| Summary: | 博士 === 國立交通大學 === 光電工程研究所 === 105 === This work proposes a >50-Gb/s and >60-km optical OFDM long reach (LR) passive optical network (PON) for the next generation network standard. OFDM signal has a lot of advantages such as supporting dynamic modulation to adapt to fading channel. However, there are still several issues in an OFDM system, such as modulator nonlinearity, fiber nonlinearity, dispersion induced nonlinear distortion and insufficient loss budget. To deal with these issues, we propose a theoretical model, subcarrier-to-subcarrier intermixing interference (SSII), as well as the corresponding compensation method, SSII cancellation, which can effectively compensate the aforementioned nonlinear distortions. Since the SSII cancellation relies on the precision of the mathematical model, we also propose an adaptive-weighted Volterra filtering and experimentally compare these two compensation schemes. Moreover, wavelength division multiplexing (WDM) technology is utilized to demonstrate the feasibility of the proposed scheme in a multi-channel system. Based on low cost 10-GHz EAM and PIN, we achieved a 200-Gb/s transmission over a distance of 60 km with a loss budget of >30 dB, while providing support for 128 ONUs at >1.6 Gb/s/ONU without the need for an inline amplifier or pre-amplifier.
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