SSB调制在LR-PON中缓解多频段OFDM-UWB信号传输功率衰落的比较

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"这篇研究论文探讨了在长距离无源光网络（LR-PON）中，多频带正交频分复用（OFDM）超宽带（UWB）信号传输时，功率衰落缓解技术的性能比较。文章特别关注了单边带（SSB）调制方法，以此来减轻由于色散引起的功率衰减问题。文中提到了两种不同的SSB架构，即Sieben的架构和四相调制器（FPM）架构，并优化它们以实现最大程度的边带抑制。研究中还确定了同时沿LR-PON传输所有14个OFDM-UWB子带所需的最低光学信噪比（OSNR）要求，这些距离范围从20公里到40公里不等。" 这篇研究论文深入分析了在LR-PONs中传输OFDM-UWB信号时所面临的功率衰落问题。OFDM-UWB技术是一种结合了OFDM的高数据传输能力与UWB的低功率、宽频谱分布优势的通信方式，但当信号在长距离无源光网络中传播时，会受到色散效应导致的功率衰减，这降低了信号的质量和可接收性。 SSB调制作为解决此问题的一种手段，其基本思想是仅保留信号的一个边带，从而减少功率损耗并提高信噪比。文章中比较了两种不同的SSB架构：Sieben的架构和FPM架构。Sieben的架构通常涉及到镜像抑制混频器，通过这种方式可以有效地消除不需要的边带。而FPM架构则利用四个相位调制器来实现SSB调制，这种方法可能具有更高的灵活性和效率。通过对这两种架构的优化，研究者找到了最大限度抑制边带的方法，这对于保持信号的完整性和减少功率损失至关重要。同时，他们计算出了在不同距离下，维持信号质量所需的最低OSNR。OSNR是衡量信号质量的重要指标，它反映了信号功率与噪声功率的比例。在本文中，OSNR的计算考虑了整个LR-PON网络的长度范围，从20公里到40公里，这对于理解实际网络部署中的性能表现至关重要。通过这样的对比研究，该论文不仅提供了理论分析，也给出了实际应用的指导，有助于设计更有效的UWB通信系统，特别是在长距离无源光网络环境下的应用。这有助于提升未来宽带无线通信系统的可靠性和效率，特别是在高速数据传输和物联网(IoT)应用中。

COL 11(8), 080602(2013) CHINESE OPTICS LETTERS August 10, 2013

Performance comparison of power fading mitigation

techniques in multiband OFDM-UWB signals

transmission along LR-PONs

Tiago M. F. Alves

∗

and Adolfo V. T. Cartaxo

Instituto de Telecomunica¸c˜oes, Department of Electrical and Computer Engineering,

Instituto Superior T´ecnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal

∗

Corresponding author: tiago.alves@lx.it.pt

Received February 15, 2013; accepted April 12, 2013; posted online July 26, 2013

The single sideband (SSB) mod ulation is assessed as a means to mitigate the dispersion-induced power

fading on the distribution of ortogonal frequency div ision multiplexing (OFDM) ultra wideband (UWB)

radio signals along long-reach passive optical networks (LR-PONs). Particularly, two different SSB ar-

chitectures, namely, Sieben’s architecture and four phase modulator (FPM) architecture are optimized to

provide maximum sideband suppression. The minimum optical signal-to-noise ratio (OSNR ) required to

simultaneously distribute all the 14 OFDM-UWB sub- bands along the LR-PON d istances ranging between

80 and 100 km is also evaluated through numerical simulation. FPM architecture is preferable over Sieben’s

architecture because the latter SSB architecture generates carriers-carriers beat term at the photodetector

output with high power, thereby causing significant degradation in the OFDM-UWB sub-bands with lower

central frequencies. The simultaneous distribution of the 14 SSB OFDM-UWB sub-bands in the LR-PON

using the FPM architecture shows a minimum OSNR penalty of 3 dB compared with the centralized dis-

persion compensation technique.

OCIS codes: 060.0060, 060.2330.

doi: 10.3788/COL201311.080602.

The tra ns mission performance impairments of ultra wide-

band (UWB) radio signals in optical fiber access in-

frastructures is a hot resea rch topic

[1−4]

. Among the

different transmission impa irments, the fiber dispersion-

induced power fading is identified as one of the most

restrictive limitations on the performance of double

sideband (DSB) ortogonal frequency-division multi-

plexing (OFDM) UWB signal transmissio n in intensity

modulation-direct detection systems

[5]

Several techniques were proposed to mitigate the disp-

ersion-induced power fading. The most interesting tech-

niques from complexity and performance view-

points are based on single sideband (SSB) modul-

ation

[4]

, chirped electro-optic modulators (EOMs)

[6]

, and

centralized optical dis persion compensation (DC)

[7]

The solution based on chirped EOMs showed rea -

sonable tolerance to power fading degradation when

the first three UWB sub-bands were transmitted

simultaneously

[6]

When SSB modulation of OFDM-UWB radio signals

is employed, the power fading limitation is avoided be-

cause only a signal sideband is transmitted. The main

disadvantage of SSB modulation is that, if a wavelength

division multiplexing (WDM) technique is used to de-

liver the UWB services to different users with acceptable

bandwidth requirements in both the optical line termi-

nation (OLT) and optical network units (ONUs)

[8]

, one

EOM structure per user is require d and the cost of the

SSB modulation cannot be sha red among all the us e rs

served by the OLT.

If the DC is performed at the OLT or at the remote

node (RN) of the LR-PON, its implementation cost may

be shared by all the users served by the OLT, thus

making it an attractive solution for the network ope ra-

tors. However, the implementation of DC LR-PONs is

also challenging. For instance, giving tha t the dispersion

compensator can fully compensate for the dispersion only

for an ONU located at a given distance fro m the OLT,

other ONUs still suffer from p ower fading degradatio n

induced by the residual dis persion of the network

[7]

Despite the different advantages and drawbacks of the

aforementioned SSB modulation and DC techniques, the

comparison o f the transmission performance of multi-

band OFDM-UWB radio signals along LR-PONs em-

ploying these two techniques has yet to be performed.

Hence, in this letter, the transmission of SSB OFDM-

UWB radio signa ls as a solution to overcome the disper-

sion impairment of LR-PONs is assessed by numerical

simulation, while considering the simultaneous transmis-

sion of the 14 UWB sub-bands. Additionally, the per-

formance obtained when SSB OFDM-UWB radio signals

are transmitted is compared with that achieved when

optical DC is employed, fr om which the most promising

solution from the technical viewpoint is identified.

Several EOMs architectures were proposed to gener-

ate SSB signals

[9−11]

. Some of these architectures are

remarka bly complex and expensive and, consequently,

are not the most ideal options for use in access net-

works. Hence, in this letter, only the following (simpler)

SSB architectures are investigated: i) the one proposed

in Ref. [10], which uses one Mach-Zehnder modulator

(MZM) followed by a phase-modulator (PM); ii) the

one proposed in Ref. [11], consisting of a MZM with a

MZM inse rted in each arm. Henceforth, the fo rmer is

designated by Sieb e n’s architecture, while the latter is

designated by four phase modulator (FPM) architecture.

1671-7694/2013/080602(6) 080602-1

 2013 Chinese Opt ics Letters

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