Digital Transmission over Optical Fiber
Diouba Sacko1, Hassana Ganamé2

1Diouba Sacko, Département Génie Industriel, Ecole Nationale d’Ingénieurs – Abderhamane Baba Touré (ENI-ABT), Bamako, République du Mali.
2Hassana Ganamé, Département Génie Industriel, Ecole Nationale d’Ingénieurs – Abderhamane Baba Touré (ENI-ABT), Bamako.

Manuscript received on 10 August 2017 | Revised Manuscript received on 18 August 2017 | Manuscript Published on 30 August 2017 | PP: 199-208 | Volume-6 Issue-6, August 2017 | Retrieval Number: F5155086617/17©BEIESP
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Abstract: Surrounded by the cladding of lower refractive index, the optical fiber is a guide of wave which exploits the refractive properties of the light. It is a physical transmission channel used for the propagation of luminous signals modulated in wavelengths. Compared with the other existing transmission channels, it presents an almost constant attenuation on an enormous interval of frequencies and thus offers the advantage of large band-widths. By allowing the communication on a long distance, the optical fibers constitute one of the key channels of the telecommunications. Information to be transmitted is either analogical or discrete; however the digital transmission by optical fiber constitutes the main use of optical fiber connections. Indeed, because of their limited performance, optoelectronic components such as LED, laser, photodiode or phototransistor are not the best ones in the analogical multiplexed transmissions. The development of the diode-pumped, erbium-doped fiber amplifier (EDFA) played a crucial role in enhancing the feasibility and performance of long-distance and WDM applications. The emission module of an optical link is made up of various components (laser, modulator, driver…). It provides to transmission channel a visible signal on which the data are been registered. The external technique of modulation to 40 Gbits/s was retained because beyond 5 Gbits/s, the external modulation is essential to maintain a quality of correct transmission. The principal element of the transmission channel is the optical fiber. It offers a very great transport capacity, larger than the opto-electronics converters and the electronic components. The reception module converts the information carried by the modulation of the luminous signal into pulses. It is composed of a photodiode, an electrical amplifier, a filter and a regenerator. In this study, simulation system was been used in order to optimize an optical link with 40 Gbits/s in temporal electronic multiplexing (ETDM) and to evaluate the drifts impact of the parameters of the components on the performances of the optical systems. In this paper, the simulator system COMSIS was retained, it allows the researchers and the engineers to model, simulate, analyze and design any module of treatment of the signal, from the most elementary device to the more complex communication system . It is an interactive environment which combines numerical tools with graphic functionalities and a user interface.
Keywords: Digital Transmission, Optical Fiber, Modulation, Simulation.

Scope of the Article: Wireless Power Transmission