A Hybrid WDM/TDM PON architecture using wavelength selective switches

In this paper we propose some new hybrid WDM/TDM PON architectures that use wavelength selective switches at the remote node to improve flexibility, data security and power budget. We compare it with the existing WDM/TDM PONs in terms of cost and power budget

Optically reconfigurable 1 x 4 remote node switch for access networks

In this paper we demonstrate an optically controlled 1 x 4 remote node switch, based on membrane InP switches bonded to a silicon-on-insulator circuit. We show that the switch exhibits cross talk better than 25 dB between the output ports, and that the switch operates without receiver sensitivity penalty. Furthermore, the proposed switch architecture allows for optical clock distribution as a means to avoid the need for clock recovery at the receiver side. This is demonstrated in a proof-of-principle experiment where data and clock are sent through a single membrane InP switch

High speed polling protocol for multiple node network with sequential flooding of a polling message and a poll-answering message

The invention is a multiple interconnected network of intelligent message-repeating remote nodes which employs a remote node polling process performed by a master node by transmitting a polling message generically addressed to all remote nodes associated with the master node. Each remote node responds upon receipt of the generically addressed polling message by sequentially flooding the network with a poll-answering informational message and with the polling message

Protocol for multiple node network

The invention is a multiple interconnected network of intelligent message-repeating remote nodes which employs an antibody recognition message termination process performed by all remote nodes and a remote node polling process performed by other nodes which are master units controlling remote nodes in respective zones of the network assigned to respective master nodes. Each remote node repeats only those messages originated in the local zone, to provide isolation among the master nodes

High speed polling protocol for multiple node network

The invention is a multiple interconnected network of intelligent message-repeating remote nodes which employs a remote node polling process performed by a master node by transmitting a polling message generically addressed to all remote nodes associated with the master node. Each remote node responds upon receipt of the generically addressed polling message by transmitting a poll-answering informational message and by relaying the polling message to other adjacent remote nodes

Wavelength switched hybrid TDMA/WDM (TWDM) PON: a flexible next-generation optical access solution

In this paper, we propose the system concepts of a next-generation wavelength switched hybrid time division multiple access and wavelength division multiplexing (TWDM) passive optical network (PON) architecture. In this architecture, wavelength selective switches (WSSs) are used at the remote node to improve flexibility, data security and power budget compared to other TWDM-PON variants. We map the proposed architecture to the requirements of next-generation optical access networks in a 2020 perspective. Finally, we benchmark the proposed architecture with other proposed TWDM-PON solutions

Optically Reconfigurable 1x4 Silicon-on-Insulator Remote Node Switch for Access Networks

Operation of an optically controlled 1x4 remote node, based on membrane InP switches and SOI waveguide circuits, is shown. Extinction ratio >25dB and penalty-free operation for 10Gb/s 2(31)-1 PRBS data through the switch are demonstrated

コウミツド ハチョウ タジュウ オ モチイタ ヒカリ アクセス ホウシキ ニ オケル コウゲン ノ ハチョウ セイギョ

This paper describes a high density wavelength division multiplexing (WDM) optical access network for broadband access networks. In the network, a wavelength is pre-assigned to each subscriber. Arrayed waveguide gratings (AWGs) are used at a central office and a remote node for wavelength multi/demultiplexers. We introduce a method to tune the wavelengths of transmitters in both the central office and the subscriber premises to the center of each assigned transmission spectrum of an access network. Using this method, we confirm experimentally the controllability of the wavelengths on four laser diodes in the access network which was composed of two subscribers. The 1×40 AWGs with 0.8 nm spacing were used. The experimental results indicate the controllability of the wavelengths of transmitters within the deviation of ±0.25nm from the center of the transmission spectrum of two AWGs. The wavelengths are controlled during the environmental temperature of the AWG in the remote node varies within the range of ±20℃. The temperature range of ±20℃ is not enough for practical use. So as to minimize the temperature change of AWG, we propose a WDM access network which utilizes an athermal AWG in the remote node. The perfect temperature compensation of the athermal AWG is not necessarily required because the wavelength control system already exists. This results in the cost reduction of the athermal AWG. We study the wavelength control using cost-effective one-board-computer instead of the measurement server