Direct Modulated Laser diode (DML) can be used to modulate optical power. In DML, the laser output power is adjusted by changing the pump current in the laser gain medium. The pump current is controlled by an electrical drive signal. This type of direct detection (DD) system typically uses On-Off Keying (OOK). In other words, the pump current of the DML is changed through bina...

In today‘s era of rapid development of laser technology, solid-state lasers and fiber lasers, as the two major mainstream laser products, have each demonstrated their unique charm and advantages in many fields such as industrial production, scientific research, and military applications.

An electro-optic modulator (EOM) is a device that controls the power, phase or polarization of an optical signal through an electrical signal. Its core principle is based on the linear electro-optic effect (Pockels effect). This effect manifests itself in that the applied electric field is proportional to the refractive index change of the nonlinear crystal, thereby achieving e...

Directly generating visible light from compact all-fiber lasers while maintaining high output characteristics has always been a research topic in laser technology. Here, Ji et al. proposed a method to develop dual-wavelength lasers using the excitation mechanism in holmium-doped ZBLAN fluoride glass fibers, and experimentally achieved high output performance of all-fiber lasers...

Halbleiterlaserchip Ein Laserdiodenchip ist ein halbleiterbasierter Laser, der aus einer P-N-Struktur besteht und mit Strom versorgt wird. Das Laserdiodenpaket ist ein komplettes Gerät, das zusammengebaut und in einem versiegelten Gehäuse verpackt ist, um einen Halbleiterlaserchip zu bilden, der kohärentes Licht aussendet, einen Überwachungs-Fotodiodenchip zur Rückkopplungsste...

The polarization characteristics of light are a description of the vibration direction of the electric field vector of light.

For polarization-maintaining (PM) optical fiber, assuming that the polarization direction of the input linearly polarized light is in the middle of the fast axis and the slow axis, it can be decomposed into two orthogonal polarization components. As shown in the figure below, the two light waves initially have the same phase, but because the refractive index of the slow axis is...

ASE broadband light generated by erbium-doped fiber is amplified spontaneous emission light generated by short-wavelength laser pumping erbium-doped fiber. As shown in the following diagram, the pumped rare earth ions transition between upper and lower energy levels to generate spontaneous emission light, which is amplified in the stimulated emission process. This process is re...