Polymer optical fibers (POF) offer only transmission so far with one wavelength at 650 nm. In order to increase the overall transfer rate, the key element for wavelength division multiplexing (WDM) over POF will be presented. This element is a demultiplexer (DEMUX), which was designed in polymethylmethacrylate with an optical grating on an aspherical mirror to be produced by injection molding in a further development steps. The master was produced by diamond turning as a master for injection molding replication. The results of the different simulations followed by the development steps and the measurements of the prototype are presented. This prototype is used as a DEMUX in a WDM system with four wavelengths. In the WDM system, bit-error ratio (BER) measurements with an 8.26 Gb/s cumulated data rate in an offline processed discrete multitone modulation technique have been achieved over 100 m SI-POF at a BER of 10−3.
Data communication over Polymer Optical Fibers using Wavelength Division Multiplexing, offer high extension
capabilities for the overall data rates. Here, a de/multiplexer as a key component was developed im PMMAusing an
optical grating placed on an aspheric mirror by injection molding. A demonstrator is fabricated by directly machining it
in the PMMA material by means of diamond turning technique. The paper presents the results of the different
simulations followed by the development steps and the measurements done with the first demonstrator accompanied by
the first BER measurements using a 4 channel WDM transmission The record 8.26 Gb/s data transmission based on the
offline-processed discrete multitone modulation technique has been demonstrated over 100-m SI-POF at a bit-error ratio
The Polymer Optical Fiber (POF) has certain advantages over alternative data communication media such as glass fibers, copper cables, and wireless systems. It is pliable, durable, and cost effective, has small weight and a short bend radius, allows easy installation and quick troubleshooting, and provides immunity to electromagnetic interference. Due to its advantages, POF is a promising candidate for broadband in-house networks. Among different types of POF, the 1 mm PMMA Step-Index POF (SI-POF) is the best known and by far the most widely used type of POF. Present communication systems over POF use a single channel for data transmission. To increase the capacity of a single POF, multiple bandwidth-efficient channels can be transmitted over the same fiber. The technique is known as wavelength division multiplexing (WDM).
This paper reports on the current development status of a four-channel coarse WDM (CWDM) transmission system for Multi-Gbit/s in-house data communication via SI-POF. The block diagram of the experimental setup and the complete description of established communication system will be given in the full paper. The key photonic component in a CWDM system under development is a demultiplexer (DEMUX). To spatially separate different wavelength channels, a four-channel DEMUX with low insertion loss (<6 dB) and low crosstalk (<-30 dB) is realized in bulk optics technology at the Harz University. The operating principle, the description of the opto-mechanical setup, and the transfer function of the DEMUX will be shown. In addition, an optical link power budget analysis, based on the experimentally obtained data, will be carried out for all four channels. Finally, Multi-Gbit/s data transmission experiments will be performed with violet, blue, green, and red laser diodes via up to 25 m SI-POF links, and the results and their analysis will be presented.