Laser Diode Intensity Modulation And Demodulation Trainer
Laser Diode Intensity Modulation and Demodulation Trainer has
been developed to conduct studies on laser Diode, optical fibres and
optical communication methods, by signal transmission. Practical
experience on this Trainer carries great educative value for Science
& Engineering Students.
Experiments:
Characterisation of a Laser Diode :
- Optical Power (Po) of a Laser Diode Vs Laser Diode Forward current (I).F
- Monitor Photodiode Current (I ) Vs Laser Optical Power Output (Po). M
Study of Automatic Current Control (ACC) or Automatic Power Control (APC) Modes of Operation :
- Comparison of ACC and APC Modes of Operation
Design and Evaluation of an Laser Diode (LD) Analog I System M :
- Vo Vs Vin at Specified Optical Carrier Power Levels, Po
- Determination of Vin (max) at Specified Po for Distortion-free Vo
Design and Evaluation of Laser Diode LD Digital Transmission System :
- Risetime and Falltime Pulsewidth Distortions and Determination of Propogation Delay
Transmission of Laser through an Optical Fibre :
- To measure loss in dB of Step-index Multimode plastic Fibre Patchcord
- To measure loss in dB of Graded-Index, Multimode Glass Fibre Patchcord
- To measure loss in dB of Two Patchcords connected by the in-line Adaptor
Laser Free Space Communication :
- Analogue Free Space Communication System
- Digital Free Space Communication System
Determination of Numerical Aperature of PMMA Fibre Cable
The Trainer consists of the following built-in parts:
Laser Diode Transmitter unit having following built-in parts :
- Laser Diode Transmitter Module
- 6V DC at 100mA, IC Regulated Power Supply internally connected
- SPDT switch to select Automatic Current Control (ACC) or Automatic Power Control (APC)
- Potentiometer to set power output
- Adequate no.of other electronic components
- Mains ON/OFF switch, Fuse and Jewel light
Laser Diode Receiver unit having following built-in parts :
- Laser Diode Receiver Module
- PIN Diode for measuring power of Laser Diode
- Potentiometer to set voltage output
- Adequate no.of other Electronic Components
- 6V DC at 100mA, IC Regulated Power Supply internally connected
Special Feature :
- Two-metres PMMA Plastic Fibre Patchcord (Cable-1)
- Two-metres GI/mm Glass Fibre Patchcord (Cable-2)
- In-line SMA Adaptor
- Numerical Aperature measurement Jig
- Mandrel
- The units are operative on 230V ±10% at 50Hz A.C. Mains
- Adequate no. of Patch cords stackable 4mm spring loaded plug length ½ metre
- Good Quality, reliable Terminal/Sockets are provided at appropriate places on panel for connections / observation of waveforms
- Strongly
supported by detailed Operating Instructions, giving details of Object,
Theory, Design Procedures, Report Suggestions and Book References
- Weight : 4 Kg. (Approx)
- Dimension : W 340 x H 110 x D 210
Other Apparatus Required:
- AF/RF Generator 10Hz to 1 MHz
- Three Digital Multimeter
- Cathode Ray Oscilloscope 20MHz