SOURCEFORGE » RALF » 2015 Evaluation and test of an optical / L-band tranceiver

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h1. 2.3 Main Parameters

This part lists the main specifications and highlights the main parameters to compare an optical link with a coaxial cable

h2. 2.3.1 Optical link

The optical link consists of :
* Optical transmitter OTX1910 from the manufacturer lynx-technik : it modulates the intensity of the optical 1320 nm wavelength with the RF input signal ;
* Monomode fiber 9/125 OS2 (to avoid dispersion effect) to optical signal on a distance up to 10 kilometers ;
* Optical Receiver ORX1900 from the manufacturer lynx-technik : it detects optical wavelength intensity modulation and outputs the RF modulating signal.

*Optical transmitter OTX1910*

|_. Optical transmitter OTX1910 |_. min |_. typ |_. max |_. Unit |_. comments |
|Supply |=. 9 |=. 12 |=. 14 |=. V |=. |
|Current consumption |=. - |=. - |=. 450 |=. mA |=. |
|RF Input Connector |\3=. 75 Ohm F-type |=. |=. |
|RF Return Loss |=. 14 |=. - |=. - |=. dB |=. |
|RF Maximum Input Level |=. - |=. - |=. 15 |=. dBm |=. |
|RF Input Dynamic Range |=. -65 |=. - |=. -10 |=. dBm |=. |
|RF Input Frequency |=. 700 |=. - |=. 2300 |=. MHz |=. |
|Optical Connecctor |\3=. LC/PC single mode |=. |=. |
|Optical signal wavelength |=. - |=. 1310 |=. - |=. nm |=. |
|Optical power level |=. - |=. 1 |=. - |=. dBm |=. |

*Fiber Monomode 9/125 OS2 (G.652.D ITU-T compliant), low dispersion at 1320 nm*

|_. Fiber Optic |_. min |_. typ |_. max |_. Unit |_. comments |
| Optical Loss |=. - |=. 0.3 |=. - |=. dB/km |=. 1320 nm |

*Optical receiver ORX1900*

|_. Optical receiver ORX1900 |_. min |_. typ |_. max |_. Unit |_. comments |
|Supply |=. 9 |=. 12 |=. 14 |=. V |=. |
|Current consumption |=. - |=. 240 |=. - |=. mA |=. |
|Optical Input Connector |\3=. LC/PC single mode |=. |=. |
|Optical input signal wavelength range |=. 1270 |=. 1310 |=. 1610 |=. nm |=. |
|Optical input signal level range |=. -6 |=. - |=. 4 |=. dBm |=. |
|RF Output Connector |\3=. 75 Ohm F-type |=. |=. |
|RF Input Frequency |=. 700 |=. - |=. 2300 |=. MHz |=. |

*Overall Optical link with fiber length of 1 m*

Lynx-technik technical provided us more technical specifications about the optical link.

However, they do

sorry, we don't have any values for phase noise measurements.

noise.
And unfortunately we also don't have the tools to measure it in our lab.

|_. Optical link with fiber length of 1 m |_. min |_. typ |_. max |_. Unit |_. comments |
|Noise Figure |=. - |=. - |=. 31 |=. dB |=. |
|Carrier to Noise Ratio |=. 55 |=. - |=. - |=. dB |=. Pin=-13 dBm, Fiber=1 m |
|SFDR |=. 102 |=. - |=. - |=. dB/Hz2/3 |=. Pin=-13 dBm, IM3=50 dBc|
|IIP3 |=. 12 | - |=. - |=. dBm |=. Pin=-13 dBm, IM3=50 dBc|

h2. 2.3.2 Coaxial cable

*The optical link is a replacement of a coaxial cable EN50117-6 11PATC/PH 1.7/6.9 Class A 3GHz (B93) 17/13 139m.*

|_. COAXIAL CABLE |_. min |_. typ |_. max |_. Unit |_. comments |
|/12. RF Loss @ 20°C |=. - |=. 0.9 |=. - |/12. dB/100m |=. 5 MHz |
| - |=. 2.7 |=. - |=. 50 MHz |
| - |=. 3.8 |=. - |=. 100 MHz |
| - |=. 5.4 |=. - |=. 200 MHz |
| - |=. 7.7 |=. - |=.400 MHz |
| - |=. 11 |=.- |=. 800 MHz |
| - |=. 11.5 |=. - |=. 862 MHz |
| - |=. 12.1 |=. - |=. 950 MHz |
| - |=. 14.6 |=. - |=. 1350 MHz |
| - |=. 16.7 |=. - |=. 1750 MHz |
| - |=. 18.7 |=. - |=. 2150 MHz |
| - |=. 22.3 |=. - |=. 3000 MHz |
| IIP3 |=. 50 |=. - |=. - |=. dBm |=. Estimation |

IIP3 is only an estimation to be compared with optical link : this value is deemed quite conservative due to the fact the cable is a passive component.

h2. 2.4 References

lynx-technik