The CAB-LC8-CS is a passive, 8 channel, colorless, optical power coupler and splitter, packaged as a simple fiber breakout cable. As shown in the image below, the cable's eight LC connectors directly connect to eight 400ZR transceivers. Optical signals from the 400ZR modules are power-combined / split into / from a single fiber pair which is terminated into a duplex-CS connector. The duplexCS connector of the cable connects to the OSFP-AMP-ZR or QSFP-AMP-ZR for amplification and transmission over 120 km of fiber.
The CAB-LC8-CS is "colorless" allowing each pair of 400ZR transceivers connected over the DWDM link to be tuned to any wavelength in a 200 GHz spaced C-band grid, provided the wavelength chosen is unique. In the transmit direction, the optical output from up to eight 400ZR modules are power-combined onto the transmit fiber. In the receive direction, all of the wavelengths received from the line-side fiber are broadcast to all of the 400ZR transceivers connected to the CAB-LC8-CS. Each 400ZR transceiver selects the wavelength of interest by tuning it's coherent DWDM receiver to the desired wavelength.
