Introduction:
Basically, a fiber optic data link contains three main elements: a transmitter, an optical fiber and a receiver. The transmitter takes data previously in electrical form and transforms it into optical (light) energy containing the same information. The optical fiber is the medium, which carries the energy to the destination (receiver). At the receiver, light is converted back into electrical form with the same pattern as originally fed to the transmitter by the person who sent the message.

The advantages of optical fiber are that it allows light to be routed around corners and transported through obstructions (such as walls in buildings), just as household electrical and telephone wiring do, but with much greater signal-carrying capacity, plus being able to operate at greater distances and on foggy and rainy days.

This trainer is intended to experiment some of the above, described topics. The fiber Optic Voice Link trainer consists a (a) transmitter, (b) transmission media (fiber optic cable) and (c) a receiver.

The transmitter consists of a microphone, pre-amplifier, signal conditioner, Optical source (IR 800nm). The transmission media is 1000 mm multi-mode plastic fiber cable. The receiver consists of an optical detector (Photo diode / phototransistor), pre-amplifier, power amplifier and a loud speaker.

The fiber Optic Voice Link trainer consists of a microphone with necessary pre-amplifier, at the transmitter end and an optical detector at the receiver. The optical fiber is used as transmission media. The received signal is further amplified and the audio output is connected to a speaker. There by enabling you to transmit an audio signal and receive at the receiver. This unit has an additional facility to connect a sine wave source from any external function generator as a transmitter. This facility allows you to study the frequency response of the transmission characteristics in the audio range.

This unit is assembled in an ergonomically designed cabinet, with necessary power supplies and associated emitters, detectors, amplifiers, multi mode transmission cables. You need optional signal sources, Oscilloscope, a high impedance mulitmeter as additional equipment to successfully conducting the above objectives.

Specification:
Transmitter : Fiber optic Infra Red 820 nm peak wavelength housed in
FC adapter.Receiver : Photodiode with Peak sensitivity 880nm
Connection : Plastic fiber optic package, suitable for PMMA cable,
housed in FC Adapter
Fiber connector : Industry standard FC – FC connector
Fiber optics cable type : Plastic optical cable, step index, multimode.
Core refractive index : 1.492
Clad refractive index : 1.406
Acceptance angle : Within 60 degrees
Core diameter : 1000mm
Fiber diameter : 2.2mm
Fiber length supplied : 1 meter and 3 meter
Power supply : 5V and 12 V
Microphone with proper signal conditioner
Speaker assembly with suitable power amplifier.
All the above are available in an ergonomically designed cabinet.