TeraXion's PureSpectrum NLL series utilizes a technology that combines a phase-shifted fiber Bragg grating filter with a highly stable driver circuit. Its core principle is to monitor the laser frequency in real time using an optical discriminator.
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.
1st-order Raman spectroscopy utilizes stimulated Raman scattering in silica optical fibers. 140 nm pump light directly amplifies C-band signal light (1530-1565 nm). The pump light vibrates and scatters in the fiber, transferring energy to the frequency of the signal light.
Fiber-optic Gyroscopes: The low coherence of ASE light sources can suppress nonlinear effects, improving the accuracy and stability of inertial navigation systems. Wavelength Division Multiplexing (WDM) Device Testing: Broadband light sources cover multiple communication bands, supporting simultaneous testing of multi-channel insertion loss, isolation, and OSNR (Optical Signal-to-Noise Ratio).
In the field of optical communications, long-distance transmission has long been challenged by issues such as signal attenuation and distortion. Raman fiber amplifiers, with their unique advantages, have become a key technology for improving the performance of long-distance optical communication systems.
International media recently reported that scientists at the Harvard John A. K. Howe School of Engineering and Applied Sciences, in collaboration with the Technical University of Vienna, have developed a new semiconductor laser. This laser utilizes a simple crystal design and enables efficient, reliable, and versatile wavelength transmission.
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