Optical fiber for wavelegnth division multiplexing communications

Abstract

An optical fiber for wavelength division multiplexing (WDM) communication, which includes: an inner core located on the central axis of the optical fiber with a specific radius and a refractive index; an outer core formed on the outside of the inner core with a specific radius, which The refractive index decreases linearly from its inside to outside; a cladding with a specific radius is formed on the outside of the outer core. The optical waveguide can be optimized by controlling the refractive index of the optical waveguide in the wavelength band with the desired dispersion.

Description

technical field [0001] The present invention relates to an optical fiber for wavelength division multiplexing (WDM) communication, and more particularly to an optical fiber having a cross-section that optimizes dispersion within a specific wavelength band by adjusting the refractive index of an optical waveguide. Background technique [0002] Generally speaking, wavelength division multiplexing communication refers to a communication method that transmits multiple optical signals with different wavelengths in an optical fiber, which can make full use of the low-loss characteristics of optical fibers in a wide band. Therefore, the application of wavelength division multiplexing in communication technology is more and more extensive at present. [0003] It is now known that the most commonly used optical fiber in the above-mentioned wavelength division multiplexing communication must have a wide communication area to transmit signals in the 1550nm band. According to the perfo...

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Problems solved by technology

However, in this case, due to nonlinear effects such as four-wave mixing, the single-mode fiber for this WDM communication is limited to multi-channel transmission because the wavelength band of the fiber is different from the gain wavelength range of the erbium-doped fiber. etc., which makes multi-channel transmission more difficult

In addition, since the zero dispersion wavelength of the fiber is set to 1550nm; the dispersion tendency is inconsistent with the gain wavelength of the erbium-doped fiber

As mentioned above, the limitation of this type of fiber with zero dispersion wavelength is that even a small change in dispersion propensity can cause a significant degradation in transmission quality

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