Superluminescent diode (SLD) is an edge-emitting semiconductor light source. The unique property of an SLD is its high output power and low beam divergence, similar to an injection laser diode (LD), but with a broad emission spectrum and low coherence, similar to a light emitting diode (LED). SLDs are similar in geometry to lasers but have no built-in optical feedback mechanism required by LDs for stimulated emission to achieve lasing.

There are six key parameters used to characterize Superluminescent diodes (SLDs):

(1) Output Power

(2) Optical Gain

(3) ASE Spectrum Bandwidth or 3dB Bandwidth

(4) Spectrum Modulation or Ripple

(5) Coherence Length

(6) Coherence Function

Superluminescent diodes (SLDs) have been used for many different applications. The major application fields are:

(1) Optical Coherence Tomography

(2) White light interferometry

(3) Fiber-optic link testing

(4) WDM PON systems

(5) Fiber-optic sensors

(6) Fiber-optic gyroscopes

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