1550nm External Modulation Optical Transmitter

Product Description

1550nm External Modulation Optical Transmitter

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, AM1550nm External Modulation optical transmitter is the core equipment in this system.
The remarkable advantage for External Modulation technology is no laser chirp, low dispersion distortion. 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, it is the development trend of current fiber CATV networking.
Guangtai HT8500 adopts low noise, narrow bandwidth, continuous wave laser as light source and American JDS-U LiNbO3 external modulator as signal modulation, which eliminates laser chirp effect which is caused by 1550nm laser Internal Modulation. Due to adopting owned system optimized control technology & using top grade key parts.

HT8500A: Standard type, 0.65MHz narrow laser line width, ITU standard wavelength optional, SBS 13~18dBm adjustable, SNMP network management, dual fiber output, apply to the head end of CATV station, trunk network.

Product feature
High performance: External module technology, no laser chirp, low dispersion distortion, high extinction ratio.
Perfect index: Unique creation technology, offers excellent CNR, CTB, CSO & SBS.

Flexibility: Original SBS critical value 13~18dBm adjustable at spot, it can fit for different network, OMI adjustable optimized at spot, AGC mode is optional at spot.
Reliability: 1+1 backup power supply, switch automatically.
Machine case temperature control automatically.
High quality: Intuitionistic Optic Modulation Identity (OMI) display.
Advanced network management function (each unit has separate IP address).

Main application
Applied in over-long trunk of central station.
Analog digital mixture transmission >200Km (with dispersion compensation).
Pure digital transmission (without dispersion compensation) >400Km, (with dispersion compensation) >700Km.
Using in the dividable head end, can provide the added value of IP/QAM, VOD with high quality. It will solve the transmit distance restriction by 1550nm direct modulation optical transmitter and the system CSO deterioration caused by laser chirp.