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 : 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 : 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 |=. |

*Optical link with fiber length of 1 m*

|_. 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 - dB/ 100m 200 MHz |
| - 7,7 - dB/ 100m 400 MHz |
- 11 - dB/ 100m 800 MHz |
- 11,5 - dB/ 100m 862 MHz |
- 12,1 - dB/ 100m 950 MHz |
- 14,6 - dB/ 100m 1350 MHz |
- 16,7 - dB/ 100m 1750 MHz |
- 18,7 - dB/ 100m 2150 MHz |
- 22,3 - dB/ 100m 3000 MHz |