Laser Sharing Uplink Polarization Division Multiplexing FBMC Passive Optical Network

• Published in: Journal of lightwave technology 2023-04, Vol.41 (8), p.2323-2332
• Main Authors: Wang, Xiaowu, Chen, Zhiwei, Yin, Mingzhu, Wang, Wei, Li, Zibin, Ni, Weihao, Li, Fan
• Format: Article
• Language: English
• Subjects: Algorithms; Bit error rate; Coherent passive optical network (PON); Error correction; External-cavity lasers; filter bank multicarrier (FBMC); Filter banks; Frequency division multiple access; frequency division multiplexing (FDMA); laser sharing; Lasers; multiple access interference (MAI); Network terminals; OFDM; Optical communication; Optical fibers; Optical network units; Optical polarization; Optical receivers; Orthogonal Frequency Division Multiplexing; orthogonal frequency division multiplexing (OFDM); Passive optical networks; Polarization; polarization division multiplexing (PDM); Uplink; Uplinking
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2022.3231247

In this paper, we proposed and experimentally demonstrated a laser sharing filter bank multicarrier passive optical network (FBMC-PON) uplink architecture, to provide high spectrum efficiency frequency division multiple access (FDMA) to the optical network terminals (ONTs) with aggregated uplink data rate of up to 100 Gb/s/λ for each optical network unit (ONU), in a fiber to the frontage (FTTF) scenario utilizing existing copper infrastructure. Intensity modulation (IM) and heterodyne detection are implemented, combined with polarization division multiplexing (PDM) to double the system capacity. The uplink performance of FBMC-PON is emulated with two asynchronous ONT bands in transmission over 20 km single mode fiber (SMF). FBMC with prototype filters (PFs) PHYDYAS, extended Gaussian filter (EGF) and isotropic orthogonal transform algorithm (IOTA) is discussed in comparison with orthogonal frequency division multiplexing (OFDM) in terms of frequency guard band and multiple access interference (MAI). The laser from an external cavity laser (ECL) is split and shared among ONTs. The experimental results show that FBMC can achieve significant improved receiver sensitivity compared to OFDM in the asynchronous uplink. FBMC with PHYDYAS can avoid MAI with frequency guard interval of one time the subcarrier spacing. With optical receiving power (ROP) of −23 dBm, to support 2, 4 and 8 ONTs, the required optical power of the narrow linewidth laser is respectively 10, 16 and 22 dBm with bit error rate (BER) at the hard decision forward error correction (HD-FEC) threshold.