LT1550 (New Version)

19’’ 1RU 1550nm Laser Transmitter

LT1550 (New Version)

About the Product

The full-spectrum enhanced forward transmitters LT1550 engineered for multi-services operators (MSOs) to increase network capacity to satisfy an ever-growing subscriber demand for bandwidth.

LT1550 operating wavelength conforms to ITU standards and works with PBN’s Erbium Doped Fiber Amplifier Module (EDFA). It allows for fullspectrum analog/digital broadcast and narrowcast channels, providing the utmost flexibility for MSOs during the transition to all-digital.

It employs an advanced RF circuit design and a high quality / low-chirp laser. The module offers a superior frequency response, as well as low distortion and noise characteristics. In addition, it has a cutting-edge optoelectronic design for the delivery of high-quality transmissions, in both analog and digital formats, over passive fiber optic networks.

The standard 19” 1RU rack chassis provides simple installation. Integrated WEB server help users finish the operation and maintenance easily and remotely.

  • DOCSIS 3.1 Compatible with operating bandwidth up to 1218 MHz
  • High quality 1550 nm low-chirp analog DFB laser
  • RF amplifier gain blocks with advanced GaAs technology for better performance
  • Conforms to ITU wavelength DWDM standards
  • Frequency response of 45 MHz to 1218 MHz for both broadcast and narrowcast applications
  • Automatic gain control (AGC) for a consistent optical modulation index (OMI)
  • Automatic thermo-cooler control (ATC) for a consistent laser temperature
  • Automatic power control (APC) for a consistent optical output power
  • Self-contained 19” sub rack 1 RU with integrated universal mains power supply
  • RF input test points
  • Status LEDs indicate module condition and simplify troubleshooting
  • Ethernet port for SNMP/HTTP network management
  • Remote firmware upgrade and auto upload/download of configuration files through integrated web interface or using PBN’s NMSE
Optical Performance
Optical wavelength ITU channel 21 to 51

Optical outputs

1 or 2 ports, on front panel

Optical output power 7, 8, 9, 10 dBm
Optical connector SC/APC, FC/APC, LC/APC, E2000/APC
Laser RIN < -155 dB/Hz
SBS suppression +16 dBm
Fiber length compensation for dispersion 0 ~ 60 km
RF Performance  
RF bandwidth 45 to 1218 MHz
RF flatness ± 0.75 dB
RF return loss > 16 dB (45 ~ 1218 MHz)
AGC range ± 3 dB
RF impedance  75 Ω
RF inputs

2 x RF connectors (SCTE F-Type), on rear panel

BC input level, nominal 15 dBmV for 3.2% OMI (15 to 25)
NC input level, nominal 25 dBmV for 3.2% OMI (25 to 35)
RF test point -20 ±1dB
2x SCTE F-Type on front panel (1)
Isolation between BC and NC inputs > 55 dB (45 - 1218 MHz)
Alarms and laser status Front-panel LEDs, SNMP Traps
Network port 10/100 BaseT with HTTP and SNMP
Link Performance (2)
MER > 38 dB
BER < 1E-9
CNR 52 dB
CSO 63 dB
CTB 65 dB
Power supply Dual power supply unit
90 ~ 264 Vac, 50 ~ 60 Hz
Power consumption 19 W
Dimensions 44 x 483 x 394 mm
Operating temperature -20 ~ 55 ℃
Storage temperature -40 ~ 80 ℃
Humidity (no condensation) 10% ~ 95%


(1) One SCTE F-Type is for NC, and the other one is for Laser input.
(2) Channel Loading: 30 NTSC + 117 channels QAM256 (ITU-T, J.83 Annex-A, 6dB below NTSC). All are measured with PBN referenced optical receiver with 5 km single-mode optical fiber 0 dBm.

U-V Number of Outputs and the Optical Power of each Port
1-07 Single output at 7 dBm
1-08 single output at 8 dBm
1-09 Single output at 9 dBm
1-10 Single output at 10 dBm
2-06 Two outputs and each output is 6 dBm
W ITU grid channel (Optical wavelength)
21 192.1 THz (1560.61 nm)
22 192.2 THz (1559.79 nm)
23 192.3 THz (1558.98 nm)
... ...
49 194.9 THz (1538.19 nm)
50 195.0 THz (1537.40 nm)
51 195.1 THz (1536.61 nm)
35 193.5 THz (1549.32 nm)
X Optical connectors
E E2000/APC
Y Number of 220 Vac Power Supply Units
1A Single mains power supply 220 Vac
2A Dual mains power supplies 220 Vac
1D Single mains power supply -48 Vdc
2D Dual mains power supplies -48 Vdc
AD With two mains power supplies of 220 Vac and -48 Vdc
Z Power Cable
AU Power Cable for Australia
CH Power Cable for Switzerland
CN Power Cable for China
EU Power Cable for Europe (not for use in UK)
UK Power Cable for UK
US Power Cable for USA