The QuestTel's 1310nm - 8mW direct modulated optical transmitter is the most important equipment to construct the CATV HFC network. It mainly used for the long distance optical fiber transmission of TV image signal, digital television signal, telephone voice signal and data (or compressed data) signal's. It converts any incoming RF signal within this band to optical RF and transports all channels and programs over one fiber. This product does use the high-performance DFB laser as the optical source with Automatic Gain Control. The RF drive part adopts RF power digital automatic processing technology and advanced RF pre-distortion circuit, and built-in microcomputer automatic monitoring system, to ensure the excellent performance indicators.
| RF Optical Transmitter | |
| Optical output power | 8mW |
| Optical Wavelength | 1310nm |
| Flatness Range | 45-750/862/1003 MHz |
| Equivalent Noise Intensity | < -160 dB/Hz |
| Extinction Ratio | >20 dB XP |
| Line Width: | < 1 MHz FWHM |
| Return Loss | >55 dB |
| Optical modulation mode | Direct optical intensity modulation |
| Optical connector type | SC/APC |
| RF Parameters | |
| RF Power Level | 11-29 dBmV AGC Managed |
| Flatness | <± 0.75 45 - 862 MHz |
| CNR | ≥ 51 dB @ 10km fiber |
| SBC Restrain | >17 dBm |
| C/CTB | ≥ 65 dB |
| C/CSO | ≥ 60 dB |
| Dimensions | 483 (L)×380 (W) ×44 (H) mm |
| Power supply voltage | AC 110V-250V (50Hz) |
| Consumption | 30 W |
| Operating temperature | 0°C ~ 45°C |
| Storage temperature | -20°C ~ +65°C |
| Relative humidity | Max 95% no condensation |
| Weight | 2.6 kg |
How RF over Fiber Links Work
Converting RF signals into light, then transporting the optical signal over fiber optic cable, is a complex process which requires a high degree of technical expertise. Incoming RF signals from the antenna or signal source are fed into QuestTel's RF over Fiber Transmitter Module via the 75 Ohm RF connector. The Module contains RF signal conditioning and provides complex impedance matching between 75 Ohm input impedance and the Laser, Laser Control, APC, Monitoring and Alarm electronics. The Transmitter Module utilizes an Intensity Modulation scheme to convert RF signals into light. This modulated light is then transported through an optical fiber to the QuestTel's RF over Fiber Optical Receiver Module. The Receiver Module converts the modulated light back into an RF signal. The recovered RF signal is again complex impedance matched and amplified before it becomes available at the output of the Receiver Module.
Disclaimer: Products, specifications and data are subject to change without notice, to improve reliability, function, design or otherwise.
