Yueping Cai

Design and Evaluation of an Optical Broadcast-and-Select Network Architecture With a Centralized Multicarrier Light Source

This paper presents the design and evaluation of our optical broadcast-and-select wavelength-routed network architecture that uses a centralized multicarrier light source (C-MCLS). The large number of optical carriers/wavelengths generated by the C-MCLS are distributed to all edge nodes (ENs), which select and modulate wavelengths to realize upstream transmission. To utilize wavelengths efficiently, we introduce a framework for wavelength allocation and selection (WAS). Both static and dynamic schemes are adopted for WAS and their implementations are shown. By using fixed or tunable band pass filters and periodic arrayed waveguide grating demultiplexers, wavelengths are selected and utilized by ENs in a static or dynamic manner. After considering the design parameters used in the implementations, wavelength allocation procedures are described. We evaluate the cost, power consumption and network performance of the proposed network. Numerical results show that it offers greatly reduced cost and power consumption compared to the conventional one when the number of required access wavelengths at EN becomes large. We delineate its applicable areas through cost comparisons. Blocking probabilities of static and dynamic schemes are analyzed to evaluate network performance. Numerical results show that by choosing appropriate design parameters, the dynamic scheme offers about 25% increase in admissible offered load under the specified blocking probability, compared to the static scheme. This indicates that the dynamic scheme makes the proposed network more robust against traffic fluctuations.

Optical drop-add-drop network architecture with centralized multi-carrier light source

This letter proposes an optical drop-add-drop network architecture with a centralized multi-carrier light source (C-MCLS) for regional and metro network applications. In the drop-add-drop network, optical carriers generated by the CMCLS are dropped at the source nodes and used for uplink transmission. Data are added to the network after external modulations of the carriers. Data are then dropped at the destination nodes. The reconfigurable optical add/drop multiplexer (ROADM) at each node is not only used to add and drop data, but also to drop carriers, which eliminates the distributed laser diodes needed by the conventional network. Network cost analysis and numerical results show that it offers significantly lower network cost compared to the conventional network if the total number of used wavelengths in the network is large. We evaluate its optical performance through an optical signal-to-noise ratio (OSNR) analysis. We show its applicable network size in terms of fiber span length and the number of nodes under a specified bit error rate (BER) when changing the OSNR of the C-MCLS.

Optical broadcast-and-select network architecture with centralized multi-carrier light source

We propose an optical broadcast-and-select network architecture with centralized multi-carrier light source (C-MCLS). It enables all network nodes access a large number of optical carriers in a cost-effective manner through dynamic optical broadcast and select. Cost analysis and numerical results show that it greatly reduces the light source cost compared with the conventional one, as the number of required access wavelengths at network nodes becomes large. We also show its cost-effective areas in different cases of cost calculation. The obtained results indicate that it is very promising for future regional/metro networks, which demand a large number of wavelengths.

Hybrid static-dynamic wavelength/waveband allocation scheme for novel broadcast and select star-ring optical regional network

We have proposed a novel star-ring optical regional network architecture with dynamic wavelength/waveband broadcast and select based on bandwidth reservation. In this network, the large number of wavelength resources generated by a single multi-carrier light source can be shared and utilized in a flexible and simple way. In this paper, a hybrid static-dynamic wavelength/waveband allocation scheme combined with dynamic traffic banding has been proposed to reduce the network cost and complexity. To achieve this goal, we define one hybrid static- dynamic wavelength/waveband partition scheme, and develop two wavelength/waveband allocation algorithms based on it. One is maximum waveband first (MWF) allocation and the other is waveband round Robin (WRR) allocation. Both physical implementation analysis and computer simulation have been carried out to verify our ideas. According to the results, our proposal can effectively reduce the number of used optical switching ports and simplify the edge node architecture.

Optical Broadcast-and-Select Network Architecture with Centralized Multi-Carrier Light Source

This paper proposes an optical broadcast-and-select network architecture with centralized multi-carrier light source (C-MCLS). A large number of optical carriers/wavelengths generated by C-MCLS are distributed to all edge nodes (ENs), which select and modulate wavelengths to realize transmission. To utilize wavelength resources efficiently, we introduce a framework of wavelength allocation and selection (WAS). Wavelength allocation is performed at a wavelength control server, while wavelength selection is done at each EN according to wavelength allocation results. Both static and dynamic schemes are adopted for WAS and their implementations are shown. By using fixed or tunable band pass filter and periodical arrayed waveguide grating demultiplexer, wavelengths are selected and utilized by ENs in a static or dynamic manner. We evaluate network cost and performance of the proposed network. Cost analysis and numerical results show that it offers greatly reduced cost compared to the conventional one when the number of required access wavelengths at EN becomes large. We delineate its applicable areas through cost comparisons. Blocking probabilities of static and dynamic schemes are analyzed to evaluate network performance. Numerical results show that by choosing appropriate design parameters, the dynamic scheme offers about 25% increase in admissible offered load under the specified blocking probability, compared to the static scheme. This indicates that the dynamic scheme makes the proposed network more robust against traffic fluctuations.

Modeling and architecture design of novel optical broadcast-and-select network with centralized multi-carrier light source

We present the modeling and architecture design of proposed optical regional networks with centralized multi-carrier light source. The analysis results show that our proposal achieves better network performance and lower cost than traditional ones.

Resilient optical broadcast-and-select network using centralized multi-carrier light source

This paper presents a resilient star-ring optical broadcast-and-select network with a centralized multi-carrier light source (C-MCLS). It consists of a star part network and a ring part network. Optical carriers generated by the C-MCLS are broadcast to all network nodes, which select and utilize them for data transmission. Optical carrier distribution and data transmission are performed in the star part network. The ring part network is for fiber failure recovery. The network resilience property enables the design of a fast distributed failure recovery scheme to deal with single and multiple fiber failures. We introduce a fiber connection automatic protection switching (FC-APS) architecture that only consists of optical couplers and switches for each network node. We design a distributed failure recovery scheme based on it. The fiber failure detection and failure recovery operations are performed by each network node independently only using its local information. We evaluate the recovery time of the distributed scheme compared with that of the centralized one. Numerical results show that it greatly reduces the recovery time than the centralized one.

A resilient star-ring optical broadcast-and-select network with a centralized multi-carrier light source

This article presents a resilient star-ring optical broadcast-and-select network with a centralized multi-carrier light source (C-MCLS). It consists of a star part network and a ring part network. Optical carriers generated by the C-MCLS are broadcast to all network nodes, which select and utilize them for data transmission. Optical carrier distribution as well as data transmission and receiving are performed in the star part network. The ring part network is for fiber failure recovery. The network resilience property enables the design of a fast distributed failure recovery scheme to deal with single and multiple fiber failures. We introduce a fiber connection automatic protection switching (FC-APS) architecture that only consists of optical couplers and 1 × 2 optical switches for each network node. Based on the FC-APS architecture, we design a distributed failure recovery scheme to recover the carriers and data affected by fiber failures. The fiber failure detection and failure recovery operations are performed by each network node independently only using its local information. We evaluate the recovery time of the distributed failure recovery scheme compared with that of the centralized one. Numerical results show that the distributed scheme greatly reduces the recovery time compared to the centralized configuration in the recoveries of both single and multiple fiber failures. Optical power loss analysis and compensation of the recovery routes in the distributed scheme are also presented. We show the required number of optical amplifiers for the longest recovery route in the distributed scheme under different numbers of network nodes and fiber span lengths.