- Table of contents
- 2.3 Main Parameters
2.3 Main Parameters¶
This part lists the main specifications and highlights the main parameters to compare an optical link with a coaxial cable.
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 kilometres.
- Optical Receiver ORX1900 from the manufacturer lynx-technik : it detects optical wavelength intensity modulation and outputs the RF modulating signal.
2.3.1.1 OTX1910 Optical Transmitter¶
Figure 1. OTX1910 Optical Transmitter (source : lynx-technik website)
| Optical transmitter OTX1910 | min | typ | max | Unit | comments |
|---|---|---|---|---|---|
| Supply | 9 | 12 | 14 | V | |
| Current consumption | - | - | 450 | mA | |
| RF Input Connector | 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 | LC/PC single mode | ||||
| Optical signal wavelength | - | 1310 | - | nm | |
| Optical power level | - | 1 | - | dBm | |
2.3.1.2 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 |
2.3.1.3 ORX1900 Optical Receiver¶
Figure 2. ORX1900 Optical Receiver (source : lynx-technik website)
| Optical receiver ORX1900 | min | typ | max | Unit | comments |
|---|---|---|---|---|---|
| Supply | 9 | 12 | 14 | V | |
| Current consumption | - | 240 | - | mA | |
| Optical Input Connector | LC/PC single mode | ||||
| Optical input signal wavelength range | 1270 | 1310 | 1610 | nm | |
| Optical input signal level range | -6 | - | 4 | dBm | |
| RF Output Connector | 75 Ohm F-type | ||||
| RF Input Frequency | 700 | - | 2300 | MHz | |
2.3.1.4 Overall Optical link with fiber length of 1 m¶
Lynx-technik technical provided us more technical specifications about the optical link. However, they did not have any phase noise measurements.
| 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 |
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 |
|---|---|---|---|---|---|
| RF Loss @ 20°C | - | 0.9 | - | 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.
2.4 References¶
[1] lynx-technik web site : http://www.lynx-technik.com/en/home/
[2] Latest OTX1910 transmitter datasheet : http://media.lynx-technik.de/uploads/tx_lynx/product/pdf/OTX1910-rev3.pdf
[3] Latest ORX1900 receiver datasheet : http://media.lynx-technik.de/uploads/tx_lynx/product/pdf/ORX1900-rev3.pdf