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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

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How did oxygen (O2) get into Earth's atmosphere??
VladimirAG [237]
Through photosynthesis of plants. Plants take in carbon dioxide (CO2) and produce oxygen (O2)
4 0
3 years ago
Describe scarlar and vector quantites of how they are alike and how they are different
a_sh-v [17]

Answer:

Hello! Here are your answers!

SCALAR: Scalar quantities have a size or magnitude only.

VECTOR: Vector quantities have both magnitudes and direction.

Explanation:

They are alike as they are both used to explain physical quantities and represent the magnitudes or sizes of the physical quantities...

They are different as VECTOR quantities describe an objects DIRECTION as well as magnitude whilst SCALAR doesn't

ie...<u>SCALAR:</u> MASS, TIME

     <u>VECTOR:</u> VELOCITY, ACCELERATION...

I HOPE THIS HELPS!!

4 0
3 years ago
A bird flies overhead from where you stand at an altitude of 270.0ĵ m and at a velocity horizontal to the ground of 14.0î m/is.
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Answer:

L = 8694 Kg.m²/s

Explanation:

r = 270 ĵ m

v = 14 î m/s

m = 2.3 kg

θ = 90º

L = ?

We can apply the equation

L = m*v*r*Sin θ

L = (2.3 kg)*(14 m/s)*(270 m)*Sin 90º = 8694 Kg.m²/s

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4 years ago
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The answer is c. Twelve wants pass an obsessive frequency of the internet
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4 years ago
A spring on a horizontal surface can be stretched and held 0.2 m from its equilibrium position with a force of 16 N. a. How much
nekit [7.7K]

Answer:

a   W_{3.5} = 490 \  J

b  W_{2.5} =  250 \  J

Explanation:

Generally the force constant is mathematically represented as

       k  = \frac{F}{x}

substituting values given in the question

=>   k  = \frac{16}{0.2}

=>   k  =  80 \ N /m

Generally the workdone  in stretching the spring 3.5 m is mathematically represented as

       W_{3.5} =  \frac{1}{2}  *  k  *  (3.5)^2

=>     W_{3.5} =  \frac{1}{2}  *  80  *  (3.5)^2

=>    W_{3.5} = 490 \  J

Generally the workdone  in compressing the spring 2.5 m is mathematically represented as

        W_{2.5} =  \frac{1}{2}  *  k  *  (2.5)^2

=>      W_{2.5} =  \frac{1}{2}  *  80 *  (2.5)^2

=>       W_{2.5} =  250 \  J

5 0
3 years ago
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