Using Downstream DPSK and Upstream Wavelength-Shifted ASK for Rayleigh Backscattering Mitigation in TDM-PON to WDM-PON Migration Scheme

被引：27

作者：

Chow, C. W. ^{[1
,2
]}

Yeh, C. H. ^{[3
]}

机构：

[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30010, Taiwan

[2] Natl Chiao Tung Univ, Inst Electroopt Engn, Hsinchu 30010, Taiwan

[3] Ind Technol Res Inst, Informat & Commun Res Labs, Hsinchu 31040, Taiwan

来源：

IEEE PHOTONICS JOURNAL | 2013年 / 5卷 / 02期

关键词：

Optical communications; noise mitigation; wavelength-division-multiplex passive optical network (WDM-PON); differential phase-shift keying (DPSK); MODULATION;

D O I：

10.1109/JPHOT.2013.2247588

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A migration scheme from time-division-multiplex passive optical network (TDM-PON) to wavelength-division-multiplex PON (WDM-PON) using differential phase-shift keying (DPSK) for the downstream signal and wavelength-shifted amplitude-shift keying (WS-ASK) for the upstream signal is demonstrated. The migration scheme does not change the existing fiber infrastructure. An optical filter is preinstalled at the optical networking unit (ONU) to select the desirable downstream wavelength for the WDM-PON and simultaneously demodulate the downstream DPSK signal. Signal remodulation is used to generate the upstream signal by reusing the downstream wavelength. In the ONU, by wavelength shifting the upstream optical spectrum with respect to the downstream optical spectrum, the Rayleigh backscattering (RB) interference beat noise affecting the upstream signal can be significantly mitigated. The optimum bandwidth for the downstream DPSK demodulation is analyzed. The downstream and upstream transmission performances at different split ratios are also discussed.

引用

页数：7