HDO378 Transmitter

The HDO378 is a DWDM DFB laser transmitter for digital return path fibre optic links in CATV networks. The module has two return path inputs and one optical wavelength carries two RF return paths. HDO378 transmitter is available at different ITU wavelengths to support DWDM applications. Optical output connector can be factory installed at the rear or at the front panel. Other standard features include a field-replaceable fan unit and remote control of all adjustments.

Features at a glance:

  • Small form factor family, 2 RU height
  • Standardised input and test point levels
  • Adjustable input attenuator and equaliser
  • Integrated driver amplifiers
  • Two RF return paths on one optical carrier
  • High optical output power
  • Long link span
  • Low power consumption
  • Fibre connectors can be located at the rear or at the front panel
  • Local and remote software control of all adjustments
  • Forced cooling through the unit

Product Specifications

Optical parameters
Light source
Cooled DFB with optical isolator
Peak wavelength
1530…1560 nm (ITU ch 59…21)
Output power, nominal value
+10 dBm
Relative intensity noise
-155 dBc/Hz
Transmission distance
100 km
Number of optical outputs
Digital parameters
Data rate
5 Gbps in optical link
Analog to digital conversion
RF parameters
Frequency range
5…85 MHz
RF impedance
75 Ω
Input return loss
18 dB
±0.5 dB
Input level
78 dBµV
Input level adjustment range
0…-15 dB
Equaliser adjustment range
0…6 dB
Test point level vs. input
-21 dB
Number of RF inputs
Number of test point connectors
System parameters
System consists of HDO378, HDO272 and 100 km fibre.
Link gain
20.5 dB
±0.75 dB
CINR peak
53 dB
CINR dynamic range
12 dB within 45 dB CINR window
58 dB
Power consumption
6.5 W
Supply voltages
25 V / 200 mA
6.3 V / 250 mA
RF connectors
F female
2U x 7HP x 380 mm
1.5 kg
EMC compatibility
EN 50083-2
Operating temperature range
0…+45 °C
Storage temperature range
-20…+60 °C
Operating relative humidity
0…85 %
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