An All-Optical Access–Metro Interface for Hybrid WDM/TDM PON Based on OBS

Segarra, Josep; Sales, Vicent; Prat, Josep

doi:10.1109/jlt.2007.891175

Cited by 30 publications

(14 citation statements)

References 46 publications

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“…Another important avenue is to examine the impact of the DBA design dimensions on delay variations and to explore mechanisms that jointly reduce mean delay as well as delay variations [39]- [41]. Moreover, the internetworking of EPON access networks, which were considered in this study in isolation, with metro networks, e.g., [42]- [45], poses several open research challenges for efficient interoperability and bandwidth management [46]- [48].…”

Section: Discussionmentioning

confidence: 99%

Investigation of the DBA Algorithm Design Space for EPONs

McGarry

Reisslein

2012

J. Lightwave Technol.

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Abstract-The implications of the main components of dynamic bandwidth allocation (DBA) algorithms in ethernet passive optical networks, namely grant scheduling framework, grant sizing, and grant scheduling, have to date been examined in isolation. In contrast, we conduct a comprehensive throughput-delay comparison study of the three main DBA components; whereby, for each of the DBA components, we consider a range of common mechanisms. Our comparison study considers a number of novel combinations of mechanisms for the individual DBA algorithms, such as the double-phase polling (DPP) scheduling framework combined with limited with excess distribution grant sizing, and shortest propagation delay (SPD) first scheduling. We find that this (DPP, Limited with excess, SPD) combination in conjunction with a novel excess sharing mechanism outperforms previously studied DBA algorithms.

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Section: Discussionmentioning

confidence: 99%

Investigation of the DBA Algorithm Design Space for EPONs

McGarry

Reisslein

2012

J. Lightwave Technol.

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“…Flexible transceivers Flexible modulations and distance-adaptive transceivers Metro: [30] Access: [31][32][33] Super-channels and flexible WDM grids Flexible grid Access: [34,35] Metro: [30,35] Spatial super-channels Access: [36] Optical routing at the physical layer Flow routing Access: [37][38][39] ROADM Metro: [40][41][42][43][44][45][46][47] Access: [41] Optical switching at the physical layer OPS, OLS, OBS Metro: [48][49][50][51] Access: [49,52] Flexible modulations and distance-adaptive transceivers Metro: [30] Access: [31][32][33] All these trends and solutions would enable re-configurability and programmability in metro and access segments, allowing these networks to address the challenges raised in the Section 2.…”

Section: Technological Trends Technological Solutions References For mentioning

confidence: 99%

“…Townsend and Talli [86] have proposed a hybrid DWDM-TDM long-reach PON. The architecture proposed by Segarra et al [50] leverages the concept of an OBS multiplexer to transparently interface to distant metro routers in an all-optical manner. Stanford University ACCESS (SUCCESS) network is a hybrid WDM/TDM architecture based on a single-fiber collector ring and stars attached to it, designed for practical migration steps from current TDM-PONs to WDM optical access networks.…”

Section: Converged Fixed-mobile Networkmentioning

confidence: 99%

Future Scenarios for Software-Defined Metro and Access Networks and Software-Defined Photonics

Muciaccia

Passaro

2017

Photonics

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Abstract:In recent years, architectures, devices, and components in telecommunication networks have been challenged by evolutionary and revolutionary factors which are drastically changing the traffic features. Most of these changes imply the need for major re-configurability and programmability not only in data-centers and core networks, but also in the metro-access segment. In a wide variety of contexts, this necessity has been addressed by the proposed introduction of the innovative paradigm of software-defined networks (SDNs). Several solutions inspired by the SDN model have been recently proposed also for metro and access networks, where the adoption of a new generation of software-defined reconfigurable integrated photonic devices is highly desirable. In this paper, we review the possible future application scenarios for software-defined metro and access networks and software-defined photonics (SDP), on the base of analytics, statistics, and surveys. This work describes the reasons underpinning the presented radical change of paradigm and summarizes the most significant solutions proposed in literature, with a specific emphasis to physical-layer reconfigurable networks and a focus on both architectures and devices.

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“…In the upstream direction, the DBA module monitors the ONUs traffic status with a polling cycle [4]. The polling cycle T c must be slightly lower than the aggregation time t edge , therefore t edge /2 is a good option.…”

Section: Dynamic Bandwidth Allocation For R-onusmentioning

confidence: 99%

“…Nonetheless, its exploitation was limited by the lack of an economical solution to wavelength optical transmitters in the Optical Network Unit (ONU) at the customers' premises. This issue is dramatically alleviated by the use of a Reflective-ONU (R-ONU), which is wavelength seeded by an optical carrier sent by a tunable laser diode (LD) at the Optical Line Terminal (OLT) in the Central Office [4][5][6][7]. In this way, all the ONUs are equal and colorless, avoiding cumbersome laser provisioning and critical stabilization.…”

mentioning

confidence: 99%

A nesting ranging algorithm for a Hybrid WDM/TDM PON with colorless Reflective-ONUs under different distances OLT-ONUs

2008

Self Cite

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To reduce costs and cumbersome laser provisioning at the Optical Network Unit (ONU) user level in an access Passive Optical Network (PON), the use of a Reflective-ONU (R-ONU) is a good choice for up-data transmission. An optical carrier is sent by the Optical Line Terminal (OLT) at the Central Office, and a device at the ONU modulates the carrier with the upstream data. This allows all ONUs to be equal and colorless, without a light source in a Hybrid WDM/TDM architecture. A Dynamic Bandwidth Allocation is placed at the OLT, managing the lasers and photodetectors shared by all R-ONUs. The OLT laser and photodetector employed in an up-data transmission must be tuned for each ONU and a particular Round Trip Time (RTT), which is twice the propagation time from OLT to ONU. When an R-ONU is served by a laser, the photodetector must also be available after the RTT to demodulate the up-data. We propose a novel nesting ranging algorithm to deal with large different distances OLT-ONUs avoiding collisions and minimizing the delay under Priority Queuing with Quality of Service (QoS).

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An All-Optical Access–Metro Interface for Hybrid WDM/TDM PON Based on OBS

Cited by 30 publications

References 46 publications

Investigation of the DBA Algorithm Design Space for EPONs

Investigation of the DBA Algorithm Design Space for EPONs

Future Scenarios for Software-Defined Metro and Access Networks and Software-Defined Photonics

A nesting ranging algorithm for a Hybrid WDM/TDM PON with colorless Reflective-ONUs under different distances OLT-ONUs

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