100G Self-Coherent PON Based on Pre-Amplified Stokes Vector Direct Detection

In this letter, for the first time, a novel 100G pre-amplified self-coherent passive optical network (SC-PON) architecture is proposed and experimentally verified. To mitigate the reduction in receiver sensitivity resulting from co-transmitted carriers in self-coherent systems, a semiconductor optical amplifier (SOA) was deployed for pre-amplification with a noise figure of 7.5dB and a small-signal gain of 30dB. As a proof-of-concept, a system experiment of pre-amplified 25-GBaud 16-QAM SC-PON is demonstrated in the downstream, achieving a data rate of 100 Gb/s/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda $ </tex-math></inline-formula> over 20-km single-mode fiber (SMF) with a receiver sensitivity of -22dBm. We achieve a power budget beyond 33.6 dB under the 15% SD-FEC threshold of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2\times 10 ^{-2}$ </tex-math></inline-formula>, surpassing the power budget specified by ITU-T class N1 and IEEE class PR(X). The results indicate that the proposed SC-PON has the potential applicability for next-generation beyond 100G access systems.