Implementing Long Reach WDM‐PON Delivering Downstream Data 2 Gbps and Upstream Data 70 Gbps on a Single Wavelength using Soliton Pulse

Abstract

This article presents Long Reach Wavelength Division Multiplexing Passive Optical Network (WDM‐PON) system capable of delivering downstream 2 Gbit/s data and upstream 70 Gbit/s data on a single wavelength using pulse source which is mode locked laser that generates a single pulse of “sech” shape with specified power and width. That is, soliton pulse. The optical source for downstream data and upstream data is sech pulse generator at central office (CO) and reflective semiconductor optical amplifier (RSOA) at each optical network unit (ONU). We use two RSOAs at each ONU for the 70‐Gb/s upstream transmission. The operating wavelengths of these RSOAs are separated by the free‐spectral range of the cyclic arrayed waveguide gratings used at the CO and remote node (RN) for (de)multiplexing the WDM channels. We extend the maximum reach of this WDM PON to be 123 km by using Erbium‐doped fiber amplifiers at the RN. The results show that the error‐free transmission can be achieved for all WDM channels in the wavelength range of >35 nm with sufficient power margins. We also investigate analysis of backscattered optical signal for upstream data and downstream data simultaneously. Bit error rate, were measured to demonstrate the proposed scheme. In this article, Long reach and large data service aspects of a WDM‐PON is presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2853–2859, 2013

A smooth evolution scheme to remodulated WDM‐PON based on POLSK/ASK orthogonal modulation

“…For WDM‐PON, the development of colorless ONUs is a key issue to reduce the system cost dramatically involved in the wavelength‐specific light sources required at every subscriber's site. Various types of colorless ONUs schemes have been proposed including the spectrum‐sliced light sources, ASE‐injected Fabry–Perot lasers , and signal remodulation .…”