400G ZR DCI
400G ZR DCI solution provides high-performance, long-distance transmission capability for data center interconnect. By using coherent optical technology, it enables high-speed data transmission in metro and regional networks.
Figure 1: Transceiver line card with 400ZR amplified point-to-point interface
Figure 2: Router Switch line card with 400ZR DWDM Interfaces
Figure 3: Transceiver line card with 400ZR DWDM interfaces
Figure 4: Router/Switch line card with 400ZR unamplified point-to-point Interface
400G ZR+ Breakout
4x 100GE multiplexing on OpenZR+ transceivers is valuable in operator networks in which all routers have not yet been migrated to 400GE. The 4x 100GE mode allows for 400GE-ready and 100GE-capable routers to talk to each other. An example of such a layout is shown below. A 4x100GE muxponder that hosts an 400G OpenZR+ transceiver can break 400G OpenZR+ interface on a router to 4x 100GE QSFP28 clients to connect into 100GE ports on the far-end router.
Figure 1: 4x 100GE break-out use case for 400G OpenZR+
The key transmitter specifications for OpenZR+ that affect the add-drop on the terminal site are as follows:
- Launch power of -10 dBm for 400G OpenZR+ mode → The lower launch power will mandate an amplifier in the add path of the multiplexer.
- Baud-rate of 60 GBd/s → The add-drop and the terminal must support a minimum bandwidth of 75 GHz. This is available in most coupler-based or AWG-based add-drops as well on flex-grid Wavelength Selective Switch (WSS) modules.
- Out-of-band OSNR of 23 dB → The low out-of-band OSNR will make couplers difficult to use. A filtered add-drop will be preferred.
The key receiver specifications for OpenZR+ that affect the add-drop on the terminal site are as follows:
- Receiver noise limited power sensitivity of -12 dBm → An amplifier may be required in the drop section of the multiplexer.
- Launch power of -10 dBm for 400G OpenZR+ mode → The lower launch power will mandate an amplifier in the add path of the multiplexer.
- Baud-rate of 60 GBd/s → The add-drop and the terminal must support a minimum bandwidth of 75 GHz. This is available in most coupler-based or AWG-based add-drops as well on flex-grid Wavelength Selective Switch (WSS) modules.
- Out-of-band OSNR of 23 dB → The low out-of-band OSNR will make couplers difficult to use. A filtered add-drop will be preferred.
The key receiver specifications for OpenZR+ that affect the add-drop on the terminal site are as follows:
- Receiver noise limited power sensitivity of -12 dBm → An amplifier may be required in the drop section of the multiplexer.
Figure 2: Add-drop and terminal layout for OpenZR+