Products External Modulation Tx HT8500A

RFTV is a unidirectional analogue and digital video broadcast, it adopts high efficiency modulation mode for RF carrier wave, its economical efficiency, flexibility and bandwidth validity is beyond comparison of IPTV. Adopting EPON or P2P access mode to realize triple-play, FTTx. RFTV broadcasting network in 1550nm optical wavelength still plays an important role, 1550nm External Modulation optical transmitter is the core equipment in this system.

The advantage of 1550nm External Modulation technology is no laser chirp, low dispersion distortion, and large extinction ratio, with excellent characteristic within 40~862MHz in-band. External Modulator doesn't generate CSO distortion after reasonable bias. Followed by amplifier when apply in large area coverage of over-long trunk and local networks. Adopting WDM is the development trend of CATV network to transmit optical channels with multi-wavelength through one fiber. 1550nm CATV optical fiber accord with developing trend of current triple-play, fiber to home.

Huatai HT8500A is a mode which accord with International currency technique standard 1550nm External Modulation Optical Transmitter, complete appliance light source adopts narrow bandwidth ( 0.65MHz ), low noise, continuous wave DFB laser, it is propitious to reduce the influence of chromatic dispersion. Complete appliance signal modulation adopts appropriative LiNbO3 external modulator of USA JDS-U company, combine with optimal control technology from Huatai independent intellectual property rights, to reach “back to back” CNR ≥ 53dB, CTB ≤ -65dB, CSO ≤ -65dB, SBS: 13, 16, 18dBm adjustable high index. Complete appliance equipped completely RS232 communication interface and SNMP network management, 1+1 power backup, chassis temperature auto control.

Huatai HT8500A currency standard type external modulation optical transmitter, take advantage of its high index, high reliability and excellent cost performance, apply to use in the head-end of large and medium-sized CATV station., for the main route network and distribution network.

HT8500AC: Laser adopts 1548~1563nm CATV standard wavelength, dual fiber output.

HT8500AU: Laser adopts ITU standard wavelength, wavelength tunable, dual fiber output. Through the LCD menu in the front-panel, push the button with ±0.05nm adjustable, adjust and set up the laser wavelength around ±200GHz (±1.6nm) , suitable for the network upgrade and expend.

High performance: External modulate technology, no laser chirp, low dispersion distortion, high extinction ratio, with excellent characteristic within 40~862MHz in-band.

Narrow bandwidth (0.65MHz), lower noise, DFB continuous wave laser, in order to reduce the influence of the dispersion.

CNR ≥ 53dB and excellent CTB, CSO index.

SBS: 13, 16, 18dBm adjustable.

ITU standard wavelength adjustable, user should adjust and enactment the laser wavelength over the front-panel with ±0.05nm stepping within range ±200GHz (±1.6nm), it suit for WDM system, network upgrade and expend the capability (HT8500AU).

AGC/MGC mode is optional at spot. OMI adjustable optimized at spot.

Consummate RS232 communication interface.

Advanced SNMP network management function.

1+1 power backup.

Machine temperature control automatically.

Excellent P/P ratio.

Head-end of large and medium-sized CATV central office, use for main route network and distribution network.

    Analog digital mixture transmission >200Km (with dispersion compensation).

    Pure digital transmission (without dispersion compensation) >400Km, (with dispersion compensation) >700Km.

HT8500AU ITU wavelength adjustable, apply to DWDM fiber optic CATV system increment business and CFG dispersion compensation system.

It should be used in branch FTTH that has high system index demand. Point to Point>65Km, CSO≤-65dB. It should supply RFTV and IPTV, VOD etc. increment business to the two-class server users with high performance and high reliability. It can avoid the limited of CSO deterioration and transmission distance caused by laser chirp because of adopt 1550nm direct modulation optical transmitter.