EMOT-1550S 1550nm Standard External Modulation Optical Transmitter

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1550nm Standard External Modulation Optical Transmitter

  FOT EMOT-1550S series is a Standard type of high-performance 1550nm external modulation optical transmitter. It is especially designed for small or middle-size TV stations, CNR ≥51.50dB when tested in 59CH PAL/D, SBS set at 18dBm, point to point 50km fiber. Mounted in standard 1U, 19’’ chassis, the output signal spectral lines is narrow, more advantages in the long-distance transmission.
Key components adopt DFB low-noise, narrow line-width, continuous-wave lasers with thermoelectric cooling device made in JDSU, Fujitsu, MITSUBISHI and AVANEX CATV high linearity external modulator. It can provide high-quality images, digital or compressed digital signal long-distance transmission for cable television and telephone communications.


  • Original system optimization control technology and RF pre-distortion technology to ensure the system can acquire the maximum CTB, CSO, and SBS targets.
  • In ensuring the high performance system CSO, the phase modulation technology of external modulator maximize the optical power into the fiber in order to obtain long-distance transmission, and the field adjustable SBS threshold 13,16,18, may apply a different network transmission.
  • 19 “1U standard rack, built-in high-performance switching power supply, which work at 85~ 265VAC MS level automatic switch, chassis cooling can be automatic control by temperature.
  • Machine equipped with microprocessor monitors the working state of the laser, the panel LCD window displays the operating parameters.
  • Network management: RS232 port for local management and monitoring, RJ45 port for remote control and management.


Laser typeDFB laser
Wavelength (nm)1550±10
Optical ModulationExternal modulation
Optical output power (dBm)1x5, 1x7, 1x9, 2x3, 2x5, 2x6
SBS threshold (dBm)16.5,Optional 13, 16, 18
Optical ConnectorSC/APC or FC/APC
Frequency range (MHz)47~750(862)
CNR (dB)≥51.5
Flatness (dB)±0.75
RF input level (dBuV)78~88 AGC automatic control
C/CTB (dB)≥65.0
C/CSO (dB)≥65.0
RF input impedance (Ω)75
RF Input Return Loss (dB)≥16(47~550)MHz
Voltage (V)90~265VAC,Optional -48VDC
Power consumption (W)     ≤50 (Single-supply operation)
Working Temperature0~50 ℃ (Automatic temperature control)
Storage temperature-20~85 °C
Relative humidity20%~85%
Size (W)*(D)*(H)19 ″ *11 ″ *1.75 ″
Network management interfaceRJ45,Supporting the browser and SNMP
Communication interfaceRS232,Optional


  1.  In the condition of stipulated link-loss, configured in 59 PAL-D analog television channel signals within 550MHz frequency, in the range of 550MHz~750 (862) MHz frequency transmit digital modulation signals, digital modulation signal level (in 8MHz bandwidth) is 10dB lower than the analog signal carrier level, when the optical input power is 0dBm, you can measure the carrier combination triple beat ratio (C/CTB), carrier combination of second-order beat ratio (C/CSO) and the carrier to noise ratio (C/N)
  2. Fiber: 50KM+EDFA

Model series

Model1550nm Standard External Modulation Optical Transmitter SBS=13/16/18,CNR≥51.5dB
EMOT-1550S-1X5Single optic port, optical power≥5dBm
EMOT-1550S-1X7Single optic port, optical power≥7dBm
EMOT-1550S-1X9Single optic port, optical power≥9dBm
EMOT-1550S-2X3Dual optic port, each port optical power≥3dBm
EMOT-1550S-2X5Dual optic port, each port optical power≥5dBm
EMOT-1550S-2X6Dual optic port, each port optical power≥6dBm
EMOT-1550S-2X7Dual optic port, each port optical power≥7dBm

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