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Optical fiber amplifier is one of the key instruments for modern optical communication systems. A rare-earth-doped optical fiber amplifier, in which optical gain is provided by stimulated emission from rare-earth elements, is the most widely used type of optical fiber amplifier. A schematic of a rar ...
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Light emission of semiconductor laser A semiconductor laser (LD) is a device that causes laser oscillation by flowing an electric current to semiconductor.The mechanism of light emission is the same as a light-emitting diode (LED). Light is generated by flowing the forward current to a p-n junction ...
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What is LED? LED is an abbreviation of Light Emission Diode, and is a device which emits light by flowing a current to the p-n junction like a semiconductor laser (LD). It emits various wavelength lights in the ultraviolet, visible and infrared regions, corresponding to its band gap energy. In parti ...
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Optical fibers are one of the most widely used form of optical waveguide. Unlike other form of waveguides, optical fibers can be manufactured long and bendable, and thus are primarily used for a transmission media for optical fiber communication. The history of optical fibers is believed to date bac ...
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SuperLuminescent Diode (SLD) is a semiconductor device to emit low-coherence light of a broad spectrum like LED (Light Emitting Diode), but high brightness like LD (Laser Diode). Light emitted in a narrow active layer similar to LD can be efficiently incident to the fiber. SLD is commonly used as in ...
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Fluoride fiber is multi-composite glass optical fiber composed of several heavy metal fluorides, and many different types of fluoride fibers exist depending on the material composition. Fluoride fibers have many unique characteristics that are not enabled by silica fiber, such as a wider operating w ...
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What is ASE light source? ASE light source is one type of optical light sources, where the emission is generated by Amplified Spontaneous Emission. An optical gain medium emits light spontaneously when it is optically/electrically pumped, and if the pumping of the gain medium is strong enough, the " ...
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Praseodymium-doped fiber amplifier (PDFA) is one type of rare-earth-doped fiber amplifiers, which operates in the O-band . The O-band is now widely used in data centers (high-speed Ethernet), metro network, and access networks (various PON systems), whose distances are typically less than a hundred ...
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Erbium-Doped Fiber Amplifier (EDFA) is an optical amplifier used in the C-band and L-band, where loss of telecom optical fibers becomes lowest in the entire optical telecommunication wavelength bands. Invented in 1987 , EDFA is now most commonly used to compensate the loss of an optical fiber in lon ...
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TDFA for S-band amplification A thulium-doped fiber amplifier (TDFA) is often used for light amplification in the Near Infra-Red (NIR). Figure 1 shows major transitions for NIR emission. This article describes a TDFA used for light amplification in 1.45-1.5 µm. Figure 1 Choice of host glass An impor ...
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