FIBRE OPTICS UNIT-1

Optical fibre based on the principle of

• total internal reflection.

• total internal refraction.

• diffraction.

• interference.

Tags

NGSS.HS-PS4-5

A measurement of the ability of an optical fibre to capture light is called

• acceptance angle.

• cladding.

• numerical aperature.

• critical angle.

The unit of Numerical aperature is

• meter

• degree

• Coulomb per meter

• no unit.

Which of the following statement is correct?

• Refractive index of core and cladding are equal.

• Refractive index of core is more then that of cladding.

• Refractive index of core is less then that of cladding.

• Refractive index of core is less or equal to that of cladding.

Which part is not included in the fiber-optic communication system?

• Transmitter

• Transmission channel

• Transformer

• Receiver

The function of cladding is

• to produce refraction of rays.

• to produce total internal reflections of rays.

• to produce transmission of Ray's.

• to provide a firm support to the core glass.

Which is an advantage of optical communication links over using transmission lines or waveguides?

• A.Small size

• B.Extremely wide bandwidths

• C.Immunity to electromagnetic interference (EMI)

• D.Lower cost

• E.All the above

The most common light used in fiber-optic links is

• A.Infrared

• B.Red

• C.Violet

• D.Ultraviolet

The loss (attenuation) of signal in optical fiber is due to

• A. Scattering

• B. Absorption

• C. Macrobending

• D. Microbending

• E. All the above

What makes optical fibers immune to EMI?

• A. They transmit signals in as light rather than electric current

• B. They are too small for magnetic fields to introduce current in them

• C. Magnetic fields cannot penetrate the glass of the fiber.

• D. They are readily sheilded by outer conductors in cable