Description
The Force, Incorporated Model 2804 VSB/AM Fiber Optic Video Link of the CATVLinx family provides a robust system for transferring up to 110 channels of VSB/AM modulated signals over a single-mode optical fiber. The system is also suitable for transferring 80 CATV channels along with 30 digital QAM channels in the upper frequency range. Up to 110 analog channels may be transported with slightly reduced performance. The system provides 860 MHz of usable bandwidth for video signals stacked at 6 MHz intervals. A low loss single-mode optical fiber (e.g. 0.5 dB/km) will allow full channel loading to beyond 20 km while maintaining a good carrier-to-noise ratio (CNR).
The transmitter uses a high-power, low noise 1310 nm distributed feedback (DFB) laser diode. An optical isolator protects the laser from optical reflections in the transmission path. This ensures high carrier-to-noise, consistent performance in all installation scenarios, and excellent linearity. Each input carrier to the transmitter should have a level of approximately +22 dBmV. Exceeding the RF input level may destroy the transmitter. See application note, AN128, “Care and Feeding of Analog CATV Fiber Optic Links,” for information on setting the proper RF input level. The transmitter is normally configured for EIA 19″ wide rack mounting with a height of 1.75″ (1RU) or can be utilized as a tabletop unit. The chassis can be powered to operate from 85-264 VAC.