Nokia Exam 4A0-205 Topic 3 Question 51 Discussion

Actual exam question for Nokia's 4A0-205 exam

Question #: 51
Topic #: 3

What is the definition of OSNR?

AThe OSNR is defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber including both signal and optical noise.

BThe OSNR is the ratio between the optical output signal power and the optical input signal power of the device being analyzed.

CThe OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

DThe OSNR is defined as the ratio between the optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.

Show Suggested Answer

Suggested Answer: C

The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth. This is also known as the signal-to-noise ratio (SNR), and it is a measure of how much signal is present in the optical signal compared to the noise, usually expressed in decibels (dB).

by Jolanda at May 04, 2025, 05:07 AM

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Blythe

10 days ago

I'm feeling lucky, so I'm going to go with A. The OSNR is the ratio between the transmitted and received optical power, including both signal and noise.

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Coletta

2 days ago

User 1: I think the definition of OSNR is the ratio between the transmitted and received optical power over 1 km of fiber including both signal and noise.

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Lauran

11 days ago

I agree with Bernardine, option A seems to be the most accurate definition of OSNR.

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Arthur

19 days ago

Haha, this question is a real optical illusion! I'm going to guess D, just to keep things interesting.

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Carmelina

21 days ago

C seems like the way to go. Defining the OSNR as the ratio between the average signal and average noise power is the most logical definition in my opinion.

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Ernie

6 days ago

C) The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

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Antonio

12 days ago

User1: I think C is the correct definition of OSNR.

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Minna

12 days ago

A) The OSNR is defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber including both signal and optical noise.

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Edward

1 months ago

Hmm, I'm not sure about this one. I'm going to go with B, the OSNR is the ratio between the optical output signal power and the optical input signal power of the device being analyzed.

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Chandra

1 days ago

User 1: I think the OSNR is actually defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber including both signal and optical noise.

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Bernardine

1 months ago

But option A makes more sense because it includes both signal and optical noise.

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Fabiola

1 months ago

Option D makes the most sense to me. The OSNR is the ratio between the optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.

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Amber

6 days ago

Yes, option D makes the most sense when defining OSNR.

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Crista

11 days ago

I agree, option D seems to be the most accurate.

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Nenita

12 days ago

I think option D is the correct definition of OSNR.

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Junita

2 months ago

I disagree, I believe it's option D.

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Bernardine

2 months ago

I think the definition of OSNR is option A.

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Callie

2 months ago

I think the correct answer is C. The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

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Kenneth

1 months ago

C) The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

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Cordie

1 months ago

B) The OSNR is the ratio between the optical output signal power and the optical input signal power of the device being analyzed.

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Frank

1 months ago

A) The OSNR is defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber including both signal and optical noise.

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