Original
By certification 
External Optical Transmitter
1550nm
1550 external optical transmitter is desinged especially for the transmission of CATV signal, cable telephone and cable data. It has DFB diode as light source.First, it modulates through external modulator at the way of AM-VSB, then transmits the video and signal to optical receiver which then transfer to electrical signals, thereafter, the electrical signals will be distributed to all the subscibers. This equipment would be used for playing program or the long-distance transmission of the video & signal of HFC system
Parameter：
| Type | Item |
Units |
Parameter |
Description |
Optical character |
Laser wavelength |
nm |
1550±10 |
ITU-TG.692 standard is referable |
Side mode compression ratio |
dB |
35 |
Typical value >40 |
|
Relative light intensity noise |
dBc/Hz |
<-158 |
Typical value<-160 |
|
Output power |
dBm |
2×* |
2×5、2×7、2×9 Or 1×5、1×7、1×9、1×10 for option |
|
Optical return loss |
dB |
≥60 |
||
Optical fiber connector |
FC／APC |
SC／APC、E-2000 for option |
||
RF Character |
Bandwidth |
MHz |
47-862 |
|
Input level |
dBuV |
75±5 |
AGC |
|
AGC dynamic range |
dB |
+2~-4 |
||
Flatness |
dB |
≤±0.75 |
47~862MHz |
|
Return loss |
dB |
＞16 |
47~862MHz |
|
Input resistance |
Ω |
75 |
||
|
Link circuit Character |
Tranmission channel |
PAL-D/84ch | ||
CNR |
dB |
≥52 |
65Km optical fiber，0dBm receiving |
|
CTB |
dB |
≤-65 |
||
CSO |
dB |
≤-65 |
||
SBS |
dBm |
≥16.0 |
13、16、18 for option |
|
Common Characteristic |
Web management interface |
RJ45，R232 | Support SNMP or browser |
|
Power supply |
V |
90~265VAC |
-48VDC |
|
Power loss |
W |
≤50 |
Single power supply |
|
Work temperature |
℃ |
0~50 |
Full-auto chassis temperture controlling |
|
Stock temperature |
℃ |
-20~85 |
||
Relative temperature |
℃ |
20%~85% |
||
Size |
″ |
19″×16.5″×1.75″ |
（W）×（D）×（H） |
