1550nm externally modulated optical transmitter is the core equipment in this system. RFTV is a unidirectional analogue and digital video broadcast. It adopts high efficiency modulation mode for RF carrier wave and its economy, flexibility and bandwidth validity is beyond comparison of IPTV. Adopting EPON or P2P access mode to realize triple-play, FTTx , RFTV broadcasting network in 1550nm optical transmitter wavelength still plays an important role.
| Parameter | Index | Remarks | |
| Optical Parameters | Wavelength （nm） | 1550±10 | |
| Output power （dBm） | 1×3 ~ 2×10 | 2x7 | |
| 2 port with power of 7 dbm each | |||
| Optical return loss （dB） | ≥60 | ||
| Connector type | SC/APC Or FC/APC | SC/APC | |
| RF parameters | bandwidth （MHz） | 47~862/1000 | 47~1000 |
| Input level （dBmV） | 23±5 | AGC | |
| Flatness （dB） | ≤±0.75 | 45~862MHz | |
| Return loss （dB） | ≥16 | 45~750MHz | |
| Input inpedance （Ω） | 75 | ||
| Link Parameters | channels | PAL-D/60ch | |
| CNR （dB） | ≥53 | 65Km fiber，Receive0dBm | |
| CTB （dB） | ≥65 | ||
| CSO （dB） | ≥65 | ||
| SBS （dBm） | 13~19 | Step 0.1 | |
| General Parameters | Net interface | RJ45，R232 | |
| Power （V） | 90~265 | Or -48VDC | |
| Power loss （W） | ≤50 | ||
| Working Temp（℃） | 0~50 | Automatically shell temp control | |
| Storage Temp（℃） | -20~85 | ||
| Working relative Temp | 20%~85% | ||
Both the external modulator and laser are imported from the United States or Japan.
Perfect pre-distortion circuit ensures the best CTB and CSO when the CNR is in high standard.
Perfect SBS suppress circuit and adjustable SBS in 13~19，suitable for different types of CATV net.
AGC control.
Internal double power which can be changed automatically.
Automatically shell temperature control.
Internal microprocessor software has the function of laser monitoring, parameter display, fault warning, net management and so on. Once the working parameter of the laser goes out of the fixed value of the software, the machine will warn.
The transmitter provides RJ45 and RS232 standard interface for the connecting the computer and monitoring.
Used in middle and small CATV center head end, solve the transmission of trunk and distributive network with high quality and low cost.
Used in second-grade service area of sub-station. With excellent P/P ratio, provide second-grade users with high quality and high reliability value added service such as RFTV, IPTV, VOD and so on. It can avoid the limitation on transmission bandwidth and distance as well as system CSO deterioration caused by laser chirp for adopting 1550nm direction modulated optical transmitter.
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Wanhua Science and Technology Park, No. 528, Shunfeng Road, Donghu Street, Linping District, Hangzhou City, Zhejiang Province 
