Different 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.

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As the name suggests the VCEL emits the laser beam perpendicular to the surface of the semiconductor wafer. This gives it some advantages over edge-emitting lasers during the production process which reduces the fabrication costs whilst ensuring quality. 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. In addition, their design means that thousands of VCELs can be processed simultaneously.

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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.

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Fiber optic lasers are the core component of fiber optical transceivers which convert electrical data into optical signals for transmission over the fiber network.

They account for a large part of the cost of an optical transceiver and the laser used is directly linked to the transmission distance.

Directly Modulated Lasers (DML), also known as Distributed Feedback (DFB) lasers because of how they are constructed, consist of a single chip making them suitable for transceiver designs requiring a small footprint and low power consumption. The DFB passes only specific wavelengths (1310nm and 1550nm) through a grating, transmitting at distances below 40 km.

To find out more about optical transceivers, including information on the type of fiber optic laser used, take a look at the Pro Optix Customer Portal >

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Laseroptics Physics

Laser is an acronym for “Light Amplification by Stimulated Emission of Radiation”. 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. 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. The photons (light particles) are then reflected through the optical resonator which creates the output laser beam.

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. Edge-emitting lasers were the first semiconductor lasers and are still in use today.

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Our comprehensive portfolio of fiber optical networking solutions enables us to offer our customers a solution tailored to their specific network demands.

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To reduce installation time and the cost of labor in data centers and IT networks, custom-made lengths and configurations of fiber optic cabling are available, either with connectors or transceivers already connected at the factory.

Download the Fiber Optical Transceivers Introduction Guide for key technical facts and features to help you select the right transceiver for your application.

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The EML design integrates a laser diode with an electro-absorption modulator (EAM) on a single chip, and features lower chromatic dispersion, so it is better suited to higher data rate transmission over longer distances.

Example fiber optical transceivers: 400G QSFP-DD FR4, 2 km, 1271-1331 nm, DDM, LC Duplex, Singlemode > 10G SFP+ CWDM ER, 40 km, 1450 nm, DDM, LC Duplex, Singlemode >

Example fiber optical transceivers: 200G QSFP56 FR4, 2 km, 1271-1331 nm, DDM, LC Duplex, Singlemode > 100M SFP CWDM EX, 40 km, 1430 nm, DDM, LC Duplex, Singlemode >

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Download the MPO/MTP Introduction Guide which covers key technical facts and features to help you select and install MPO/MTP solutions.

Optical transceivers often come with a string of acronyms that might seem unclear at first glance. This guide breaks down the most commonly used standards to help simplify your selection process.

Download the WDM Introduction Guide which covers WDM technical basics, WDM transceivers, MUX and DEMUX, CWDM and DWDM, laser and range.

Fabry Perot (FP) lasers transmit at specific wavelengths (1310nm and 1550nm) and are suitable for transmission distances below 40km. They have a high modulation rate and large output power, however, the smaller divergence angle and narrow spectrum of the FP lasers mean that thate are not able to be used for Wavelength Division Multiplexing (WDM).

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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).

DML/DFB is generally used for lower data rate applications over shorter distances than EML up to around 10km (although 100M data rates are available for up to 40km). EML can handle longer distances at higher data rates.

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Example fiber optical transceivers: 400G QSFP-DD SR8, 100 m, 850 nm, DDM, MPO, Multimode > 100M SFP FX, 2 km, 850 nm, DDM, LC Duplex, Multimode >

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We take a deeper look at the different types of fiber optic cables along with the different types of connectors, terminations and jackets.