Advantages of fiber optics
Fiber optic links
Abdul Raoof wani
Advantages/ Merits of fiber optic:
Low Power Loss :- An optical fiber offers low power loss which
allows for longer transmission distances.
Interference :- Fiber optic cables are immune to electromagnetic
interference. It can also be run in electrically noisy environments
without concern as electrical noise will not affect fiber .
Weight:- Fiber optic cables are much thinner and lighter than
metal wires. They also occupy less space with cables of the same
information capacity. Lighter weight makes fiber easier to
Security:- Fiber optics the most secure medium available
Safety:-Since the fiber is a dielectric, it does not present a spark hazards.
Flexibility:- It is flexible and bends easily.
Cost:- The raw materials for glass are plentiful means glass can be made
more cheaply .
Less expensive:- Several miles of optical cable can be made cheaper than
equivalent lengths of copper wire. This saves your provider (cable TV,
Internet) and you money.
Thinner:- Optical fibers can be drawn to smaller diameters than copper wire.
Less signal degradation :-The loss of signal in optical fiber is less than in copper
Digital signals :- Optical fibers are ideally suited for carrying digital information,
which is especially useful in computer networks.
Non-flammable:-Because no electricity is passed through optical fibers, there is no
Medical imaging :-It is used in
bronchoscopes, endoscopes, laparoscopes .
Plumbing :-It is used to inspect sewer lines.
Electrical Insulator:- Optical fibers are made and drawn from silica
glass which is nonconductor of electricity and so there are no ground
loops and leakage of any type of current.
Early detection of cable damage:- By constantly monitoring an optical
network and by carefully measuring the time it takes light to reflect
down the fiber, splices in the cable can be easily detected.
Fiber-optic Links :
A fiber-optic link (or fiber channel) is a part of an optical fiber
communications system which provides a data connection between two
points (point-to-point connection).
It essentially consists of a data transmitter, a transmission fiber (possibly
with built-in fiber amplifiers), and a receiver.
The Design criteria are given in the following :
Primary Design Criteria
The process of communicating using an optical fiber involves the
Converting electrical signal to optical signal at the transmitter.
Transmission of optical signal to the cable.
Relaying the signal through the optical-fiber.
Receiving the optical signal at the detector
Converting the optical signal back to the electrical signal at the
To transfer a trigger signal from a noisy environment,
To isolate the signal from high voltage sources,
Eliminate ground loops,
Transfer precise timing signals over a long distance,
Have excellent system reliability,
Transmit precise timing signals over optical fiber.
Prevents ground loops and computer noise effects .
Transfers analog signals to distances of up to 3 Km (50Km with Single
Excellent signal isolation.
Short propagation delay - 200 nSec + 5 uSec/Km.
High Frequency bandwidth: DC to 10 MHz.
Very small size: only 61 x 61 x 28 mm
Low cost: $699.- per pair (Rx + Tx).