As the need for bandwidth continues to increase, Facebook is deploying the next generation of optics which expands capacity and offers a seamless transition from 100G CWDM4 optics currently used in our large-scale data centers.
The 200G FR4 OCP specification is based on IEEE 200GBASE-FR4 as defined in IEEE 802.3 bs. It is optimized considering the actual operating conditions of data centers to positively impact the overall yield of the optical transceiver modules. The optimization is done in four areas: reach, temperature, wavelength and link budget. First, the reach is increased to 3km to address the longest intra-DC links. Second, most data centers operate under a well-controlled thermal environment, allowing the operating case temperature of the 200G FR4 optical transceivers to be relaxed from 0-70°C to 15-65°C. As a result, the operating wavelength range can be reduced from +/-6.5nm to +/-5.75nm around the center wavelengths. Finally, the minimum Tx AOP/OMA is relaxed by 1dB compared with 200G FR4 spec to allow for optimum yield across a range of transmitter technologies. The link budget is maintained by tightening the Rx sensitivity by 1dB, leveraging the capability of DSP-based receivers.
To learn more about this product, please the OCP Contribution Database with the link below. Spec, 200G FR4 OCP Optical Transceiver, Facebook.