Noise Figure » History » Version 57

GOMEZ, Ramon, 12/15/2015 12:06 AM

1 47 GOMEZ, Ramon
h1. 3.2 Noise Figure
2 2 HAENNIG, Gerald
3 46 GOMEZ, Ramon
The purpose of this section is to assess the thermal noise degradation induced by the optical link. Related measurement parameter is the Noise Figure (measured with the FSV spectrum Analyzer).
4 2 HAENNIG, Gerald
5 57 GOMEZ, Ramon
The optical link output power is measured with an input termination (done with 50 Ohm termination instead of 75 Ohm as it wasn't available at the laboratory) at a temperature of 290 K.
6 2 HAENNIG, Gerald
7 2 HAENNIG, Gerald
Noise Factor :
8 2 HAENNIG, Gerald
9 57 GOMEZ, Ramon
F = No / (k*To*B*G) 
10 2 HAENNIG, Gerald
11 2 HAENNIG, Gerald
Noise Figure :
12 2 HAENNIG, Gerald
13 57 GOMEZ, Ramon
NF=10*log10(F)
14 2 HAENNIG, Gerald
15 19 HAENNIG, Gerald
The table below contains the Noise Figure measured on the optical link.
16 19 HAENNIG, Gerald
17 53 HAENNIG, Gerald
|_. Parameter |_. Unit |\5=.*Measurements* |
18 35 HAENNIG, Gerald
|_. Frequency |_. MHz |=. 700 |=. 1000 |=. 1500 |=. 2000 |=. 2300 |
19 35 HAENNIG, Gerald
|_. Optical Link Noise Figure |_. dB |=. 30.9 |=. 30.1 |=. 31.3 |=. 32.6 |=. 33.4 |
20 55 HAENNIG, Gerald
|_. Specified Noise Figure |_. dB |=. 31.0 |=. 31.0 |=. 31.0 |=. 31.0 |=. 31.0 |
21 56 HAENNIG, Gerald
22 56 HAENNIG, Gerald
Optical link meets its Noise Figure specification at lower frequencies.
23 56 HAENNIG, Gerald
24 56 HAENNIG, Gerald
For higher frequencies (2000 MHz & 2300 MHz), measured Noise Figure is higher than specifications. More work would be required to check if this could be related to our Noise Figure measurement set-up or an actual limitation from Optical Link.