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Table 1 Data of photo detector bandwidth

Fig. 9 Photo detector bandwidth

5 Sample Lab 2

Spectral dependence of insertion losses of variable

optical attenuator was randomly selected as lab 2

[3].

5.1 Task

Measure spectral dependence of insertion losses for

a variable optical attenuator.

5.2 Devices, Aids, Materials

Cable patchcord, variable attenuator, cleaning

components.

5.3 Practice

After connecting outputs of transmitter and inputs of

receiver, setting the values of optical source current

according to the instructions, connecting variable

attenuator and setting its position according to the

instruction list we measure the real attenuation of

attenuator for several wavelengths. Transmitter is

set by following way. Input DC without connection

on channel CH1, mA measurement for CH1, photo

emitter #3 (LED 660 nm) on channel CH1 is optical

output. And receiver is set by following way. DC

measurement as function, photo detector #4 (PIN Si

2.5 mm) on analogue channel is optical input and

measurement is realized for 660 nm wavelength.

By setting 0 dB value at the variable attenuator,

the new reference value is realized. This is followed

by setting the values of attenuation according to the

table 2 and we write real values of attenuation

(measured ones) in the table. Measurements are also

repeated for other wavelengths. Measured values of

attenuation are compared in table and shown in

graph.

Value of optical source current is set according

to the table 2. Photo detector #2 (PIN InGaAs) was

used for measurements for 1300 nm wavelength.

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