONs, the validity of the proposal is examined based on the link-up time and throughput measurement for λ-tuning OLT-protection.Index Terms-Optical access network, optical access system, passive optical network (PON), passive optical network (PON) protection, wavelength division multiplexing/time division multiplexing-passive optical network (WDM/TDM-PON).

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Section: Issues Facing λ-Tuning Olt Protectionmentioning

confidence: 99%

“…Monitoring times Δt M OLT and Δt M ONU are set to 1 s, and N Th is set to 3 ONUs. Interval Δt D is set to 200 ms, which is the same value as that in [15]. The λ-tuning time, Δt λ , for the proposed method is varied at 100 ns, 20 ms, and 50 ms while that for the conventional method is fixed at 100 ns.…”

Section: B Sequence For λ-Tuning Olt Protectionmentioning

confidence: 99%

Reliable λ-Tuning OLT-Protection Method Based on Backup-Wavelength Pre-assignment and Discovery Process for Resilient WDM/TDM-PONs

Kaneko

Yoshida

Kimura

et al. 2015

J. Lightwave Technol.

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“…Fig. 3 illustrates the λ-tuning sequence proposed in [10]. The DWA cycle is defined as a period during which the wavelength assignments are unchanged.…”

Section: Hitless λ-Tuning Sequence For Dwamentioning

confidence: 99%

“…In Section II, system configurations of our λ-tunable WDM/TDM-PON and network functions based on DWA are described. The hitless λ-tuning sequence for DWA that we proposed in [10] is also given. Section III experimentally shows the feasibility of the λ-tuning sequence in advance of the dynamic load-balancing demonstration.…”

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confidence: 99%

Demonstration of Load-Balancing Operation Based on Hitless Dynamic Wavelength Allocation on Symmetric 40-Gbit/s λ-Tunable WDM/TDM-PON

Kaneko

Yoshida

Furusawa

et al. 2015

J. Lightwave Technol.

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This paper reports the world-first system-level demonstration of dynamic wavelength allocation (DWA) on a wavelength-tunable (λ-tunable) wavelength division multiplexing/time division multiplexing-passive optical network (WDM/TDM-PON). To achieve DWA, a DWA calculation is necessary that determines new optical network unit assignments to the optical line terminal ports according to the bandwidth demand. In addition, a wavelength-tuning (λ-tuning) sequence that induces no data-frame loss, i.e., a hitless λ-tuning sequence, is essential. First, we propose a bidirectional hitless λ-tuning sequence and investigate its feasibility using media access control boards that we developed for symmetric 40-Gbit/s λ-tunable WDM/TDM-PONs, which are also the world's first. Then, with a DWA calculation according to the downstream traffic loads, we show automatic dynamic load-balancing operation.Index Terms-Dynamic wavelength allocation (DWA), optical access network, optical access system, passive optical network (PON), wavelength division multiplexing/time division multiplexing-passive optical network (WDM/TDM-PON).

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“…Many studies focused on Dynamic Wavelength and Bandwidth Allocation (DWBA) schemes and protocols to either minimize the number of utilized wavelengths at the OLT to save energy [2], [3] or to hitlessly (i.e., avoiding frame loss) perform wavelength reconfiguration [4], [5]. Only recently, attention has been focused on DWBAs reducing penalties due to tuning time overhead.…”

Section: Introductionmentioning

confidence: 99%

Balancing the Impact of ONU Tuning Overhead in Reconfigurable TWDM-PONs: An FPGA-Based Evaluation

Kondepu

Valcarenghi

Castoldi

2014

2015 IEEE Global Communications Conference (GLOBECOM)

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In TWDM-PON, the utilization of tunable transceivers at the ONUs allows to dynamically reconfigure the OSU-ONU pairings to decrease, for example, the energy consumption at the OLT. However, if the utilized dynamic wavelength and bandwidth allocation (DWBA) does not take into account which ONUs are reallocated, the ONU tuning overhead can severely impact the average frame delay experienced by the tuning ONUs. The paper shows that, by alternating the ONUs that tune at each reconfiguration, the impact of ONU tuning overhead on average frame delay is fairly distributed among the ONUs.

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First System Demonstration of Hitless λ-Tuning Sequence for Dynamic Wavelength Allocation in WDM/TDM-PON

Cited by 21 publications

References 0 publications

Reliable λ-Tuning OLT-Protection Method Based on Backup-Wavelength Pre-assignment and Discovery Process for Resilient WDM/TDM-PONs

Reliable λ-Tuning OLT-Protection Method Based on Backup-Wavelength Pre-assignment and Discovery Process for Resilient WDM/TDM-PONs

Demonstration of Load-Balancing Operation Based on Hitless Dynamic Wavelength Allocation on Symmetric 40-Gbit/s λ-Tunable WDM/TDM-PON

Balancing the Impact of ONU Tuning Overhead in Reconfigurable TWDM-PONs: An FPGA-Based Evaluation

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