VCSEL is the abbreviation of vertical cavity surface emitting laser, which is a semiconductor laser. Its laser is emitted perpendicular to the top surface, which is different from the edge-emitting laser produced by cutting independent chips and emitting laser from the edge. Different from the traditional edge-emitting laser structure, VCSEL has many advantages, such as small divergence angle, far circular symmetry and near-field distribution, which greatly improves its coupling efficiency with optical fiber and does not need complex and expensive beam shaping system.

Demonstration model: Huawei MateBook X system version: win 10 Take Huawei MateBook X and win 10 as examples.

VCSEL is the abbreviation of vertical cavity surface emitting laser, which is a semiconductor laser. Its laser is emitted perpendicular to the top surface, which is different from the edge-emitting laser produced by cutting independent chips and emitting laser from the edge. The structure different from the traditional edge-emitting laser brings many advantages to VCSEL. Its divergence angle is small, the circular symmetry is far, and the near-field distribution greatly improves the coupling efficiency with the optical fiber, so it does not need a complicated and expensive beam shaping system. It has been proved that the coupling efficiency with multimode fiber can be greater than 90%. The short length of the optical cavity leads to the widening of the longitudinal mode spacing, which can realize single longitudinal mode operation in a wide temperature range and has a high dynamic modulation frequency. The reduction of cavity volume makes its spontaneous emission factor several orders of magnitude higher than that of ordinary end-emitting lasers, which leads to great improvement of many physical properties. It can be tested on chip, which greatly reduces the development cost; The light-emitting direction is perpendicular to the substrate, which is easy to realize the integration of high-density two-dimensional array and obtain higher power output. Because multiple lasers can be arranged in parallel in the direction perpendicular to the substrate, it is very suitable for parallel optical transmission and parallel optical interconnection. It has been successfully applied to single-channel and parallel optical interconnection at an unprecedented speed, and is widely used in broadband Ethernet and high-speed data communication networks with its high cost performance. The most attractive thing is that its manufacturing process is compatible with light-emitting diodes (LEDs), and its mass production cost is very low.