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Photonics-based Solutions for Wireless Access
Contact : Frédéric LUCARZ
2. Purposes
Within this context, CapilR emerged in 2008 as a joint initiative between the Optics and Microwave Departments of Telecom Bretagne and is now officially supported by the Institut Telecom through its Fondation Telecom.
CapilR provides a seamless and complete offer based on merging photonics and radio-frequency technologies, to enable large scale deployments of mobile and wireless networks in environments where user density is high.
CapilR is a technological platform dedicated to photonics-based solutions for enhanced wireless coverage in access and home networks. CapilR focuses mainly on radio-over-fibre and all-optical wireless transmission technologies for the deployment of high-capacity and future-proof broadband infrastructures, capable of delivering a large variety of services to mobile end users in indoor and outdoor environments, such as domestic premises, transport hubs (airports, railway, tramway, bus, and tube stations), stadiums, shopping malls, etc.
3. Harware & Software Resources
CapilR has access to an extensive set of state-of-the-art hardware equipment for both optical and RF characterisation that is unique in Brittany. In particular, CapilR has facilitated access to existing technological platforms including: Perdyn, specialising in Optical Access Networks; Optimo, specialising in microwave and optoelectronic integration; and Palmyre, specialising in RF wireless.
For optimum sharing of hardware resources, CapilR is located along with Perdyn in a dedicated on-campus workspace at the ARAGO Centre, where a series of demonstrators are being tested in situ (e.g., distributed antenna system, optical wireless system).
Equipment available at the Arago Centre (Perdyn)
In terms of modelling, CapilR is currently developing dedicated tools for end-to-end sytem simulation based on commercial software, including VPI, ADS Agilent, FEKO, WinProp, and CoveraZone, to assist in the main stages of system deployment.
4. Our Team
CapilR builds on a multidisciplinary team with a broad range of expertise, from photonics to microwave and millimetre-wave radio up to 100GHz. CapilR further broadens its competencies by including international partners. At present, our main associate partners include Perdyn, ENIB-RESO and the University of Ottawa.
Our team (from left to right):
Jean-Louis DE BOUGRENET DE LA TOCNAYE, Frédéric LUCARZ,
Patrice PAJUSCO, Daniel BOURREAU, Tatiana LOUKINA,
Michel NEY, Philippe GRAVEY, Camilla KARNFELT
5. Services & Activities
Well-adapted to industrial partners' needs, Capil® offers a wide range of expertise in engineering and technological scalability, as well as in assessing existing equipment and systems supplied by technology providers.
Our main services and activities include :
- Distributed Antenna Systems (DAS) & pico-cellular networks
- RF characterisation of optoelectronic components
- Noise and power budget analysis of communication links
- Efficient schemes for powering network nodes
- Optical generation and distribution of millimetre-wave carriers
- Photonic Mixing for frequency conversion of RF signals
CapilR provides an ideal framework for establishing collaborative projects with academic and industrial partners at an international level. CapilR also provides prior art searches and guidance on Intellectual Property issues.
Previous projects include:
- DATASHADE (2008): Key elements for merging optical and radio-frequency technologies for mobile and wireless access networks
- OPTIBUS (2007-2010): Low-cost wireless access point based on fibre optics.
6. Recent developments
A Distributed Antenna System (DAS) demonstrator has been implemented to provide wireless coverage on the first floor of the ARAGO Centre.
The demonstrator comprises a wireless router adapted to distribute WiFi signals compliant with IEEE 802.11g to a set of 4 wideband omnidirectional antennas, through a wired infrastructure based on fibre and coaxial cable, as depicted in the diagram below.
For that purpose, an optical transmission link was introduced between the router and the antennas by means of two radio-over-fibre transceivers connected by a 776m single-mode fibre span.
Distributed Antenna System demonstrator
based on commercially-available components
The system has been successfully characterised in terms of gain, non-linearity and frequency response up to 2.5 GHz. Its performance has been assessed in terms of bit rates and latency, both experimentally and theoretically. The optimised wireless coverage has been modelled (Winprop) and verified experimentally (CoveraZone).
In parallel, the CapilR team is currently actively working towards the implementation of compact radio-over-fibre transceivers based on low-cost optoelectronic components (laser, photodiode), coupled with an integrated wideband antenna. This activity is directly linked to the PhD research work being carried out by Hexin LIU.
These transceivers will be tested in a point-to-point link before deployment of a picocellular network to provide wireless coverage with optimized power consumption and enhanced quality of service. The demonstrator will also serve as a wireless extension of a Passive Optical Network supplied by the PERDYN platform.
Contact : Frederic.Lucarz@telecom-bretagne.eu
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