The downstream 1310 optical transmitter is mainly used for optical fiber transmission of downstream analog television signals, digital television signals and CMTS data signals in HFC network. Two input signals with high-isolation can be used to meet various inserted signals. It has high CNR and low distortion.
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● CNR, CSO, CTB indicators are high.
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Item |
Unit |
Parameter |
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Optical Part |
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Output optical wavelength |
nm |
1310 ± 20 |
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Output optical power |
mW |
4 ～ 31 |
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Laser type |
— |
DFB laser |
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Optical modulation mode |
— |
Direct optical intensity modulation |
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Optical connector type |
— |
SC/APC or FC/APC |
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Optical return loss |
dB |
> 45 |
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RF Part |
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Frequency range |
MHz |
47 ～ 870/1003/1218 |
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Flatness in band |
dB |
± 0.75 |
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RF input impedance |
Ω |
75 |
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Input test port |
dB |
-20±1 |
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Laser drive level test port |
dB |
-20±1 |
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Input return loss |
dB |
≥ 16 |
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Input port isolation |
dB |
≥ 50 |
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C/N |
dB |
≥ 52 |
550MHZ 59CH analog signal 77dBuV/CH 550-870MHZ 40CH digital signal 67dBuV/CH -1dBm optical receiving power, 0KM fiber |
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C/CTB |
dB |
≥ 67 |
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C/CSO |
dB |
≥ 62 |
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RF input level |
dBuV |
77±5 |
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Adjusting range under AGC mode |
dB |
± 5 |
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MGC attenuation range |
dB |
0 ～ 20 |
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Others |
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Operating temperature |
℃ |
-5 ～ + 55 |
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Storage temperature |
℃ |
-30 ～ + 70 |
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Maximum power consumption |
W |
≤10 |
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Weight |
Kg |
1 |
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