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Wavelength Division Multiplexing for Short-Range Communication Over 1 mm Step-Index Polymer Optical Fiber

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Wavelength Division Multiplexing for Short-Range Communication Over 1 mm Step-Index Polymer Optical Fiber (Volume 14)

Mladen Jončić (Author)

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ISBN-13 (Hard Copy) 9783736992047
ISBN-13 (eBook) 9783736982048
Language English
Page Number 148
Edition 1. Aufl.
Book Series Lehrstuhl für Kommunikationstechnik Hochschule Harz (FH)
Volume 14
Publication Place Göttingen
Place of Dissertation Braunschweig
Publication Date 2016-02-15
General Categorization Dissertation
Departments Electrical engineering
Telecommunications and communications engineering
Keywords Demultiplexer, multiplexer, optical fiber communication, polymer optical fiber, spectral grids, visible diode lasers, wavelength division multiplexing
URL to External Homepage https://www.hs-harz.de/ufischerhirchert/publikationen/
Description

In short-range communication 1 mm step-index polymer optical fiber (SI-POF) established itself as a reasonable alternative to the traditional data communication media. The commercial systems with SI-POF use a single wavelength for data transmission. This thesis investigates the utilization of several optical carriers for parallel transmission of data channels over a single fiber, known as wavelength division multiplexing (WDM), in order to increase the capacity of SI-POF link. The focus of research is on (1) demultiplexing techniques for SI-POF, (2) high-speed WDM transmission over SI-POF and (3) channel allocation for POF WDM systems.
For WDM an optical demultiplexer is a key component. The thesis concentrates on the demultiplexing techniques employing thin-film interference filters and a concave diffraction grating. A four-channel interference filter-based SI-POF demultiplexer was realized using a precisely adjustable opto-mechanical setup. It provided low IL (< 5.7 dB) and high channel isolation (> 30 dB), outperforming other interference filter-based SI-POF demultiplexers reported so far. Theoretical and experimental analysis of an already realized SI-POF demultiplexer based on a concave diffraction grating was carried out. The results confirmed the wavelength separating function of the device. However, a poor grating quality due to unstable parameters of the ruling process led to high IL (> 20 dB) and low channel isolation (< 15 dB).
To demonstrate experimentally the feasibility and potential of a high-speed POF WDM concept, a four-channel laser diode-based data transmission setup employing the interference filter-based demultiplexer was realized. It was shown that POF WDM with lower channel rates and simple transmission technique could provide aggregate bit rates comparable to those achieved with the single-wavelength systems that used more advanced transmission techniques but required more signal processing.
In addition, the record 14.77 Gb/s and 8.26 Gb/s data rates employing the offline-processed discrete multitone modulation were demonstrated over 50 m and 100 m SI POF, respectively. Compared to the fastest single-wavelength systems, two times higher transmission capacities were achieved.
Finally, the channel allocation for POF WDM systems was investigated. It was shown that the extension of ITU-T G.694.2 Coarse WDM grid into the visible spectrum, with 15 channels and 20 nm channel spacing, is best suited to support WDM applications over SI-POF.