Fujitsu Optical Components Limited (FOC) has released a 400G ZR+ transceiver that enables coherent WDM transmission greater than 120km in the same form factors (QSFP56-DD and OSFP) as its 400G ZR transceiver. Both of these transceivers use advanced coherent technology to enable higher bandwidth capacity and lower cost per bit compared to existing 100G WDM technology. FOC has started sample shipments of 400G ZR transceivers, expecting high volume commercial deployment of these 400G coherent products to begin in 2021.
The 400G ZR transceiver ensures interoperability with other manufacturers’ transceivers by using the CFEC, which complies with the OIF Implementation Agreement 400ZR. Error free transmission of data traffic has been demonstrated using FOC’s 400G ZR transceiver on data centre optimised equipment such as Arista’s 7060/7280R3 400GE switches and multi-vendor 400G ZR interoperability testing is currently under preparation.
The 400G ZR+ transceiver is available in the same compact QSFP56 -DD and OSFP form factors as the 400ZR. In addition, the use of OFEC, which has higher performance than the CFEC used in 400ZR, allows for a longer transmission reach and ensures the desired interoperability. NTT Electronics and Acacia Communications have successfully completed module-level interoperability testing between DSPs in 400ZR and OpenZR+ operating modes, using modules supplied by FOC and Acacia. The line interface is configurable from 100GE to 400GE, enabling a wide range of transmission distances. The client interface supports 100GE to 400GE for efficient multiplexing, as shown below in a 4x100G to 400G muxponder application.
OC’s 400G coherent pluggable transceivers use a next-generation coherent platform based on 7nm CMOS process coherent DSP (Digital Signal Processor), silicon photonics integrated optical devices, and high-density packaging technology. This enables a compact size, low power consumption and low cost per bit rate.
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