Superluminescent Diode: Properties, Features and Working

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A superluminescent diode (SLD) is a semiconductor light-emitting device that emits light over a wide range of wavelengths. They are typically used in optical fiber communication systems as broadband light sources. 

SLDs are made of semiconductor materials such as gallium arsenide and aluminum gallium arsenide. The active region of an SLD typically contains one or more quantum wells. In operation, electrons and holes are injected into the quantum well where they recombine and emit light. 

The wavelength of the light emitted by an SLD is determined by the size of the quantum well. SLDs can be fabricated to emit light over a wide range of wavelengths from the visible to the infrared.

Superluminescent Diode: Properties, Features and Working

SLDs typically have a very broad emission spectrum with a full width at half maximum (FWHM) of 20-40 nm. This makes them ideal for use as broadband light sources in optical fiber communication systems. 

Superluminescent diodes are also very efficient light sources. They have a quantum efficiency of up to 90% which means that almost all of the injected electrons and holes are recombined and emit photons. 

SLDs are typically operated in continuous-wave (CW) mode. However, they can also be used in pulsed mode for applications such as time-resolved spectroscopy and laser addressable sensing. It is a very stable light sources. They have a low noise figure and a long-lifetime. SLDs can typically be operated for more than 10,000 hours without significant degradation. 

If you want to know the Properties, Features and Working of Superluminescent Diode, check our blog.

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