1580nm DFB Butterfly Laser Diodes Manufacturers

Boxoptronics provide a wide selection of photodiodes (PD) with various active area sizes and packages.（China photodiodes)

ASE broadband light sources generate amplified spontaneous emission through rare-earth doped fibers (e.g., erbium-doped). Pumped by semiconductor lasers, excited ions emit photons, which are amplified to form a broad, flat spectrum (typically covering C-band 1530-1565nm and L-band 1565-1625nm) via gain-flattening filters.

ASE broadband light source works based on the principle of amplified spontaneous emission. When pump light is injected into doped optical fiber (such as erbium-doped optical fiber), the number of particles is inverted. Particles at high energy levels spontaneously transition back to low energy levels, releasing photons, which propagate in the optical fiber and induce more stimulated radiation, thereby achieving light amplification.

Fluorescence imaging has been widely used in biomedical imaging and clinical intraoperative navigation. When fluorescence propagates in biological media, absorption attenuation and scattering disturbance will cause fluorescence energy loss and signal-to-noise ratio decrease, respectively. Generally speaking, the degree of absorption loss determines whether we can "see", and the number of scattered photons determines whether we can "see clearly". In addition, the autofluorescence of some biomolecules and signal light are collected by the imaging system and eventually become the background of the image. Therefore, for biofluorescence imaging, scientists are trying to find a perfect imaging window with low photon absorption and sufficient light scattering.