1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lana71 [14]
4 years ago
13

Why are noise considerations important in optical fiber communications? 3. Describe the principle of "population inversion".

Physics
1 answer:
pochemuha4 years ago
7 0

Answer and Explanation:

the electronic devices always have some noises present in the signal

there are some important considerations in optical fiber communications these are.

  • the noise which is contributed by transmitter are electronic random noise, low frequency noise
  • noise which is contributed by laser are relative intensity noise, mode partition noise, conversion of phase noise to amplitude noise.
  • noise contributed by photo detector are quantum shot noise, shot noise from dark current, avalanche multiplication noise.

PRINCIPLE OF POPULATION INVERSION :

The principle of population inversion is defined as for production of high percentage of simulated emission for a laser beam the number of atoms in higher state should be greater than lower energy state

You might be interested in
Most earthquakes occur along or near the edges of the earth's
Pepsi [2]
Most earthquakes occur along or near the edges of the earth's lithospheric<span> plate. </span>
8 0
3 years ago
Relay of thermostate is not working why
Colt1911 [192]

Check the power source. Your thermostat may just not be connected right or at all. A blown fuse, tripped circuit breaker or dead batteries will prevent the thermostat from turning on your furnace.

Dirty thermostat? That’ll cause issues. Clean up any dust, dirt, spider webs and other debris. Any of these things can coat the inside of the thermostat and interfere with both electrical and mechanical functions of the thermostat. Put this on your get-ready-for-winter cleaning list. Just use a soft, clean brush to clean the inside components gently. Don’t get anything wet. Also you can use a can of compressed air, such as is used for electronics, to clear debris.

Check for any loose wires or terminal screws inside the thermostat. Make sure wires aren’t corroded or detached. Never remove the thermostat cover without removing the batteries or turning off the power at the fuse or breaker box. Tighten screws and secure loose wires if needed.

It may be time to replace your thermostat is it’s old. They aren’t meant to last forever and an old thermostat may be costing you a lot of money in wasted energy and time spent tinkering with an outdated model. There are great programmable thermostats available now that are easy to use and simple to connect to your existing HVAC system. Click here for more info on programmable thermostats.

7 0
3 years ago
Which two statements describe how ultrasound technology produces an image of a baby before it is born?
Elan Coil [88]

Answer:a and c

Explanation:

8 0
3 years ago
Read 2 more answers
Wat is the meaning of inference?
VladimirAG [237]

The meaning of inference is the process of inferring  something and it is a noun


5 0
4 years ago
Read 2 more answers
A box is being pulled to the right. What is the direction of the gravitational force?
lapo4ka [179]

The correct answer to the question is vertically downward i.e towards the centre of earth.

EXPLANATION:

As per the question, the box is pulled to the right.

Hence, the direction of the applied force is towards right.

We are asked to determine the direction of the gravitational force that acts on the body.

Before answering this question, first we gave to understand the gravitational force of earth.

Any body present on the surface of earth is attracted with the force of gravity of earth ( gravitational force ) towards its centre.  It is equivalent to the weight of the body.  

The force of gravity is always directed towards the centre of earth irrespective of the nature of applied force.

Hence, the direction of the gravitational force which acts on the box is vertically downward.


7 0
3 years ago
Read 2 more answers
Other questions:
  • I need help with 23 please.
    12·1 answer
  • A student is given an assignment to demonstrate diffraction. He takes a photograph of a straw in a glass of water. The straw app
    15·2 answers
  • What safety measures can be added to a circuit and how do they work ?
    15·1 answer
  • Consider a large truck and a small car driving up a straight steep hill. The truck is moving at 60 miles per hour and the car at
    8·1 answer
  • An egg drops from a nest at a height of 2.3 m. Which equation can you use to calculate the impact speed of the egg?
    10·1 answer
  • Which type of path do planets follow around the sun?
    5·2 answers
  • Propane burns in oxygen to produce carbon dioxide and water. What are the chemical formulas of the reactants and products? The f
    6·2 answers
  • Based on Newton's 3rd law, the force pairs always act on what?
    13·2 answers
  • Which of the following has zeros that are not significant?
    10·1 answer
  • You want to average 90 km/h on a car trip. You cover the first half of the distance at an
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!