Lasers produce precisely controlled optical radiation through atomic energy-level transitions, which excite bound electrons to emit directional, well-regulated light. The outgoing beam is coherent electromagnetic radiation, with all light waves sharing identical frequency and perfectly aligned phase. Broadly speaking, lasers operate in two fundamental modes: continuous steady emission and intermittent pulsed emission. This article details the essential differences between continuous-wave (CW) and pulsed lasers, along with quasi-continuous-wave (QCW) variants.
In modern optical fiber communication systems, Erbium-Doped Fiber Amplifiers (EDFAs) are core devices that enable direct optical signal amplification to support long-haul and high-capacity transmission.
In the development of narrow linewidth lasers to the present day, the evolution of laser feedback mechanisms has been synonymous with the evolution of laser resonator structures. Below, various configurations of narrow linewidth laser technologies are introduced in the order of the evolution of laser resonators.
A fiber optic splitter, also known as an optical splitter, is a passive optical device used in FTTH (Fiber to the Home) systems to split a single optical fiber signal into two or more output optical signals according to a predetermined ratio.
With the explosive growth in AI computing power demand, ultra- high- speed optical modules such as 800G and 1.6T have become core equipment for data center interconnection and cloud network construction. LAN- WDM DFB fiber- coupled lasers, as the core light source at the module's transmitter end, are perfectly compatible with high-speed optical modules such as 800G/1.6T/400G due to their multi- wavelength characteristics and high linearity.
In cutting-edge optoelectronic fields such as optical communication, lidar, and photonic integration, semiconductor optical amplifiers (SOAs) serve as core devices for optical signal enhancement. Boasting advantages of small size, low cost, easy integration, and fast response speed, they are gradually replacing traditional optical amplification solutions and have become a key component supporting the development of high-speed optical networks and high-power optical systems. This article will analyze the working principles and full-scenario applications of SOAs in detail, and focus on discussing the technical characteristics, design challenges, and application value of high-power SOAs, helping to fully understand the core advantages of this "optical signal booster."
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