Abstract
Using WDM multiplexing is one of the ways to increase PON bandwidth. But as WDM-PON is still expensive and difficult administered, the idea of using a Reflective Semiconductor Optical Amplifier (RSOA) is proposed. It can be installed in WDM-PON ONU network devices. A comprehensive problem analysis of various investigations is done relating to a performance of RSOA-based WDM-PON systems. The simulation model is created for RSOA-based WDM-PON access with downstream signal reusing in ONU for upstream transmission. This model helped in researching of RSOA abilities using different downstream and upstream signals modulation. Signal parameters were tested working with special software OptiSystem. Results were evaluated regarding such a characteristics as Q factor, signal attenuation, power and optical fiber length. It was found that RZ code was better suited in remodulation with RSOA; it achieved 1.25 Gbps signal transmission at a distance 8 times larger than that of the in NRZ code case. DOI: http://dx.doi.org/10.5755/j01.eie.22.2.14601
Highlights
The necessity of contemporary optical access networks reconfiguration for their ability to meet the new requirements of bandwidth (BW) is determined by exponential growth of Internet traffic and new broadband services as well as the growing number of optical access users, while transmission distances are getting longer too
A downstream signal is generated by directly modulated single-mode lasers (SMLs) in central office (CO) and is transmitted to optical network terminal (ONT) by means of wavelength multiplexer distributed in remote node (RN). 75 % of optical power received in optical network unit (ONU) is directed to Reflective Semiconductor Optical Amplifier (RSOA) and 25 % of it is directed to optical coupler receiver
It was proposed to use the Remotely Pumped Erbium Doped Fiber Amplifier (RPEDFA) for 40 Gbps downstream and 10 Gbps upstream transmissions of long distance wavelength division multiplexing (WDM)-passive optical networks (PON) scheme with downstream transmission implemented using Quadrature Phase-Shift Keying (QPSK) transmitters and upstream transmission using Fiber Bragg gratings (FBG) optical equalizer based on RSOA modulator and intensity DD receiver [2]
Summary
The necessity of contemporary optical access networks reconfiguration for their ability to meet the new requirements of bandwidth (BW) is determined by exponential growth of Internet traffic and new broadband services as well as the growing number of optical access users, while transmission distances are getting longer too. Capacity can be used which enable to implement costeffective methods, for example, offset filtering, electronic equalization or advanced forward error correction (FEC)) [3] Another solution for WDM-PON cost reduction can be the considering of various colourless light source technologies: the splitting of the spectrum, amplified spontaneous emission (ASE) injected Fabry–Perot lasers and Reflective Semiconductor Optical Amplifier (RSOA) [4]. Those technologies assure independent functioning of optical network unit (ONU) regarding light wavelength and avoiding expensive external modulators and receivers in the ONU [2]. RSOA is an attractive choice for inexpensive ONU transmitters [3], [4], [6]–[9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
