Preliminary report type experiment name: (( Measurement of loss due to connectio
ID: 2076186 • Letter: P
Question
Preliminary report
type experiment name: (( Measurement of loss due to connection of optical connector ))
In configuring various transmission lines from 10 [cm] to several [km] when operating an optical communication system using optical fiber
An optical connector for connecting an optical fiber, emitting light, and connecting to a light receiving element module is characterized by its characteristics, circuit, transmission line condition,
Depending on the suitability of the handling, the cost for the system, and the workability, it is necessary to vary the amount. Before the initial optical fiber itself
At present, the transmission loss is reduced from several hundred [dB / km] to several [dB / km] or less.
Give me details answer for following 3pag :
1-purpose of experiment?
2-Experiment theory?
3-Refrance?
Explanation / Answer
1. Testing is used to evaluate the performance of fiber optic components, cable plants and systems. As the components like fiber, connectors, splices, LED or laser sources, detectors and receivers are being developed, testing confirms their performance specifications and helps understand how they will work together. Designers of fiber optic cable plants and networks depend on these specifications to determine if networks will work for the planned applications.
2. STUDY OF BENDING LOSS AND PROPAGATION LOSS IN OPTICAL FIBRE
OBJECTIVE:
The objective of this experiment is to measure the propagation loss and the bending loss in the optical fibre.
Theory:
• Attenuation loss (or path propagation loss) is the reduction in power density (attenuation) of an electromagnetic wave as it propagates through space. Attenuation loss is a major component in the analysis and design of the link budget of a telecommunication system.
• Attenuation occurring as a result of either a bend in an optical fiber that exceeds the minimum bend radius or an abrupt discontinuity in the core/cladding interface is called bending loss. The incident light rays strike the boundary between the core and the cladding at an angle less than the critical angle and enter the cladding, where they are lost
PROCEDURE:
i)To find propagation loss:
1. Connect the power supply to the board.
2. Make the following connections
a) Function generators 1 KHz sine wave output to input 1 socket of emitter 1 circuit via 4mm lead.
b) Connect 0.5m optic fiber between emitter 1 output and detector 1’s input.
c) Connect detector 1 output to amplifier 1 input socket via 4mm lead.
3. Switch ON the power supply.
4. Set the oscilloscope channel 1 to 0.5V /div and adjust 4-6 div amplitude by using x1 probe with the help of variable pot in function generator block input 1 of emitter 1.
5. Observe the output signal from detector t p 10 on CRO.
6. Adjust the amplitude of the received signal as that of transmitted one with the help of gain adjusts pot in AC amplifier block. Note this amplitude and name it V1.
7. Now replace the previous FO cable with 1m cable without disturbing any previous setting.
8. Measure the amplitude at the receiver side again at output of amplifier 1 socket. Note this value and name it V2.
9. Calculate propagation (attenuation) loss with the help of following formula
V1/V2 = exp(-(L1+L2))
Where is loss in nepers/m
1 neper = 8.686dB
L1 = length of shorter cable (0.5m)
L2 = length of longer cable (1m)
ii)To find bending loss
1. Repeat all steps from 1-6 of the above procedure using 1m cable.
2. Wind FO cable on the Mandrel and observe the corresponding AC amplifier output on CRO. It will be gradually reducing showing loss due to bends.
3.Reference:
http://www.thefoa.org/tech/ref/testing/5ways/fiveways.html