Control panel for EDFA modul

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Dr. Gerhátné Udvary Eszter
Department of Broadband Infocommunications and Electromagnetic Theory

The Erbium Doped Fiber Optic Amplifier (EDFA) plays an important role in today’s optical networks. With suitable construction and control the device makes a long-range, 600 km connection without regenerators possible. The device is optically transparent, so it’s use will be important for future’s all optical networks.

In my degree, I present the EDFA optical amplifier, its application, its construction and its function. I review the main features, characteristics, and with this knowledge we may accomplish optimal transfer characteristics.

Next, I present one realisation of control of a high-performance EDFA located in Optical and Microwave Telecommunication Laboratory. To the realisation of control I put on necessary characteristics by way of measurements. The examined device contains 6 pieces of pumping laser, which had to be stabilized in terms of performance and temperature. It also contains a variable optical attenuator with a stepper motor, of which control I had to solve, furthermore. In my degree I present the steps of the design, from the simulation of circuit to the printed circuit board. Using the completed panel measurements were carried out.

In the last section I realised the digital control of the EDFA modul, with help of analog-digital IC’s PCF8591 and the minicomputer, Raspberry PI. The GPIO port of the computer allowed to control the EDFA modul via the I2C bus, the program is written in Python language.

In summary, I can say that I made a handy control panel for the EDFA module, which can be developed further by writing more powerful control program.


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