Specfications

• Transmitter: 2 fiber optics LED
• Transmitter 01: Peak wavelength of emission 950nm Infrared (SFH 450V)
• Transmitter 02: Peak wavelength of emission 660nm (SFH756V)
• Receiver: 2 photo detector
• Receiver 01: Photo transistor with responsivity of 80μÁ/μW (SFH 350V)
• Receiver 02: Photo detector with TTL logic output (SFH 551V)

Modulation techniques

• Digital communication with pulse code modulation (PCM) using Motorola MC145502 CODEC chip

Coding/ decoding

• Manchester coding/decoding technique
• Noise generator: White noise source output
• Amplitude: 0 ~ 5Vpp
• PRBS generator: 16-bit switch selectable
• Clock: 32 K z, 64 K z, 128 K z
• Bit error rate: 10-bit counter with LED
• Measurement: indication upto 255 count
• Multiplexing: Time division multiplexing, 16 channels (64 Kbits/Sec)
• Frame marker: Two 8-bit user selectable markers in alternate frames
• Data rate: 1.024 MBits / Sec
• Voice PCM: 2 channels voice PCM with telephone hand sets (A Law)
• Analog input: 1Vpp
• Analog bandwidth: 300 KHz
• FWHM spectral width: 100 nm
• 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, stepindex,multimod
• Core refractive index-n1: 1.492
• Clad refractive index-n2: 1.406
• Numerical aperture: 0.50
• Acceptance angle: 60º
• Fiber diameter: 1000 microns
• Outer diameter: 2.2mm
• Numberof Fibers:  4
• Fiber length: 1Meter,3Meter
• SwitchFaults: 8switch faults
• Test points: 45 test points
• Interconnections: 2mmbanana sockets
• Power supply: GND,+5V,+12V, -12V

Experiments

• Setting up a fiber optic analog link and digital link
• Study of losses in optical fiber:
• - Measurement of propagation loss and bending loss
• Measurement of numerical aperture
• Characteristics study of LED's and Photo detectors
• Study of time division multiplexing using 16 data channels
• Study of framing in synchronous time division multiplexing
• Study of marker in time division multiplexing
• Measurement of bit error rate
• Study of eye pattern
• Study of manchester coding and decoding
• Study of PCM Voice coding and frequency response of a CODEC chip
• Forming PC to PC Communication link using optical fiber and RS-232 interface
• Switch faults