POET unveils first flip-chip DML lasers POET Technologies Inc of Toronto, Ontario, Canada — designer and developer of the POET Optical Interposer and photonic integrated circuits (PICs) for the data-center and telecom markets — has completed and tested its high-speed directly modulated laser (DML) designs using a distributed feedback (DFB) structure and flip-chipped these lasers onto its Optical Interposer platform, which also incorporates several other industry-first accomplishments, it is claimed. The flip-chip assembly technique enables a true single-chip, fully integrated Optical Engine to be produced at wafer scale, resulting in what is reckoned to be the lowest-cost, smallest-size 100G CWDM4 Optical Engine (with a form factor of 9mm x 6mm), while including banks of four lasers, four monitor photodiodes, four high-speed photodiodes, a multiplexer, demultiplexer, taps for power monitoring and features supporting a self-aligned fiber attach unit.