EXPERIMENT NO.-3 ED-LASE

1. OBJECTIVE

1. Output power at receiver when input is pump power from a laser source .2. Band limiting filter construction3. Measurement of feedback coupler(80-20%) input and output power4. Measurement of feedback coupler (60-40%) input and output power.5. Variable attenuator Working

2. APPARATUS: - EDLASE kit, ST connectors, patch chords.

4. OBSERVATION TABLE:-

1. Pump power VS out power:- when the input pump power from the input laser source is switched on then the corresponding output power at output receiver is noted down.

Pump power(mw) Power(uw) Pump power(mw) Power(uw)

0 10 20 30 40 50 60 70 800

2

4

6

8

10

12

output power(uW)

pump power(mW)

outp

ut p

ower

(uW

)

2. Band limiting filter:- Laser pump power input is internally connected to the band limiting filter’s input and the output of the filter is connected to output of photo- receiver. is given in EDFA output and Output is given at photo receiver side

Pump power(mw) Photo receiver(uw)

(3) Feedback Coupler (80-20%):- The laser Input is connected to EDFA input and this input is divided in two coupled Output having ratio 4:1.each of the coupled output is connected to the photo receiver to observe the power at each node.

Pump power Input(mw) 80%(uw) 20% output(uw)

(4) Feedback coupler (60-40%):- The laser Input is connected to EDFA input and this input is divided in two coupled Output having ratio 3:2.each of the coupled output is connected to the photo receiver to observe the power at each node.

Input(mw) 60%(uw) 40%output(uw)

(5) Variable attenuator: - laser pump power Input is connected to the input of the EDFA(60%-40% feedback coupler ) and output of this EDFA is connected to the input of the variable ATTENUATOR and its Output is connected to photo receiver side.then the effect of the attenuation is observed for a given input power.

Input fixed Attenuation(dB) Output(uw)

5. RESULT: - From above observations, we can characterize different types of fiber optics components and effect of them on the input laser power BUT In these observations, there are some variations due to bend loss, joint loss etc.