Quartz glass tube for optical fiber type device

Abstract

The utility model discloses a porous quartz glass tube for an optical fiber type device, the structure of the quartz glass tube comprises a quartz glass tube wall structure and a plurality of optical fiber positioning grooves, the cross sections of the optical fiber positioning grooves are arc-shaped, and every two optical fiber positioning grooves are tangent to each other. The quartz glass tube provided by the utility model has the capability of neatly arranging optical fibers when a fan-in and fan-out device or a photon lantern is prepared, has the advantage that the prepared device has relatively strong rigidity and is convenient to cut and weld, and is simple in structure, easy to implement and convenient for large-scale production.

Description

Technical Field

[0001] The invention relates to a four-hole quartz glass tube used for optical fiber type devices in the field of optical fiber communication, and in particular to a design method of the quartz glass tube. Background Art

[0002] For ease of understanding, the professional terms involved in the present invention are as follows:

[0003] SMF: Single Mode Fiber.

[0004] MCF: Multicore Fiber.

[0005] FMF: Few Mode Fiber

[0006] MDM: Mode Division Multiplexing.

[0007] QAM: Quadrature Amplitude Modulation.

[0008] QPSK: Quadrature Phase Shift Keying.

[0009] MIMO: Multiple-Input Multiple-Output.

[0010] FIFO: Fan in / Fan out.

[0011] Shannon limit: The Shannon limit or Shannon capacity of a communication channel is the theoretical maximum information transmission rate of a channel for a specific noise level. The famous Shannon theorem is given by the formula: C = B × log2 (1 + S / N), where C is the available link speed (channel capacity), B is the bandwidth of the link, S is the average signal power, N is the average noise power, and the signal-to-noise ratio (S / N) is usually expressed in decibels (dB), decibel number = 10 × lg (S / N).

[0012] From the perspective of the development trend of optical fiber communication capacity, based on the currently widely used wavelength division multiplexing (WDM) and various advanced modulation technologies (QAM, QPSK, etc.), the existing optical fiber communication system has approached and will soon reach the Shannon limit of the standard single-mode fiber (SMF) transmission capacity. The low-frequency band used by 5G (fifth generation mobile communication) mainly uses multiple-input and multiple-output technology (MIMO) and non-orthogonal multiplexing technology (NOMA) to increase the capacity of the channel. In the 6G stage, since 5G technology has approached the "Shannon limit", it will adopt the method of increasing the channel bandwidth, and the core of the channel bandwidth lies in the "information-carrying medium-optical fiber material". The data transmitted by 5G has exploded, and 6G faces many new transmission problems. How to break through the bottleneck of transmission capacity is imminent.

[0013] Multi-core fiber is a special type of optical fiber. Unlike traditional single-core fiber, it contains multiple cores in one cladding. Each core is an independent transmission channel that can transmit independent optical signals. Multi-core fiber can transmit multiple signals at the same time, which greatly enhances the transmission capacity of optical fiber. Traditional single-core fiber has some limitations in long-distance transmission because optical signals will encounter problems such as signal attenuation and dispersion during transmission. Multi-core fiber overcomes these limitations by using multiple independent optical cores in the same optical fiber.

[0014] Greatly increase the transmission capacity. High network flexibility: can be used to build a more flexible optical communication network, supporting more connection methods and topologies. Save space and cost: compared with using multiple single-core optical fibers, multi-core optical fibers can achieve multiple channel transmission in the same optical fiber, thus saving space and optical fiber laying costs.

[0015] Multi-core fiber fan-in and fan-out are specially used for the optical input and output of each core of a multi-core optical fiber, called fan-in or fan-out. Fan-out devices are usually drawn in pairs, and both insertion loss and return loss are tested in pairs. They are then cut and processed according to the length, sleeve type, and connector type required by the user. One end of the fan-out device is a multi-core optical fiber, and the other end is a single-mode optical fiber. It can be customized according to the type of multi-core optical fiber used by the user, and the number of cores can support 2 to 22.

[0016] The applications of multi-core optical fiber include high-capacity data transmission, data center interconnection, distributed sensing and optical networks. With the continuous development of communication technology, multi-core optical fiber is expected to play an increasingly important role in the future optical communication field.

[0017] Few-mode fiber is a fiber with fewer propagation modes. Few-mode fiber allows several different propagation modes to exist, which gives it some unique performance advantages. Among them, the most common few-mode fiber propagation modes include the fundamental propagation mode (LP01 ), the first higher-order propagation mode (LP 11 ), etc. Due to its lower dispersion, higher frequency tolerance and larger bandwidth, it has potential advantages in high-capacity optical communication systems. In addition, it can also be applied to some scenarios that require complex manipulation and modulation of optical signals.

[0018] The realization of the photon lantern is based on the mode multiplexing technology of few-mode fiber, which uses several independent orthogonal modes in few-mode fiber as independent channels to multiply the communication capacity of the fiber. In addition, compared with single-mode fiber, few-mode fiber has a larger mode field area, so the tolerance of nonlinear effects will also be relatively improved. This not only increases the transmission capacity, but also increases the Shannon limit, thereby greatly improving the communication capacity of the entire optical fiber communication system.

[0019] To this end, scientists have carried out a lot of research.

[0020] Chinese patent CN113866882A proposes a seven-core fan-in and fan-out device, which can achieve seven-way fan-in and fan-out through a fused taper method. However, the perforated quartz glass tube structure used requires a large taper ratio after the core spacing is drawn to match the multi-core optical fiber, which will produce large taper losses.

[0021] Chinese patent CN115542462A proposes a fan-in fan-out device, which is prepared by chemically etching the optical fiber cladding and then combining it with a quartz glass tube. However, it is difficult to achieve precise alignment of the cores when docking with a multi-core optical fiber using an ordinary quartz glass tube.

[0022] U.S. Patent US202217648473A proposes a four-core fan-in fan-out device, which uses an auxiliary unit to restrain and position the optical fiber when equipping the optical fiber to a quartz glass tube. However, the process is difficult and the rigidity of the device is not enhanced to obtain better reliability and cuttability. Summary of the invention

[0023] In summary, the existing reported invention patents cannot well solve the technical demand for space division multiplexing devices in the field of large-capacity space division multiplexing optical fiber communication systems. The present invention proposes a four-hole quartz glass tube for optical fiber type devices to solve the major demand for the practical application of mode multiplexing technology in the next generation optical fiber communication system. The purpose of the present invention is to solve the problem of the difficulty of obtaining a regular arrangement of optical fibers when preparing multi-core optical fiber fan-in fan-out devices or photon lanterns, and to reduce the difficulty of cutting and welding the prepared devices.

[0024] The invention provides a quartz glass tube for optical fiber type devices. The quartz glass tube consists of a quartz glass tube wall structure and a plurality of optical fiber positioning grooves.

[0025] A plurality of optical fiber positioning grooves are evenly distributed on the inner wall surface of the glass tube.

[0026] 8. The cross section of the optical fiber positioning groove is arc-shaped and tangent to each other. There are four optical fiber positioning grooves in total. The diameter of the optical fiber positioning groove of the quartz glass tube is dμm, d∈[40,240]; the duty cycle of the quartz glass tube is b, b∈[0.6,0.8]; the outer diameter of the quartz glass tube is Dμm, The inner diameter of the quartz glass tube is L2 μm.

[0027] Compared with the prior art, the advantages of the present invention are as follows:

[0028] (1) The present invention has the ability to arrange optical fibers in a regular pattern when preparing fan-in fan-out devices or photonic lanterns.

[0029] (2) The present invention has the advantage that the manufactured device has strong rigidity and is easy to cut and weld.

[0030] (3) The present invention has the advantages of simple structure, easy implementation and convenient large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0033] Figure 1 It is the cross section of the quartz glass tube of Example 1 of the present invention. The quartz glass tube is used to prepare a multi-core optical fiber fan-in and fan-out device or a photon lantern of an optical fiber with a cladding diameter of 40 μm after etching.

[0034] Figure 2 It is the cross section of the quartz glass tube of Example 2 of the present invention. The quartz glass tube is used to prepare a multi-core fiber fan-in and fan-out device or a photon lantern of an optical fiber with a cladding diameter of 80 μm.

[0035] Figure 3It is the cross section of the quartz glass tube of Example 3 of the present invention. The quartz glass tube is used to realize the preparation of a multi-core fiber fan-in and fan-out device or a photon lantern of an optical fiber with a cladding diameter of 125 μm.

[0036] Figure 4 This is a dimension definition diagram for glass tubes.

[0037] Figure 5 is the cross section of the glass tube of Example 4. DETAILED DESCRIPTION

[0038] See attached Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a four-hole quartz glass tube for optical fiber type devices, the quartz glass tube includes a quartz glass tube wall structure and four optical fiber positioning grooves. The characteristics are: the diameter of the optical fiber positioning groove of the quartz glass tube is dμm, d∈[40,240]; the duty cycle of the quartz glass tube is b, b∈[0.6,0.8]; the outer diameter of the quartz glass tube is Dμm, The inner diameter of the quartz glass tube is L1 μm. The inner diameter of the quartz glass tube is L2 μm. The quartz glass tube has the ability to arrange optical fibers regularly when preparing fan-in and fan-out devices or photon lanterns, and has the advantage of making the prepared devices have strong rigidity for easy cutting and welding. It has a simple structure, is easy to implement, and is convenient for large-scale production.

[0039] Embodiment 1:

[0040] The present invention provides a four-hole quartz glass tube for optical fiber type devices, the quartz glass tube comprises a quartz glass tube wall structure and four optical fiber positioning grooves. The diameter of the optical fiber positioning groove of the quartz glass tube is 40 μm; the duty ratio of the quartz glass tube is 0.6; the outer diameter of the quartz glass tube is 137.96 μm; the inner diameter major axis of the quartz glass tube is 96.57 μm; and the inner diameter minor axis of the quartz glass tube is 60 μm.

[0041] Embodiment 2:

[0042] The present invention provides a four-hole quartz glass tube for optical fiber type devices, the quartz glass tube comprises a quartz glass tube wall structure and four optical fiber positioning grooves. The diameter of the optical fiber positioning groove of the quartz glass tube is 80 μm; the duty ratio of the quartz glass tube is 0.7; the outer diameter of the quartz glass tube is 275.91 μm; the inner diameter major axis of the quartz glass tube is 193.14 μm; and the inner diameter minor axis of the quartz glass tube is 100 μm.

[0043] Embodiment three:

[0044] The present invention provides a four-hole quartz glass tube for optical fiber type devices, the quartz glass tube comprises a quartz glass tube wall structure and four optical fiber positioning grooves. The diameter of the optical fiber positioning groove of the quartz glass tube is 125 μm; the duty ratio of the quartz glass tube is 0.8; the outer diameter of the quartz glass tube is 431.11 μm; the inner diameter major axis of the quartz glass tube is 301.78 μm; and the inner diameter minor axis of the quartz glass tube is 150 μm.

[0045] The main performance indicators of the quartz glass tube of the above implementation example are shown in Table 1.

[0046] Table 1 Main structural parameters of the quartz glass tube of the implementation example

[0047]

[0048] Embodiment 4:

[0049] A three-hole quartz glass tube for optical fiber type device is provided. The quartz glass tube comprises a quartz glass tube wall structure and three optical fiber positioning grooves. The cross sections of the three optical fiber positioning grooves are circular and tangent to each other. To prevent the tangent parts from breaking, the tangent parts of the positioning grooves are cut off a little.

[0050] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the universal principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

[0052] The above description is only a preferred example of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A quartz glass tube for optical fiber type devices, characterized in that: A plurality of optical fiber positioning grooves are evenly distributed on the inner wall surface of the glass tube, and the cross sections of the optical fiber positioning grooves are arc-shaped and tangent to each other.

2. The quartz glass tube for optical fiber type devices according to claim 1, characterized in that: There are four fiber optic positioning slots.

3. A quartz glass tube for optical fiber type devices according to claim 2, characterized in that : The diameter of the optical fiber positioning groove in the quartz glass tube is d μm, dϵ[40,240].

4. A quartz glass tube for optical fiber type devices according to claim 2, characterized in that : The duty cycle of the quartz glass tube is b, b ϵ[0.6,0.8].

5. A quartz glass tube for optical fiber type devices according to claim 3, characterized in that : The outer diameter of the quartz glass tube is D μm, .

6. A quartz glass tube for optical fiber type devices according to claim 3, characterized in that : The inner diameter of the quartz glass tube is L2μm, L2ϵ[d, ].

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