scholarly journals DSP-Based 40 GB/s Lane Rate Next-Generation Access Networks

2018 ◽  
Vol 10 (12) ◽  
pp. 118 ◽  
Author(s):  
Jinlong Wei ◽  
Ji Zhou ◽  
Elias Giacoumidis ◽  
Paul Haigh ◽  
Jianming Tang
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Digital Signal ◽  
Pulse Amplitude ◽  
Network Capacity ◽  
Access Networks ◽  
Next Generation ◽  
Efficient Manner ◽  
Continuous Growth ◽  
Modulation Format

To address the continuous growth in high-speed ubiquitous access required by residential users and enterprises, Telecommunication operators must upgrade their networks to higher data rates. For optical fiber access networks that directly connect end users to metro/regional network, capacity upgrade must be done in a cost- and energy-efficient manner. 40 Gb/s is the possible lane rate for the next generation passive optical networks (NG-PONs). Ideally, existing 10 G PON components could be reused to support 40 Gb/s lane-rate NG-PON transceiver, which requires efficient modulation format and digital signal processing (DSP) to alleviate the bandwidth limitation and fiber dispersion. The major contribution of this work is to offer insight performance comparisons of 40 Gb/s lane rate electrical three level Duobinary, optical Duobinary, and four-level pulse amplitude modulation (PAM-4) for incorporating low complex DSPs, including linear and nonlinear Volterra equalization, as well as maximum likelihood sequence estimation. Detailed analysis and comparison of the complexity of various DSP algorithms are performed. Transceiver bandwidth optimization is also undertaken. The results show that the choices of proper modulation format and DSP configuration depend on the transmission distances of interest.

scholarly journals Systematic Performance Comparison of (Duobinary)-PAM-2,4 Signaling under Light and Strong Opto-Electronic Bandwidth Conditions

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 81
Author(s):  
Ramón Gutiérrez-Castrejón ◽  
Md Ghulam Saber ◽  
Md Samiul Alam ◽  
Zhenping Xing ◽  
Eslam El-Fiky ◽  
...  
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Performance Comparison ◽  
Sampling Point ◽  
Bit Rate ◽  
Performance Limits ◽  
Specific System ◽  
Rate System ◽  
Modulation Formats ◽  
Modulation Format

We present a systematic comparison of PAM-2 (NRZ), Duobinary-PAM-2, PAM-4, and Duobinary-PAM-4 (duo-quaternary) signaling in the context of short-reach photonic communications systems using a Mach–Zehnder modulator as transmitter. The effect on system performance with a relaxed and constrained system’s opto-electronic bandwidth is analyzed for bit rates ranging from 20 to 116 Gb/s. In contrast to previous analyses, our approach employs the same experimental and simulation conditions for all modulation formats. Consequently, we were able to confidently determine the performance limits of each format for particular values of bit rate, system bandwidth, transmitter chirp, and fiber dispersion. We demonstrate that Duobinary-PAM-4 is a good signaling choice only for bandwidth-limited systems operating at relatively high speed. Otherwise, PAM-4 represents a more sensible choice. Moreover, our analysis put forward the existence of transition points: specific bit rate values where the BER versus bit rate curves for two different formats cross each other. They indicate the bit rate values where, for specific system conditions, switching from one modulation to another guarantees optimum performance. Their existence naturally led to the proposal of a format-selective transceiver, a component that, according to network conditions, operates with the most adequate modulation format. Since all analyzed modulations share similar implementation details, signaling switching is achieved by simply changing the sampling point and threshold count at the receiver, bringing flexibility to IM/DD-based optical networks.

Electrical Spreading Code-Based OFDM Optical Access Networks for Budget Enhancement and Reduced System Bandwidth Requirement

2015 ◽  
Vol 36 (4) ◽  
Author(s):  
Pravindra Kumar ◽  
Anand Srivastava
Keyword(s):  
Optical Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Optical Network ◽  
Access Networks ◽  
Passive Optical Network ◽  
Spreading Code ◽  
Optical Access Networks ◽  
Optical Access ◽  
Code Division Multiple

AbstractPassive optical networks based on orthogonal frequency division multiplexing (OFDM-PON) give better performance in high-speed optical access networks. For further improvement in performance, a new architecture of OFDM-PON based on spreading code in electrical domain is proposed and analytically analyzed in this paper. This approach is referred as hybrid multi-carrier code division multiple access-passive optical network (MC-CDMA-PON). Analytical results show that at bit error rate (BER) of 10

Packaging Tradeoff for SIP Integration Targeting High Speed PAM-4 Applications

2015 ◽  
Vol 2015 (1) ◽  
pp. 000730-000734
Author(s):  
B Haentjens ◽  
G Desruelles ◽  
G Chrétien ◽  
A Leborgne ◽  
Y Haentjens ◽  
...  
Keyword(s):  
System Integration ◽  
High Speed ◽  
Pulse Amplitude ◽  
Electronic System ◽  
Design Flow ◽  
Ultra Wideband ◽  
Optical Modulators ◽  
Eye Diagram ◽  
Modulation Format ◽  
Bga Package

High speed transmission systems using optical fiber are now focusing on 4-level PAM (Pulse Amplitude Modulation) format. This is requesting ultra-wideband electronic system in package, with a high phase linearity behavior in order to drive the electro-optical modulators. Moreover, new power DAC (Digital to Analog Converter) dies, are now available to generate up to 56 GBd, 4-level PAM signals, and providing 4Vpp of differential output amplitude swing. High frequency studies have been pursued to provide system integration in a BGA (Ball Grid Array) package. The BGA package transitions optimization and the configuration of multi-lines carriers, becomes a key step in the design flow. In this paper, some steps of the design, manufacturing process of the SIP (System In Package) and its demonstration board are proposed. The choices of the package, the thermal management, the clock management function are studied according to the final environmental constraint of the SIP. The data lines phase skew are analyzed with the support of EM (Electro Magnetic) simulations to better understand the potential impact on the output eye. Finally, the BGA package transition, simulated and measured results are compared, from DC up to 40 GHz and the measured SIP output, 4 levels, 56GBps eye diagram is presented.

scholarly journals Performance Analysis of Translucent Space Division Multiplexing Based Elastic Optical Networks

2019 ◽  
Vol 8 (1) ◽  
pp. 8
Author(s):  
Sridhar Iyer ◽  
Shree Prakash Singh
Keyword(s):  
Performance Analysis ◽  
Optical Networks ◽  
Single Mode ◽  
Network Capacity ◽  
Single Mode Fiber ◽  
Modulation Formats ◽  
Modulation Format ◽  
Space Division Multiplexing ◽  
Space Division ◽  
Online Traffic

The required upgradation of the network capacity of the single-mode fiber which is constrained by the non-linear Shannon’s limit, and the capacity provisioning needed by the future diverse Internet traffic can be resolved by the adoption of the Space Division Multiplexing (SDM) based Elastic Optical Networks (EONs) (SDM-b-EONs). In the current work, we focus on the performance analysis of a SDM-b-EON in which translucent lightpaths are routed through the spectral super-channels over the spatial single-mode fiber(s) bundle(s) links. In regard to regeneration, we investigate three scenarios which differ in their regeneration variability level in addition to the adjustment of modulation formats according to transmission route characteristics. We conduct extensive simulations considering an online traffic case and two realistic network topologies with different numbers of (i) fibers in every link, and (ii) transceivers available within SDM-b-EON. The obtained results demonstrate that when regeneration is conducted with complete flexibility and simultaneously the modulation format conversion is also permitted at every SDM-b-EON node both, largest traffic volume amounts can be provisioned, and significant SDM-b-EON performance scaling can be obtained with a corresponding increase in the utilized fibers amount.

A high-speed micro-ring modulator for next generation energy-efficient optical networks beyond 100 Gbaud

2021 ◽  
Author(s):  
Meer Sakib ◽  
Peicheng Liao ◽  
Chaoxuan Ma ◽  
Ranjeet Kumar ◽  
Duanni Huang ◽  
...  
Keyword(s):  
Optical Networks ◽  
Energy Efficient ◽  
High Speed ◽  
Next Generation ◽  
Ring Modulator

Non-data-aided joint bit-rate and modulation format identification for next-generation heterogeneous optical networks

2014 ◽  
Vol 20 (2) ◽  
pp. 68-74 ◽  
Author(s):  
Faisal Nadeem Khan ◽  
Yudi Zhou ◽  
Qi Sui ◽  
Alan Pak Tao Lau
Keyword(s):  
Optical Networks ◽  
Next Generation ◽  
Bit Rate ◽  
Modulation Format

scholarly journals Optical Power Budget of 25+ Gbps IM/DD PON with Digital Signal Post-Equalization

2020 ◽  
Vol 10 (17) ◽  
pp. 6106
Author(s):  
Aleksejs Udalcovs ◽  
Toms Salgals ◽  
Lu Zhang ◽  
Xiaodan Pang ◽  
Anders Djupsjöbacka ◽  
...  
Keyword(s):  
Optical Networks ◽  
Direct Detection ◽  
Optical Power ◽  
Digital Signal ◽  
Single Mode ◽  
Pulse Amplitude ◽  
Power Splitting ◽  
Power Budget ◽  
Sustainable Solutions ◽  
The Impact

While infrastructure providers are expanding their portfolio to offer sustainable solutions for beyond 10 Gbps in the access segment of optical networks, we experimentally compare several modulation format alternatives for future passive optical networks (PONs) aiming to deliver 25+ Gbps net-rates. As promising candidates, we consider the intensity modulation direct detection (IM/DD) schemes such as electrical duobinary (EDB) and 4-level and 8-level pulse amplitude modulations (PAM-4/8). They are more spectrally efficient than the conventional non-return-to-zero on-off-keying (NRZ-OOK) used in current 10G PONs. As we move to higher rates, digital equalization enhances the performance by smoothening the systems imperfection. However, the impact that such equalization has on the optical power budget remains unclear. Therefore, in this article, we fairly compare the optical power budget values of a time division multiplexed PON (TDM-PON) exploiting a linear digital signal equalization at the receiver side. We consider the conventional PON configuration (20 km of single-mode fiber (SMF), 1:N optical power splitting) with IM/DD and net-rates above 25 Gbps. Furthermore, we focus on a downstream transmission imposing the bandwidth limitations of 10G components using a digital filter before the detection. The obtained results show that the use of a digital post-equalization with 43 feed-forward (FF) and 21 feedback (FB) taps can significantly improve the signal quality enabling new alternatives and enhancing the optical power budget.

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