Specifications

• Transmitter: Two Siemens fiber optics LED
• Transmitter 01: Peak wavelength of emission 660nm red visible (SFH756V)
• Transmitter 02: Peak wavelength of emission 950nm (SFH450V)
• Receiver: Two fiber optic photo detector
• Receiver 01: PIN photo diode with responsivity of 0.3 μA (SFH250V)
• Receiver 02: Photo Detector with TTL Logic output (SFH551V)

On-Board Signals

• SineWave
  • Frequency    : 1Hz ~ 10KHz
  • Amplitude    : 0 ~ 4 Vpp
• TTL-Square Wave
• Frequency: 1Hz ~ 10KHz

Modulation techniques

• Direct intensity modulation - Frequency modulation
• Pulse width modulation (PWM) (with variable clock 4 K z, 8 KHz, 16 KHz, and 32 K z)
• Pulse position modulation (PPM) (with variable clock 4KHz, 8 KHz, 16 KHz, and 32 K z)

Driver Circuit

• Analog and digital configuration for 660 nm and 950 nm LED

Analog/digital bandwidth

• 2MHz / 5MHz

Filter circuit

• 4 order Butter worth filters with 3.4 KHz cut-off frequency

Voice Communication

• Fiber optic voice link using dynamic mike and speaker

PC TO PC Communication

• PC to PC communication using 660 nm and 950 nm LED through RS-232 standard

RS-232 Port type

• Two 9 pin D type connector

Baud rate

• Maximum 115.2 kbps baud

Fiber optic cable

• Type: Plastic optical cable, step index, multimode

Core Refractive

• Index-n1    : 1.492
• Numerical aperture  : 0.5
• Acceptance angle    : 60o
• Outer diameter    : 2.2 mm
• Fiber lengths    : 1 and 3 Meters

Switch Faults

• 8 Switch faults are provided on board to study different effects on circuit

Test Points

• 24 test points are provided on board to observe intermediate signals

Power supply

• GND, +5V, +12V, -12V

Experiments

• Settingupa fiber optic analog Link
• Study of losses in optical fiber:
• Measurementofpropagation lossandbending loss
• Study of characteristics of fiber opticLEDand detector
• Measurement of numerical aperture
• Study of frequency modulation and demodulation using fiber optic link
• Setting up a fiber optic digital link
• Study of modulation and demodulation of light source by pulse width modulation(PWM)techniques
• Study  of  modulation  and  demodulation  of  light  source  by  pulse  position  modulation (PPM)techniques.
• Forming PC to PC communication link using optical fiber and RS-2 32 interface.
• Setting up a fiber optic voice link
• Switch faults