Few-mode optical fiber and preparation method

Abstract

The embodiment of the invention discloses a few-mode optical fiber and a preparation method. The few-mode optical fiber comprises an inner core, a ring core surrounding the inner core, a wrapping layer wrapping the ring core, and a coating layer wrapping the wrapping layer. A refractive index of the ring core is greater than that of the wrapping layer; the refractive index of the wrapping layer isgreater than that of the inner core; the refractive index of the inner core is determined based on a change rule of an effective refractive index difference between the vector modes along with the refractive index of the inner core; and a radius of the inner core is determined based on the change rule of the effective refractive index difference between the vector modes along with the radius of the inner core. According to the technical scheme provided by the embodiment of the invention, the structure is simple, a stable low-order vector mode can be effectively generated, and a defect of highcrosstalk of a common few-mode optical fiber vector mode can be overcome.

Description

technical field [0001] Embodiments of the present invention relate to optical fiber technology, and in particular to a few-mode optical fiber and a preparation method. Background technique [0002] In recent years, the regulation of polarization modes in optical fibers has become one of the research hotspots. Using different polarization modes to transmit optical signals is beneficial to further expand the channel capacity of optical fibers. [0003] However, the modal dispersion of traditional optical fibers will lead to broadening of the optical pulse. When the dispersion is severe, the optical pulses will overlap back and forth, and crosstalk between modes will cause distortion of the transmission signal waveform. Design a new type of optical fiber structure, so that the effective refractive index difference Δn between the modes of the optical fiber eff Greater than the low crosstalk standard value of 10 -4 , is one of the effective ways to solve this problem. Content...

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Problems solved by technology

[0003]However, the modal dispersion of traditional optical fibers will lead to broadening of the optical pulse. When the dispersion is severe, the optical pulses will overlap back and forth, and crosstalk between modes will cause distortion of the transmission signal waveform.

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