J730 single-channel compact fiberoptic-to-electrical converter
- Compact logic-level optical signal link receiver
- Allows transport of logic levels and fast triggers over long distances in high EMI environments
- Fast electrical rise times
- Below 12 picoseconds typical RMS link jitter
- J730-1 and J730-11 use commonly-available 62/125 micron multimode ST or FC connectorized fiber at 850 nanometers
- J730-3, J730-5, J730-13, and J730-15 use singlemode or multimode ST or FC connectorized fiber at 1310 or 1550 nanometers
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It has always been difficult to transport fast logic signals long distances over copper conductors. Coaxial or twisted-pair transmission lines introduce attenuation, dispersion, ground loops, and provide an entrance point for external electrical noise. The result can be jitter, pulse width distortion, and ultimately logic errors.
A J720/J730 combination can transport logic level or critical timing triggers over kilometer distances in high EMI environments with link jitter typically below 12 picoseconds RMS. The J730 provides a digital logic output with risetime below 750 picoseconds, and a fast analog (180 MHz bandwidth) output is also provided for monitoring link integrity.
The J730 is compatible with the Highland J720 and J724 E/O Converters, the P400 Digital Delay/Pulse Generator, the company's VME-packaged electrical/optical converter products, and its other VME modules with optical I/O.
| FUNCTION | Single-channel optical-to-electrical converter |
| INPUT | GaAs PIN detector (850 nm versions) InGaAs PIN detector (1310 nm and 1550 nm versions) ST or FC fiberoptic connector 1 mW nominal optical fiber power Optical threshold adjustable from 100 µW to 800 µW, factory set to 300 µW |
| PROPAGATION DELAY | Light in to electrical out: 4 ns, nominal |
| OUTPUTS | Digital: +5 volts, nominal (2.25 V, nominal into 50Ω load) Analog: +1 volt per mW optical input into 50Ω load Source impedance: 50Ω Electrical outputs are gold plated SMB connectors |
| BANDWIDTH | DC to 180 MHz repetition rate |
| RISETIME | Digital output: < 750 ps, 10 to 90% Analog output: < 2.5 ns, 10 to 90% (850 nm versions) < 1.5 ns, 10 to 90% (1310 nm versions) < 1.5 ns, 10 to 90% (1550 nm versions) |
| JITTER | < 12 ps RMS, typical (J720 + J730 combination) |
| OPERATING TEMPERATURE | 0 to 60°C; extended MIL/COTS ranges available |
| CALIBRATION INTERVAL | One year |
| POWER | +12 volts at 60 mA, nominal J12 Universal Wall-Plug Adapter recommended |
| CONNECTORS | ST or FC optical input receptacles Gold plated SMB digital and analog output jacks Front panel test jacks for THR measurement 2.1 mm X 5.5 mm barrel power connector |
| INDICATOR | LED: Green power |
| PACKAGING | 3.3" (L) x 2.1" (W) x 0.9" (H) extruded anodized aluminum enclosure |
J730-1: 850 nm single-channel compact fiberoptic-to-electrical converter with ST connectorization
J730-3: 1310 nm single-channel compact fiberoptic-to-electrical converter with ST connectorization
J730-5: 1550 nm single-channel compact fiberoptic-to-electrical converter with ST connectorization
J730-11: 850 nm single-channel compact fiberoptic-to-electrical converter with FC connectorization
J730-13: 1310 nm single-channel compact fiberoptic-to-electrical converter with FC connectorization
J730-15: 1550 nm single-channel compact fiberoptic-to-electrical converter with FC connectorization