Question · Q1 2026
Christopher Rolland asked about Lumentum's strategy for using its EML supply to drive new customer qualifications for 1.6T transceivers, and whether customers might stockpile EMLs ahead of 1.6T ramps. He also questioned the potential for overcapacity in indium phosphide, considering competitors' 6-inch InP ramps and the eventual shift to SiPho/CW, and what prompted Lumentum's decision to expand capacity.
Answer
President and CEO Michael Hurlston clarified that due to demand far outstripping supply, Lumentum is consolidating supply and customer base around long-term partners rather than broadly adding new customers. He noted that the capacity expansion came from improved throughput and yield on existing 4-inch fabs, not significant new capital. Michael Hurlston also stated that while CW will ramp with 1.6T, EMLs will also increase, and the absolute numbers for both are expected to be 'stratospherically high' for the next six quarters. President of Global Business Units Wupen Yuen added that their capacity is interchangeable between CW and EMLs, allowing flexibility regardless of market share shifts.