Supply chain redundancy within the great wall is very important. And if one looks at the developmental history of the company it is solid. 

“As we start ramping production of our optical engines, securing an additional reliable laser source that is well established in the industry with known good quality is of utmost importance to our business,” said Dr. Suresh Venkatesan, Chairman & CEO of POET. 

One can conclude that POET has been working with Yuanjie for a significant amount of time as per the following line:  

“Our partnership with YST has enabled POET and SPX to deliver reliable, high-performance optical engines to customers.