ROAM Available Setups

Three main setups are available at ROAM consortium: one for OAM fibre testing, one for OAM fibre transmission, and the other for OAM device testing and exploitation.

Alle the setups have dedicated Optical Tables and exploit state of the art optical equipment.

To learn more about ROAM setup and ask for the setup availability for your experimental activity or possible cooperation, please visit our contact page.

Setups for the demonstrators of OAM multiplexed transmission and OAM switching

Two demonstrators have been implemented for OAM multiplexed transmission in fibre and OAM switching. Commercial network traffic generators have been exploited for the signal generation (Spirent traffic generator, ADVA FSP300 DWDM system, Ericssson SPO)

Setup and equipment for the OAM transmission and switching field trial

OAM fibre transmission at CNIT

CNIT Laboratories recently built an experimental setup for OAM fibre transmission. This testebed is located at at the Photonic Networks & Technologies National Laboratory of CNIT in Pisa, under the Digital and Microwave Photonics Area led by Prof. Antonella Bogoni.

The setup, reported below, is currently suitable for 10 OAM channel transmission. OAM modes of different orders can be transmitted through a 1Kn span of RCF fibre. At the output of the OAM fibre interference patterns with a Gaussian reference signal are observed to check the OAM order of the output beam. At CNIT paboratories, strong cooperation is currently going on between all the Consortium members to achieve the project objectives. Cooperation on OAM fibre transmission is invoving CNIT, UNIVBRIS, UL, HWDU and PSNC.

Available testing for external cooperation:

- OAM fibre testing (mode coupling, crosstalk, etc...);
- Multiple OAM channels transmission with OOK, and coherent transmission (QPSK and 16QAM)
- MIMO processing.

OAM fibre testing and transmission at UNIVBRIS

The OAM fibre testing and transmission testebed is currently located at the University of Bristol, in the The Photonic Research Laboratory led by Prof. Siyuan Yu. This testbed aims to provide a full testing and transmission platform for the OAM fibres designed and developed at the Laval University under the supervision of Prof. Sophie LaRochelle and Prof. Leslie A. Rusch, and exploit these fibres in the OAM-mode multiplexed transmission systems.

To date, there have been three different types of OAM fibres characterized and tested in this testbed. The OAM mode characteristics and manipulation techniques in fibres have been studied, including the mechanisms of mode coupling, compensation techniques of modal crosstalk, etc.

These OAM fibres have been exploited to demonstrate low-crosstalk MIMO-free OAM-mode division multiplexing (OAM-MDM) transmissions. In this testbed, a 4-mode OAM-MDM transmission system incorporated with WDM of 15 wavelengths has been achieved over the inverse-parabolic graded-index fibre (IPGIF) with the total capacity of 3.3-Tbit/s, and this is first demonstration in literature of the OAM-MDM transmission employing higher-order OAM modes (l > 1).

Available testing for external cooperation:

- OAM fibre testing (mode coupling, crosstalk, etc...);
- Multiple OAM channels transmission.
- MIMO processing.

OAM device testing and exploitation at CNIT

The setup for OAM device testing and exploitation is located at the National Laboratory of Photonic Network of CNIT in Pisa, under the Digital and Microwave Photonics Area led by Prof. Antonella Bogoni. The testbed aims are the testing of the integrated components designed and developed at the University of Glasgow under the guide of Prof. Marc Sorel, and the exploitation of such devices in the processing of OAM signals. The testbed comprises state of the art bulk optics equipment, infrared and visible cameras, lenses, mirrors, micro positioning systems, SLMs, special lensed fibres.

As of today, tens of single and multi OAM integrated emitters have been designed, tested and exploited in the testbed. The multi OAM emitters are able to generate multiple OAM modes simultaneously and are tunable via wavelength or temperature.

The fabricated integrated devices have been exploited to implement OAM switching and converting schemes. A 2x2 OAM switch scheme, and a OAM converted based, for the first time in literature, on integrated devices were experimentally validated.

Available testing for external cooperation:

- Testing of Photonic Integrated Circuit for beam emission (fibre coupling, losses, efficiency, etc...);
- Multiple OAM channels generation and transmission in air paths;
- OAM to gaussian and gaussian to OAM beams conversion;
- OAM channels processing (switching and conversion;
- Single or multiple channel generation in various formats (OOK, PSK, QPSK,...);
- Coherent signal generator/reveiver;
- BER testing equipment.



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