... type CATV 1550nm Externally Modulated Optical Transmitter(47~862MHz, CNR1≥53dB, SBS: 13, 16, 18dBm adj.) Product description ... HT8500A, an economical 1550nm Externally Modulated Optical Transmitter, is produced specially ... 53dB, CTB ≤ -65dB, CSO ≤ -65dB, SBS: 13, 16, 18adjustable, Optical transmitter can make CATV network transmit video, audio and data ...