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Nokia 4A0-205 Exam - Topic 6 Question 60 Discussion

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

Nokia 4A0-205 Exam - Topic 6 Question 60 Discussion

Actual exam question for Nokia's 4A0-205 exam
Question #: 60
Topic #: 6
[All 4A0-205 Questions]

What is the definition of OSNR?

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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 Yolande at Jan 05, 2026, 05:16 AM

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Audry
1 month ago
A seems too specific. I like the broader view in C.
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Jessenia
1 month ago
I prefer D. It includes noise, which is crucial.
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Kirby
2 months ago
Option C makes sense to me. Average power is key.
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Reita
2 months ago
I think OSNR is about signal quality.
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Winfred
2 months ago
Nah, D is the most accurate one here!
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Jodi
2 months ago
I thought it included distance too, like in A?
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Terry
2 months ago
Wait, isn’t it more complicated than just a ratio?
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Linn
2 months ago
Definitely option C, that’s the standard definition.
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Kirk
3 months ago
OSNR is all about signal vs. noise power!
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Kimi
3 months ago
I'm going with C, it just makes the most sense to me.
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Desirae
3 months ago
Hmm, I thought OSNR stood for "Optical Silly Noise Ratio"?
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Beula
4 months ago
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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Beckie
4 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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Barb
4 months ago
I thought OSNR was about the ratio of signal to noise, but I’m confused about the specifics of bandwidth in the definitions.
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Melda
4 months ago
I feel like option D sounds right because it mentions the optical signal power including noise, but I can't recall the exact details.
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Ulysses
4 months ago
I remember practicing a question similar to this, and I think it had to do with the average power of the signal and noise.
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Elin
4 months ago
I think OSNR stands for Optical Signal-to-Noise Ratio, but I'm not sure which option correctly defines it.
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Lashandra
5 months ago
Wait, I think the key here is the "specific spectral bandwidth" part. The OSNR is the ratio of the average optical signal power to the average optical noise power over a certain bandwidth. That means option C is the correct definition.
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Iluminada
5 months ago
I've got this! The OSNR is the ratio of the output signal power to the input signal power of a device, so I'm going to go with option B.
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Shawn
5 months ago
Okay, I remember learning about OSNR in class. I'm pretty sure it's the ratio of the transmitted optical power to the received optical power, including both signal and noise, over a specific distance. So I'll select option A.
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Ettie
5 months ago
Hmm, I'm a bit confused on this one. I know OSNR has something to do with the signal-to-noise ratio, but I'm not sure which of these options is the exact definition. I'll have to think it through carefully.
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Paris
5 months ago
I think the definition of OSNR is the ratio between the optical signal power and the optical noise power over a specific bandwidth, so I'll go with option D.
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Tawanna
24 days ago
Yeah, it really captures the essence of OSNR.
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Veronique
30 days ago
I agree with you, option D makes the most sense.
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