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Modeling and characterization of VCSEL-based avionics full-duplex ethernet (AFDX) gigabit links

Ly, Khadijetou and Rissons, Angélique and Gambardella, Eddie and Bajon, Damienne and Mollier, Jean-Claude Modeling and characterization of VCSEL-based avionics full-duplex ethernet (AFDX) gigabit links. (2008) In: SPIE Photonics West, 19-24 Jan 2008, San Jose, United States .

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Official URL: http://dx.doi.org/10.1117/12.760050

Abstract

Low cost and intrinsic performances of 850 nm Vertical Cavity Surface Emitting Lasers (VCSELs) compared to Light Emitting Diodes make them very attractive for high speed and short distances data communication links through optical fibers. Weight saving and Electromagnetic Interference withstanding requirements have led to the need of a reliable solution to improve existing avionics high speed buses (e.g. AFDX) up to 1Gbps over 100m. To predict and optimize the performance of the link, the physical behavior of the VCSEL must be well understood. First, a theoretical study is performed through the rate equations adapted to VCSEL in large signal modulation. Averaged turn-on delays and oscillation effects are analytically computed and analyzed for different values of the on - and off state currents. This will affect the eye pattern, timing jitter and Bit Error Rate (BER) of the signal that must remain within IEEE 802.3 standard limits. In particular, the off-state current is minimized below the threshold to allow the highest possible Extinction Ratio. At this level, the spontaneous emission is dominating and leads to significant turn-on delay, turn-on jitter and bit pattern effects. Also, the transverse multimode behavior of VCSELs, caused by Spatial Hole Burning leads to some dispersion in the fiber and degradation of BER. VCSEL to Multimode Fiber coupling model is provided for prediction and optimization of modal dispersion. Lastly, turn-on delay measurements are performed on a real mock-up and results are compared with calculations.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to SPIE. The definitive version is available at SPIE website : http://spie.org/. The original PDF of the article can be found at: http://dx.doi.org/10.1117/12.760050
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Other partners > Airbus (FRANCE)
Laboratory name:
Département d'Electronique, Optronique et Signal - DEOS (Toulouse, France) - Micro-ondes et Optique pour Systèmes Embarqués - MOSE
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Deposited By: Angelique Rissons

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