scholarly journals 10 Gb/s Bidirectional Transmission with an Optimized SOA and a SOA-EAM Based ONU

2020 ◽  
Vol 10 (24) ◽  
pp. 8960
Author(s):  
Xin Rui Chen ◽  
Guang Yong Chu
Keyword(s):  
Optical Networks ◽  
Forward Error Correction ◽  
Low Cost ◽  
Optical Network ◽  
Optical Amplifier ◽  
Optical Network Unit ◽  
The Us ◽  
Dfb Laser ◽  
Forward Error ◽  
Bidirectional Transmission

We investigated the application of a semiconductor optical amplifier (SOA) and an SOA electro-absorption modulator (SOA-EAM) as attractive, low-cost solutions in passive optical networks (PONs). The main characteristics of an SOA with optimal performance for phase and amplitude modulation were tested. Additionally, a 10 Gb/s bidirectional transmission with an optical network unit (ONU) transmitter integrated with a distributed feedback (DFB) laser, electro-absorption modulator (EAM), and SOA was designed. The upstream (US) and downstream (DS) receiver sensitivities at the forward error correction (FEC) level reached −29.5 dBm and −33.5 dBm for back-to-back (BtB) fiber and −28.9 dBm and −33.1 dBm for 20 km fiber. For multichannel transmission, the US receiver sensitivities reached −28.8 dBm and −28.2 dBm for BtB and 20 km fibers, and the DS receiver sensitivities reached −33 dBm and −32.6 dBm for BtB and 20 km fibers, respectively.

Ethernet Passive Optical Networks

2009 ◽  
pp. 482-488
Author(s):  
Mário M. Freire ◽  
Paulo P. Monteiro ◽  
Henrique J.A. da Silva ◽  
José Ruela
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Low Cost ◽  
Optical Network ◽  
Cost Effective ◽  
Passive Optical Networks ◽  
Multipoint Control ◽  
Upstream Direction ◽  
Working Groups ◽  
Ethernet Passive Optical Networks

Recently, Ethernet Passive Optical Networks (EPONs) have received a great amount of interest as a promising cost-effective solution for next-generation high-speed access networks. This is confirmed by the formation of several fora and working groups that contribute to their development, namely the EPON Forum (http://www. ieeecommunities.org/epon), the Ethernet in the First Mile Alliance (http://www.efmalliance.org), and the IEEE 802.3ah working group (http://www.ieee802. org/3/efm), which is responsible for the standardization process. EPONs are a simple, inexpensive, and scalable solution for high-speed residential access capable of delivering voice, high-speed data, and multimedia services to end users (Kramer, Mukherjee, & Maislos, 2003; Kramer & Pesavento, 2002; Lorenz, Rodrigues, & Freire, 2004; McGarry, Maier, & Reisslein, 2004; Pesavento, 2003). An EPON combines the transport of IEEE 802.3 Ethernet frames over a low-cost and broadband point-to-multipoint passive optical fibre infrastructure connecting the optical line terminal (OLT) located at the central office to optical network units (ONUs) usually located at the subscriber premises. In the downstream direction, the EPON behaves as a broadcast and select shared medium, with Ethernet frames transmitted by the OLT reaching every ONU. In the upstream direction, Ethernet frames transmitted by each ONU will only reach the OLT, but an arbitration mechanism is required to avoid collisions. This article provides an overview of EPONs focused several issues: EPON architecture, multipoint control protocol (MPCP), quality of service (QoS), and operations, administration, and maintenance (OAM) capability of EPONs.

An Integrated High-Speed Full Duplex Coherent OFDM-PON and Visible-Light Communication System

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Simarpreet Kaur ◽  
Mahendra Kumar ◽  
Ashu Verma
Keyword(s):  
Visible Light ◽  
Optical Networks ◽  
High Speed ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Dispersion Compensation ◽  
Optical Network ◽  
Visible Light Communication ◽  
Passive Optical Network ◽  
Full Duplex

AbstractWe demonstrated a full duplex hybrid passive optical network and indoor optical wireless system employing coherent optical frequency division multiplexing. To accomplish reliable transmission in passive optical networks integrated visible-light communication (VLC), yellow light-emitting diode and infrared LED is used in downstream and upstream, respectively, for intra building network. In order to support high data rate, pulse-width reduction scheme based on dispersion compensation fiber is incorporated and system successfully covered the distance of 50 km. A data stream at the rate of 30 Gb/s is transmitted for each user out of eight users. VLC-supported users are catered with the bit rate of 1.87 Gb/s over 150 cm and in order to realize a low-cost system, visible and infrared LEDs are used in downlink and uplink, respectively.

Optical network unit‐based traffic prediction for Ethernet passive optical networks

2014 ◽  
Vol 8 (5) ◽  
pp. 349-357 ◽  
Author(s):  
Ioannis Mamounakis ◽  
Konstantinos Yiannopoulos ◽  
Georgios Papadimitriou ◽  
Emmanuel Varvarigos
Keyword(s):  
Optical Networks ◽  
Optical Network ◽  
Passive Optical Networks ◽  
Traffic Prediction ◽  
Optical Network Unit ◽  
Ethernet Passive Optical Networks

Multiwavelength DFB laser arrays with integrated combiner and optical amplifier for WDM optical networks

1997 ◽  
Vol 3 (2) ◽  
pp. 584-597 ◽  
Author(s):  
Chung-En Zah ◽  
M.R. Amersfoort ◽  
B.N. Pathak ◽  
F.J. Favire ◽  
P.S.D. Lin ◽  
...  
Keyword(s):  
Optical Networks ◽  
Optical Amplifier ◽  
Wdm Optical Networks ◽  
Laser Arrays ◽  
Dfb Laser

A Simple Way to Compute Parameters for Load Balancer in Optical Networks

2014 ◽  
Vol 918 ◽  
pp. 292-294
Author(s):  
Chia Sheng Tsai ◽  
Sun Wei Cho
Keyword(s):  
Load Balancing ◽  
Optical Networks ◽  
Service Providers ◽  
Low Cost ◽  
Optical Network ◽  
Multipath Routing ◽  
Traffic Grooming ◽  
Dynamic Traffic ◽  
Load Balancer ◽  
Dynamic Traffic Grooming

In this paper, we use the optical dynamic grooming concept to design load balancer. This paper proposes a new solution to achieve optimal load balancing for a streaming server. Dynamic traffic grooming can be utilized in combination with multipath routing to serve the bandwidth intensive applications when resource is not sufficient in the optical network. At the same time, most of the connections require bandwidth smaller than the capacity available in a wavelength, leading to low resource utilization of established light-paths. Leveraging multipath routing and dynamic grooming can efficiently utilize the residual capacity of the under-used wavelengths [.We inherit the concept of dynamic traffic grooming in optical network. We were able to develop a Windows XP load balancer. We designed some experiments to evaluate the performance of our system to determine if our system was capable of achieving the load balance. The solution will allow enterprises and service providers to reach load balancing purposes without adding additional hardware by utilizing an idle, low cost switch.

scholarly journals Multi-Twin-SSB Modulation with Direct Detection Based on Kramers–Kronig Scheme for Long-Reach PON Downstream

2019 ◽  
Vol 9 (4) ◽  
pp. 748 ◽  
Author(s):  
Xiang Gao ◽  
Yuancheng Cai ◽  
Bo Xu ◽  
Xiaoling Zhang ◽  
Kun Qiu
Keyword(s):  
Optical Networks ◽  
Forward Error Correction ◽  
Direct Detection ◽  
Chromatic Dispersion ◽  
Optical Network ◽  
Single Mode ◽  
System Optimization ◽  
Single Mode Fiber ◽  
High Data ◽  
Multi Band

As the demand for high data volumes keeps increasing in optical access networks, transmission capacities and distance are becoming bottlenecks for passive optical networks (PONs). To solve this problem, a novel scheme based on multi-twin single sideband (SSB) modulation with direct detection is proposed and investigated in this paper. At the central office, two SSB signals are generated simultaneously with the same digital-to-analog converters (DACs). The twin-SSB signal is not only robust against frequency selected power fading introduced by chromatic dispersion (CD), but also improves the spectral efficiency (SE). By combining a twin-SSB technique with multi-band carrier-less amplitude/phase modulation (multi-CAP), different optical network units (ONUs) can be supported by flexible multi-band allocation based on software-reconfigurable optical transceivers. The Kramers–Kronig (KK) scheme is adopted on the ONU side to effectively mitigate the signal–signal beat interference (SSBI) induced by the square-law detection. The proposed system is extensively studied and validated with four sub-bands using 50 Gbps 16 quadrature amplitude modulation (QAM) modulation for each sub-band using numerical simulations. Digital pre-equalization is introduced at the transmitter-side to balance the performance of different ONUs. After system optimization, a bit error rate (BER) threshold for hard decision forward error correction (HD-FEC) code with 7% redundancy ratio (BER = 3.8 × 10−3) can be reached for all ONUs over 50-km standard single-mode fiber.

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