transmission, influence of fibre flection to optical
fibre attenuation, measurement of optical aperture,
influence of nonideal interconnection of optical
fibres to their attenuation, measurement of optical
branch, measurement of attenuation of optical
attenuator, spectral dependency of optical attenuator
attenuation, comparison of noise properties of
several photodetectors, WDM: multiplexing and de-
multiplexing, WDM transfer, transmission sensor,
reflection sensor, liquid level sensor, and
transmission sensor of liquid presence.
Multimedia guide includes two DVD-ROM,
teacher video manual is in the first one, and students
one is in the second. Teacher video manual has also
the results of the measurements included in the
manual while the students’ video manual does not
have them.
The guide was created in Nero 11 Shareware,
namely in Nero Video [4]. Nero Video is used for
complex editing of multi tracks with special effects
included. The created guide was then burned in
Nero Burning ROM.
Measured labs are sorted in the multimedia guide
according to their complexity. First labs are
introductory ones, they demonstrate the basic
functions of the educational communication setup.
Results of measurements, which are included in the
teacher video manual, are only informatory ones.
The multimedia guide starts automatically after
DVD ROM insertion into the DVD ROM drive, the
main screen of video manual is opened. Each lab is
included in the DVD ROM as a special chapter.
Not all chapters are displayed in one screen and,
therefore , there are buttons for listing among
screens with several labs.
Fig. 8 Multimedia Guide – Chapters Menu
3.1Characteristics of Labs in Video Manual
Measured labs follow the following order in the
v
ideo manual
- main screen with the name of the lab together
with task assignment
- list of used measurement apparatuses and
accessories
- if there is some accessory which wasn’t used in the
previous labs, it is shown graphically
- setting the values at transmitter and receiver
(displays values on screen)
- playing the video with selected parameters of the
measurements
- measuring procedure with tables if necessary
- showing the results , tables are empty in the
students manual
- measurement notes
4 Sample Lab 1
Measurement of photo detector bandwidth was
randomly selected as lab 1[3].
4.1 Task
Measure the photo detector bandwidth. Measure the
influence of cut-off voltage on the detector
bandwidth.
4.2 Devices, Aids, Materials
Oscilloscope, volt meter, signal generator (square
and sine signal, maximum frequency 10 MHz),
cables, cleaning set.
4.3 Practice
Using the buttons of multifunctional transmitter
module set the following: input from signal
generator, channel CH1, sine signal, frequency 1
kHz, optical output: source #4 (LED 850 nm) for
channel CH1. At multifunctional receiver module
set the function Analogue measurement, photo
detector #1 (Si 1 mm) as optical output, wavelength
850 nm, output impedance 75 Ohm. Interconnect
signal generator with receiver module, its DC input.
Connect the first probe of the oscilloscope to testing
output of the receiver module and second probe with
test point TP10 and GND. Use the connecting cable
and connect the corresponding output of the
transmitter module with the corresponding input of
the receiver module. Connect volt meter to the test
point TP17 and GND, you will measure the photo
detector cut-off voltage (U
BIAS
).
4.4 Results
In table 1 and figure 9, there are measured results of
the selected lab obtained using Promax EF 970
Fibre Optics Communication Setup for several
voltage values.
Latest Trends in Information Technology
(135 Seiten)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern