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Microwave & Optical Communication Lab Manual
BUCHEPALLI VENKAYAMMA
SUBBAREDDY ENGINEERING COLLEGE (Approved by AICTE & Affiliated to JNTU, Kakinada)
Kurnool Road, CHIMAKURTHY 523 226, Prakasam DT., A.P.
MICROWAVE & OPTICAL COMMUNICATION LAB
MANUAL
IV ECE (I-SEM)
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Microwave & Optical Communication Lab Manual
INDEX
S.NO NAME OF THE EXPERIMENT
PAGES
REMARKS
FROM TO
Part A ( Any seven Experiments)
1 Reflex Klystron characteristics.
2 Gun Diode characteristics
3 Measurement of frequency & Wavelength
4 Directional Coupler Characteristics.
5 Attenuation measurement.
6 Impedance and frequency measurement.
7 Waveguide parameters measurement.
8 Scattering parameters of circulator.
9 Scattering parameters of Magic Tee.
Part B ( Any Five Experiments)
10Characterization of LED.
11Characterization of Laser Diode.
12Intensity modulation of Laser outputthrough an optical fiber.
13Design of fiber optic digital link fortransmission of digital signals.
14Measurement of Numerical Aperture.
15Measurement of Losses for analog opticallink.
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Microwave & Optical Communication Lab Manual
Exp.No: Date:
REFLEX KLYSTRON CHARACTERISTICS
AIM: To Study the characteristics of the Reflex Klystron tube and to determine its electronic
tuning range.
APPARATUS REQUIRED:
1. Klystron tube
2. Klystron power supply
3. Isolator
4. Frequency meter
5. Variable attenuator6. Detector mount
7. C.R.O
EXPERIMENTAL SETUP:
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Isolator
Variableattenuator
FrequencyMeter
DetectorMount
Klystron
PowerSupply
KlystronMount CRO
Slotted linesection
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PROCEDURE:
Mode studies:
1. Connect the components and equipment as shown in experimental setup.
2. Keep the control knob of Klystron power supply as below:
Mode switch: CW
Beam voltage knob: Fully anti-clockwise
Repeller voltage knob: Fully clockwise
Meter switch: Cathode voltage position
3. Rotate the frequency meter at one side.
4. Switch on the klystron power supply, CRO and cooling fan for the Klystron tube. Wait for 1-2
minutes for the klystron to respond.
5. Cathode voltage knob at minimum position gives a beam voltage of 235 V. Observe beam current
on the meter by changing meter switch to beam current position. "The beam current should not be
more than 30mA"
6. Now change the meter switch to repeller voltage position.
7. Select proper range for the power meter so that power output of maximum mode will not exceed
the meter range.
8. Decreasing the reflector voltage, record output Voltage.
10. Plot Output Voltage versus repeller voltage to get mode curves.
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Microwave & Optical Communication Lab Manual
MODEL GRAPH:
OBSERVATIONS:
Result:
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S. No. Repeller voltage(Volts ) Voltage output (mV)
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Exp.No: Date:
GUNN DIODE CHARACTERISTICS
AIM: To study the V-I Characteristics of Gunn diode
APPARATUS REQUIRED:
1. Gunn power supply
2. Gunn oscillator
3. PIN modulator
4. Isolator
5. Frequency Meter
6. Variable Attenuator
7. Detector mount
8. Slotted Section
9. CRO.
EXPERIMENTAL SETUP :
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PROCEDURE:
. Set the components as shown in fig.
. Initially set the variable attenuator for maximum attenuation.
. Keep the control knobs of Gunn Power Supply as below:
Gunn Bias Knob - Fully anticlockwise
PIN bias knob - Fully anticlockwise
PIN mode frequency - Any position
Mode switch - CW Mode
. Set the micrometer of Gunn Oscillator at 7 mm for required frequency of operation.
. Switch ON the Gunn Power Supply and cooling fan.
6. Measure the Gunn diode current corresponding to the various voltage controlled by
Gunn Bias knob through the panel do not exceed the bias voltage above 10.5V
7. Plot the voltage & current reading on the graph.
8. Measure the threshold voltage which corresponds to maximum current.
OBSERVATION:
S.no Gunn Bias Voltage (V) Gunn Diode Current (I)
MODEL GRAPH:
Current voltage characteristics of Gunn oscillator:
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RESULT:
Exp.No: Date:
MEASUREMENT OF FREQUENCY & WAVELENGTH
AIM: To determine the frequency and wavelength of a microwave signal.
APPARATUS REQUIRED:
1. Klystron Power supply,
2. Isolator.
3. Klystron mount
4. Frequency meter.5. Variable Attenuator.
6. Slotted line section.
7. Tunable probe.
8. Matched load.
9. CRO/VSWR
EXPERIMENTAL SETUP:
PROCEDURE:
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Isolator
Variableattenuator
FrequencyMeter
Matchedload
KlystronPowerSupply
KlystronMount
Slotted linesection
Tunableprobe
CRO
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1. Set the components & equipment as shown in the fig.
2. Set the variable attenuator at no attenuation position.
3. First connect the matched termination after slotted section.
4. Keep the control knobs of klystron power supply as below:Meter switch - off
Mod switch - AM
Beam voltage knob - Fully anti-clock wise
Reflector voltage knob Fully clock wise
AM Frequency and amplitude knob Mid position
5. Switch ON the Klystron power supply, CRO and cooling fan.
6. Tune the meter switch of power supply to beam voltage position and set beam voltage at
230v with help of beam voltage knob, current a round 15 to 20mA.
7. Tune the frequency meter to get a dip minimum voltage on CRO and note down the
frequency directly from frequency meter.
8. Move the tunable probe along with the slotted line to get the max. display of waveform in
CRO. Move the tunable probe to a min Gain position and record the probe position i.e. d1.
9. Move the probe to next min position and record the probe position again i.e d2.
10. Calculate the guide wave length as twice the distance between two successive min.
position obtained as above.
g =2(d1-d2)11. Measure the wave guide inner broad dimension a which will be around 22.86mm
for X- band.
c=2a
12. Calculate the frequency by following equation
__________
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Microwave & Optical Communication Lab Manual
F=c/D = c ( 1/ g2 +1/ c2)
13. Verify the frequency obtained by the frequency meter.
PRECAUTIONS:
1. Loose connection are avoided
2. Note down the readings without any parlance errors.
RESULT:
Exp.No: Date:
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DIRECTIONAL COUPLER CHARACTERISTICS
AIM: To measure Coupling, Directivity, Insertion loss and Isolation of a directional coupler.
APPARATUS REQUIRED:
1. Klystron Power supply,
2. Reflex klystron.
3. Isolator.
4. Frequency meter.
5. Variable Attenuator.
6. Directional Coupler.
7. Matched load.
8. Detector Mount.
9. CRO/VSWR Meter
10. Wave guide stands
EXPERIMENTAL SETUP-1:
EXPERIMENTAL SETUP-2:
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Isolator
Variableattenuator
FrequencyMeter
DetectorMount
KlystronPowerSupply
KlystronMount CRO
Slotted linesection
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Microwave & Optical Communication Lab Manual
PROCEDURE:
1. Set up equipment as shown in fig. Without the directional coupler i.e., directly connect
crystal detector with CRO in order to measure Input after attenuator.
2. Set the variable attenuator at maximum position.
3. Keep the control knobs of klystron power supply as below:
Meter switch --- OFF
Mod switch --- AM
Beam voltage knob --- fully anti- clockwise.
Reflector voltage --- fully clockwise.
AM Amplitude knob --- around fully clockwise.
AM Frequency knob --- around mid position.
4. ON the klystron power supply, CRO and cooling fan .
5. Connect the detector mount to the slotted line and tuning for the maximum o/p.
6. Note down the output voltage from CRO and consider it as V1.
7. Insert the directional coupler connect it as shown in the experimental set up 2
8. Record the output voltages at port2 and port 3
9. using the outputs calculate insertion loss, isolation loss and coupling factor.
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Isolator
Variableattenuator
FrequencyMeter
Directionalcoupler
KlystronPower
Supply
KlystronMount
Matchedload
Slottedline
section
DetectorMount
CRO
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DIRECTIONAL COUPLER
PRECAUTIONS:
1. Loose connection are avoided
2. Note down the readings without any paralleled errors.
3. Beam current should not exceed 20mA
RESULT
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Microwave & Optical Communication Lab Manual
Exp.No: Date:ATTENUATION MEASUREMENT
AIM: To study the substitution method for measurement of attenuation and Hence to determine the
attenuation due to a component under test.
APPARATUS REQUIRED:
1. Klystron power supply.
2. Klystron Mount.
3. Isolator.
4. Frequency Meter.5. Variable attenuator.
6. Detector mount.
7. Test attenuator.
8. CRO.
9. Cooling Fan
10. Waveguide stands
EXPERIMENTAL SETUP:
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PROCEDURE:
1. Set the components and equipments as shown in figure above.
2. Initially set the variable attenuator for maximum attenuation.
3. Terminate the receiving end with unknown load.
4. Keep the control knob of Klystron power supply as follows,Beam voltage : Off
Mod-switch : Am
Beam voltage knob : Full anti clockwise
Reflector voltage knob : Full clockwise
Am-amplitude knob : Full clockwise
Am frequency & amplitude knob : Mid position
5. Switch On the klystron power supply, VSWR meter & cooling fan.
6. Switch On the beam voltage switch and set beam voltage at 300 v
7. Rotate the reflector voltage knob to get deflection in VSWR meter
8. Slowly decrease the micrometer reading and note down the Attenuation from the VSWR meter.
9. Plot a Graph between Attenuation and Micrometer reading.
PROCEDURE FOR FIXED ATTENUATOR:
1. Repeat up to step 4 and insert CRO in place of VSWR meter
2. Tune the bench for maximum output and note down the output voltage as V1.
3. Now insert the fixed attenuator in between slotted section and detector mount and note down
the output voltage as V2
4. Using V1 and V2 calculate the attenuation.
Model graph:
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Microwave & Optical Communication Lab Manual
OBSERVATIONS:
Sr. No. Screw Gauge Reading (mm) Attenuation in Decibel
Precautions:
1. Loose connections are avoided
2. Note down the readings without any error
3. Beam current should not exceed 20mA
Result:
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Microwave & Optical Communication Lab Manual
Exp.No: Date:
SCATTERING PARAMETERS OF CIRCULATOR
AIM: To study operation of circulator and hence measure insertion loss and isolation of a circulator.
APPARATUS REQUIRED:
1. Klystron Power Supply,
2. Klystron Mount,
3. Variable attenuator,
4. Matched termination,5. Crystal detector,
6. VSWR meter,
7. Isolator,
8. Circulator.
EXPERIMENTAL SETUP:
THREE PORT CIRCULATOR:
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Isolator
Variableattenuator
FrequencyMeter
DetectorMount
KlystronPowerSupply
KlystronMount CRO
Slotted linesection
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Microwave & Optical Communication Lab Manual
Insertion loss: The ratio of power supplied by a source to the input arm, to the power detected by a
detector in the coupled arm with all other ports matched terminated.
Isolation: Ratio of power fed in Arm 1 by a matched generator to the power detected in port 3 by a
detector with ports 2 terminated in matched loads.
PROCEDURE:
1. Set up the equipment as shown in figure without the ferrite device i.e., directly connect detector
with CRO in order to measure input.
2. Set the variable attenuator at maximum position.
3. Keep the control knob of Klystron power supply as below:
Mode Switch : AM
Beam Voltage Knob : Fully Anti Clockwise
Repeller Voltage Knob : Fully Clockwise
Meter Switch : Cathode Voltage Position
4. Turn 'ON1 the klystron power supply, CRO and cooling fan.
6. Measure the input voltage and consider it as V1.
CIRCULATOR:
1. Carefully remove the detector setup and insert the circulator as in the set-up, with power fed
through port I.
2. Measure output at port 2 with port 3 terminated in matched load and consider it as V2
3. Now Measure outputs at port 3 with port 2 terminated in matched load and consider it as V2
4. Determine insertion loss and isolation loss by using the readings
RESULT: Operation of circulator is studied and insertion loss and isolation of a circulator ismeasured.
Exp.No: Date:CHARACTERISTICS OF THE MAGIC TEE
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Microwave & Optical Communication Lab Manual
AIM: To study the Magic Tee.
APPARATUS REQUIRED:
1. Klystron Power Supply
2. Klystron Mount
3. Isolator
4. Attenuator
5. Frequency meter
6. VSWR meter7. Magic tee
8. Matched terminations.
MAGIC TEE:
EXPERIMENTAL SETUP:
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Microwave & Optical Communication Lab Manual
For Input measurement
For coupled/isolated measurement:
PROCEDURE:
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Isolator
Variableattenuator
FrequencyMeter
DetectorMount
KlystronPowerSupply
KlystronMount CRO
Slotted linesection
Isolator
Variableattenuator
FrequencyMeter
Magictee
KlystronPowerSupply
KlystronMount
Matchedload
Slotted linesection
DetectorMount
CRO
Matchedload
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1. Setup the equipment as shown in fig (a).2. Energize the microwave source for particular frequency and tune the detector mount
for maximum output.
3. Note down the reading as input Voltage.
4.Without disturbing the position of variable attenuator carefully place the Magic tee after slottedline keeping H-arm connected to the slotted line, detector mount to E-arm and matched terminationto arm 1 and 2.note down the reading of CRO .Let it be V4.
5. In the same way measure V1 & V2 by connecting detector on these ports one by one.
6. Determine the isolation between port 3 and 4 dB.
7. Determine the coupling coefficient for port P1& p2.
Result:
Exp.No: Date:VSWR MEASUREMENT
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Microwave & Optical Communication Lab Manual
AIM: To Measure the VSWR and Reflection Coefficient of an Wave Guide..
APPARATUS REQUIRED:
1. Klystron Power Supply2. Klystron Mount
3. Isolator
4. Attenuator
5. Frequency meter
6. CRO
7. Slotted Section
8. Matched terminations.9. Detector Mount
FORMULA:VSWR = V max / V min
EXPERIENTAL SETUP:
PROCEDURE:
1. Set up equipment as shown in fig. Without the directional coupler i.e., directly connect
crystal detector with CRO in order to measure Input after attenuator.
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Isolator
Variableattenuator
Frequency
Meter
Detector
Mount
KlystronPowerSupply
Klystron
Mount CRO
Slotted linesection
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2. Set the variable attenuator at maximum position.
3. Keep the control knobs of klystron power supply as below:
Meter switch --- OFF
Mod switch --- AM
Beam voltage knob --- fully anti- clockwise.Reflector voltage --- fully clockwise.
AM Amplitude knob --- around fully clockwise.
AM Frequency knob --- around mid position.
4. ON the klystron power supply, CRO and cooling fan .
5. Adjust the probe carriage to measure Vmax and Vmin readings
6. Using formula find out VSWR and Reflection Coefficient
Result : The VSWR and reflection coefficient of an wave guide were determined.
Exp.No: Date:
STUDY OF FIBER OPTIC DIGITAL LINK
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Microwave & Optical Communication Lab Manual
AIM:
The objective of this experiment is to study a Fiber optic digital link. In this experiment you
will study the relation between the input signals & Received signals.
EQUIPMENT REQUIRED:
1. DL-01 Transmitter and Receiver.
2. Power Supply
3. 20MHz Dual Channel Oscilloscope
4. 1MHz Function Generator
5. 1meter Fiber Cable.
Experimental Setup:
PROCEDURE:
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1. Slightly unscrew the cap of LED SFH 756V (660nm).Do not remove the cap from the
connector. Once the cap is loosened, insert the fiber into the cap. Now tight the cap by screwing it
back.
2. Connect the power supply cables with proper polarity to kit. While connecting this,
ensure that the power supply is OFF. Now switch ON the power supply.3. feed the TTL signal of about 1KHz square wave, to IN post of buffer section.
4. Connect the other end of Fiber to detector SFH 551v very carefully as per the
instructions in step.1
5 . Obse r ve t he r ece i ved s i gna l on CRO as O / P .
6. To measure the digital bandwidth of the link, vary the frequency of the input
from100Hz on wards and observe the effect on received signal.
EXPECTED GRAPH:
RESULT:
Exp.No: Date:
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Microwave & Optical Communication Lab Manual
CHARACTERISTICS OF LED
AIM:
To study the Characteristics of a low intensity Optical Source.
APPARATUS:
1. Link-A Kit
2. 1-Meter Fiber Cable
3. Ammeter-1
4. Voltmeter-1
5. CRO - 20 MHz
6. Power supply
7. Jumper connecting wires
SETUP:
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Microwave & Optical Communication Lab Manual
PROCEDURE:
1. Make jumper and switch Settings as shown in the jumper diagram.
2. Connect the ammeter with the jumper connecting wires (JP3).
3. Connect the voltmeter with the jumper wires to JP5 and JP2 as shown in figure.4. Switch on the power supply keep the potentiometer P3 in its minimum position ,P4 is
used to control biasing voltage of the LED.
5. Change S3 position to VI mode.
6. To get the VI characteristics of LED, rotate P3 slowly and measure forward current and
corresponding forward voltage of the LED.
7. Take number of such readings for forward voltage, forward current and calculate optical
power by
Optical power Po= Pi *1.15%
8. Plot the Graphs of forward current and forward voltage, Optical power and Forward
current.
RESULT:
Exp.No: Date:
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Microwave & Optical Communication Lab Manual
STUDY OF LOSSES IN OPTICAL FIBRES
AIM:
1. To study the various types of losses in Optical Fiber.
2. To measure the bending losses in the Optical Fiber3. To measure the Propagation & attenuation loss in the Optical Fiber
EQUIPMENT REQUIRED:
1. Analog Fiber optic trainer Kit (Transmitter & Receiver)
2. Fiber optic links of 1m and 3m length
3. 20Mhz CRO
4. Meter Scale
5. Power Supply
EXPERIMENTAL SETUP:
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EXPERIMENTAL PROCEDURE:
Measurement of Bending Loss:
1. Connect the Circuit as Shown in diagram
2. Connect 1m cable in between the transmitter and receiver.
3. Switch on the power supply.
4. Using function generator set an input signal and observe the output in the CRO.
5. Now turn the optical cable with some radius and observe the output in the CRO
6. Decrease the diameter of the turn and note down the readings.7. Now compare the readings for different diameters.
.
Measurement of Propagation Loss:
1. Connect the Circuit as Shown in diagram
2. Connect 1m cable in between the transmitter and receiver.
3. Switch on the power supply.
4. Using function generator set an input signal and observe the output in the CRO and note
down the readings.
5. Now replace the 1m cable with 3m cable for the same input and note down the readings of
CRO.
6. Now loss can be observed
RESULT:
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AL-01 Transmitter AL-01 Receiver
FunctionGenerator
CRO
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Exp.No: Date:
MEASUREMENT OF NUMERICAL APERTURE
AIM:
To Determine the Numerical Aperture of an optical cable.
APPARATUS:
1. Optical Fiber Analog Transmitter kit
2. Numerical Aperture Measurement Unit / NA JIG
3. Measuring Scale4. Power Supply
Numerical Aperture measurement unit
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SETUP CONNECTION:
PROCEDURE:
1. Sl ightly unscrew the cap of LED .Do not remov e the cap f rom the connector.
Once the cap is loosened, insert the fiber into the cap. Now tight the cap by screwing it back.
2. Connect the power supply cables with proper polarity to kit. While connecting
th is , ensure that the power supply is OFF. Now switch ON the power supply.
3. Insert one end of fiber in to NA measurement unit as shown in figure. Adjust the fiber such
that its tip is 0.5cm from the screen.4. Gently tighten the screw to hold the fiber firmly in place.
5. The fiber will project a circular patch of red light on to the screen. Now measure the
diameter of the circular patch of red light in two perpendicular directions (BC and DE in Fig).
The mean radius of the circular patch is given by X = (DE +BC)/4
6. Carefully measure the distance d between the tip of the fiber and the illuminated screen.
The Numerical Aperture of the fiber is given by
NA = Sin () =X/ ( (d2+X2)
7. Repeat steps 3 to 6 for different values of d. compute the average value of Numerical
aperture.
RESULT: