1550nm DFB laser External Modulated Optical Transmitter

BD-5800H,This External Modulated Optical Transmitter is a 1550nm DFB laser  optical transmitter. It is specially developed for the CATV signal that satisfies HFC network, and the long-distance transmission of cable phone and cable data. Working principle It has 7 function modules: RF control, DFB laser, optical modulator, SBS control, CSO control, communication/display control and power supply. Automatic gain control circuit (AGC) or manual gain control circuit (MGC) amplifies the RF signal. AGC or MGC control makes the optical modulator maintain a suitable input level. Use the detected RF root-meansquare (RMS)-total power to calculate the optical modulation index (OMI). In general we recommend using the AGC function, and special users can use the MGC function to adjust the CNR/CSO/CTB performance indexes.The core of transmitter is the optical modulator. The 1550nm signal input the optical modulator, make the laser intensity changed follow the external RF signal voltage, and then gener