![]() ![]() ![]() ![]() Transmitting at 850nm for up to distances of 500 metres over multimode fiber, VCSELs have a lower power consumption than edge-emitting semiconductor lasers and are suitable for high-speed communications in networks and enterprise datacenters. In addition, their design means that thousands of VCELs can be processed simultaneously. The way that VCSELs are constructed means that it is possible to test for quality and processing issues at different stages throughout the production process, whereas edge-emitting lasers cannot be tested until the end of the production and are wasted if they are found to be of low quality. This gives it some advantages over edge-emitting lasers during the production process which reduces the fabrication costs whilst ensuring quality. VCSEL (Vertical-Cavity Surface-Emitting Laser)Īs the name suggests the VCEL emits the laser beam perpendicular to the surface of the semiconductor wafer. Edge-emitting lasers were the first semiconductor lasers and are still in use today. There are different designs of fiber optic laser: edge-emitting semiconductor lasers (also known as in-plane lasers) which emit the laser beam along the same direction as the wafer surface of the semiconductor chip and, surface-emitting lasers, which emit the light in a perpendicular direction to the wafer surface. The photons (light particles) are then reflected through the optical resonator which creates the output laser beam. In very simple terms, the laser works by applying an electrical current to the optical gain medium which excites electrons, then, as the electrons lose energy, they release photons. A fiber optic laser consists of three components, an energy/pump source, a gain medium and an optical resonator which is formed by two or more optical lenses. Laser is an acronym for “Light Amplification by Stimulated Emission of Radiation”. The most commonly used are, FP (Fabry Perot Laser), VCSEL (Vertical-Cavity Surface-Emitting Laser), DFB (Distributed Feedback Laser) also known as DML (Directly Modulated Lasers), and EML (Electro-absorption Modulated Lasers). They account for a large part of the cost of an optical transceiver and the laser used is directly linked to the transmission distance.ĭifferent designs of fiber optic laser are also available, which also have an influence on the cost of production as well as the types of application they can be used in. Fiber optic lasers are the core component of fiber optical transceivers which convert electrical data into optical signals for transmission over the fiber network. ![]()
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