Fig. 5 Receiver Module – front view
Fig. 6 Receiver Module – left view
Fig. 7 Receiver Module – right view
2.3Education Setup Handling
Transmitter includes 5 buttons and several controls
s
uch as potentiometers, micro switches, which are
located on the board of the module. On the left and
right side of the module, there are located inputs
(left – BNC connectors analogue and digital,
microphone input – 3.5 mm jack) and outputs (right
– ST connectors LED and laser diods). Buttons set
the following behavior of the transmitter module: 1)
input from channel 1 (signal from internal generator,
external analogue signal, input from external
microphone), 2) input from channel 2 (same type of
signals as from channel 1), 3) current display of the
selected output, 4) output selection for channel 1
(LED or laser), 5) output selection for channel 2.
Potentiometers set the gain for channel 1 and 2, and
output current magnitude for channels 1 and 2.
Receiver includes also 5 buttons and several
controls. On the left and right side of the module,
there are located inputs for photo detectors (left – 4
ST connectors and 1 external input for 3.5 mm jack)
and outputs (right – 2 BNC connectors for analogue
and digital signal and one 3.5 mm jack for
earphones or speaker). Buttons set the following
behavior of the receiver module: 1) selection of
analogue channel input (photo detector 1 to 4), 2)
selection of digital channel input (photo detector 1
to 4), 3) selection of optical power meter (analogue,
digital, 1 kHz, DC), 4) selection of optical power
meter units ( W or dBm), and 5) reference value
adjustment. There are seven potentiometers as a
part of receiver. Micro switch denoted as
WAVELENGTH sets the wavelength for the
measurement according to the selected photo
detector. Other switches activate and deactivate
100 kHz and 1 MHz filters, sets the output
impedance of analogue channel and output digital
signal.
3 Multimedia Guide
There was created the multimedia guide in the
Czech language illustrating the possibilities of the
educational communication setup. The main
purpose of this guide was to easy the student first
steps in the area of labs from the fibre optics.
According to the original documentation from Spain
there was created the multimedia guide of following
tasks: measurement of optical power, measurement
of optical fibre attenuation using the method of
insertion attenuation, spectral dependence of optical
fibre attenuation, influence of surrounding optical
radiation, interconnection of optical fibers using ST
connector and measurement of interconnection
reproducibility, measurement of transfer WA
characteristics of optical radiation source,
measurement of power stability of optical radiation
sources, measurement of VA characteristics of
optical radiation sources, modulation properties of
optical radiation sources, spectral dependence of
photo detectors, photo detectors sensitivity, photo
detectors bandwidth, analogue signal transmission,
audio signal transmission, digital signal
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