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Becker T.,Polymer Optical Fiber Application Center | Loquai S.,Polymer Optical Fiber Application Center | Ziemann O.,Polymer Optical Fiber Application Center | Poisel H.,Polymer Optical Fiber Application Center | Schmauss B.,Friedrich - Alexander - University, Erlangen - Nuremberg
24th International Conference on Plastic Optical Fibers, POF 2015 - Conference Proceedings | Year: 2015

We investigate effects that occur in large core (1 mm) step index (SI) polymer optical fibers (POF) when exposed to temperature changes. The volume of Polymethylmethacrylate (PMMA) and hence the length of a SI-POF is known to increase with rising temperatures due to thermal expansion. On the other hand its refractive index is also temperature-dependent and decreases when the fiber is heated. A ray of light travelling along the fiber is therefore facing two contrary effects: The geometrical length of its path through the fiber increases while it is propagating at a higher speed. As a consequence also the modal dispersion of the fiber depends on the temperature. The effects are evaluated in an experimental setup and are in good agreement with a corresponding ray tracing simulation.


Joncic M.,Hochschule Harz University of Applied Sciences | Kruglov R.,Polymer Optical Fiber Application Center | Haupt M.,Hochschule Harz University of Applied Sciences | Caspary R.,TU Braunschweig | And 2 more authors.
IEEE Photonics Technology Letters | Year: 2014

Wavelength division multiplexing (WDM) is a promising solution for upgrading the capacity of polymer optical fiber (POF)-based telecommunication networks. In this letter, we report on the successful realization of a four-channel high-speed WDM transmission system for 1-mm diameter step-index POF (SI-POF). For combining the optical signals coming from 405-, 450-, 515-, and 639-nm laser diodes onto 1-mm SI-POF, a (4 × 1) coupler with low insertion loss (IL) has been developed. To spatially separate different wavelength channels, a four-channel demultiplexer with low IL (<5.7 dB) and high (non)adjacent channel isolation (>30 dB) has been realized in bulk optics. The 14.77-Gb/s data transmission based on the offline-processed discrete multitone modulation technique has been demonstrated over 50-m SI-POF at a bit-error rate of (10-3). © 2014 IEEE.


Schueppert M.,University of Applied Sciences of Leipzig | Kruglov R.,Polymer Optical Fiber Application Center | Loquai S.,Polymer Optical Fiber Application Center | Bunge C.-A.,University of Applied Sciences of Leipzig
IEEE Photonics Technology Letters | Year: 2015

Nonlinear signal distortions originated in a resonant-cavity light emitting diode (RC-LED) are investigated. Using laboratory measurements and offline processing, the RC-LED's nonlinear behavior is investigated for multilevel pulse amplitude modulation (M-PAM) and carrierless amplitude and phase modulation with the help of a Volterra-series expansion. Dynamic nonlinearities are identified which are strongly dependent on the modulation format used. The impact of these nonlinearities is then investigated for a short-range gigabit transmission link, consisting of a RC-LED and 30 m of step-index polymer optical fiber. It is shown that dynamic nonlinearities are a dominat source of signal impairments when using M-PAM at lower baud rates and that the performance of M-PAM can be considerably improved with a Volterra-series extension of a decision feedback equalizer (DFE) compared with a regular DFE. © 1989-2012 IEEE.


Ziemann O.,Polymer Optical Fiber Application Center | Poisel H.,Polymer Optical Fiber Application Center
24th International Conference on Plastic Optical Fibers, POF 2015 - Conference Proceedings | Year: 2015

The POF-AC Nürnberg was founded in September of 2000. This year, we can look back on one and a half decade of successful work in different areas of the application of POF and other large diameter optical fibers. The maximum bit rate on 1 mm core diameter POF increased from 1 Gbit/s to 40 Gbit/s over this period. Wavelength multiplexing, bend insensitive multi core POF and high bit rate optical rotary joints are examples for the development of the POF technology.


Gehrke M.,Polymer Optical Fiber Application Center | Loquai S.,Polymer Optical Fiber Application Center | Ziemann O.,Polymer Optical Fiber Application Center | Schmauss B.,Friedrich - Alexander - University, Erlangen - Nuremberg
24th International Conference on Plastic Optical Fibers, POF 2015 - Conference Proceedings | Year: 2015

This paper presents a new simulation approach to obtain angular time domain backscatter signals of large core (1 mm) step index polymer optical fibers (POF) based on the time dependent power flow equation. In this model the three major fiber impairments mode coupling, modal attenuation and modal dispersion are taken into account as functions of the axial propagation angle. Chromatic and material dispersion are neglected due to typically less significant consequences regarding the transmission characteristics of the fiber. The development of the propagation along the fiber is hereby described by combination of a diffusion and an attenuation process. The required Rayleigh backscatter model is calculated from the turbidity based upon the molecular structure of an amorphous polymer glass.

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