Power margin improvement for OFDMA-PON using hierarchical modulation

Cao, Pan; Hu, Xiaofeng; Zhuang, Zhiming; Zhang, Liang; Chang, Qingjiang; Yang, Qi; Hu, Rong; Su, Yikai

doi:10.1364/oe.21.008261

Cited by 17 publications

(8 citation statements)

References 20 publications

(19 reference statements)

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“…The RRUs are divided into several groups according to different SNR requirements caused by different transmission capacities or distances. Similar to [9][10], a lower SNR required RRU is paired with another higher required one.…”

Section: B Hm Based Delta-sigma Modulation Mfhmentioning

confidence: 99%

“…Similarly, HM adaptively adjusts the signal quality of the two links within a group according to the user demands. It has been reported to be applied in OFDM passive optical network (PON) with a 2.7 dB power margin improvement [9]. What's more, HM has also been proved with PAM4 format in PON downstream systems to increase network power budget by 3.5 dB [10].…”

Section: Introductionmentioning

confidence: 99%

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A Hierarchical Modulation Enabled SNR Allocable Delta-Sigma Digital Mobile Fronthaul System

et al. 2022

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Internet of everything is being build up rapidly, which causes much higher requirements towards the flexibility of communication resources, especially the adaptivity of the fronthaul to various transmission distances and capacities. In this paper, we proposed a low-cost and spectrum efficient 5G fronthaul broadband connection solution that combines hierarchical modulation technology and delta-sigma modulation. The proposed scheme can double the number of accesses without occupying extra wavelengths. Moreover, such architecture can flexibly allocate the SNR of a group of remote radio units for different user requirement of transmission rate and reaches. Simulation results show that the proposed scheme can increase the access distance of the fronthaul network by 23% and the capacity by 16.7%. The feasibility of the solution is verified through a proof-of-concept experiment. After 20 km transmission, the OFDM-64QAM and -256QAM signal with a center frequency of 3.5 GHz and a bandwidth of 500 MHz can meet the EVM requirements of 8% and 3.5%, respectively. And when the 𝐑 𝑳𝑴 of the hierarchical PAM4 signal is 0.6, the ROP required by the most-significant bit branch can be reduced by ~1.5 dB.

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Section: B Hm Based Delta-sigma Modulation Mfhmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Hierarchical Modulation Enabled SNR Allocable Delta-Sigma Digital Mobile Fronthaul System

et al. 2022

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“…It might be challenging to implement flexible and superior performance to improve throughput for ONUs. We can apply the hierarchical modulation (HM) [7] to transfer different classes of data in PON simultaneously. The HM is one of the techniques for multiplexing and modulating multiple data streams into one single symbol stream, where those multiple symbols are superimposed together before transmission.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of joint hierarchical modulation and physical layer network coding for next passive optical networks

Feng¹,

Li²,

Luo³

2023

Advanced Optical Manufacturing Technologies and Applications 2022; And 2nd International Forum of Young Scientists on Advanced

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In order to fulfill the traffic localization, the network coding (NC) paradigm is a promising approach that can significantly improve the throughput, end-to-end (E2E) delay, and energy efficiency for passive optical network (PON).On the other hand, more recently, the hierarchical modulation (HM) incorporates with advanced digital signal processing (DSP) technology can optimize the total available capacity of PON. In this paper, in order to optimize the network performance, we propose a joint physical layer NC (PLNC) and HM in PON. Subsequently, we evaluate the bit error rate (BER) of M-QAM modulated PLNC that uses the proposed mapping scheme. Afterwards, as an application, a rate adaptation scheme for the method of PLNC is proposed. Simulation results show that combined HM and PLNC mechanism has better BER in OFDM-PON than the conventional NC. Meanwhile, the rate-adaptive PLNC is advantageous in various scenarios.

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“…In recent years, various technologies in software and hardware layers have been proposed to improve the energy efficiency, including dynamic topology optimization for network topologies, adaptive link rate for wired access networks and hybrid hierarchical base station deployment for wireless access networks etc [5]. Recently, there have been many studies on how to improve the energy-efficiency of the SR-ONs, such as [6][7][8][9][10][11][12]. In [6,7], sleep/doze strategies of optical network units (ONUs) are employed for the energy-efficient passive optical networks (PONs).…”

Section: Introductionsmentioning

confidence: 99%

“…The bandwidth can be allocated dynamically to fit the traffic transmission. In [8], hierarchical modulation is proposed to improve the power margin of ONUs far from the optical line terminal (OLT). Energy-efficient physical topologies for the optical transport networks (e.g.…”

Section: Introductionsmentioning

confidence: 99%

Advanced modulation formats for 400-Gbps short-reach optical inter-connection

et al. 2015

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Besides the long-haul optical networks covering over thousands of kilometers for backbone transmission, short reach optical networks (SR-ONs) are widely deployed in metro-area for aggregation and accessing. The SR-ONs include the metro optical transport networks (Metro-OTN), optical access networks or other optical inter-connection systems with even shorter distance. As predicted, the growing bandwidth demanding from SR-ONs will be much more than that from the long-haul optical networks in the near future. Besides, there are tremendous amounts of optical terminals and end-users in SR-ONs compared with the long-haul transmission systems and thus will induce large cost and huge energy consumption. So, the power and cost efficiency should be the key consideration for SR-ONs besides the transmission performance. To improve the power and cost efficiency in SR-ONs, advanced modulations and detection techniques based on low power, low cost and integrated optical modulators should be utilized. In this paper, different advanced modulation formats have been discussed. 56Gbps PAM4, 112Gbps poly-binary and 100Gbps DMT that can be used to realize 400-Gbps SR-ONs for different applications have also been demonstrated respectively. In addition, low-cost and low-power opto-electronic components suitable for SR-ONs, the impairments induced by all kinds of defects and bandwidth limitation of opto-electronic components and the corresponding compensation techniques based on DSP algorithms have also been discussed in the experiments.

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Power margin improvement for OFDMA-PON using hierarchical modulation

Cited by 17 publications

References 20 publications

A Hierarchical Modulation Enabled SNR Allocable Delta-Sigma Digital Mobile Fronthaul System

A Hierarchical Modulation Enabled SNR Allocable Delta-Sigma Digital Mobile Fronthaul System

Theoretical analysis of joint hierarchical modulation and physical layer network coding for next passive optical networks

Advanced modulation formats for 400-Gbps short-reach optical inter-connection

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