It is known that POET makes 200G-800G for FR distance (up to 2Km). The FR distance is used for moving data from one data center to another. 

Did anyone notice the addition of three new OEs with DR distance for 400G and 800G? 

The DR distance is used within a data center with a reach up to 500 meters. This means POET is making an OE foray into the area where all the data processing takes place. This is a highly competitive area where there a number of different types of solutions. 

DR4 and DR8 is on tap for POET beyond OEs. It is for POET modules. From OFC 2024: 

The other buzz phrase was 200G/lane, which is going to be essential architecture in the near term because it will allow for faster signal processing. The 200G/lane POET transmit optical engine, which evolves the work done on the POET Infinity™ chiplet, was among the showcase products that were demonstrated at the company’s OFC booth. The 200G/lane transmitter can be used in 800G FR4 and 800G DR4 applications and, most importantly, in a 1.6T 2xFR4 or 1.6T DR8 format. At OFC, POET showed attendees a live demonstration of its 200G/lane transmit optical engine, featuring an electro-absorption-modulated laser (EML), in action and the outstanding results that included excellent TDECQ and extinction ratio performance.