Advanced Type Externally Modulated CATV 1550nm Optical Transmitter

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

1550nm externally modulated technology has no laser chirp, low dispersion distortion, and large extinction ratio, with excellent characteristic within 40~862MHz. External Modulator doesn't generate CSO distortion after reasonable bias. It can be followed by amplifier when used in large area coverage of over-long trunk and local networks. Adopting WDM, multi-wavelength optical channels can be transmitted through one fiber. 1550nm optical fiber CATV follows the current development trend of triple-play and fiber to home.

CNOT1550 that accords with current international industry technique standard is a 1550nm Externally Modulated Optical Transmitter. The whole unit light source adopts narrow bandwidth (0.65MHz), low noise, continuous wave DFB laser, which is propitious to reduce the influence of dispersion. The whole unit signal modulation adopts CATV special LiNbO3 external modulator of American company and optimized control technology with independent intellectual property , so it can reach high index of back to back CNR≥53dB, CTB≤-65dB, CSO≤-65dB, SBS: 13~18dBm adjustable. The whole unit is equipped with perfect RS232 communication interface, SNMP network management, 1+1 power supply back-up, and casing temperature auto-control.

CNOT1550, advanced type externally modulated optical transmitter with it's high index, high reliability and excellent cost performance, is applicable for main links and distribution network links in large and middle CATV station head-end.

CNOT1550C: Laser adopts 1548~1563nm CATV standard wavelength, dual fiber output.

CNOT1550U: Laser adopts ITU standard wavelength, wavelength adjustable, dual fiber output. Through the LCD menu in the front-panel, users can adjust and set the wavelength within the range of ±200GHz (±1.6nm) by pushing the button with ±0.05nm stepping.

•      High performance: Externally modulated technology, no laser chirp, low dispersion distortion, high extinction ratio, with                  excellent characteristic within 40~862MHz.

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

•      The operating bandwidth is up to 47~1080MHz.

•      CNR ≥ 53dB and excellent CTB, CSO index.

•      SBS: 13~18dBm adjustable.

•      ITU standard wavelength, ±200GHz (±1.6nm) adjustable.

•      AGC/MGC mode is optional at spot. OMI can be optimized at spot.

•      Perfect RS232 communication interface.

•      Advanced SNMP network management function.

•      1+1 power supply backup, switch automatically.

•      Casing temperature auto-control.

•      Excellent P/P ratio.