The operation of a network-embedded colorless selftuning transmitter for WDM networks is experimentally demonstrated from 2.5-up to 10.7-Gb/s data rates. Colorless operation is achieved by self-seeding an ultra-fast reflective semiconductor optical amplifier (RSOA) with the feedback signal reflected at the 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 RSOAs, which can be designed to operate on a single polarization. The impact on the transmission of the fiber chromatic dispersion at different bit-rates and with different channel bandwidths of the WDM multiplexer filter is experimentally investigated up to 10.7 Gb/s. The tolerance to positive and negative dispersive loads is also assessed.

Reflective semiconductor optical amplifier (RSOA)-based network-embedded self-tuning solutions for colorless optical network unit in wavelength-division-multiplexed passive optical network architecture suffer the device polarization-dependent gain (PDG). The Faraday-mirror-based topology proposed in the literature for low PDG RSOA is not suitable for high PDG RSOA. A polarization retracing circuit is proposed and discussed to comply with the high PDG RSOA. The polarization evolution is theoretically and experimentally analyzed in the presence of a high PDG RSOA comparing three cases: standard topology with standard mirror, the retracing circuit proposed in the literature with a Faraday rotator mirror (FRM), and the proposed retracing circuit, which includes both an FRM and a Faraday rotato

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.

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

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).