In the cabin of a modern aircraft, heterogeneous data from different systems are transported using separate and dedicated communication infrastructures. Moreover, the predominant copper-based networks in civil aircraft cabins have become more complex, heavy and expensive. Such architectures are not very scalable and require high maintenance costs with multi-skilled support teams. Therefore, leveraging fibre optic network technology for aviation applications represents one of the most innovative technological developments in the aeronautics industry to increase the network modularity, flexibility and scalability. Indeed, these systems implement all-optical scalable and reconfigurable components that can support very high-capacity point-to-multipoint architectures. In addition, optical networks technology provide a resilient infrastructure over the aircraft life (30 years) and offers the best guarantees to reduce the power consumption, weight1 and overall carbon footprint of the network. Within this frame, the main objective of this work is to identify, describe and analyze an aircraft intra-cabin optical network, based on combined PON and WDM architectures. This solution is relevant in terms of data rate, bandwidth, multiplexing of heterogeneous signals from a large number of data sources and offers flexible and protocol-independent communication links, making it a suitable alternative to aircraft systems. The pro- posed network configuration is analyzed through two options whose performance are evaluated using photonic simulation of realistic optical components, with data rates of 10Gbit/s and under environmental aeronautical constraints, e.g. [-40°C to + 85°C] temperature range and vibration bandwidth up to 2000Hz (DO-160 standard).
We present here a 1.55 μm single mode Vertical-Cavity Surface-Emitting Laser (VCSEL) based low phasenoise
ring optoelectronic (OEO) oscillator operating at 2.49 GHz for aerospace, avionics and embedded systems
applications. Experiments using optical fibers of different lengths have been carried out to obtain optimal results.
A phase-noise measurement of -107 dBc/Hz at an offset of 10 kHz from the carrier is obtained. A 3-dB linewidth
of 16 Hz for this oscillator signal has been measured. An analysis of lateral mode spacing or Free Spectral Range
(FSR) as a function of fiber length has been carried out. A parametric comparison with DFB Laser-based and
multimode VCSEL-based opto-electronic oscillators is also presented.
For a long time, only a small wavelength range of Vertical-Cavity Surface-Emitting Lasers (VCSEL) was available.
The current evolution in process technology allows the fabrication of long wavelength VCSEL that is
interesting for Telecom systems because they offer a higher integration level than the existing optical sources
at lower costs since they are fabricated in arrays. We propose to focus our investigation on the behavior of
singlemode 1.55μm VCSEL. We aim at precisely knowing their spectral properties under direct modulation.
We present a study about the linewidth measurement and the linewidth enhancement factor, also called the
Henry - or the alpha - factor. Many studies have been reported but only a few of them are really efficient. Two
different set-ups are presented here to extract alpha factor. The first one uses an interferometer based on the
heterodyne technique and the second uses the dispersive properties of an optical fiber. We compare both results
and discuss about each set-up.
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