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Single-mode fiber optic cable Multi-mode fiber can use a step index distribution, or a graded index distribution

Single-mode fiber optic cable Multi-mode fiber can use a step index distribution, or a graded index distribution

The propagation of electromagnetic waves in the optical fiber belongs to the medium circular waveguide. When the light is totally reflected at the interface of the medium, the electromagnetic wave is confined in the medium, which is called guided wave or guided mode. For a given guided wave and operating wavelength, there are multiple incident situations that satisfy the condition of total reflection, which are called different modes of the guided wave. According to the transmission mode, it is divided into multi-mode fiber and single-mode fiber. Multimode fiber can transmit several modes, while single mode fiber can only transmit one mode for a given operating wavelength.
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The number of transmission modes in the fiber is classified, and the fiber can be divided into multi-mode fiber and single-mode fiber

The number of transmission modes in the fiber is classified, and the fiber can be divided into multi-mode fiber and single-mode fiber

The propagation of electromagnetic waves in the optical fiber belongs to the medium circular waveguide. When the light is totally reflected at the interface of the medium, the electromagnetic wave is confined in the medium, which is called guided wave or guided mode. For a given guided wave and operating wavelength, there are multiple incident situations that satisfy the condition of total reflection, which are called different modes of the guided wave. According to the transmission mode, it is divided into multi-mode fiber and single-mode fiber. Multimode fiber can transmit several modes, while single mode fiber can only transmit one mode for a given operating wavelength.
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The meaning of the cut-off wavelength λc is the Z-small working light wavelength that enables the optical fiber to achieve single-mode transmission.

The meaning of the cut-off wavelength λc is the Z-small working light wavelength that enables the optical fiber to achieve single-mode transmission.

The propagation of electromagnetic waves in the optical fiber belongs to the medium circular waveguide. When the light is totally reflected at the interface of the medium, the electromagnetic wave is confined in the medium, which is called guided wave or guided mode. For a given guided wave and operating wavelength, there are multiple incident situations that satisfy the condition of total reflection, which are called different modes of the guided wave. According to the transmission mode, it is divided into multi-mode fiber and single-mode fiber. Multimode fiber can transmit several modes, while single mode fiber can only transmit one mode for a given operating wavelength.
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