• Detailed explanation of ASE light source polarization degree DOP and polarization extinction ratio PER
    Detailed explanation of ASE light source polarization degree DOP and polarizatio...
    The polarization characteristics of light are a description of the vibration direction of the electric field vector of light.
    2024-11-14
  • What is the beat length of optical fiber?
    What is the beat length of optical fiber?
    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...
    2024-10-31
  • Working principle of ASE broadband light source
    Working principle of ASE broadband light source
    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...
    2024-10-23
  • Blue light semiconductor laser structure and working principle
    Blue light semiconductor laser structure and working principle
    Depending on the active region material, the band gap width of the semiconductor material of the blue light semiconductor laser varies, so the semiconductor laser can emit light of different colors.
    2024-09-28
  • What factors will reduce the output extinction ratio of PM fiber?
    What factors will reduce the output extinction ratio of PM fiber?
    For panda and bowtie PM fibers, due to non-ideal coupling conditions, external stress on the fiber, and defects in the fiber, the polarization direction of part of the light will shift to the orthogonal direction, reducing the output extinction ratio.
    2024-09-09
  • What is Optical Coherence Tomography (OCT)
    What is Optical Coherence Tomography (OCT)
    Optical coherence tomography is a low-loss, high-resolution, non-invasive medical imaging technology developed in the early 1990s. It combines optical technology with ultrasensitive detectors. Using modern computer image processing, OCT fills the gap in resolution and imaging depth between microscopes and ultrasound imaging. The imaging resolution of OCT is about 10~15 μm, whic...
    2024-08-26
  • What is a fiber laser?
    What is a fiber laser?
    Definition: A laser that uses a doped fiber as a gain medium, or a laser whose laser resonator is mostly composed of fiber.
    2024-07-20
  •  What is a grating coupler?
    What is a grating coupler?
    The grating coupler uses grating technology to couple optical signals into optical fibers, and uses the principle of grating diffraction to connect the transmitted optical signals with the optical field inside the optical fiber.
    2024-07-03