The Benchmark OFT...
A powerful, versatile, cost
effective Optical Fiber Trainer
that is ideal for:
-
Demonstrating, training and experimenting in:
- - Principles of fibre optic communications
- - Basics of digital baseband communications
- Providing a platform to do advanced experimentation and development in fibre
optic digital communications
The Benchmark OFT covers:
- Principles of fibre optics communication
- - Intensity modulation – converting electrical signals
to light signals
- - Analog and digital links
- Characteristics of fibre optics
- - Capability of using single PD to cover various (adjacent) wavelengths
- - Bending, connectorizing losses in fibre
- - Immunity to EMI/RFI
- - Numerical aperture
- - Pulse broadening in fibre optic links
- Digital communication (base band) concepts used in fibre optics
- - Time division multiplexing (TDM)
- - Framing in TDM
- - Line coding technique – Manchester coding and decoding
- - Voice PCM coding – A-Law
The OFT is ideally suited for:
- Engineering colleges/polytechnics
- Technical staff straining centres in industries that use
optical fibre based communications systems - such as the telecom,
railway, defence, industrial automation and medical industries
The benefits of using the Benchmark OFT are:
- It explains concepts, commercial fibre optic communication systems, by way
of doing experiments
- Gives a clear picture on the functional blocks involved in a fibre optic
communication system
- A single kit covers both fibre optic basics and digital communication concepts
- - All standard accessories are included in the trainer.
Only the function generator and oscilloscope are extras
- Well structured experiments - 11 experiments, covering all the above
topics, with step-by-step instructions are given in the user manual
- Comprehensively covers one semester course on fibre optic communication
- Demonstrates full duplex communication by connecting 2 trainer units
- Provides a development platform for project work
- - Allows advanced experimentation by building external circuitry
and interfacing with the trainer
The construction of the OFT:
- Modular functional blocks
- - All the functional blocks in the trainer can be isolated/substituted
wherever possible (using jumpers) - thus providing a development/project
work platform
- I/O ports to interface user built circuitry with the trainer
- Easy to understand block diagram on the front panel
- I/O BNCs to observe/measure and feed-in signals
The OFT comprises:
- Trainer Kit (transceiver)
- - 650 & 850nm LEDs in transmitter
- - Photo detector with peak sensitivity @ 650/850nm
- Plastic fibres of various lengths
- Accessories
- - NA measurement unit
- - Fiber aligning unit
- - EMI generation unit
- - Phone handsets for voice communication
- - Expansion port cables for external circuit interface
- - Special electrical patch cords to interconnect blocks, setup electrical
copper link etc.,
- Power supply
- User manual
Summary
- Single kit covering basics of fibre optics, characteristics of fibre optics and digital
communication concepts used in fibre optics
- Modular construction
- - Allows students projects through circuit building
- - Allows advanced experimentation like RS232 computer-to-computer communication,
slow scan video transfer etc.,
- Experiments covered
- - Fiber Optic analog and digital links
- - Losses in optical fibre
- - Effect of EMI/RFI
- - Numerical Aperture of plastic fibre
- - Pulse broadening effect in fibre optics communication
- - Time Division Multiplexing (TDM)
- - Time switching concept
- - Framing in TDM
- - Marker in Frames (Use of double marker as per CCITT)
- - Voice coding (PCM) – A-Law companding
- - Line coding - Manchester coding/decoding
- All standard accessories are included in the trainer. Only function generator
and oscilloscope are required additionally.
- Uses 64kbps channels for all type of data – same as ISDN,
T1, E1 standard
- Comprehensive lab manual covering all the above experiments
- Cost effective
- - More than one user per kit possibility in the lab
- Experiments in 650nm and 850nm regions using plastic fibre
- - Plastic fibres are easy to handle and safe
|
 |
|
|
|
|
