A bend-resistant multi-core optical fiber

Abstract

The invention relates to a bending-resistant multi-core optical fiber, comprising a common outer cladding and fiber cores arranged at intervals in the common outer cladding. , the core is composed of a core layer, an inner cladding layer and a depressed cladding layer from the inside to the outside, the radius R1 of the core layer is 3.4-4.2 μm, the relative refractive index difference Δ1 is 0.31-0.40%, and the radius of the inner cladding layer R2 is 5-9 μm, the relative relative refractive index difference Δ2 of the inner cladding is -0.05-0.05%, the radius R3 of the depressed cladding is 11-16 μm, the relative refractive index difference Δ3 of the depressed cladding is less than -0.5%, and the depressed cladding is enveloped The common outer cladding is a pure silica layer, the multi-core optical fiber has a low cut-off wavelength, good macrobending performance under small bending radius, and long service life. It can not only be used for cabling, but also can be used for The use of multi-core fibers extends to the field of devices.

Description

technical field [0001] The invention relates to an anti-bending multi-core optical fiber, which belongs to the technical field of optical communication transmission. Background technique [0002] In recent years, with the rise of cloud computing, big data, and the mobile Internet, data centers with efficient inter-server collaboration and data processing capabilities have become an obvious hotspot for the growth of total information and information density, which greatly affects the communication rate of data center interconnection. urgent demand for improvement. Due to the characteristics of a large number of devices, complex wiring, and high interface density in the data center interconnection communication, only relying on increasing the modulation bandwidth of the devices, increasing the number of optical fiber links or the number of output light sources with different stable wavelengths will inevitably increase the operation or maintenance of the system. Cost, power co...

AI Technical Summary

Problems solved by technology

However, in the field of devices, the length of multi-core fiber is usually at the centimeter level, and more attention is paid to the cut-off wavelength of the fiber. Since the cut-off wavelength of the optical cable is usually 50-150nm larger than the cut-off wavelength of the fiber, the multi-core fiber of the above design is used in the short-wavelength band of the device. Higher-order modes will be generated, and even cannot be used normally

[0006] At the same time, due to space constraints within the device, the bending radius of the fiber may be as low as 5mm

If the optical fiber design does not consider the bending loss performance of the optical fiber at a small bending radius, when these optical fibers are used in devices, the increase in optical fiber crosstalk will lead to an increase in the transmission bit error rate, and in severe cases will lead to communication failure, such as CN105026965A, CN103080797B The fiber bending radius given is 30mm, and the fiber bending radius given in the patent document CN103814312B is 15mm, which is obviously not suitable for use in devices

[0007] The fracture stress of the same optical fiber under different bending radii is very different, so the service life is very different. If the optical fiber is prepared without considering the service life of the optical fiber under the small bending radius, the long-term use of the optical fiber under the small bending radius will cause Optical fiber breakage seriously affects device life

At present, most of the multi-core optical fiber designs pay attention to the crosstalk of the optical fiber, and seldom pay attention to the life of the fiber. A few of the life of the fiber is also the life of the fiber under a large bending radius. Below ×10-7, but not mentioning the life of the optical fiber at a bending radius of 5mm

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