Direct modulation will lead to high laser chirp (Laser's bias current is modulated by signal and the optical spectrum shifts and shakes). Laser chip will interact with dispersion effect caused by standard single mode fiber (SMF-28), which will generate serious distortion in the place of 1550nm. This kind of distortion will become more serious with the increase of transmission distance, bandwidth and channel number.
At present, international high performance 1550nm direct modulation has no obvious performance inferior while transmitting an analog and digital multiplexing full channel signal with transmission distance≤15Km.
Junpu JP1510DT is a 1550nm direct modulation optical transmitter with high index and AGC function. It adopts high linearity and low chirp DFB laser, built-in pre-distortion compensation and AGC, APC, ATC closed loop control, which improves the system index obviously. JP1510DT direct modulated optical transmitter can be used in WDM narrow-band multiplexing and IP/QAM.
JP1510DT optical transmitter: CATV wavelength.
| Performance | Index | Supplement | ||
| Optic feature | Wavelength | (nm) | 1548~1565 | JP1510DT |
| Output power | (dBm) | 10 | Optional 3, 8, 10 | |
| Return loss | (dB) | ≥55 | ||
| optical fiber connector | FC/APC | Optional SC/APC | ||
| RF feature | Work bandwidth | (MHz) | 45-862/1000Mhz | |
| Input level | (dBmV) | 20±2 | MGC | |
| Flatness | (dB) | ≤±0.75 | 45~862MHz | |
| Return loss | (dB) | >16 | ||
| Input impedance | (Ω) | 75 | RF/INPUT | |
| RF test | (dB) | 0±1 | ||
| Link feature | Transmit channel | PAL-D/60CH | NTSC/80CH | |
| CNR | (dB) | ≥50 | -1dBm receive | |
| CTB | (dB) | ≤-63 | ||
| CSO | (dB) | ≤-57 | ||
| General feature | Network management interface | RJ45, RS232 | Support I.E. & SNMP | |
| Power supply | (V) | 90~265 city power | -48VDC optional | |
Low chirp, high linearity DFB laser, chirp compensation
Full-automatic OMI control, AGC & MGC
Intuitionistic modulation status display
Built-in dual back-up power supply, switch automatically
Casing temperature auto-control, ensure the long life of the laser
CATV Networks
Local Area Networks
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Wanhua Science and Technology Park, No. 528, Shunfeng Road, Donghu Street, Linping District, Hangzhou City, Zhejiang Province 
