Operation of a network-embedded colorless selftuning transmitter for wavelength division multiplexing (WDM) networks is experimentally demonstrated at 10-Gb/s data rate. Colorless operation is achieved by self-seeding an O-band reflective semiconductor optical amplifier (RSOA) with the feedback signal reflected at the remote node WDM multiplexer filter. In particular, the transmitter exploits a 2-Faraday rotators configuration to ensure polarization insensitive operation and allowing for the exploitation of high gain O-band RSOAs, which present a very high polarization dependent gain. Two different multiplexers and various lengths of drop fibers constituted the network-embedded transmitters. Transmission up to 72 km of standard single mode fiber has been demonstrated at 10 Gb/s, confirming the absence of chromatic dispersion penalties as expected from the choice of the O-band operation. Index Terms-Passive optical network (PON), reflective semiconductor optical amplifier (RSOA), colorless transmitter, fronthaul.
A DWDM self-seeded source achieves transmission in the O-band up to 90km SSMF at 2.5Gbps. Moreover, a "face-to-face" self-seeded architecture permits to realize transmissions at 2.5Gbps with extra-long optical cavities reaching 70km of SSMF.
We propose a network-embedded colorless self-tuning transmitter for wavelength division multiplexed (WDM) networks based on self-seeding in reflective semiconductor optical amplifiers (RSOAs). We compare up to a 10-Gb/s data rate in either O-band or C-band operation. In particular, the transmitter exploits a two-Faraday rotator configuration to ensure polarization-insensitive operation and allowing for the exploitation of high-gain C-and O-band RSOAs, which present a very high polarization-dependent gain. Two different multiplexers and various lengths of drop fibers constituted the networkembedded transmitters in order to evaluate various dispersion load influence on cavity buildup. Moreover, transmission over standard single-mode feeder fiber has been evaluated both at 2.5 and 10 Gb/s to compare the performance in both bands, confirming the absence of chromatic dispersion penalties for the O-band operation. Index Terms-Chromatic dispersion; Colorless optical transmitter; Reflective semiconductor optical amplifier (RSOA); WDM passive optical networks (PON).
The self-seeded cavity appeared in the last few years\ud
as a colorless and low cost solution for wavelength division multiplexing\ud
access. Although the self-seeded source presents a simple\ud
architecture, its behavior has been misunderstood for a long time.\ud
In this paper, we explain its operating principles and why we can\ud
define such a source as a laser. We evidence a laser threshold and\ud
show cavity modes for various lengths.We describe the conditions\ud
required by the reflective semiconductor optical amplifier to sustain\ud
the self-seeded cavity, by evaluating the choice of its epitaxial\ud
structure and the influence of its optical confinement factor. An\ud
analysis of the cavity behavior is given, pointing out that the relative\ud
intensity noise results from the beating noise between the cavity\ud
modes. An overview over the last performances in the C- as well as\ud
in the O-band is then presented. Some practical applications are\ud
reported. In particular, we detail themobile front-haul as a possible\ud
employment for the self-seeded cavity to achieve a self-organized\ud
wavelength network
In this paper, we review recent advances of the optical access network in the path toward Cloud-computing-related technologies, software defined networking, and network function virtualization. We present the new network management architectures proposed by standardization bodies such as the Broadband Forum and non-profit organizations such as the Open Networking Foundation and propose to use today’s Orange-France Operation Support System as a baseline to discuss different evolution paths. We also provide a review of recent advances in the optical line terminal (OLT) hardware evolution, from white-box OLTs to general purpose hardware, and identify the remaining related challenges, such as energy consumption and interoperability. We also show how Cloud-computing technologies in optical access networks could remove the frontier between network segments (home local area network, optical transport network, and mobile network) by deeply improving the synergy among them.
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