瑞利反向散射噪声消除技术在长距离WDM

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120

China Communications • April 2017

I. INTRODUCTION

The full-duplex transmission on single-feeder

fiber based on the reflective semiconductor

optical amplifier (RSOA) has become the

main solution for wavelength-division-mul-

tiplexing passive optical networks (WDM-

PON), in which the colorless optical network

unit (ONU) and mitigation of optical beat

interference (OBI) noise caused by Rayleigh

backscattering are critical technologies. One

method uses an extra centralized continuous

wave (CW) light source in optical line termi-

nal (OLT) which is modulated at ONU as the

seed of upstream (US) data, but it will increase

the cost and introduce more OBI noises. In

the other method, the downstream (DS) signal

is used as the seed source after removing the

modulated signal by gain-saturation RSOA.

Then the US data is remodulated at the same

wavelength of DS by RSOA. However the

gain-saturated RSOA is not very suitable in

long reach and high speed PON for its limit

in injecting power, extinction ratio(ER) and

remodulation bandwidth [1-4].

The signal’s transmission performance in

a full-duplex fiber is limited by OBI noise

resulting from Rayleigh backscattering and

reection of discrete components[5][6]. From

ref [7-9], the Rayleigh backscattering is spon-

taneous. The backscattered close-in noise

Abstract: We propose and experimentally

demonstrate a novel colorless full-duplex

passive optical network architecture with

Rayleigh backscattering optical beat interfer-

ence (OBI) noise mitigation by using orthog-

onal codes. A pair of orthogonal codes are

generated and transmitted from optical line

terminal (OLT) to optical network unit (ONU)

with the same wavelength, in which, one for

downstream signal coding, and the other for

the upstream seeding signal. In ONU, the up-

stream signal is remodulated without erasing

the downstream signal. Extra centralized CW

light sources and gain-saturation RSOAs are

not needed. By using orthogonal codes, the

spectral overlap between upstream and down-

stream signal is reduced, which can mitigate

OBI noise significantly. The performance of

transmission and power margin are investigat-

ed through experiments at different data rates,

transmission distances compared with normal

on-off keying (OOK) signals. The remodulat-

ed upstream signals are correlatively received

at OLT with coding gain which is useful in

long-reach transmissions. Due to coding gain

and OBI noise mitigation, total 4~9dB power

margin is achieved for 5Gb/s downstream and

1.25Gb/s upstream with 20km to 70km trans-

mission distances.

Keywords: colorless full-duplex passive opti-

cal; obi; orthogonal codes; spectral overlap

Simple Colorless Long-Reach WDM-PON with

Rayleigh Backscattering Noise Mitigation Employing

Remodulated Orthogonal Coding

Zhisheng Li

*

, Qiang Dou, Lei Wang, Peijun Yang, Chaobing Zhou

School of Computer Science, National University of Defense Technology, Changsha,410073, China

*

The corresponding author, email:lizhsh_123@163.com

Received: Mar. 26, 2016

Revised: Sep. 26, 2016

Editor: Weisheng Hu

Fig 1, 3, 5, 6, 7, 9 need vector diagrams, please redo it with

font times new roman 6pt

SIGNAL PROCESSING FOR COMMUNICATIONS

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