Nokia Exam 4A0-205 Topic 3 Question 47 Discussion

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

Question #: 47
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 Leota at Feb 06, 2025, 01:19 AM

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Eladia

2 months ago

Haha, the OSNR... sounds like something you'd need a microscope to measure! I'll go with C, just to be on the safe side.

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Kasandra

24 days ago

I'm going with A, it seems like the most accurate definition.

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Lai

1 months ago

I think it's D, actually.

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Aron

2 months ago

Hmm, I'm not sure about this one. I was going to go with D, but now I'm second-guessing myself. Does anyone have a good way to remember the difference between these options?

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Leigha

26 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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Anthony

28 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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Vallie

2 months ago

Hmm, that makes sense. I see your point now.

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Gertude

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. This makes the most sense to me.

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Kristel

29 days ago

I think B might be the correct answer. 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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Katie

1 months ago

I agree with you, C seems to be the most accurate definition of OSNR.

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Jennie

2 months ago

I believe the answer is D. The OSNR is defined as the ratio between the optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.

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Jutta

2 months ago

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Denny

2 months ago

I disagree, I believe it's option D because it includes noise in the ratio.

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Vallie

2 months ago

I think the definition of OSNR is option A.

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