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Optical Transceiver | Case study of Photodiode
- Photoelectric conversion devices supporting the evolution of data centers
- With the advancement of AI technology and the increase in data communication volume, the optical transceivers used in data centers are transitioning from the conventional 100Gbps to 800Gbps around 2024, with even greater capacity and speeds expected in the future, reaching 1.6Tbps and 3.2Tbps. Dexerials' photodiodes deliver the key performance required for next-generation high-speed optical transceivers, driving technological innovation in data centers.
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Application
Support for ultra-high speed optical communications
In a waveguide photodiode, light incident from the side is absorbed as it propagates through the semiconductor "waveguide" layer and converted into an electrical signal. This structure achieves both excellent sensitivity and high-speed signal transmission. Furthermore, by combining it with UTC-PD technology, ultra-high-speed operation of over 300 GHz and high-current output are achieved, supporting next-generation optical communications.
High-speed response and miniaturized components
Waveguide photodiodes have a thin waveguide layer, which shortens the travel time of electrons and holes generated by light to reach the electrode, achieving high-speed response.Furthermore, the device can be made thinner, making it easy to integrate it with other optical components on the same substrate, contributing to the miniaturization of the entire system.
Product characteristics
Waveguide structure
Unlike conventional "surface-illuminated" photodiodes, in which light is incident from above, photodiodes with a "waveguide" structure allow light to enter from the side of the device and propagate horizontally along the internal light absorption layer. Lateral light propagation allows for a longer distance to be traveled, increasing the light absorption efficiency, while a thinner waveguide layer shortens the time it takes for electrons and holes to reach the electrode. This structure enables both "fast response" and "high sensitivity."
Further speed improvement through integration with UTC-PD technology
UTC-PD is a new technology that further increases the speed of waveguide photodiodes. Normally, holes in semiconductors move slower than electrons, which hinders speed increases. However, UTC-PD solves this problem by utilizing a phenomenon called "dielectric relaxation" to cause holes to flow in a "swarm" all at once. Furthermore, by providing a transport layer dedicated to electrons, it prevents speed reduction and output saturation due to interference with holes, achieving high-speed, high-output operation.
Product information
Optical Semiconductor
