Dual-Polarized WDM Access Network With Fiber to the Extension (FTTE) Connection

Abstract

In this study, a symmetric polarization-division-multiplexing (PDM) wavelength-division-multiplexing passive optical network (WDM-PON) with fiber to the extension (FTTE) architecture is presented and investigated. The proposed PON can also avoid the Rayleigh backscattering (RB) interference noise. Here, each WDM wavelength can produce 25 Gbit/s on-off keying (OOK) and 10 Gbit/s OOK modulation channels simultaneously in x-and y-polarizations (Polx and Poly) through PDM method for 25 and 105 km single-mode fiber (SMF) transmissions without dispersion compensation. The measured minimal power budget of 25 and 10 Gbit/s downstream and upstream signals are 29 and 35.1 dB and 29.8 and 31.5 dB, respectively, at the forward error correction (FEC) target. Therefore, the proposed PDM WDM-PON architecture can not only offer symmetric 35 Gbit/s downstream and upstream connections by the dual-polarized wavelength, but also can avoid the RB-induced interference noise. In addition, the presented dualpolarized downstream signal also can provide information security in physical layer, when the unauthorized user occupies unlawfully.

A High Spectral Efficient Frequency-Domain Channel-Estimation Method for the Polarization-Division-Multiplexed CO-OFDM-OQAM System

“…x x y y p p p p satisfy the conditions presented in Equation ( 8) and Equation (9). Therefore, Equation ( 10) can be rewritten as follows:…”

“…This phenomenon affects the channel estimation process of the OFDM-OQAM systems. Therefore, the influence of IMI and polarization mode dispersion (PMD) should also be considered in addition to the influence of chromatic dispersion and noise, especially in case of PDM CO-OFDM-OQAM [9]. Consequently, the design of channel estimation algorithms is relatively difficult [10] [11].…”