基于极化交织的光学MIMO-SCFDM-PON传输

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"Optical MIMO transmission for SCFDM-PON based on polarization interleaving" 这篇论文探讨了在单载波频率分复用（SCFDM）无源光网络（PON）中，基于极化交织的光学多输入多输出（MIMO）传输技术，以解决未来高速PON接入的问题。OFDM-PON和SCFDM-PON被广泛认为是未来高带宽PON接入的可行方案。其中，OFDM-PON利用正交频分复用技术，可以有效地提高数据传输速率和系统容量，但对光组件的带宽要求较高。文章提出了一种适用于OFDM-PON的极化分复用方案，其目的是显著降低组件的带宽需求。该方案依赖于两个正交边带的频谱重叠，以及一个4x4的MIMO算法。极化分复用是一种利用光信号在不同极化状态下的独立性来增加信道容量的技术，通过这种方式，可以在同一光纤中同时传输两个独立的数据流，从而提高系统的整体效率。然而，这个方案的实施需要严格满足两个正交边带的频谱重叠条件，这是为了确保MIMO系统能够正确地分离和解码接收到的信号。4x4 MIMO算法则用于处理这种多输入多输出系统中的信号干扰问题，通过复杂的矩阵运算，它可以恢复出在传输过程中由于多径效应和干扰而失真的信号。此外，文章可能还详细讨论了如何实现极化交织，这是一种用于随机化极化状态的技术，以减少因极化相关效应导致的信道相关性和性能下降。通过极化交织，可以进一步提高系统的抗干扰能力和传输可靠性。论文作者来自北京大学的国家重点实验室，他们的研究工作可能包括了理论分析、实验设计以及实际系统性能的评估。文章的接收和发布日期表明，这项研究是在2012年进行的，反映了当时对高效PON技术的前沿探索。这篇论文关注的是如何通过创新的极化分复用和MIMO技术来优化OFDM-PON和SCFDM-PON系统的性能，降低硬件要求，同时提高数据传输的稳定性和效率，这对于构建未来的高速光接入网络具有重要意义。

COL 10(12), 120602(2012) CHINESE OPTICS LETTERS December 10, 2012

Optical MIMO transmission for SCFDM-PON based on

polarization interleaving

Bangjiang Lin (

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), Juhao Li (

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)

∗

, Hui Yang (

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), Lixin Zhu (

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###

Yongqi He (

ÛÛÛ

[[[

jjj

), and Zhangyuan Chen (

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ÙÙÙ

)

∗∗

State Key Laboratory of Advanced Optical Communication Systems and Networks,

Peking University, Beijing 100871, China

∗

Corresponding author: juhao li@pku.edu.cn;

∗∗

corresponding author: chenzhy@pku.edu.cn

Received April 21, 2012; accepted July 10, 2012; posted online October 24, 2012

Orthogonal frequency division multiplexing-passive optical network (OFDM-PON) and single-carrier fre-

quency division multiplexing (SCFDM)-PON are promising solutions for future high-speed PON -based

access. A polarization division multiplexing scheme with direct detection is proposed for OFDM-PO N to

effectively reduce bandwidth requirements for components. However, the scheme strictly requires spec-

trum overlapping of two orthogonal sidebands and the 4×4 multi-input-multi-output (MIMO) algorithm to

eliminate complex cross-polarization interference. In this letter, we propose a polarization interleaving (PI)

approach that significantly reduces bandwidth requirements for optical and electrical components while

achieving a high-ﬂexibility and low-complexity MIMO algorithm. Downstream single sideband PI-SCFDM

transmission is experimentally demonstrated.

OCIS codes: 060.2330, 060.4250.

doi: 10.3788/COL201210.120602.

In the future, next-generation optical access networks

will migrate to a capac ity of 40 Gb/s or even higher per

channel. Passive optical networks (PONs) based on or-

thogonal frequency division multiplexing (OFDM) and

single-carrier frequency division multiplexing (SCFDM)

have recently received considerable attention because

these networks present strong resistance to fiber disper-

sion, high spectral efficiency, and extreme ﬂexibility in

terms of multiple service acce ss and dynamic bandwidth

allocation

[1−9]

. SCFDM is a modified form of OFDM.

Given its inherent single-carrier transmission character-

istics, it has a lower peak-to-average ratio than does

OFDM. Exper iments have shown that SCFDM exhibits

better performance

[10]

The polarization division multiplexing (PDM) OFDM-

PON scheme with direct detection has recently

been proposed to reduce ba ndwidth requirements for

components

[11−13]

. However, the scheme strictly requires

sp e ctrum overlapping of two orthogonal sideba nds and

the 4×4 multi-input-multi-output (MIMO) channel esti-

mation algorithm to eliminate complex cross -polarization

interference. In this letter, we propose a polarization in-

terleaving (PI) appro ach for SCFDM-PO N based on di-

rect detection. This approach significantly reduces band-

width requirements for optical and electrical components

while achieving a similar 2×2 MIMO algorithm with

PDM coherent optical (CO) OFDM

[14]

. Downstream PI-

SCFDM-PON is experimentally demonstrated to show

the feasibility of the proposed scheme. Compared with

PDM, the PI scheme realizes a high- ﬂexibility and low-

complexity MIMO algorithm at the cost of slightly re-

duced spectral efficiency. The MIMO algorithm can be

easily e xtended to OFDM-PON.

Figure 1 shows the schematic of the proposed PI ap-

proach. At the transmitter, an intensity modulator (IM)

is dr iven by a radio frequency (RF) f

/2 with carrier sup-

pression to generate two optical carriers with frequency

spacing f

. Then, an interleaver is used to separate the

two carriers. Fo r each SCFDM transmitter, the ba seband

SCFDM s ignals are up-conve rted by digital or analog IQ

modulation. The up-converted signals can be expr essed

i=1

1,i

(t) exp(j2πf

t), (1)

i=1

2,i

(t) exp(j2πf

t), (2)

where S

1,i

and S

2,i

denote the baseband SCFDM signals

of the ith subcarrier modulated in SCFDM transmitters

1 and 2, respectively; f

is the RF carrier; N is the

number of subcarriers. The electrical SCFDM signals

are converted to optical double sideband (DSB) signals

by optical IMs. Figures 1(a) and (b) show the schematic

outputs of the two IMs. Then, the signals are combined

Fig. 1. Architecture of PI-SCFDM-PON. PC: polarization

controller.

1671-7694/2012/120602(4) 120602-1

 2012 Chinese Optics Lett ers

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