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Coherent ultra dense wavelength division multiplexing passive optical networks

Shahpari, A. ; Ferreira, RMF ; Ribeiro, V. M. C. ; Sousa, A. Sousa ; Ziaie , S. ; Tavares, A. ; Vujicic , Z. ; Guiomar, F. P. ; Reis, J.D. ; Pinto, A. N. ; Teixeira, A.

Optical Fiber Technology Vol. 26, Nº Part A , pp. 100 - 107, December, 2015.

ISSN (print): 1068-5200
ISSN (online): 1068-5200

Journal Impact Factor: 1,300 (in 2014)

Digital Object Identifier: 10.1016/j.yofte.2015.07.001

Abstract
In this paper, we firstly review the progress in ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON), by making use of the key attributes of this technology in the context of optical access and metro networks. Besides the inherit properties of coherent technology, we explore different modulation formats and pulse shaping. The performance is experimentally demonstrated through a 12×10 Gb/s bidirectional UDWDM-PON over hybrid 80 km standard single mode fiber (SSMF) and optical wireless link. High density, 6.25 GHz grid, Nyquist shaped 16-ary quadrature amplitude modulation (16QAM) and digital frequency shifting are some of the properties exploited together in the tests. Also, bidirectional transmission in fiber, relevant in the context, is analyzed in terms of nonlinear and back-reflection effects on receiver sensitivity. In addition, as a basis for the discussion on market readiness, we experimentally demonstrate real-time detection of a Nyquist-shaped quaternary phase-shift keying (QPSK) signal using simple 8-bit digital signal processing (DSP) on a field-programmable gate array (FPGA).