Question:
In a fibre optic system the source and detector respectively are
In a fibre optic system the source and detector respectively are
Show Hint
Fibre optics: Laser/LED → fibre → photodiode.
Updated On: Jul 2, 2026
- PN junction laser and a photo diode
- PN junction laser and an LED
- LED and a BJT
- LED and a MOSFET
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
A fibre optic communication system consists of a light source, transmission medium, and detector.
Step 1: Source requirement The source must generate optical signals (light).
Step 2: Common sources LEDs and laser diodes (PN junction lasers) are used.
Step 3: Detector requirement The detector must convert light into electrical signal.
Step 4: Common detectors Photodiodes are widely used due to high sensitivity and speed.
Step 5: Conclusion \[ \boxed{\text{PN junction laser and photodiode}} \]
Final Answer: \[ \boxed{(A)} \]
Step 1: Source requirement The source must generate optical signals (light).
Step 2: Common sources LEDs and laser diodes (PN junction lasers) are used.
Step 3: Detector requirement The detector must convert light into electrical signal.
Step 4: Common detectors Photodiodes are widely used due to high sensitivity and speed.
Step 5: Conclusion \[ \boxed{\text{PN junction laser and photodiode}} \]
Final Answer: \[ \boxed{(A)} \]
Was this answer helpful?
0
0
Top AP ECET ECE Electronics and Communication Engineering Questions
- A conductor acquires excess electrons has individual voltage gain of \(25 \times 10^4\). Its overall gain in dB is
- The temperature coefficient of a metal is ___ and that of a semiconductor is ___ respectively
- For a transistor if \(\alpha = 0.98\) and emitter current is \(2.8\,mA\), then the collector current is
- The gain of an amplifier with positive feedback is given by the relation
- The junction capacitance of a PN junction depends on
View More Questions
Top AP ECET ECE Photodetectors Questions
- The phenomenon of injection electro luminescence is the basis of working of
- Consider the following statements in respect to a solar cell (i) a solar cell is a large area p-n junction (ii) in a solar cell the p-n junction is near the surface (iii) a solar cell is a photovoltaic device Which of the statements given above are correct?
Top AP ECET ECE Questions
- Order of the matrix $\begin{bmatrix} 1 & 6 \\ 2 & 0 \\ 7 & -1 \end{bmatrix}$ is
- If two rows (or columns) of a determinant of order 3 are identical then the value of determinant is
- Co-factor of -4 in $\begin{vmatrix} 1 & 2 & 3 \\ -4 & 3 & 6 \\ 2 & -7 & 9 \end{vmatrix}$ is
- The Matrix $\begin{bmatrix} a & h & g \\ h & b & f \\ g & f & c \end{bmatrix}$ is
- If $A = \begin{bmatrix} 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 0 \end{bmatrix}$ then $(A^{-1}) =$
View More Questions