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Optimal threshold detection for Málaga turbulent optical links

Jurado-Navas A., Garrido-Balsells J. M., Castillo-Vázquez M., Puerta-Notario A., Monroy I. T., Olmos J. J. V.

Optica Applicata

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2016

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Vol. 46, nr 4

577--595

EN

A new and generalized statistical model, called Málaga distribution (M distribution), has been derived recently to characterize the irradiance fluctuations of an unbounded optical wave front propagating through a turbulent medium under all irradiance fluctuation conditions. As great advantages associated to that model, we can indicate that it is written in a simple tractable closed-form expression and that it is able to unify most of the proposed statistical models for free-space optical communications derived until now in the scientific literature. Based on that Málaga model, we have analyzed in this paper the role of the detection threshold in a free-space optical system employing an on-off keying modulation technique and involved in different scenarios, and taking into account the extinction ratio associated to the employed laser. First we have derived some analytical expressions for the lower-bound performance of the free-space optical system with the light intensity fading induced by turbulence obtained when the additive white Gaussian noise is not present in the system. Then, we have analyzed the optimal threshold in the system and how it changes when atmospheric conditions vary. Finally, a closed form expression for the bit error rate of that system is derived.

2

Analog-based duobinary-4-PAM for electrical bandwidth limited optical fiber links

Suhr L.F., Madsen P., Monroy I. T., Olmos J. J. V.

Optica Applicata

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2016

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Vol. 46, nr 1

71--78

EN

This paper presents a demonstration of a seven level duobinary-4-PAM signal operating at 10.16 Gbit/s. The polybinary generation is achieved by a simple electrical Bessel filter of 5th order, with a frequency cut-off of 1.8 GHz. We assess the impact of the filter placement, either at the transmitter or the receiver, and find the impact is minimal in terms of bit error rate performance in transmissions of up to 40 km of single mode fiber.

3

100G shortwave wavelength division multiplexing solutions for multimode fiber data links

Cimoli B., Estaran Tolosa J. M., Rodes Lopez G. A., Vegas Olmos J. J., Monroy I. T.

Optica Applicata

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2016

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Vol. 46, nr 3

409--419

EN

We investigate an alternative 100G solution for optical short-range data center links. The presented solution adopts wavelength division multiplexing technology to transmit four channels of 25G over a multimode fiber. A comparative performance analysis of the wavelength-grid selection for the wavelength division multiplexing data link is reported. The analysis includes transmissions over standard optical multimode fiber (OM): OM2, OM3 and OM4.