HDO777 Transmitter

The HDO777 downstream transmitter supports frequencies up to 1218 MHz and has one +11 dBm output. HDO777 is an externally modulated 1550 nm C-band DWDM transmitter for short, medium and long distances. It supports broadcast and broadband and narrowcast services in digital and analogue formats.

Features at a glance:

  • DOCSIS 3.1 compatible
  • External modulation enables different link spans from one transmitter (more than one receiver)
  • External modulation doesn’t require dispersion compensation
  • Standard and high SBS suppression models available
  • Standardised input and test point levels
  • Low power consumption and high performance
  • Two inputs with level adjustments
  • Equaliser in both inputs
  • High isolation between inputs
  • Unused input can be switched off for power saving and noise reduction
  • Integrated input amplifiers and laser driver amplifiers
  • Automatic power control providing constant total OMI as standard feature
  • Optional spectrum analyser function
  • Optional 3-way output splitter
  • Optional integrated xWDM filter to combine forward and return paths into one fibre or to combine various forward wavelengths into one fibre
  • 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
L-EML, monolithic InP device
Peak wavelength
1530…1560 nm (ITU ch59…21)
Output power, nominal value
+11 dBm or +6 dBm
SBS suppression, option A
– RF load starting from 45 MHz
– RF load starting from 85 MHz
– RF load starting from 112 MHz
– RF load starting from 200 MHz

+ 12 dBm
+14 dBm
+15 dBm
+16 dBm
SBS suppression, option H
+19 dBm
Relative intensity noise
-153 dBc/Hz
OMI per channel
2.6 %
Pass band of optional xWDM filter
Pass channel
Reflect channel, DWDM
Reflect channel, CWDM

±0.12 nm (DWDM) or ±6.5 nm (CWDM)
1520…1565 nm except the pass channel
1260…1620 nm except the pass channel
Number of optical ports
1, 2 or 3
RF parameters
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
10 dB
Equaliser adjustment range
0…6 dB
Isolation between inputs
50 dB
Spectrum analyser module (option)
Measurement range
47…1218 MHz, 0.25 MHz steps
Measurement bandwidth
0.35 MHz
Dynamic range
58…98 dBµV
Measurement accuracy
±1 dB
Noise and distortion performance
Link C/N, -2 dBm to optical receiver
51 dB
62 dB
62 dB
40 dB
Power consumption
9 W
Supply voltages
25 V / 330 mA
6.3 V / 150 mA
RF connectors
F female
Optical connector
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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