The transmission distance of the optical module refers to the distance over which the optical signal can be directly transmitted without relay amplification. It is divided into three types: short-distance, medium-distance, and long-distance. Generally speaking, 2km and below are short distances, 10-20km are medium distances, and 30km, 40km and above are long distances. Optical ...

Fiber laser is gradually replacing the traditional laser in laser marking, laser welding, laser cutting and other fields. Application of Fiber Laser Marker in Industry

In the optical fiber communication network, the most commonly used laser is the distributed feedback (DFB) laser, which is a single longitudinal mode or single frequency semiconductor laser. The single frequency laser refers to a laser with only one longitudinal mode (spectral line) spectrum characteristic of the semiconductor laser. It can work in the third generation optical ...

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...

As an important part of optical fiber communication system, optical module plays the role of photoelectric conversion. This article will introduce the core devices of the optical module.

When the transmission interval is too long (more than 100 km), the optical signal will have a great loss. In the past, people generally used optical repeaters to expand the optical signal. This kind of equipment has certain limitations in practical use, and it has been gradually Instead of optical fiber amplifiers, the working principle of optical fiber amplifiers is shown in t...

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...

Laser distance measuring is measured using a laser as a light source.It is divided into continuous laser and pulse laser according to the mode of laser operation.Gas lasers like helium-neon, argon ion, krypton cadmium and so on work in a continuous output state for phase laser ranging, dual heterogeneous GaAs semiconductor laser for infrared ranging; solid laser such as ruby, n...