What principle does fiber optic communication rely on?
A
Reflection from mirrors
B
Total internal reflection
C
Refraction through lenses
Analysis & Theory
Fiber optics transmit light signals using total internal reflection within the core.
Which component converts electrical signals into optical signals?
Analysis & Theory
The transmitter uses a laser or LED to convert electrical signals into light.
What is the role of a photodiode in fiber optics?
A
Generate optical pulses
C
Convert light signals to electrical signals
D
Detect EMI interference
Analysis & Theory
A photodiode is used in the receiver to convert optical signals into electrical signals.
Which of the following is an advantage of fiber optic communication?
D
High bandwidth and secure transmission
Analysis & Theory
Fiber optics offer high bandwidth and are immune to electromagnetic interference.
Which type of fiber is used for long-distance communication?
Analysis & Theory
Single-mode fiber supports long-distance, high-bandwidth communication.
What is the function of cladding in an optical fiber?
C
Ensures total internal reflection
Analysis & Theory
Cladding has a lower refractive index to maintain total internal reflection inside the core.
Which of the following is a common application of fiber optics?
Analysis & Theory
Fiber optics are widely used in cable TV, internet, and telecommunication.
Which of these causes signal loss in optical fibers?
C
Scattering and absorption
Analysis & Theory
Losses in fibers are due to scattering and absorption of light inside the fiber material.
What device is used to amplify optical signals directly in fiber communication?
C
EDFA (Erbium-Doped Fiber Amplifier)
Analysis & Theory
EDFAs are optical amplifiers used to boost light signals without converting them to electrical.
What does WDM stand for in fiber optic communication?
B
Wavelength Division Multiplexing
Analysis & Theory
WDM allows multiple light signals at different wavelengths to be transmitted on a single fiber.