1550nm VCSEL Laser Diode

Vertical-Cavity Surface-Emitting Laser, or VCSEL for short, is a semiconductor laser that emits light vertically from the top surface.Based on GaAs semiconductor material, it differs from both LEDs (Light-Emitting Diodes) and LDs (Laser Diodes).The structure consists of mirrors, an active layer, and a metal contact layer.The two emission mirrors are P-type and N-type Bragg reflectors respectively.The active region is composed of quantum wells.A metal contact layer is formed on the outer surface of the P-type DBR to provide ohmic contact,and a circular aperture is patterned on the P-type DBR for laser output.It features a small far-field divergence angle with a narrow and circular beam;low threshold current and high modulation frequency up to 300 kHz.Wavelength tuning can be achieved by varying the drive current and temperature.Packaged with built-in TEC and PD, it is specifically designed for high-speed optical fiber communications.