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Papers by David Gutierrez

IEEE Communications Magazine, 2005

Optical access networks are considered to be a definite solution to the problem of upgrading curr... more Optical access networks are considered to be a definite solution to the problem of upgrading current congested access networks to ones capable of delivering future broadband integrated services. However, the high deployment and maintenance cost of traditional point-to-point architectures is a major economic barrier. Current TDM-PON architectures are economically feasible, but bandwidth-limited. In this article we first discuss the possible role of WDM in access networks and investigate the associated issues. We then present the Stanford University Access Hybrid WDM/TDM Passive Optical Network (SUCCESS-HPON), a next-generation hybrid WDM/TDM optical access architecture that focuses on providing a smooth migration path from current TDM-PONs to future WDM-PONs. The first testbed for this architecture is described, along with the experimental results obtained, including feasibility of bidirectional transmission on the same wavelength on the same fiber for access networks and ONU modulation of upstream data on continuous waves provided by the OLT, eliminating the need for tunable components at the ONUs. The development of a second testbed and the issues it will address, including the implementability of the SUCCESS-HPON MAC protocol and scheduling algorithms, are also described.

IEEE/OSA Journal of Lightwave Technology, 2007

In this paper we investigate the current status of Fiber-to-the-Home Passive Optical Networks. We... more In this paper we investigate the current status of Fiber-to-the-Home Passive Optical Networks. We start by reviewing the driving forces behind the push for broadband from the customer and service provider sides. PONs are currently preferred for new FTTH deployments for a ...

IEEE/OSA Journal of Lightwave Technology, 2004

In this paper, the authors propose a next-generation hybrid WDM/TDM optical access network archit... more In this paper, the authors propose a next-generation hybrid WDM/TDM optical access network architecture called Stanford University aCCESS or SUCCESS. This architecture provides practical migration steps from current-generation time-division multiplexing (TDM)-passive optical network (PONs) to future WDM optical access networks. The architecture is backward compatible for users on existing TDM-PONs, while simultaneously capable of providing upgraded high-bandwidth services to new users on DWDM-PONs through advanced WDM techniques. The SUCCESS architecture is based on a collector ring and several distribution stars connecting the CO and the users.

IEEE/OSA Journal of Lightwave Technology, 2007

We propose a sublambda traffic-grooming scheme on wavelength-division-multiplexing ring networks,... more We propose a sublambda traffic-grooming scheme on wavelength-division-multiplexing ring networks, named optical burst transport. The network protocol and architecture are designed to support dynamic bandwidth allocation, which is more reasonable for bursty data traffic. To verify our network protocol and architecture, we build a testbed which supports burst-mode transmission. Also, we transmit streaming video over Ethernet as an application.

In this paper we study the problem of scheduling variable-length frames in WDM-PON under Stanford... more In this paper we study the problem of scheduling variable-length frames in WDM-PON under Stanford University aCCESS (SUCCESS), a next-generation hybrid WDM/TDM optical access network architecture. The SUCCESS WDM-PON architecture has unique features that have direct impact on the design of scheduling algorithms: First, tunable transmitters and receivers at OLT are shared by ONUs to reduce transceiver counts; Second, the tunable transmitters not only generate downstream data traffic but also provide ONUs with optical Continuous Wave (CW) bursts for upstream transmissions. To provide efficient bidirectional transmissions between OLT and ONUs, we propose a batch scheduling algorithm based on the sequential scheduling algorithm previously studied. The key idea is to provide room for optimization and priority queueing by scheduling over more than one frame. In the batch scheduling, frames arrived at OLT during a batch period are stored in Virtual Output Queues (VOQs) and scheduled at the end of the batch period. Through simulation with various configurations, we demonstrate that the proposed batch scheduling algorithm, compared to the original sequential scheduling algorithm, provides higher throughput, especially when the system load is high, and better fairness between up-and downstream transmissions.

A novel method to broadcast a video stream to all subscribers in WDM-PON is proposed and experime... more A novel method to broadcast a video stream to all subscribers in WDM-PON is proposed and experimentally implemented. Using a broadband light source, we have achieved successful transmission performance with our proposed method.

IEEE/OSA Journal of Lightwave Technology, 2005

We report the results of our design and performance analysis of two new algorithms for efficient ... more We report the results of our design and performance analysis of two new algorithms for efficient and fair scheduling of variable-length frames in a wavelength division multiplexing (WDM)-passive optical network (PON) under Stanford University aCCESS-Hybrid PON (SUCCESS-HPON) architecture. The WDM-PON under the SUCCESS-HPON architecture has unique features that have direct impacts on the design of scheduling algorithms: First, an optical line terminal (OLT) uses tunable transmitters and receivers that are shared by all the optical network units (ONUs) served by the OLT to reduce the number of expensive dense WDM (DWDM) transceivers. Second, also for cost reduction, ONUs have no local DWDM light sources but use optical modulators to modulate optical continuous wave (CW) bursts provided by the OLT for upstream transmissions.

We present a method to obtain an end-to-end characterization of the performance of an application... more We present a method to obtain an end-to-end characterization of the performance of an application over a network. This method is not dependent on any specific application or type of network. The method requires characterization of network parameters, such as latency and packet loss, between the expected server or client endpoints, as well as characterization of the application's constraints on these parameters. A subjective metric is presented that integrates these characterizations and that operates over a wide range of applications and networks. We believe that this method may be of wide applicability as research and educational applications increasingly make use of computation and data servers that are distributed over the Internet.

IEEE Communications Magazine, 2005

Optical access networks are considered to be a definite solution to the problem of upgrading curr... more Optical access networks are considered to be a definite solution to the problem of upgrading current congested access networks to ones capable of delivering future broadband integrated services. However, the high deployment and maintenance cost of traditional point-to-point architectures is a major economic barrier. Current TDM-PON architectures are economically feasible, but bandwidth-limited. In this article we first discuss the possible role of WDM in access networks and investigate the associated issues. We then present the Stanford University Access Hybrid WDM/TDM Passive Optical Network (SUCCESS-HPON), a next-generation hybrid WDM/TDM optical access architecture that focuses on providing a smooth migration path from current TDM-PONs to future WDM-PONs. The first testbed for this architecture is described, along with the experimental results obtained, including feasibility of bidirectional transmission on the same wavelength on the same fiber for access networks and ONU modulation of upstream data on continuous waves provided by the OLT, eliminating the need for tunable components at the ONUs. The development of a second testbed and the issues it will address, including the implementability of the SUCCESS-HPON MAC protocol and scheduling algorithms, are also described.

IEEE/OSA Journal of Lightwave Technology, 2007

In this paper we investigate the current status of Fiber-to-the-Home Passive Optical Networks. We... more In this paper we investigate the current status of Fiber-to-the-Home Passive Optical Networks. We start by reviewing the driving forces behind the push for broadband from the customer and service provider sides. PONs are currently preferred for new FTTH deployments for a ...

IEEE/OSA Journal of Lightwave Technology, 2004

In this paper, the authors propose a next-generation hybrid WDM/TDM optical access network archit... more In this paper, the authors propose a next-generation hybrid WDM/TDM optical access network architecture called Stanford University aCCESS or SUCCESS. This architecture provides practical migration steps from current-generation time-division multiplexing (TDM)-passive optical network (PONs) to future WDM optical access networks. The architecture is backward compatible for users on existing TDM-PONs, while simultaneously capable of providing upgraded high-bandwidth services to new users on DWDM-PONs through advanced WDM techniques. The SUCCESS architecture is based on a collector ring and several distribution stars connecting the CO and the users.

IEEE/OSA Journal of Lightwave Technology, 2007

We propose a sublambda traffic-grooming scheme on wavelength-division-multiplexing ring networks,... more We propose a sublambda traffic-grooming scheme on wavelength-division-multiplexing ring networks, named optical burst transport. The network protocol and architecture are designed to support dynamic bandwidth allocation, which is more reasonable for bursty data traffic. To verify our network protocol and architecture, we build a testbed which supports burst-mode transmission. Also, we transmit streaming video over Ethernet as an application.

In this paper we study the problem of scheduling variable-length frames in WDM-PON under Stanford... more In this paper we study the problem of scheduling variable-length frames in WDM-PON under Stanford University aCCESS (SUCCESS), a next-generation hybrid WDM/TDM optical access network architecture. The SUCCESS WDM-PON architecture has unique features that have direct impact on the design of scheduling algorithms: First, tunable transmitters and receivers at OLT are shared by ONUs to reduce transceiver counts; Second, the tunable transmitters not only generate downstream data traffic but also provide ONUs with optical Continuous Wave (CW) bursts for upstream transmissions. To provide efficient bidirectional transmissions between OLT and ONUs, we propose a batch scheduling algorithm based on the sequential scheduling algorithm previously studied. The key idea is to provide room for optimization and priority queueing by scheduling over more than one frame. In the batch scheduling, frames arrived at OLT during a batch period are stored in Virtual Output Queues (VOQs) and scheduled at the end of the batch period. Through simulation with various configurations, we demonstrate that the proposed batch scheduling algorithm, compared to the original sequential scheduling algorithm, provides higher throughput, especially when the system load is high, and better fairness between up-and downstream transmissions.

A novel method to broadcast a video stream to all subscribers in WDM-PON is proposed and experime... more A novel method to broadcast a video stream to all subscribers in WDM-PON is proposed and experimentally implemented. Using a broadband light source, we have achieved successful transmission performance with our proposed method.

IEEE/OSA Journal of Lightwave Technology, 2005

We report the results of our design and performance analysis of two new algorithms for efficient ... more We report the results of our design and performance analysis of two new algorithms for efficient and fair scheduling of variable-length frames in a wavelength division multiplexing (WDM)-passive optical network (PON) under Stanford University aCCESS-Hybrid PON (SUCCESS-HPON) architecture. The WDM-PON under the SUCCESS-HPON architecture has unique features that have direct impacts on the design of scheduling algorithms: First, an optical line terminal (OLT) uses tunable transmitters and receivers that are shared by all the optical network units (ONUs) served by the OLT to reduce the number of expensive dense WDM (DWDM) transceivers. Second, also for cost reduction, ONUs have no local DWDM light sources but use optical modulators to modulate optical continuous wave (CW) bursts provided by the OLT for upstream transmissions.

We present a method to obtain an end-to-end characterization of the performance of an application... more We present a method to obtain an end-to-end characterization of the performance of an application over a network. This method is not dependent on any specific application or type of network. The method requires characterization of network parameters, such as latency and packet loss, between the expected server or client endpoints, as well as characterization of the application's constraints on these parameters. A subjective metric is presented that integrates these characterizations and that operates over a wide range of applications and networks. We believe that this method may be of wide applicability as research and educational applications increasingly make use of computation and data servers that are distributed over the Internet.