Point2point fibre optic links
point2point links are fixed gain, analogue signal transmission systems – solving electrical interference and signal attenuation problems in signal monitoring and distribution. Depending on the frequency range, point2point links use either intensity modulation or 14-bit digital modulation to convert analogue signals for transmission over fibre.
- High-performance analogue system
- Solves the problem of electrical interference
- High voltage isolation
Frequency ranges:
G series – 40 Hz to 250 MHz
K series – 2 kHz to 1.35 GHz
P series – 1 MHz to 2 GHz
S series – 10 MHz to 3 GHz
R series – DC to 2.5 MHz
T series – DC to 20 MHz
U series – DC to 40 MHz
| Key Features |
| – Wide, flat frequency response – Electrically shielded modules – All modulation formats – Wide dynamic range – Flat bandpass response – Single-mode or multimode – Up to 36 hours of battery life |
| Key Benefits |
| – Immunity to electrical interference – Very long path lengths – Negligible degradation of signal-to-noise – A safe transmission path for monitoring at hazardous voltages – Immunity to electromagnetic fields – Elimination of ground loops |
Key Standards
point2point supports standards testing for EMC, EMP, HIRF, NEMP etc., including key standards such as:
- MIL-STD-188-125
- MIL-STD-461G
- DEF STAN 59-188
- DEF STAN 59-411.
Specifications for AC coupled links
| AC Coupled Links | G series | K series | P series | S series |
|---|---|---|---|---|
| Passband | 40 Hz to 250 MHz | 2 kHz to 1.35 GHz | 1 MHz to 2 GHz | 10 MHz to 3 GHz |
| Gain Flatness (typical) | ±0.5 dB (100 Hz-250 MHz) | ±0.5 dB (10 kHz-1.35 GHz) | ±0.5 dB | ±0.75 dB |
| Gain Flatness (max.) | ±3 dB | ±3 dB | ±1.5 dB | ±1.5 dB |
| Phase Flatness | > 100 Hz : ±20 ° | > 5 kHz : ±20 ° | ±20 ° (typ.±5 ° for 1 MHz to 1.5 GHz) | ±20 ° (typ. ±5 ° for 1 MHz to 1.5 GHz) |
| Rise Time | <1.4 nS | <350 pS | <250 pS | <200 pS |
| Noise Figure (typical) | < 24 dB (22 dB) @ 100 MHz | < 25 dB (22 dB) @ 500 MHz | <25 dB (24 dB) @ 500 MHz, < 30 dB @ 2 GHz | < 26 dB (24 dB) @ 500 MHz, < 30 dB @ 3 GHz |
| Signal Latency (1 m Fibre) | 10 nS | |||
| Transmitter Input Impedence (VSWR) | 50 W (<1.5:1) | |||
| Reciever Output Impedence (VSWR) | 50 W (<1.5:1) | |||
| Input P1 db | >0 dBm @ 100 MHz | >0 dBm @ 500 MHz | >0 dBm @ 500 MHz | >0 dBm @ 500 MHz |
| Input IP3 | >10 dBm@ 100 MHz | >10 dBm @ 500 MHz | >10 dBm @ 500 MHz | >10 dBm @ 500 MHz |
| Signal Inversion | Inverting | |||
| Operating Temperature | -10 to +40 °C | |||
| Optical Path Length | <1 m to ~4 km | |||
| Optical Budget | -3 dB will turn status LED red/green on RX module, -10 dB will turn status LED red on RX module | |||
| Electrical Connectors | SMA Female 50 W | |||
| Optical Connectors | Singlemode: FC/APC Narrow Key | |||
| Current Consumption @ 12 V | <250 mA for Transmitter Module, <150 mA for Receiver Module | |||
| Front Panel Indication: Transmitter Module | Power supply status & transmitter active | |||
| Front Panel Indication: Receiver Module | Power supply status & received light level |
Specifications – DC coupled links
| DC Coupled Links | R series | T series | U series |
|---|---|---|---|
| Pass band | 0 Hz-2.5 MHz | 0 Hz-20 MHz | 0 Hz-40 MHz |
| Gain Flatness | +/-0.5 dB to 1 MHz | +/-0.25 dB to 2 MHz | +/-0.25 dB to 10 MHz |
| +/-1 dB to 2 MHz | +/-1 dB to 15 MHz | +/-1 dB to 30 MHz | |
| +/-3 dB to 2.5 MHz | +/-3 dB to 20 MHz | +/-3 dB to 40 MHz | |
| Phase flatness | <±10 ° | ||
| Rise time | <135 ns | <20.5 ns | <10.3 ns |
| Output Noise… (Full Band, all values are Vrms) | |||
| …For +/-2V output | 0.3 mV (0.02 % FS) | 0.8 mV (0.06 % FS) | 0.7 mV (0.05 % FS) |
| …For +/-10V output | 1.5 mV (0.02 % FS) | N/A | N/A |
| Signal latency (1M fibre) | 350 ns | 280 ns | 210 ns |
| Transmitter input impedance | 1 MΩ / 25 pF typ. | ||
| Receiver output impedance | 50 Ω @ ±2 V standard | ||
| 300 Ω @ ±10 V optional (2.5 MHz limited) | |||
| Output DC offset (worst case over whole output range) | <0.3 % of FSD | <0.3 % of FSD | <0.3 % of FSD |
| Non-linearity | 0.1 % of FSD | 0.1 % of FSD | 0.06 % of FSD |
| Operating temperature | -20 to +60 °C | ||
| Optical path length (singlemode) | <1 m to 10 km | ||
| Electrical Connectors | BNC 50 Ω | ||
| Optical Connectors | Singlemode: FC/APC | ||
| Current Consumption @ 12V: TX | <240 mA | <240mA | <210mA |
| Current Consumption @ 12V: RX | <350 mA | <315mA | <280mA |
| Front Panel Indication: Transmitter Module | Power supply status & ADC overflow | ||
| Front Panel Indication: Receiver Module | Power supply status & Link Lock status |