Ultra-long distance non-relay optical transmission has always been a research hotspot in the field of optical fiber communication. The exploration of new optical amplification technology is a key scientific issue to further extend the distance of non-relay optical transmission.
Randomly distributed feedback fiber laser based on Raman gain, its output spectrum has been confirmed to be wide and stable under different environmental conditions, and the lasing spectrum position and bandwidth of the half-open cavity DFB-RFL is the same as the added point feedback device The spectra are highly correlated. If the spectral characteristics of the point mirror (such as FBG) change with the external environment, the lasing spectrum of the fiber random laser will also change. Based on this principle, fiber random lasers can be used to realize ultra-long-distance point-sensing functions.
Lithography is a technique for transferring a designed pattern directly or through an intermediate medium onto a flat surface, excluding areas of the surface that do not require a pattern.
Compared with discrete optical fiber amplification technology, Distributed Raman Amplification (DRA) technology has shown obvious advantages in many aspects such as noise figure, nonlinear damage, gain bandwidth, etc., and has gained advantages in the field of optical fiber communication and sensing. widely used. High-order DRA can make the gain deep into the link to achieve quasi-lossless optical transmission (that is, the best balance of optical signal-to-noise ratio and nonlinear damage), and significantly improve the overall balance of optical fiber transmission/sensing. Compared with conventional high-end DRA, DRA based on ultra-long fiber laser simplifies the system structure, and has the advantage of gain clamp production, showing strong application potential. However, this amplification method still faces bottlenecks that restrict its application to long-distance optical fiber transmission/sensing
High power ultrafast lasers are widely used because of their short pulse duration and peak power.Ultrafast lasers are used in material processing applications, medical fiber lasers, microscopy and other fields.
The full name of VCESL is a vertical cavity surface emitting laser, which is a semiconductor laser structure in which an optical resonant cavity is formed in the direction perpendicular to the semiconductor epitaxial wafer and the laser beam emitted is perpendicular to the surface of the substrate. Compared with LEDs and edge-emitting lasers EEL, VCSELs are superior in terms of accuracy, miniaturization, low power consumption, and reliability.
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