HDO761 Transmitter

The HDO761 downstream dual transmitter supports frequencies up to 1218 MHz and is available with an output power of 10 dBm. HDO761 is a 1550 nm DWDM transmitter for long distances. It supports broadcast and narrowcast and services in digital format.

Features at a glance:

  • DOCSIS 3.1 compatible 1.2 GHz bandwidth
  • ITU wavelengths in 100 GHz grid
  • Electrical dispersion compensator provides a good CSO performance at longer transmission distances
  • Standardised input and test point levels
  • Low power consumption and high performance
  • Four identical inputs with individual level and slope adjustments
  • High isolation between inputs
  • Unused 2nd inputs can be switched off for power saving and noise reduction
  • Drive amplifier can be set to power save mode in narrowcast load conditions
  • Integrated input amplifiers and laser driver amplifiers
  • Automatic power control providing constant total OMI as a standard feature
  • Optional integrated DWDM filtering to combine two different  ITU wavelengths into one common output and enabling optical daisy chaining of multiple HDO761 transmitters
  • Fibre connectors can be located at the rear or at the front panel
  • Small form factor family, 2 RU height
  • 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 ch59…21)
Output power
+10 dBm
SBS suppression, max. launch power
Standard option A
High power option Y

+16 dBm
+18 dBm @ max. fibre length 20 km
Relative intensity noise
-154 dBc/Hz
OMI per channel
2.6 %
Link length setting
0…40 km
Pass band of optional xWDM filters
Pass channel
Reflect channel, DWDM

±0.12 nm
1520…1565 nm except the pass channels
Number of optical ports
RF parameters
RF inputs
Two identical inputs
Frequency range
47…1218 MHz
RF impedance
75 Ω
Input return loss
18 dB
±0.4 dB
Automatic power control (APC)
Laser test point level for 4.5 % OMI
78 dBμV
Input level
77 dBμV
Level adjustment range
-15…0 dB
Equaliser adjustment range
-6…+1 dB
Isolation between inputs
50 dB
Noise and distortion performance
40 dB
Noise and distortion performance MER 40 dB BER
Power consumption
13 W, (17) W
Supply voltages
25 V / 510 mA (670 mA)
6.3 V / 0 mA
RF connectors
F female
Optical connector
SC/APC, E-2000
Field replaceable fan
Dimensions (h x w x d)
2U x 7HP x 380 mm, Occupies 1/12 of HDX002
1.5 kg
EMC compliance
EN 50083-2
Enclosure classification
Operating temperature range
0…+45 °C
Storage temperature range
-20…+60 °C
Operating relative humidity
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