The aim of this educational kit is to familiarize students with optical components for Telecommunications (Laser diodes, optical fibers, isolators…). We propose a kit containing a laser diode pump, a multiplexer and an erbium doped fiber.
With different components (attenuators, coupler, DFB laser, Bragg Gratings…), it is possible to study :
Erbium Doped Fiber Amplifiers (EDFA) have revolutionized Telecommunications. They allow an amplification of 30 dB of optical signal without any bandwidth limitation, on a 40 nm band, centred at 1550 nm. Consequently, fiber optics Telecommunications systems can be upgraded only by changing the emitter and receiver systems. Their wide amplification band also enables the development of WDM transmission, with a capacity of up to 1 Tbits/s. Amplifiers are now the key elements of optical Telecommunications.
IDIL. Fibres Optiques
Has developed a laboratory kit allowing a complete study of Erbium Doped Fiber Amplifiers (EDFA). Starting with the basic physical phenomena, this kit is suitable for the complete influence of many parameters such as the pump power, the input signal level on EDFA performances (ASE noise, saturation power, gain, etc…). The kit is complete, with different components including an optical isolator, a 1550 nm DFB laser, three attenuators, a fiber Bragg grating… The documentation explains in detail the fabrication and performance of all these components. It also contains various lecture notes and practical exercises.
The documentation of the kit is really complete. It contains, a detailed description of the components, and many experimental examples. Experimental part :
Theoretical lecture notes
Erbium doped fiber laser
Thanks to the modular presentation of the kit, it is possible to realize many types of sources :
Pump modulation allows the study of the laser onset :
The observation of the various spectra enables a complete understanding of laser behaviour (fluorescence decay, saturation effects, gain or loss dependence of the working wavelength…)
With the EDFA kit, students can make a complete investigation of the basics of optical amplification, by characterizing the EDFA key parameters. Here are a few examples:
The use of an optical spectrum analyser allows a complete study of an EDFA, by observing the evolution of fluorescence spectra for different configurations and pump power, for instance, the high wavelengths shift for a low pump power. Of course, the gain measurements are simplified.