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Passive CWDM +TV

CWDM+TV passive system is designed for transmission of the analog TV signal and digital data (e.g., Ethernet or STM) via a single fiber between two or more communication nodes.


This multiplexing system allows operators to expand the range of services available to subscribers.


CWDM technology uses a wavelength grid from 1270 nm to 1610 nm in increments of 20 nm (ITU-T G.694.2 standard). Among the grid wavelength values there are those required for the analog TV signal transmission: 1310 nm and 1550 nm. Most optical TV transmitters operate exactly on these wavelengths.


As a standard, the transmission of up to 5 duplex communication channels over a single fiber and one analog TV signal are organized in these systems. When using a narrow-band TV signal transmitter (1525 nm – 1565 nm), the number of implemented duplex communication channels grows to 7.




System Capabilities:


  • joint transmission of up to 7 duplex communication channels and an analog TV signal;
  • support of all transmission protocols;
  • transmission of any kind of traffic: data, voice, multimedia.


Transmission Medium Features:


  • single optical fiber;
  • maximum route length of up to 90 km (depending on fiber-inserted attenuations);
  • maximum value of fiber-inserted attenuations of about 30 dB;
  • the spectral width of the transmitted analog TV signal shall not exceed 60 nm.