6T optical modules, EML (Electro-Absorption Modulated Laser) chips must be fabricated on InP substrates because indium phosphide can efficiently emit light while naturally covering the two key low-loss optical fiber windows: 1310nm and 1550nm. In the AI optical communication industry chain, indium phosphide (InP) and thin-film lithium niobate (TFLN) play very different — yet equally indispensable — roles. One is the material that “creates the heartbeat” of optical communication, while the other “controls the bloodstream. ” The former. In part II of a four-part series, we take a closer look at a base material that stands out for its ability to produce light, thus allowing for the fabrication of active components: Indium Phosphide. InP has the longest history of all three major integrated-photonics platforms, which also include. Indium Phosphide (InP) is a semiconductor material that has become increasingly important in the world of photonics, particularly for photonic integrated circuits (PICs). To deliver this bandwidth, optical vendors are developing a broad range of coherent optical transceiver addressing diferent segments of the market, each with its own set of design considerations.