What is/are the advantage(s) of step-index monomode fibre optical cable?
A. 1 only
B. 2 only
C. 3 only
D. 1, 2 and 3
Select an option to see the answer and solution.
In an optical fiber, the light beam propagates due to which one of the following?
A. Simple reflection of light at a boundary between two media
B. Refraction of light in the medium
C. Total internal reflection at the boundary of the fiber
D. Scattering of light in the medium
Select an option to see the answer and solution.
Which band specifies the operation range of Erbium doped fiber amplifier (EDFA)?
A. by O band
B. By C band
C. By S band
D. By Ku band
Select an option to see the answer and solution.
In optical communication, wavelength 1550 nm is used now a days. What is/are the possible reason(s)?
A. 1, 2 and 3
B. 2 only
C. 1 only
D. 1 and 3 only
Select an option to see the answer and solution.
Attenuation of a narrow monochromatic X-ray beam in a metal plate of thickness d is given by:
A. I = I 0 e − μ d
B. I = I 0 e − μ d 2
C. I = i 0 e − d μ
D. I = i 0 e − d 2 μ 2
Select an option to see the answer and solution.
Which one of the following instruction is useful while measuring the optical power as a function of wavelength?
A. Optical power attenuator
B. Optical power analyzer
C. Optical spectrum analyzer
D. Optical return loss tester
Select an option to see the answer and solution.
A change in the refractive index of a material in response to an applied electric field is called . . . . . . . . effect.
A. Pockets
B. Faraday
C. Kerr
D. Raman
E. Voigt
Select an option to see the answer and solution.
In increasing order of spectral width of three optical sources are
A. Gas laser, semiconductor laser, LED
B. Semiconductor laser, gas laser, LED
C. LED, gas laser, semiconductor laser
D. LED, semiconductor laser, gas laser
Select an option to see the answer and solution.
What is the numerical aperture of an optical fiber when its critical angle is 30°
Select an option to see the answer and solution.
In a step index fibre the refractive index of core n1 = 1.48 and that of cladding n2 = 1.45. The numerical aperture of the fiber will be nearly:
Select an option to see the answer and solution.
In an opto-electronic communication system, the system component in which free electrons are involved in its operation is
A. Laser
B. Optical fibre
C. Photo detector
D. Coupling device employed with the optical fibre
Select an option to see the answer and solution.
Match
List-I wish
List-II and select the correct answer the correct answer using the options given below:
List-I (System)List-II (Order of wavelength)
a. Optical fiber communication
1. 104 m
b. Local television system
2. 102 m
c. FM broadcasting
3. 10° m
d. Satellite
4. 10-2 m
5. 10-6 m
A. a-5, b-3, c-3, d-4
B. a-1, b-3, c-4, d-5
C. a-2, b-2, c-3, d-5
D. a-1, b-2, c-5, d-4
Select an option to see the answer and solution.
In the SONET, form the Synchronous Transport Signal (STS), Optional Carrier (OC) is obtained
A. after scrambling and optical electrical conversion
B. after electrical to optical conversion
C. after optical to electrical conversion
D. after scrambling and electrical to optical conversion
Select an option to see the answer and solution.
A fibre-optic cable has the indices of refraction of core of 1.6 and of cladding of 1.4, For an angle of incidence 70°, the angle of return light ray will be
Select an option to see the answer and solution.
What type of wiring does ISDN use?
A. Coaxial cable
B. Twisted pair
C. Solenoid
D. Thin wire
Select an option to see the answer and solution.
A single-mode optical fiber has a beat length of 8 cm at 1300 nm. The value of birefringence Bf will be nearly
A. 1.6 × 10-5
B. 2.7 × 10-5
C. 3.2 × 10-5
D. 4.9 × 10-5
Select an option to see the answer and solution.
The local loop is
A. An antenna used for telephone communications
B. The connection between telephone subscriber and central office
C. A cell site
D. A ring network used to connect users to the telephone office
Select an option to see the answer and solution.
Assuming no ISI, the maximum possible bandwidth of a multimode graded index fiber with 5 MHz, shows the total pulse broadening of 0.1s for the distance of about 12 km. What would be the value of bandwidth length product?
A. 40 MHz
B. 60 MHz
C. 90 MHz
D. 120 MHz
Select an option to see the answer and solution.
An optical fibre has refractive index core
A. high and low refractive index cladding
B. low and high refractive index cladding
C. uniform surrounded by variable index cladding
D. variable with refractive index increases from low at the centre to high at the junction with cladding
Select an option to see the answer and solution.
The response time of photodiode depends on
A. Diffusion time of photo carriers outside the depletion region
B. Diffusion time of photo carriers within the depletion region
C. RC time constant
D. All of the above
Select an option to see the answer and solution.
