 Product description With the development of satellite TV technology, direct broadcast satellite TV (DBS) develop rapidly with its particular advantage, Digital Video Broadcasting-satellite (DVB-S), Digital Video Broadcasting-terrestrial (DVB-T) and Digital Video Broadcasting-cable competition and fusion be sparked.
Huatai HES-26A series 1550nm external modulation optical transmitter can transmit 47~862MHz and 950~2600MHz analogue signal and digital signal via one single fiber by frequency division multiplexing. It is compatible with any FTTx PON technology, and provides a complete set of high quality low cost fiber trunk transmission and fiber to the building (FTTB), fiber to the house (FTTH) solution for the direct broadcast satellite TV (DBS) and cable analogue TV (CATV) fusion.
HES-26A has ITU standard wavelength, ±1.6nm adjustable optional. Adopts multi-wavelength application of DWDM system, achieve network upgrade and expansion.
HES-26A adopts low noise, narrow linewidth, continuous wave as the optical source, LiNbO3 external modulator as signal modulation, to eliminate 1550nm chirp effect when modulating the 1550nm laser directly. HES-26A adopts narrow line width, low noise, continuous wave DFB laser as light source. It adopts LiNbO3 externally modulated as signal modulated, eliminate chirp of 1550nm laser direct modulated and Huatai independent intellectual property rights of optimize control technical, the key equipments are all world up-level brand. Whole unit equipped perfect RS232 communicate interface and SNMP network management, 1+1 power supply back-up, chassis temperature auto control. The whole unit has high quality and reliability and excellent P/P ratio.
HES-26A-2口口-1550: dual fiber output, 1547~1563nm CATV operating wavelength, CNR≥53.5dB, SBS: 13~19dBm adjustable.
HES-26A-2口口-15口口: dual fiber output, 1528~1563nm ITU standard wavelength, ±1.6nm adjustable, CNR≥53.5dB, SBS: 13~19dBm adjustable.
HES-26A-1口口-1550: single fiber output, 1547~1563nm CATV operating wavelength, CNR≥52dB, SBS: 13dBm.
HES-26A-1口口-15口口: single fiber output, 1528~1563nm ITU standard wavelength, ±1.6nm adjustable, CNR≥52dB, SBS: 13dBm.
 Product feature  High linearity: External modulation technology has no laser chirp, no chromatic dispersion distortion, large extinction ratio.
Narrow linewidth (<1MHz), low noise, DFB continuous wave laser, be propitious to reduce dispersion.
High index: unique innovative technology, provide excellent CNR, CTB, CSO, SBS.
High bandwidth: contemporary transmit Analog TV, DVB-C and DVB-S.
Be compatible with FTTx PON technique.
SBS threshold adjustable, suitable for different network.
OMI optimize adjustable, AGC/MGC mode optional.
Chassis temperature auto control.
ITU standard wavelength, user step by step ±0.05nm in front panel, in±200GHz (±1.6nm) range, to adjust and set laser wavelength, suitable for upgrade and dilatation of WDM system and network.
Perfect RS232 communicate interface and SNMP network management.
1+1 power back-up.
Excellent P/P ratio.
Main application Apply to the extra-long trunk of the central office to transmit analogue and digital TV signal and IF/SAT.
Analogue / digital mixed transmission > 200Km (with dispersion compensation).
Pure digital transmission (without dispersion compensation) > 400Km, (dispersion compensation) > 700Km.
Apply to sub-office (sub-head end), providing value-added service like high quality analogue and digital TV, satellite direct TV, also the IPTV and VOD to the users in secondary service area, avoid CSO deterioration and distance limitation caused by the laser chirp when adopting 1550nm direct modulation optical transmitter.
Product Series Comparison Table HES-26A optical transmitter electrical schematic diagram The application of HES-26A in FTTx PON |
