Highly Spectrally Efficient Discrete Multi-Tone Transmission over Step Index PMMA optical fibre for Short-Range Optical Communication

Abstract

Abstract-In this article we present high spectral efficiency DMT transmissions over 20 m of Step-Index polymethyl methacrylate optical fiber in the visible range. We demonstrated that using illumination light emitting diodes at 450, 520, 560 and 650 nm it is possible to achieve as high as 6.39 bits/s/Hz for a preForward Error Correction with a target Bit Error Rate of 10 -3 . The optical source at 560 nm was developed in our laboratory and then we demonstrated its usage as a new channel in WDM system.

Modelling of an Optical Access Network Platform for Radio-Frequency Transmission in the S Band / Modelação de uma Plataforma de Rede de Acesso Óptico para Transmissão de Radiofrequências na Banda S

“…The experimental setup [2], [3], [4] consists of a computer that performs DMT modulation/demodulation, an arbitrary function generator Tektronik AFG3251, which works as a DAC, a bias-T Mini-Circuits ZG85-12G+, a DC source ICEL Manaus 1500, the fluorescent optical source operating at 560 nm [1], 20 m of Eska Mitsubishi SI-POF, a fixed gain photodetector Thorlabs PDA10A and a digital storage oscilloscope (DSO)…”

“…With this estimation, a more precise assessment can be done by measuring third-order intermodulation (IM3) distortion using two sinusoidal signals [15]. Some light sources, such as Light Emitting Diodes (LEDs), do not have distinguishable linear regions [3]. Besides, IM3 assessment does not perfectly describe the multicarrier modulation signal with harmonics and potentially cross-modulation products originating from the numerous subcarriers of the modulating signal.…”

“…Optical sources have been proposed based on fast wavelength conversion [1], where a 560-nm light source composed by a fluorescent plastic optical fiber (FPOF) is pumped by a co-propagating source at 520 nm, generated by a green light-emitting diode (LED). Afterwards, the use of a wavelength-converted optical carrier at 560 nm was experimentally assessed for 120 Mb/s with discrete multitone (DMT) data communication [2], [3], [4]. Spectral efficiency of 6 bits/s/Hz has Brazilian Journal of Development, Curitiba, v.7, n.8, p.79119-79134 aug. 2021 been achieved over 20 m of step index plastic optical fiber (SI-POF) for a pre-forward error correction (FEC) target bit-error rate (BER) of 10 -3 .…”

“…In some previous works [3], [4], data rates have been achieved up to 128 Mb/s for a pre-FEC target BER of 10 -3 over 20 m of SI-POF for FPOF with intensity modulation and direct detection (IM/DD). Moreover, that implementation reached spectral efficiency as high as 6.39 bits/s/Hz and aggregated rough data bit rates up to 455 Mb/s using four optical sources operating on the main transmission windows of the POF [3].…”

“…In some previous works [3], [4], data rates have been achieved up to 128 Mb/s for a pre-FEC target BER of 10 -3 over 20 m of SI-POF for FPOF with intensity modulation and direct detection (IM/DD). Moreover, that implementation reached spectral efficiency as high as 6.39 bits/s/Hz and aggregated rough data bit rates up to 455 Mb/s using four optical sources operating on the main transmission windows of the POF [3]. In [4], channel non-linearities are addressed by varying the bias current and the amplitude of the electrical modulating signal by a scaling factor (SF) in terms of the multicarrier signalto-noise ratio (SNRmc) in an optical back-to-back configuration (OB2B).…”