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 pre- Forward 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.
Highlights
The worst disadvantages of step-index polymethyl methacrylate (SI-PMMA) optical fibers are its high attenuation profile and high modal dispersion limiting the distance and capacity of the communication link [1,2]
Laser diodes (LD), light emitting diodes (LED) and optical filters at different wavelengths became accessible in the market allowing improving transmission capacity by means of wavelength division multiplexing (WDM), which is a consolidated technology for silica fibers [6]
All the baseband signals consisted of a 20 MHz real-valued Discrete Multitone (DMT) signal with 491 useful subcarriers (IFFT size = 984 considering DC and Nyquist null subcarriers). 16 samples per symbol are used as cyclic prefix (CP)
Summary
The worst disadvantages of step-index polymethyl methacrylate (SI-PMMA) optical fibers are its high attenuation profile and high modal dispersion limiting the distance and capacity of the communication link [1,2]. Plastic optical fiber (POF) has several advantages such as low cost, immunity to electromagnetic interference (EMI) and easy handling. These characteristics put the POF as an excellent solution for short range communication. Several articles demonstrating data transmission in POF up to Gbps over 20, 50 and 100m [5] have been published in the literature These articles have shown the possibilities of communication systems and links with different types of modulation and multiplexing techniques, light sources and filters. Laser diodes (LD), light emitting diodes (LED) and optical filters at different wavelengths became accessible in the market allowing improving transmission capacity by means of wavelength division multiplexing (WDM), which is a consolidated technology for silica fibers [6]. The very high single-wavelength bit-rates already demonstrated over POF prove that WDM for POF is still an open research field
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