The Properties of Superluminescent Diodes (SLDs) - Inphenix

Inphenix Inc.16 Aug, 2023Other

Being a SLD current limiting device, its emitted optical power is proportional to the current. Unlike laser diodes, SLDs show a gradual increase in intensity with increasing current rather than a sharp increase. Residual spectral modulation, which is caused by non-zero reflections from SLD facets and characterizes parasitic Fabry-Perot modulation. The combination of laser-diode-like output power and brightness with a broad LED-like optical spectrum is what distinguishes superluminescent diodes. SLD shows high sensitivity in external optical feedback because it has extremely high optical gain in its active region.