100-Gb/s TWDM-PON based on 10G optical devices

Li, Zhengxuan; Yi, Lilin; Ji, Honglin; Hu, Weisheng

doi:10.1364/oe.24.012941

Cited by 36 publications

(15 citation statements)

References 8 publications

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“…Two threshold sets { , 0, }  − and { , }  − are tested for the PWL equalizer, which means four or three parallel FFEs are used. A conventional 11-tap FFE (pre-equalizer) is used before the parallel 15-tap FFEs (56 Gb/s) or 51-tap FFEs (84 Gb/s) for PWL equalizer in the experiment to compensate part of the linear distortions due to chromatic dispersion, and to distribute signal around [ 3,1,1,3] −− to facilitate accurate segmentation. Since the pre-equalizer enables received data to distribute around [ 3,1,1,3] −− , and most of the pre-equalized signals are within the range of [ 4,4] − ,  is varied from 0 to 4 to find the optimum  value for 56 Gb/s over 40 km and 84 Gb/s over 20 km transmission with a fixed ROP of 5.6 dBm, as shown in Fig.…”

Section: A Threshold Setting Optimizationmentioning

confidence: 99%

“…PURRED by the rapid growth of high-bandwidth internet applications such as cloud services, streamed video, and Internet of Things, the bandwidth requirement of intra and inter-data center interconnection (DCI) is continuously increasing. For the DCI applications, the intensity modulation and direct detection (IM/DD) systems have attracted many research interests due to their low cost, small footprint, and simple configuration [1], [2]. Several advanced modulation formats have been proposed for the IM/DD system, such as pulse-amplitude-modulation with four amplitude levels (PAM-4), discrete multi-tone modulation (DMT), and carrier-less amplitude-phase modulation (CAP) [3], [4].…”

Section: Introductionmentioning

confidence: 99%

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Piecewise Linear Equalizer for DML Based PAM-4 Signal Transmission Over a Dispersion Uncompensated Link

Kong

Xin

et al. 2020

J. Lightwave Technol.

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Directly modulated laser (DML) and direct detection (DD) based pulse-amplitude modulation (PAM) for short reach optical communications has attracted lots of research interests due to its low cost and simple configuration. However, the directly modulated PAM signal usually suffers from distortions after the transmission over a dispersion uncompensated link. Due to the adiabatic chirp of the DML working in a high output power region, different intensity levels of the PAM signal correspond to different frequency offsets, thus resulting in amplitude-dependent skew after the transmission over a dispersion uncompensated link. It will degrade signal quality and limit transmission distance. In this paper, we, for the first time, propose a computational efficient piecewise linear (PWL) equalizer to correct the amplitude-dependent skew due to the interaction between the DML chirp and chromatic dispersion in the fiber. By using the PWL equalizer, the amplitude-dependent skew is corrected, and we successfully transmit 56 Gb/s PAM-4 signal over 40 km and 84 Gb/s PAM-4 signal over 20 km dispersion uncompensated link in the C band, with a bit error ratio (BER) below the HD-FEC threshold (3.8×10 -3 ). To demonstrate the low computational complexity of the PWL, we compare its complexity with 2 nd order Volterra equalizer for a similar BER performance. The results show that the computational complexity can be reduced by 61.4% and 40.4% for the 56 Gb/s and 84 Gb/s PAM-4 signal transmission, respectively.

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Section: A Threshold Setting Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Piecewise Linear Equalizer for DML Based PAM-4 Signal Transmission Over a Dispersion Uncompensated Link

Kong

Xin

et al. 2020

J. Lightwave Technol.

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“…Another important parameter that influences the performance of the nematic LCs is the temperature. According to Clausius-Mossotti and Lorentz-Lorenz equations the temperature dependency of the nematic LCs' birefringence is expressed as follows [57]:…”

Section: The Problem Definition and Nematic Lcs As A Tool For Active mentioning

confidence: 99%

Active beam steering and afocal zooming by nematic liquid crystal-infiltrated graded index photonic structures

Babayigit

Kurt

Turduev

2019

J. Phys. D: Appl. Phys.

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This study presents active beam steering and afocal zooming of light by incorporating liquid crystals (LCs) with graded index photonic crystal (GRIN PC). The GRIN PC structures are composed of low refractive index polymer annular rods having gradually varied radii of holes. To actively manipulate incident light, the annular rods are infiltrated with nematic LCs. By applying an external voltage to the infiltrated LCs, the effective index profile of the low-index GRIN PC structure is modulated without introducing any mechanical movement. The incident beam deflection and corresponding focal distance modulation are tuned only by controlling the applied bias voltage. In the present work, hyperbolic secant refractive index profile is chosen to design GRIN PC structures. To design GRIN PC structure with annular PCs, Maxwell-Garnett effective medium approximation is employed. Moreover, we analytically express the relation between infiltrated LCs and gradient parameter to show the physical background of the tuning ability of the proposed devices. Also, beam steering and afocal zooming devices are analytically investigated via geometrical optics and numerically realized with the help of the finite-difference time-domain method. A beam deflection with an angle change of Δθout= 44° and a light magnification with maximum x2.15 are obtained. LCs are inexpensive materials and work under low voltage/power condition. This feature can be used for designing an electro-optic GRIN PC device that can be useful in various optical applications.

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“…The work [6] experimentally demonstrates the modulation, fibre transmission and reception of 25 Gbit/s signal on 10G optical devices for three types of modulation NRZ, PAM4 and ODB. Concerning the cost of application, dispersion and loss of budget, NRZ came out as the recommended modulation mainly for its maturity, best launch power and receiver sensitivity and cost.…”

Section: Related Workmentioning

confidence: 99%

High Speed (100G) Access Networks

Horváth

Chlapek

Münster

et al. 2018

JCOMSS

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Abstract-Passive optical networks are currently the most promising solution for access networks. Increasing bandwidth requirements and big data applications need a huge bandwidth. Nowadays, gigabit passive optical networks do not seem to be suitable for these purposes. This paper is focused on describing the development, parameters and needs for High Speed Access Networks (such as 100G EPON). The simulations with current wavelengths plans are presented. For simulations we used VPITransmissionMaker TM 9.7. Our goal was to create a rudimentary bidirectional PON system with one ONU and do several simulation scenarios by artificially increasing loss in a splitter for simulating more ONUs. Our following results consist of BER values and eye diagrams for each simulation scenario and proof that 100G EPON networks are most promising networks for the future. We proved that the 100G-EPON networks fully support the basic and currently used split ratios. We also created a two-way communication model and evaluated the obtained data from the bit error-rate and system reach point of view. The entire model was compared with the final version of NG-PON2.

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100-Gb/s TWDM-PON based on 10G optical devices

Cited by 36 publications

References 8 publications

Piecewise Linear Equalizer for DML Based PAM-4 Signal Transmission Over a Dispersion Uncompensated Link

Piecewise Linear Equalizer for DML Based PAM-4 Signal Transmission Over a Dispersion Uncompensated Link

Active beam steering and afocal zooming by nematic liquid crystal-infiltrated graded index photonic structures

High Speed (100G) Access Networks

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