Remote Access Unit for Optic-to-Wireless Conversion

Łukasz Chorchos, Simon Rommel, J. P. Turkiewicz, Idelfonso Tafur Monroy, Juan José Vegas Olmos

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Abstract

In this paper we propose a design of a reconfigurable Remote Access Unit (RAU) interfacing optical dense wavelength division multiplexed (DWDM) networks with radio communication links. To generate a radio signal the device utilizes a
principles of incoherent heterodyne signal upconversion. The proposed RAU is able to operate in a whole optical C-band with 100GHz spaced channels and can generate radio signals in a wide frequency range limited only by used photodiode. Experimental tests of the RAU showed error free operation after 15km of fiber and 50m of radio link in W-band frequency range. Growing demand for high speed wireless data transmission and new wireless standards like 5G force network operators to find new solutions for backhaul networks. Presently, to meet this need, attention of many researchers and top network vendors has been directed towards millimeter wave radio links. Operation in the millimeter wave range brings new possibilities for a channel allocation as well as allows wider radio channels to be used. Moreover this frequency range is lighter licensed than regular GSM. This clearly shows a huge potential of millimeter waves for a high speed wireless data transmission. Nevertheless operation in the millimeter wave range struggles with one problem – traditional generation of signals in this frequency range is complex. To overcome this issue and provide simple integration of radio networks with present and future optical networks use of optical heterodyne signal upconversion was proposed and research projects like IPHOBAC-NG were founded. The aim of the mentioned project is to employ novel RAUs featuring opticto-wireless and wireless-to-optic conversion with a speeds of 1-10Gbit/s for broadband wireless access and up to 3Gbit/s for mobile backhaul. The RAU proposed in this paper is in line with these assumptions.
The principle of operation of the proposed RAU is as follow: when DWDM signal enters RAU a desired data channel is selected with a widely tunable fiber Fabry-Perot optical filter. Next signal is combined with a reference signal from a local oscillator spaced accordingly to the chosen radio frequency. Both signals are fed into a photodiode with 90GHz bandwidth and transmitted with antenas. The local oscillator and tunable filter are controlled over processing unit that can be easily connected to the management network. The filter and local oscillator are widely tunable what brings broad range of possible configurations. Tests in real-likely conditions showed great RAU's performance and allowed wireless transmission with the bit error rate at the level of 1-10.
Original languageEnglish
Publication date2016
Number of pages1
DOIs
Publication statusPublished - 2016
EventProgress In Electromagnetics Research Symposium 2016 - Shanghai International Convention Center, Shanghai, China
Duration: 8 Aug 201611 Aug 2016

Conference

ConferenceProgress In Electromagnetics Research Symposium 2016
LocationShanghai International Convention Center
CountryChina
CityShanghai
Period08/08/201611/08/2016

Bibliographical note

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