Packet scheduling in a low-latency optical switch with wavelength division multiplexing and electronic buffer

2011 ◽  
Author(s):  
Lin Liu ◽  
Zhenghao Zhang ◽  
Yuanyuan Yang
Keyword(s):  
Wavelength Division Multiplexing ◽  
Packet Scheduling ◽  
Optical Switch ◽  
Low Latency ◽  
Wavelength Division

Bidirectional Hybrid Optical Communication System Based on Wavelength Division Multiplexing for Outdoor Applications

2021 ◽  
Author(s):  
Sinan M. Abdulsatar ◽  
Mohammed A. Saleh ◽  
Abadulla Abass ◽  
M. H. Ali ◽  
Mohammed Ali Yaseen
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Data Transmission ◽  
Communication System ◽  
Optical Switch ◽  
Heavy Rain ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Backup System ◽  
All Optical

Abstract The simulation and investigation of a 32×10 Gb/s WDM all–optical bidirectional hybrid communication system for outdoor applications is presented in this article via multidisciplinary softwares. In order to track the system condition, a strain sensor based on fiber Bragg grating (FBG) is integrated in–line with the fiber optic link (FO–link). Then, a free space optical link (FSO–link) with 4–channel is simulated to act backup or rescue to the FO–link in the event of disaster or bombing. The FO–link is working well until the strain reach to 180 µε, after that the FO–link has degraded. Therefore, an optical switch is incorporated in between these systems (FO–link & FSO–link) to turn–on the FSO–link which act as a backup system to FO–link and maintains the continuity of the data transmission. According to the hybrid link results, there is an efficient enhancement in the Q–factor as compared with the FO–link even when there is heavy rain.

A Large-Capacity Optical Switch Design for High-Speed Optical Data Centers

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Utkarsh Shukla ◽  
Niraj Singhal ◽  
Rajiv Srivastava
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Optical Switch ◽  
Optical Data ◽  
Wavelength Division ◽  
Wavelength Router ◽  
Advantages And Disadvantages ◽  
Fiber Technology ◽  
Fast Processing ◽  
Switch Design

AbstractDue to the emergence of high-speed applications, demand for more bandwidth has increased exponentially in last a few years. To serve each user for his demand very fast processing and propagation of data is desired. These two requirements of high-speed communication can be fulfilled using optical fiber technology. In the same view in past many optical switch designs have emerged with their respective advantages and disadvantages. This paper proposes a wavelength division multiplexing (WDM)-based switch incorporating arrayed waveguide grating (AWG) as wavelength router and fiber delay lines (FDL) to create optical buffer. Proposed switch design is compared with recent switch design and it is found that both in terms of BER and packet loss probability the performance of proposed design is much better in comparison to earlier designs.

Multimedia Encrypted Experiment of Reconfigurable Wavelength Hopping Protection against Eavesdroppers over a Wireless Wavelength Division Multiplexing Network

2020 ◽  
Author(s):  
Yao-Tang Chang
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Video Transmission ◽  
Optical Switch ◽  
Experimental Results ◽  
High Definition ◽  
Wavelength Division ◽  
Wireless Optical Communication ◽  
Multimedia Interface ◽  
Energy Signal

To enhance the video transmission security of a physical layer over wireless optical communication, an optical switch configured in front of an arrayed waveguide grating (AWG) router is proposed for implementing reconfigurable wavelength hopping configuration over a wavelength division multiplexing network for protection against eavesdropping. In the practical experiment of an AWG/optical-switch-based random wavelength hopping scheme, a simulated pseudorandom noise generator algorithm was designed and embedded into a master–slave microprocessor (e.g., Arduino chips) to generate a time series of electrical signals for triggering an optical switch. The path of the optical switch was randomly varied to change the space transmission of the AWG router. Therefore, varying wavelengths were assigned as the carriers of authorized users to realize the AWG/optical-switch-based wavelength hopping scheme. An optical spectrum analyzer and an oscilloscope were used for monitoring measurement. The experimental results indicated that eavesdroppers cannot accurately interpret analog, digital, audio, and uncompressed high-definition multimedia interface signals of 10 MHz, 1 MHz, 3.125 MHz (encoded into 6.25 MHz), and 1.485 GHz, respectively. According to the experimental results, authorized and unauthorized users are characterized by a large difference in the retrieved energy signal, which ensures the safety and privacy of the proposed AWG/optical-switch-based reconfigurable wavelength hopping scheme over a wireless optical communication network.

scholarly journals Hybrid Ring- and Tree-Topology RoF Transmission System with Disconnection Protection

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 515
Author(s):  
Chung-Yi Li ◽  
Ching-Hung Chang ◽  
Zih-Guei Lin
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Switch ◽  
Transmission System ◽  
Tree Topology ◽  
Base Stations ◽  
Optical Signals ◽  
Wavelength Division ◽  
Fiber Link ◽  
Hybrid Ring

This paper proposes a hybrid ring- and tree-topology radio over fiber (RoF) transmission system with self-disconnection protection that can support the high distribution density of base stations (BSs) in a metropolitan area and strengthen the network quality of service through self-disconnection protection. The number of supportable BS in the system can be increased significantly by integrating the time- and wavelength-division multiplexing techniques and properly utilizing a new-generation single-line bidirectional add/drop multiplexer (SBOADM) into the proposed system. Moreover, when the ring–fiber link of the system is interrupted for any reason, the system operator can recover the broken connections quickly only by transforming an optical switch state at the CO end to allow the downlink optical signals to transmit along the clockwise and counterclockwise directions of the ring–fiber link simultaneously. In this case, the downstream optical signals can be delivered to each set of BS-groups through the two-way transmission characteristics of the SBOADM automatically, and the uplink optical signals, originally, from each set of BS-groups can be transmitted back to the CO end along the opposite direction of the downlink signal-routing path. In this way, the interference caused by fiber breakage can be avoided immediately, and the entire transport system can be reconnected to ensure the quality of network services. Our experimental results prove that the overall transmission performances are similar to those under normal circumstances.

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