Optical Sources - Electronic Engineering (MCQ) questions & answers

1)   In the dynamic response of Injection Laser Diode (ILD), the delay which is followed by ____ frequency damped oscillations give rise to the generation of relaxation oscillations.

a. Low
b. Medium
c. High
d. All of the above
Answer  Explanation 

ANSWER: High

Explanation:
No explanation is available for this question!
2)   Which type of injection laser involves the use of geometry for fabrication of the multimode injection laser with a single or small number of lateral modes?

a. Gain guided laser
b. Index guided laser
c. Quantum well laser
d. Quantum dot laser
Answer  Explanation 

ANSWER: Gain guided laser

Explanation:
No explanation is available for this question!
3)   Which modes are acknowledged due to their association with electromagnetic field and beam profile in the direction perpendicular to the plane of pn junction?

a. Longitudinal Modes
b. Transverse Modes
c. Lateral Modes
d. All of the above
Answer  Explanation 

ANSWER: Transverse Modes

Explanation:
No explanation is available for this question!
4)   Which among the following characteristics of Laser light specifies the precise movement of all individual light waves together through time and space?

a. Monochromatic
b. Directional
c. Coherent
d. Brightness
Answer  Explanation 

ANSWER: Coherent

Explanation:
No explanation is available for this question!
5)   In a laser structure, the existence of standing waves is possible at frequencies for which the distance between the mirrors is an integral number of ________

a. λ / 2
b. λ / 4
c. λ / 6
d. λ / 8
Answer  Explanation 

ANSWER: λ / 2

Explanation:
No explanation is available for this question!
6)   Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. What will be the value of number of longitudinal modes?

a. 3.9 x 105
b. 4.9 x 105
c. 5.6 x 105
d. 7.7 x 105
Answer  Explanation 

ANSWER: 3.9 x 105

Explanation:
No explanation is available for this question!
7)   In Stimulated Emission, which among the following parameters of generated photon is/are similar to the photon of incident wave?

a. Phase
b. Frequency
c. Polarization & direction of travel
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!
8)   Which among the following is a key process adopted for the laser beam formation as it undergoes the light amplification?

a. Spontaneous Emission
b. Stimulated Emission
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Stimulated Emission

Explanation:
No explanation is available for this question!
9)   In spontaneous emission, the light source in an excited state undergoes the transition to a state with _______  

a. Higher energy
b. Moderate energy
c. Lower energy
d. All of the above
Answer  Explanation 

ANSWER: Lower energy

Explanation:
No explanation is available for this question!
10)   In the fiber optic link, power transfer from one fiber to another and from fiber to detector must take place with _________coupling efficiency.

a. maximum
b. stable
c. minimum
d. unpredictable
Answer  Explanation 

ANSWER: maximum

Explanation:
No explanation is available for this question!

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