Preparation method of two-in two-out multi-pole symmetrical winding optical fiber ring and two-in two-out multi-pole symmetrical optical fiber ring

Abstract

The invention discloses a preparation method of a two-in and two-out multi-pole symmetrical winding optical fiber ring and the two-in and two-out multi-pole symmetrical optical fiber ring, which are characterized in that the optical fiber ring comprises two channels, and a two-in and two-out symmetrical winding method higher than eight poles is adopted. According to the invention, the product has two groups of completely symmetrical optical fiber rings, has more advantages in symmetry compared with the traditional quadrupole winding method, can work separately, and can better overcome the phase nonreciprocity phenomenon of the optical fiber rings in the environment change state of resisting temperature change, vibration and the like so as to obtain better performance.

Description

Technical Field

[0001] The invention relates to the technical field of fiber optic gyroscope manufacturing, in particular to a preparation method of a two-input and two-output multipolar symmetrically wound optical fiber ring and the two-input and two-output multipolar symmetrical optical fiber ring. Background Art

[0002] Fiber optic gyroscopes (FOGs) are instruments that can accurately determine the orientation of moving objects. They are widely used as inertial navigation sensors in modern aviation, navigation, aerospace, and other defense industries. The fiber optic ring is the core component of the FOG, and its winding requires uniform fiber tension and high symmetry.

[0003] Currently, the most common method used for fiber optic ring winding in China is quadrupole symmetry. While this method offers good symmetry, it is still insufficient for demanding applications in terms of resistance to environmental changes such as temperature and vibration. In particular, temperature gradients can cause phase non-reciprocity in the fiber optic ring, making it difficult to meet the specific requirements of customers for high-end fiber optic gyroscope technology in some applications. Winding with octopole or more offers better symmetry than quadrupole winding. Furthermore, fiber optic rings created using dual-channel multipole symmetric winding can generate differential signals from the gyroscope's rotation, offsetting external noise interference and offering superior resistance to temperature and vibration. Summary of the Invention

[0004] The present invention provides a two-input and two-output multi-pole symmetrical winding method to solve the problem that the existing winding method cannot meet the customer's technical requirements for higher performance of the fiber optic gyroscope.

[0005] To achieve the above-mentioned object, the present invention provides a two-input, two-output multi-pole symmetrical winding method, characterized in that the number of winding poles reaches eight or more. The two-input, two-output, eight-pole symmetrical winding method includes the following steps:

[0006] S10: First, mark the two optical fibers to be wound. Fiber 1 is marked as 1A and 1B, and fiber 2 is marked as 2A and 2B. A and B are of equal length.

[0007] S20: Place optical fiber 1A, optical fiber 1B, optical fiber 2A, and optical fiber 2B onto a ring winding machine;

[0008] S30: Winding the optical fiber 1A in the first layer by arranging the optical fibers from left to right;

[0009] S40: Winding the optical fiber 2A in the second layer by arranging the optical fibers from left to right;

[0010] S50: The optical fiber 1B is wound in the third layer by arranging the optical fibers from left to right.

[0011] S60: The optical fiber 2B is wound on the fourth layer by arranging the optical fibers from left to right.

[0012] S70: Winding the optical fiber 1B on the fifth layer by arranging the optical fibers from right to left.

[0013] S80: Complete the winding of optical fiber 2B in the sixth layer by arranging the optical fibers from right to left.

[0014] S90: Complete the winding of optical fiber 1A on the 7th layer by arranging the optical fibers from right to left;

[0015] S100: Winding the optical fiber 2A in the eighth layer by arranging the optical fibers from right to left;

[0016] S110: Complete the winding of optical fiber 1B by arranging the optical fibers from left to right on the ninth layer;

[0017] S120: Complete the winding of optical fiber 2B by arranging the optical fibers from left to right on the 10th layer;

[0018] S130: Winding the optical fiber 1A in the 11th layer by arranging the optical fibers from left to right;

[0019] S140: Winding the optical fiber 2A in the 12th layer by arranging the optical fibers from left to right;

[0020] S150: Winding the optical fiber 1A on the 13th layer by arranging the optical fibers from right to left;

[0021] S160: Winding the optical fiber 2A on the 14th layer by arranging the optical fibers from right to left;

[0022] S170: Winding the optical fiber 1B on the 15th layer by arranging the optical fibers from right to left.

[0023] S180: Winding of optical fiber 2B is completed by arranging the optical fibers from right to left on the 16th layer;

[0024] S190: The above 16-layer winding is regarded as a cycle, and the winding is repeated until the required number of layers is reached, thus completing the winding of the entire product.

[0025] The two-input and two-output sixteen-pole symmetrical winding method includes the following steps:

[0026] S10: First, mark the two optical fibers to be wound. Fiber 1 is marked as 1A and 1B, and fiber 2 is marked as 2A and 2B. A and B are of equal length.

[0027] S20: Place optical fiber 1A, optical fiber 1B, optical fiber 2A, and optical fiber 2B onto a ring winding machine;

[0028] S30: Winding the optical fiber 1A in the first layer by arranging the optical fibers from left to right;

[0029] S40: Winding the optical fiber 2A in the second layer by arranging the optical fibers from left to right;

[0030] S50: The optical fiber 1B is wound in the third layer by arranging the optical fibers from left to right.

[0031] S60: The optical fiber 2B is wound on the fourth layer by arranging the optical fibers from left to right.

[0032] S70: Winding the optical fiber 1B on the fifth layer by arranging the optical fibers from right to left.

[0033] S80: Complete the winding of optical fiber 2B in the sixth layer by arranging the optical fibers from right to left.

[0034] S90: Complete the winding of optical fiber 1A on the 7th layer by arranging the optical fibers from right to left;

[0035] S100: Winding the optical fiber 2A in the eighth layer by arranging the optical fibers from right to left;

[0036] S110: Complete the winding of optical fiber 1B by arranging the optical fibers from left to right on the ninth layer;

[0037] S120: Complete the winding of optical fiber 2B by arranging the optical fibers from left to right on the 10th layer;

[0038] S130: Winding the optical fiber 1A in the 11th layer by arranging the optical fibers from left to right;

[0039] S140: Winding the optical fiber 2A in the 12th layer by arranging the optical fibers from left to right;

[0040] S150: Winding the optical fiber 1A on the 13th layer by arranging the optical fibers from right to left;

[0041] S160: Winding the optical fiber 2A on the 14th layer by arranging the optical fibers from right to left;

[0042] S170: Winding the optical fiber 1B on the 15th layer by arranging the optical fibers from right to left.

[0043] S180: Winding of optical fiber 2B is completed by arranging the optical fibers from right to left on the 16th layer;

[0044] S190: Complete the winding of optical fiber 1B on the 17th layer by arranging the optical fibers from left to right.

[0045] S200: Winding the optical fiber 2B on the 18th layer by arranging the optical fibers from left to right;

[0046] S210: Winding the optical fiber 1A on the 19th layer by arranging the optical fibers from left to right;

[0047] S220: Winding the optical fiber 2A on the 20th layer by arranging the optical fibers from left to right;

[0048] S230: Winding the optical fiber 1A on the 21st layer by arranging the optical fibers from right to left;

[0049] S240: Winding the optical fiber 2A on the 22nd layer by arranging the optical fibers from right to left.

[0050] S250: Winding the optical fiber 1B on the 23rd layer by arranging the optical fibers from right to left;

[0051] S260: Winding the optical fiber 2B on the 24th layer from right to left.

[0052] S270: Complete the winding of optical fiber 1A on the 25th layer by arranging the optical fibers from left to right;

[0053] S280: Winding the optical fiber 2A on the 26th layer by arranging the optical fibers from left to right;

[0054] S290: Complete the winding of optical fiber 1B on the 27th layer by arranging the optical fibers from left to right.

[0055] S300: Winding of optical fiber 2B is completed by arranging the optical fibers from left to right on the 28th layer;

[0056] S310: Winding the optical fiber 1B on the 29th layer is completed by arranging the optical fibers from right to left.

[0057] S320: Winding the optical fiber 2B on the 30th layer from right to left.

[0058] S330: Winding the optical fiber 1A on the 31st layer by arranging the optical fibers from right to left.

[0059] S340: Winding the optical fiber 2A on the 32nd layer by arranging the optical fibers from right to left.

[0060] S350: The above 32 layers of winding are regarded as a cycle, and the winding is repeated until the required number of layers is reached, thus completing the winding of the entire product.

[0061] Beneficial effects of the present invention:

[0062] First, the present invention can produce two-input and two-output octapole and two-input and two-output hexadecapole symmetrical fiber optic ring products with two channels, which can meet the multi-channel needs of customers;

[0063] Second, the two groups of optical fibers described in the present invention achieve multi-pole symmetrical winding. The parameters of the two groups of optical fibers are consistent and symmetrically distributed. During winding, the distribution is uniform, compact and reasonable. The octupole and hexadecanopole winding methods are significantly more symmetrical and resistant to the influence of environmental changes than the quadrupole winding method. The two groups of optical fibers have exactly the same performance, making them better able to resist the drift problem caused by temperature gradients. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a working diagram of the two-input and two-output optical fiber ring octupole symmetrical winding method.

[0065] Figure 2 This is a working diagram of the two-input and two-output optical fiber ring octupole symmetrical winding method. DETAILED DESCRIPTION

[0066] The present invention will be further described below with reference to the accompanying drawings and examples.

[0067] Example 1: A two-input and two-output octapole symmetrical winding method, comprising the following steps:

[0068] S10: First, mark the two optical fibers to be wound. Fiber 1 is marked as 1A and 1B, and fiber 2 is marked as 2A and 2B. A and B are of equal length.

[0069] S20: Place optical fiber 1A, optical fiber 1B, optical fiber 2A, and optical fiber 2B onto an octupole winding machine;

[0070] S30: Winding the optical fiber 1A in the first layer by arranging the optical fibers from left to right;

[0071] S40: Winding the optical fiber 2A in the second layer by arranging the optical fibers from left to right;

[0072] S50: The optical fiber 1B is wound in the third layer by arranging the optical fibers from left to right.

[0073] S60: The optical fiber 2B is wound on the fourth layer by arranging the optical fibers from left to right.

[0074] S70: Winding the optical fiber 1B on the fifth layer by arranging the optical fibers from right to left.

[0075] S80: Complete the winding of optical fiber 2B in the sixth layer by arranging the optical fibers from right to left.

[0076] S90: Complete the winding of optical fiber 1A on the 7th layer by arranging the optical fibers from right to left;

[0077] S100: Winding the optical fiber 2A in the eighth layer by arranging the optical fibers from right to left;

[0078] S110: Complete the winding of optical fiber 1B by arranging the optical fibers from left to right on the ninth layer;

[0079] S120: Winding the optical fiber 2B on the 10th layer by arranging the optical fibers from left to right;

[0080] S130: Winding the optical fiber 1A in the 11th layer by arranging the optical fibers from left to right;

[0081] S140: Winding the optical fiber 2A in the 12th layer by arranging the optical fibers from left to right;

[0082] S150: Winding the optical fiber 1A on the 13th layer by arranging the optical fibers from right to left;

[0083] S160: Winding the optical fiber 2A on the 14th layer by arranging the optical fibers from right to left;

[0084] S170: Winding the optical fiber 1B on the 15th layer by arranging the optical fibers from right to left.

[0085] S180: Winding of optical fiber 2B is completed by arranging the optical fibers from right to left on the 16th layer;

[0086] S190: Take the above 16-layer winding as a cycle (steps S30-S180), and then repeat the cycle winding (i.e. steps S30-S180; S30-S180...S30-S180; S30-S180) until the required number of layers is reached, completing the winding of the entire product.

[0087] Specifically, the above-mentioned ring winding machine can be directly wound using the products of Wuhan Optical Valley Changyingtong Metrology Co., Ltd. Since it belongs to the existing technology, it will not be described in detail.

[0088] The optical fiber 1A and the optical fiber 1B are the first channel, and the optical fiber 2A and the optical fiber 2B are the second channel.

[0089] The above 16-layer winding process constitutes a cycle, and the process is repeated until the required number of layers is reached. The first 16 layers are wound in the order of 1A-2A-1B-2B-1B-2B-1A-2A-1B-2B-1A-2A-1A-2A-1B-2B. The first channel's fiber winding sequence is 1A-1B-1B-1A-1B-1A-1B-1B, while the second channel's fiber winding sequence is 2A-2B-2B-2A-2B-2A-2A-2B. Therefore, both layers meet the ABBABAAB octupole symmetry required for winding. Viewed from the bobbin ring side, 1A and 2B are wound in the same direction, as are 1B and 2A, but 1A and 2B are wound in opposite directions to 1B and 2A. For example, if 1A and 2B are wound clockwise, 1B and 2A should be wound counterclockwise. When crossing, allow the optical fibers to sag naturally before winding.

[0090] Example 2: A two-input and two-output sixteen-pole symmetrical winding method, comprising the following steps:

[0091] S10: First, mark the two optical fibers to be wound. Fiber 1 is marked as 1A and 1B, and fiber 2 is marked as 2A and 2B. A and B are of equal length.

[0092] S20: Place optical fiber 1A, optical fiber 1B, optical fiber 2A, and optical fiber 2B onto a ring winding machine;

[0093] S30: Winding the optical fiber 1A in the first layer by arranging the optical fibers from left to right;

[0094] S40: Winding the optical fiber 2A in the second layer by arranging the optical fibers from left to right;

[0095] S50: The optical fiber 1B is wound in the third layer by arranging the optical fibers from left to right.

[0096] S60: The optical fiber 2B is wound on the fourth layer by arranging the optical fibers from left to right.

[0097] S70: Winding the optical fiber 1B on the fifth layer by arranging the optical fibers from right to left.

[0098] S80: Complete the winding of optical fiber 2B in the sixth layer by arranging the optical fibers from right to left.

[0099] S90: Complete the winding of optical fiber 1A on the 7th layer by arranging the optical fibers from right to left;

[0100] S100: Winding the optical fiber 2A in the eighth layer by arranging the optical fibers from right to left;

[0101] S110: Complete the winding of optical fiber 1B by arranging the optical fibers from left to right on the ninth layer;

[0102] S120: Complete the winding of optical fiber 2B by arranging the optical fibers from left to right on the 10th layer;

[0103] S130: Winding the optical fiber 1A in the 11th layer by arranging the optical fibers from left to right;

[0104] S140: Winding the optical fiber 2A in the 12th layer by arranging the optical fibers from left to right;

[0105] S150: Winding the optical fiber 1A on the 13th layer by arranging the optical fibers from right to left;

[0106] S160: Winding the optical fiber 2A on the 14th layer by arranging the optical fibers from right to left;

[0107] S170: Winding the optical fiber 1B on the 15th layer by arranging the optical fibers from right to left.

[0108] S180: Winding of optical fiber 2B is completed by arranging the optical fibers from right to left on the 16th layer;

[0109] S190: Complete the winding of optical fiber 1B on the 17th layer by arranging the optical fibers from left to right.

[0110] S200: Winding the optical fiber 2B on the 18th layer by arranging the optical fibers from left to right;

[0111] S210: Winding the optical fiber 1A on the 19th layer by arranging the optical fibers from left to right;

[0112] S220: Winding the optical fiber 2A on the 20th layer by arranging the optical fibers from left to right;

[0113] S230: Winding the optical fiber 1A on the 21st layer by arranging the optical fibers from right to left;

[0114] S240: Winding the optical fiber 2A on the 22nd layer by arranging the optical fibers from right to left.

[0115] S250: Winding the optical fiber 1B on the 23rd layer by arranging the optical fibers from right to left;

[0116] S260: Winding the optical fiber 2B on the 24th layer from right to left.

[0117] S270: Complete the winding of optical fiber 1A on the 25th layer by arranging the optical fibers from left to right;

[0118] S280: Winding the optical fiber 2A on the 26th layer by arranging the optical fibers from left to right;

[0119] S290: Complete the winding of optical fiber 1B on the 27th layer by arranging the optical fibers from left to right.

[0120] S300: Winding of optical fiber 2B is completed by arranging the optical fibers from left to right on the 28th layer;

[0121] S310: Winding the optical fiber 1B on the 29th layer is completed by arranging the optical fibers from right to left.

[0122] S320: Winding the optical fiber 2B on the 30th layer from right to left.

[0123] S330: Winding the optical fiber 1A on the 31st layer by arranging the optical fibers from right to left.

[0124] S340: Winding the optical fiber 2A on the 32nd layer by arranging the optical fibers from right to left.

[0125] S350: Take the above 32-layer winding as a cycle (steps S30-S340), and then repeat the cycle winding (i.e. steps S30-S340; S30-S340...S30-S340; S30-S340) until the required number of layers is reached, completing the winding of the entire product.

[0126] Specifically, the above-mentioned ring winding machine can be directly wound using the products of Wuhan Optical Valley Changyingtong Metrology Co., Ltd. Since it belongs to the existing technology, it will not be described in detail.

[0127] The optical fiber 1A and the optical fiber 1B mentioned above are the first channel; and the optical fiber 2A and the optical fiber 2B are the second channel. The first 32 layers are wound in a cyclic order of 1A-2A-1B-2B-1B-2B-1A-2A-1B-2B-1A-2A-1B-2B-1A-2A-1A-2A-1B-2B-1A-2A-1A-2A-1B-2B-1A-2A-1B-2B-1A-2A-1B-2B-1A-2A; the winding order of the optical fiber of the first channel is: 1A-1B-1B-1A-1B-1A-1A-1B-1A-1A-1B-1A-1B-1A-1B-1A; the winding order of the optical fiber of the second channel is: 2A-2B-2B-2A-2B-2A-2A-2B-2A-2A-2B-2A-2A-2B-2A-2B-2A; therefore, the hexadecane-pole symmetrical winding process of ABBABAABBAABABBA can be met. When viewed from the skeleton ring side, 1A and 2B are wound in the same direction, and 1B and 2A are wound in the same direction, but 1A and 2B are wound in opposite directions to 1B and 2A. For example, if 1A and 2B are wound clockwise, 1B and 2A are wound counterclockwise.

[0128] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A method for preparing a two-input and two-output multi-pole symmetrically wound optical fiber ring, characterized in that: The steps include: S10: Measure two optical fibers of required length and reserve sufficient length of optical fiber pigtails at both ends of the two optical fibers; S20: mark the midpoints of the two optical fibers respectively; S30: placing the midpoint of the two optical fibers at the starting point of the optical fiber ring frame to be wound. The starting point can be selected on any side of the optical fiber ring frame; S40: Use the multi-pole symmetrical winding method to alternately wind the two optical fibers on the fiber ring frame in a mirror-symmetrical manner until the end marks at both ends of the optical fibers; S50: Lead the four optical fiber pigtails out of the optical fiber ring frame and fix them; S60: Secures the wound two-input and two-output fiber ring.

2. The method for preparing a two-input and two-output multi-pole symmetrically wound optical fiber ring according to claim 1, characterized in that: Multipole refers to an eight-pole symmetrical winding method.

3. The method for preparing a two-input and two-output octupole symmetrically wound optical fiber ring according to claim 2, characterized in that: A dual-channel optical fiber ring octupole symmetrical winding method comprises the following steps: S10: First, mark the two optical fibers to be wound. Fiber 1 is marked as 1A and 1B, and fiber 2 is marked as 2A and 2B. S20: Place optical fiber 1A, optical fiber 1B, optical fiber 2A, and optical fiber 2B onto a ring winding machine; S30: Winding the optical fiber 1A in the first layer by arranging the optical fibers from left to right; S40: Winding the optical fiber 2A in the second layer by arranging the optical fibers from left to right; S50: The optical fiber 1B is wound in the third layer by arranging the optical fibers from left to right. S60: The optical fiber 2B is wound on the fourth layer by arranging the optical fibers from left to right. S70: Winding the optical fiber 1B on the fifth layer by arranging the optical fibers from right to left. S80: Complete the winding of optical fiber 2B in the sixth layer by arranging the optical fibers from right to left. S90: Complete the winding of optical fiber 1A on the 7th layer by arranging the optical fibers from right to left; S100: Winding the optical fiber 2A in the eighth layer by arranging the optical fibers from right to left; S110: Complete the winding of optical fiber 1B by arranging the optical fibers from left to right on the ninth layer; S120: Complete the winding of optical fiber 2B by arranging the optical fibers from left to right on the 10th layer; S130: Winding the optical fiber 1A in the 11th layer by arranging the optical fibers from left to right; S140: Winding the optical fiber 2A in the 12th layer by arranging the optical fibers from left to right; S150: Winding the optical fiber 1A on the 13th layer by arranging the optical fibers from right to left; S160: Winding the optical fiber 2A on the 14th layer by arranging the optical fibers from right to left; S170: Winding the optical fiber 1B on the 15th layer by arranging the optical fibers from right to left. S180: Winding of optical fiber 2B is completed by arranging the optical fibers from right to left on the 16th layer; S190: The above 16-layer winding is regarded as a cycle, and the winding is repeated until the required number of layers is reached, thus completing the winding of the entire product.

4. The method for preparing a two-input and two-output multi-pole symmetrically wound optical fiber ring according to claim 1, characterized in that: Multipole refers to a sixteen-pole symmetrical winding method.

5. The method for preparing a two-input and two-output hexadecanoe symmetrically wound optical fiber ring according to claim 4, characterized in that: A two-input and two-output sixteen-pole symmetrical winding method comprises the following steps: S10: First, mark the two optical fibers to be wound. Fiber 1 is marked as 1A and 1B, and fiber 2 is marked as 2A and 2B. S20: Place optical fiber 1A, optical fiber 1B, optical fiber 2A, and optical fiber 2B onto a ring winding machine; S30: Winding the optical fiber 1A in the first layer by arranging the optical fibers from left to right; S40: Winding the optical fiber 2A in the second layer by arranging the optical fibers from left to right; S50: The optical fiber 1B is wound in the third layer by arranging the optical fibers from left to right. S60: The optical fiber 2B is wound on the fourth layer by arranging the optical fibers from left to right. S70: The optical fiber 1B is wound in the fifth layer by arranging the optical fibers from right to left. S80: Complete the winding of optical fiber 2B in the sixth layer by arranging the optical fibers from right to left. S90: Complete the winding of optical fiber 1A on the 7th layer by arranging the optical fibers from right to left; S100: Winding the optical fiber 2A in the eighth layer by arranging the optical fibers from right to left; S110: Complete the winding of optical fiber 1B by arranging the optical fibers from left to right on the ninth layer; S120: Complete the winding of optical fiber 2B by arranging the optical fibers from left to right on the 10th layer; S130: Winding the optical fiber 1A in the 11th layer by arranging the optical fibers from left to right; S140: Winding the optical fiber 2A in the 12th layer by arranging the optical fibers from left to right; S150: Winding the optical fiber 1A on the 13th layer by arranging the optical fibers from right to left; S160: Winding the optical fiber 2A on the 14th layer by arranging the optical fibers from right to left; S170: Winding the optical fiber 1B on the 15th layer by arranging the optical fibers from right to left. S180: Winding of optical fiber 2B is completed by arranging the optical fibers from right to left on the 16th layer; S190: Complete the winding of optical fiber 1B on the 17th layer by arranging the optical fibers from left to right. S200: Winding the optical fiber 2B on the 18th layer by arranging the optical fibers from left to right; S210: Winding the optical fiber 1A on the 19th layer by arranging the optical fibers from left to right; S220: Winding the optical fiber 2A on the 20th layer by arranging the optical fibers from left to right; S230: Winding the optical fiber 1A on the 21st layer by arranging the optical fibers from right to left; S240: Winding the optical fiber 2A on the 22nd layer by arranging the optical fibers from right to left. S250: Winding the optical fiber 1B on the 23rd layer by arranging the optical fibers from right to left; S260: Winding the optical fiber 2B on the 24th layer from right to left. S270: Complete the winding of optical fiber 1A on the 25th layer by arranging the optical fibers from left to right; S280: Winding the optical fiber 2A on the 26th layer by arranging the optical fibers from left to right; S290: Complete the winding of optical fiber 1B on the 27th layer by arranging the optical fibers from left to right. S300: Winding of optical fiber 2B is completed by arranging the optical fibers from left to right on the 28th layer; S310: Winding the optical fiber 1B on the 29th layer is completed by arranging the optical fibers from right to left. S320: Winding the optical fiber 2B on the 30th layer from right to left. S330: Winding the optical fiber 1A on the 31st layer by arranging the optical fibers from right to left. S340: Winding the optical fiber 2A on the 32nd layer by arranging the optical fibers from right to left. S350: The above 32 layers of winding are regarded as a cycle, and the winding is repeated until the required number of layers is reached, thus completing the winding of the entire product.

6. A two-input and two-output octupole symmetrically wound optical fiber ring, characterized in that: The optical fiber ring is prepared by the two-input and two-output octapole symmetrical winding preparation method according to claim 3.

7. A two-input and two-output hexadecanoe symmetrically wound optical fiber ring, characterized in that: The optical fiber ring is prepared by the two-input and two-output hexadecapole symmetrical winding preparation method according to claim 5.

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