Internal Modulated will generate serious laser chip effect (bias current of the laser will be modulated by signal; optical spectrum will shift and shake). Chip effect will interact with dispersion of standard single fiber 1550nm window, which causes serious distortion (CNR deterioration). The distortion will be more serious with the increasing of transmission distance, bandwidth and number of channels. For many years, we have developed a lot of research and experiments in chip compensation of Internal Modulated, but do not have any breakthrough yet. The most advanced 1550nm Internally Modulated optical transmitter in the world can only transmit the signal for 15Km with CSO ≤ -57dB in the bandwidth of 600MHz, while its price is very expensive. But CSO ≤ -57dB is the lowest threshold for end subscribers. Therefore, the current 1550nm Internal Modulated optical transmitter cannot meet the technical requirements of the developing networking of second-grade service area.
HT8510, a kind of low cost 1550nm Externally Modulated Optical transmitter, is specially designed for networking application of second-grade service area. It is named as HT8510 second-grade service area 1550nm Externally Modulated Optical Transmitter. HT8510 series Externally Modulated CATV transmitter adopts low noise, narrow bandwidth, and continuous wave laser DFB laser as its light source and adopts low cost single-output LiNbO3 external modulator that is specially designed by JDS-U to modulate signal, which reduce the cost of the transmitter largely. Based on a series of characterized optimization and technical innovation, HT8510 Optical transmitter can reach excellent system index with flatness ≤ 0.75dB in-band 47~862MHz, 13dBm SBS, point to point >50Km, (0dBm receiving) CSO ≤ -65dB, CTB ≤ -65dB, CNR ≥ 52dB. The whole unit is equipped with perfect RS232 communication interface, SNMP network management, 1+1 back-up power supply, and casing temperature auto-control. All the optical port for HT8510 Optical transmitter can be installed in the front panel (The back panel is also available if needed).
HT8510 second-grade service area 1550nm Externally Modulated Optical Transmitter, with its high index, high reliability and outstanding P/P ratio, is an ideal choice for second-grade service area.
HT8510C optical transmitter: single output, operation wavelength 1547~1564nm, laser linearity width 1MHz, SBS: 13dBm.
HT8510U optical transmitter: single output, ITU standard wavelength adjustable. Through LCD menu and the button on the front panel, laser wavelength can be set and adjusted with ±0.05nm stepping in the range of ±200GHz (±1.6nm). It is applied for upgrading and expansion of WDM networking.
- High performance: no laser chirp, low dispersion distortion, high extinction ratio, with excellent characteristic within 40~862MHz in-band.
- Narrow linearity width (Typ=1MHz), low noise, DFB continuous wave laser.
- The operating bandwidth for HT8510 Optical transmitter is up to 47~1080MHz.
- High index: unique innovation technology, offers excellent CNR, CTB and CSO.
- SBS: 13dBm, point to point>50Km optical transmission.
- ITU standard wavelength, ±200GHz (±1.6nm) adjustable.
- AGC/MGC mode is optional at spot. OMI can be optimized at spot.
- Optional RS232 communication interface and SNMP.
- Optional 1+1power supply backup.
- Casing temperature auto-control.
- Excellent P/P ratio.
HT8510 Optical transmitter used in second-grade service area of sub-station. With excellent P/P ratio, provide second-grade users with high quality and high reliability value added service such as RFTV, IPTV, VOD and so on. It can avoid the limitation on transmission bandwidth and distance as well as system CSO deterioration caused by laser chirp for adopting 1550nm direction modulated optical transmitter.
|Nume||HT8510 - Second-grade service area Externally Modulated Optical Transmitter (Single-port CNR ≥ 52dB, SBS:13dBm)|
|Ţara de origine||China|