Novel tail fiber type circulator and packaging method thereof

Abstract

The invention discloses a novel tail fiber type circulator and a packaging method thereof. The novel tail fiber type circulator comprises a first tail fiber collimator, a second tail fiber collimator, a third tail fiber collimator, a free space circulator core, a reflecting prism and a tube shell, a first port and a second port are vertically formed in one end of the tube shell, and a third port is formed in the other end of the tube shell; the first tail fiber collimator is inserted into the first port, the second tail fiber collimator is inserted into the second port, and the third tail fiber collimator is inserted into the third port; the reflecting prism and the free space circulator core are respectively arranged at the middle part in the tube shell up and down; the first tail fiber collimator, the reflecting prism, the free space circulator core and the second tail fiber collimator are sequentially coupled; the second tail fiber collimator, the free space circulator core and the third tail fiber collimator are sequentially coupled; the novel tail fiber type circulator is simple in optical path and compact in structure, the space in the tube shell is fully utilized, miniaturization packaging is achieved, and the size of the tail fiber type circulator is reduced.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a novel pigtail type circulator and a packaging method thereof. Background Art

[0002] A fiber optic circulator is a non-reciprocal passive device with multiple input and output ports. Its characteristic is that when an optical signal is input from a specified port, it propagates through the device only in a specified order. If the transmission order of the optical signal is changed, the signal loss is significant, thus achieving signal isolation. With the continuous development of optical fiber communication technology, it has become a key component in current and future optical fiber communication systems.

[0003] A three-port fiber circulator is a multi-port, nonreciprocal optical device that allows light to propagate in only one direction. A signal input through port 1 is output through port 2, while a signal input through port 2 is output through port 3, with minimal output loss. Light input through port 2 results in significant loss when output through port 1, and similarly, light input through port 3 results in significant loss when output through both ports 1 and 2. Summary of the Invention

[0004] In order to increase the product variety of pigtail type circulators and simplify the packaging steps of pigtail type circulators, an embodiment of the present invention provides a novel pigtail type circulator and a packaging method thereof.

[0005] In a first aspect, an embodiment of the present invention provides a novel pigtail-type circulator, comprising a first pigtail collimator, a second pigtail collimator, a third pigtail collimator, a free-space circulator core, a reflecting prism, and a housing;

[0006] The tube shell is provided with a first port and a second port at the upper and lower ends thereof, and a third port at the other end thereof;

[0007] The first pigtail collimator is plugged into the first port, the second pigtail collimator is plugged into the second port, and the third pigtail collimator is plugged into the third port;

[0008] The reflecting prism and the free space annular core are respectively arranged in the middle of the tube shell.

[0009] The first pigtail collimator, the reflecting prism, the free space annular core and the second pigtail collimator are coupled in sequence;

[0010] The second pigtail collimator, the free space annular core and the third pigtail collimator are coupled in sequence.

[0011] In one or some optional embodiments, the reflecting prism is a right-angle reflecting prism, and the reflecting surface of the reflecting prism is 45°;

[0012] The output end of the first pigtail collimator is aligned with the reflective surface of the reflective prism.

[0013] In one or some optional embodiments, the free space ring core includes two polarization beam splitters, two half-wave plates, a Faraday rotator and two magnetic rings;

[0014] The two half-wave plates are respectively attached to two sides of the Faraday rotator;

[0015] The two polarization beam splitting prisms are respectively attached to the outer sides of the two half-wave plates;

[0016] The two magnetic rings are arranged at both ends of the Faraday rotator to increase the magnetic field environment of the Faraday rotator.

[0017] In one or some optional embodiments, the first pigtail collimator is bonded to the first port;

[0018] The second pigtail collimator is bonded to the second port;

[0019] The third pigtail collimator is bonded to the third port.

[0020] In one or some optional embodiments, the novel pigtail type circulator further includes a spacer;

[0021] The spacer is arranged below the first pigtail collimator and is used to support the first pigtail collimator.

[0022] In one or some optional embodiments, the novel pigtail type circulator further includes a tube shell cover plate;

[0023] The tube shell cover is sealed and connected to the tube shell.

[0024] In one or some optional embodiments, a mounting hole is provided on the upper portion of the tube shell.

[0025] In a second aspect, an embodiment of the present invention provides a packaging method for the novel pigtail circulator according to the first aspect, comprising:

[0026] Insert the first pigtail collimator into the first port of the tube shell, apply glue, bake and solidify it;

[0027] According to the preset optical path, the reflecting prism and the free space ring core are sequentially mounted at corresponding positions in the tube shell, and baked and cured;

[0028] Connecting a light source to the first pigtail collimator, inserting the second pigtail collimator into the second port, and connecting a power meter to the second pigtail collimator;

[0029] Coupling and adjusting the position of the second pigtail collimator, monitoring the insertion loss between the first pigtail collimator and the second pigtail collimator using a power meter, and curing the second pigtail collimator by dispensing glue and baking after reaching a first target insertion loss value range;

[0030] Connecting a light source to the second pigtail collimator, inserting the third pigtail collimator into the second port, and connecting a power meter to the third pigtail collimator;

[0031] Coupling and adjusting the position of the third pigtail collimator, monitoring the insertion loss between the second pigtail collimator and the third pigtail collimator by a power meter, and curing the third pigtail collimator by dispensing glue and baking after reaching a second target insertion loss value range;

[0032] The tube shell cover plate is connected to the tube shell by seam welding.

[0033] In one or some optional embodiments, before sequentially mounting the reflective prism and the free-space ring core at corresponding positions in the tube shell according to the preset optical path and baking and curing them, the method further includes:

[0034] The spacer is mounted below the first pigtail collimator.

[0035] In one or some optional embodiments, after adjusting the position of the third pigtail collimator by coupling, monitoring the insertion loss between the second pigtail collimator and the third pigtail collimator by a power meter, and reaching a second target insertion loss value range, and curing the third pigtail collimator by glue dispensing and baking, the method further includes:

[0036] The first port, the second port and the third port of the tube shell are filled with sealing glue.

[0037] The beneficial effects of the above technical solutions provided in the embodiments of the present invention include at least:

[0038] The novel pigtail circulator provided in an embodiment of the present invention comprises a first pigtail collimator, a second pigtail collimator, and a third pigtail collimator, respectively inserted into three ports of a tube shell, and a reflecting prism and a free-space circulator core arranged in the middle of the tube shell according to optical path requirements. The output light of the first pigtail collimator passes through the reflecting prism and the free-space circulator core and enters the second pigtail collimator, and the output light of the second pigtail collimator passes through the free-space circulator core and enters the third pigtail collimator. The optical path is simple and the structure is compact, which fully utilizes the space within the tube shell, realizes miniaturized packaging, and reduces the size of the pigtail circulator.

[0039] In the novel pigtail-type circulator provided in an embodiment of the present invention, a first pigtail collimator, a second pigtail collimator, and a third pigtail collimator are plugged into different ports of a tube shell. During packaging, coupling adjustment can be performed by adjusting the lengths of the first pigtail collimator, the second pigtail collimator, and the third pigtail collimator inserted into the tube shell. This is simple to operate, helps to simplify the packaging steps, and reduces packaging costs.

[0040] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0041] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 A schematic diagram of the internal structure of a novel pigtail circulator provided in an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the external structure provided in an embodiment of the present invention;

[0045] Figure 3 A schematic structural diagram of a free space annular core provided in an embodiment of the present invention;

[0046] Figure 4 This is a diagram illustrating the optical transmission principle of a free-space ring core provided in an embodiment of the present invention.

[0047] Reference numerals:

[0048] 1. First pigtail collimator; 2. Second pigtail collimator; 3. Third pigtail collimator; 4. Reflecting prism; 5. Free-space ring core; 51. Polarization beam splitter prism; 52. Half-wave plate; 53. Faraday rotator; 54. Magnetic ring; 6. Spacer; 7. Tube shell; 71. Mounting hole; 8. Tube shell cover. DETAILED DESCRIPTION

[0049] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0050] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "back" and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] The inventors discovered that existing three-port fiber circulators primarily consist of optical components such as a collimator, a wedge plate, a magnetic ring, and a Faraday rotator. Light enters the collimator, passes through the wedge plate, and then enters the Faraday rotator and magnetic ring to deflect and transmit P and S light. This arrangement results in a long optical conversion path, leading to a larger overall package size. Furthermore, existing three-port fiber circulators use a tapered pigtail process at both ends, requiring the collimator to be fully inserted into the package housing, making miniaturization difficult.

[0053] Based on this, an embodiment of the present invention provides a novel pigtail circulator and a packaging method thereof, which are described in detail below through specific embodiments.

[0054] Example 1

[0055] The embodiment of the present invention provides a novel pigtail type circulator, referring to Figure 1 and Figure 2 As shown, it includes a first pigtail collimator 1, a second pigtail collimator 2, a third pigtail collimator 3, a free space ring core 5, a reflecting prism 4 and a tube shell 7;

[0056] The tube shell 7 is provided with a first port and a second port at one end and a third port at the other end.

[0057] The first pigtail collimator 1 is plugged into the first port, the second pigtail collimator 2 is plugged into the second port, and the third pigtail collimator 3 is plugged into the third port;

[0058] The reflecting prism 4 and the free space annular core 5 are respectively arranged in the middle of the tube shell 7.

[0059] The first pigtail collimator 1, the reflecting prism 4, the free space annular core 5 and the second pigtail collimator 2 are coupled in sequence;

[0060] The second pigtail collimator 2 , the free space annular core 5 and the third pigtail collimator 3 are coupled in sequence.

[0061] In this embodiment of the present invention, the reflective prism 4 is a right-angle reflective prism 4 with a 45° reflective surface. One right-angled surface of the reflective prism 4 is mounted on the inner top surface of the tube shell 7, and the 45° reflective surface faces the first pigtail collimator 1 and the free-space annular core 5. After the signal light output by the first pigtail collimator 1 is parallel to the reflective surface of the reflective prism 4, it can be vertically reflected into the free-space annular core 5.

[0062] In the practice of the present invention, reference is made to Figure 3 and Figure 4 As shown, the free-space ring core 5 includes two polarization beam splitters 51, two half-wave plates 52, a Faraday rotator 53, and two magnetic rings 54. The two half-wave plates 52 are attached to either side of the Faraday rotator 53; the two polarization beam splitters 51 are attached to the outer sides of the two half-wave plates 52; and the two magnetic rings 54 are positioned at either end of the Faraday rotator 53 to provide a magnetic field environment for the Faraday rotator 53 and drive its operation. After signal light enters the free-space ring core 5, the transmission path is as follows: light enters the polarization beam splitter prism 51, which decomposes the light into S-polarized light and P-polarized light. The S-polarized and P-polarized light are then input to the half-wave plate 52, which adjusts the polarization state of the light. That is, it rotates the light of a certain polarization state separated by the polarization beam splitter prism 51 by a specific angle. The light output from the half-wave plate 52 is then input to the Faraday rotator 53, where it rotates its polarization plane under the action of the magnetic field.

[0063] In the embodiment of the present invention, the first pigtail collimator 1, the reflecting prism 4, the free space annular core 5 and the second pigtail collimator 2 are coupled in sequence. Figure 1 、 Figure 3 and Figure 4As shown, the transmission path of the signal light from the first pigtail collimator 1 to the second pigtail collimator 2 is as follows: After the signal light (Port 1) is parallel to the reflective surface of the reflective prism 4, it is reflected to the polarization beam splitter prism 51. The polarization beam splitter prism 51 decomposes the light into S-polarized light and P-polarized light. The S-polarized light and P-polarized light are input to the half-wave plate 52. After the light of a certain polarization state separated by the polarization beam splitter prism 51 is rotated 45°, it is input to the Faraday rotator 53. The polarization plane is rotated under the action of the magnetic field, and the signal light (Port 2) is output.

[0064] In the embodiment of the present invention, the second pigtail collimator 2, the free space annular core 5 and the third pigtail collimator 3 are coupled in sequence. Figure 3 and Figure 4 As shown, the transmission path of the signal light from the second pigtail collimator 2 to the third pigtail collimator 3 is as follows: the signal light (Port 2) is incident parallel to the polarization beam splitter prism 51, which decomposes the light into S-polarized light and P-polarized light. The S-polarized light and P-polarized light are input to the half-wave plate 52. The light of a certain polarization state separated by the polarization beam splitter prism 51 is rotated 45° and then input to the Faraday rotator 53. The polarization plane is rotated under the action of the magnetic field, and the signal light (Port 3) is output.

[0065] In the embodiment of the present invention, referring to Figure 1 As shown, the first port is located behind the second port so that the first pigtail collimator 1 and the second pigtail collimator 2 are at least partially staggered in the front-to-back direction, and the length of the first pigtail collimator 1 extending into the tube shell 7 is longer than the length of the second pigtail collimator 2 extending into the tube shell 7, so that they can cooperate with the positions of the reflecting prism 4 and the free space annular core 5, make full use of the space in the tube shell 7, improve space utilization, thereby reducing the volume as much as possible and realizing miniaturized packaging.

[0066] The novel pigtail circulator provided in the embodiment of the present invention is configured by respectively inserting a first pigtail collimator 1, a second pigtail collimator 2, and a third pigtail collimator 3 into the three ports of a tube shell 7, and arranging a reflective prism 4 and a free-space circulator core 5 in the middle of the tube shell 7 according to the requirements of the optical path. The output light of the first pigtail collimator 1 enters the second pigtail collimator 2 after passing through the reflective prism 4 and the free-space circulator core 5, and the output light of the second pigtail collimator 2 enters the third pigtail collimator 3 after passing through the free-space circulator core 5. The optical path is simple and the structure is compact, which fully utilizes the space in the tube shell 7, realizes miniaturized packaging, and reduces the volume of the pigtail circulator.

[0067] In the novel pigtail-type circulator provided in the embodiment of the present invention, the first pigtail collimator 1, the second pigtail collimator 2, and the third pigtail collimator 3 are plugged into different ports of the tube shell 7. During packaging, coupling adjustment can be performed by adjusting the lengths of the first pigtail collimator 1, the second pigtail collimator 2, and the third pigtail collimator 3 inserted into the tube shell 7. This operation is simple, the packaging steps are simplified, and the packaging cost is reduced.

[0068] In this embodiment of the present invention, a first pigtail collimator 1 is bonded to the first port. Specifically, the first pigtail collimator 1 is first fixed to the first port by dispensing and curing. After curing, a sealant is filled into the first port to ensure connection stability and the sealing of the tube shell 7. Correspondingly, the second pigtail collimator 2 is bonded to the second port in the same manner, and the third pigtail collimator 3 is bonded to the third port in the same manner.

[0069] In the embodiment of the present invention, referring to Figure 1 As shown, the novel pigtail circulator further includes a spacer 6. The spacer 6 is a glass spacer, which is arranged below the first pigtail collimator 1 and behind the second pigtail collimator 2, thereby providing support for the first pigtail collimator 1 and limiting the position of the second pigtail collimator 2, which is beneficial to improving the stability of the package.

[0070] In the embodiment of the present invention, referring to Figure 1 and Figure 2 As shown, the novel pigtail circulator further includes a housing cover plate 8, which is sealed to the housing 7, thereby achieving an overall sealed package. Optionally, the housing cover plate 8 is welded to the housing 7 by seam welding to ensure a stable seal.

[0071] In the embodiment of the present invention, referring to Figure 1 and Figure 2 As shown, a mounting hole 71 is provided on the upper portion of the tube shell 7 for inserting fasteners such as screws to facilitate fixing the novel pigtail type circulator to a target installation position.

[0072] Example 2

[0073] Based on the same inventive concept, an embodiment of the present invention further provides a packaging method for the novel pigtail circulator described in embodiment 1, comprising:

[0074] S101: insert the first pigtail collimator 1 into the first port of the tube shell 7, and glue and bake to solidify;

[0075] S102: according to the preset optical path, the reflecting prism 4 and the free space ring core 5 are sequentially mounted at corresponding positions in the tube shell 7, and baked and cured;

[0076] S103: Connect the first pigtail collimator 1 to a light source, insert the second pigtail collimator 2 into the second port, and connect the second pigtail collimator 2 to a power meter;

[0077] S104: Coupling and adjusting the position of the second pigtail collimator 2, monitoring the insertion loss between the first pigtail collimator 1 and the second pigtail collimator 2 by a power meter, and curing the second pigtail collimator 2 by applying glue and baking after reaching a first target insertion loss value range;

[0078] S105: Connect the second pigtail collimator 2 to a light source, insert the third pigtail collimator 3 into the second port, and connect the third pigtail collimator 3 to a power meter;

[0079] S106: Coupling and adjusting the position of the third pigtail collimator 3, monitoring the insertion loss between the second pigtail collimator 2 and the third pigtail collimator 3 by a power meter, and curing the third pigtail collimator 3 by applying glue and baking after the insertion loss reaches a second target insertion loss range;

[0080] S107: Connect the tube shell cover plate 8 to the tube shell 7 by seam welding.

[0081] In the implementation of the present invention, the preset optical path refers to the transmission path of the signal light from the first pigtail collimator 1 to the second pigtail collimator 2, and then from the second pigtail collimator 2 to the third pigtail collimator 3. Step S102: According to the preset optical path, the reflective prism 4 and the free space annular core 5 are sequentially mounted at corresponding positions in the tube shell 7 and baked and cured. Specifically, the following steps may be performed:

[0082] A right-angled surface of the reflecting prism 4 is mounted on the top surface of the tube shell 7, and the reflecting surface of the reflecting prism 4 faces the output end of the first pigtail collimator 1. The parallel signal light output by the first pigtail collimator 1 can be vertically reflected downward by the reflecting prism 4;

[0083] The free-space ring core 5 is mounted on the bottom surface of the tube shell 7 and is located below the reflecting prism 4, so that the signal light output by the first pigtail collimator 1 can be vertically reflected by the reflecting prism 4 into the free-space ring core 5;

[0084] The tube shell 7 with the reflective prism 4 and the free space ring core 5 mounted thereon is baked and solidified.

[0085] In an embodiment of the present invention, before sequentially mounting the reflective prism 4 and the free-space ring core 5 at corresponding positions in the tube shell 7 according to a preset optical path and baking and curing them, the following steps may also be included:

[0086] The spacer 6 is mounted below the first pigtail collimator 1. Specifically, the spacer 6 is mounted on the bottom surface of the tube shell 7, below the first pigtail collimator 1, and behind the second port of the tube shell 7, thereby providing support for the first pigtail collimator 1 and limiting the position of the subsequently inserted second pigtail collimator 2 to improve sealing stability.

[0087] In an embodiment of the present invention, after coupling and adjusting the position of the third pigtail collimator 3, monitoring the insertion loss value between the second pigtail collimator 2 and the third pigtail collimator 3 by a power meter, and reaching the second target insertion loss value range, and then curing the third pigtail collimator 3 by glue dispensing and baking, the method further includes:

[0088] Fill the first port, the second port and the third port of the tube shell 7 with sealing glue to strengthen the connection between the first pigtail collimator 1, the second pigtail collimator 2 and the third pigtail collimator 3 and the ports of the tube shell 7, and ensure that the ports of the tube shell 7 are sealed, thereby preventing dust, moisture, etc. from entering the interior of the circulator, protecting the internal components from corrosion, and extending the life of the equipment.

[0089] The packaging method of the novel pigtail-type circulator provided in an embodiment of the present invention greatly simplifies the optical path by providing a reflective prism 4 and a free-space circulator core 5 in combination with three pigtail collimators, avoids the complexity of the optical path caused by the superposition of multiple optical components, and effectively utilizes the space inside the tube shell 7, thereby achieving a compact structure and miniaturized packaging.

[0090] The packaging method of the novel pigtail type circulator provided in the embodiment of the present invention can adjust the coupling by adjusting the length of the three pigtail collimators inserted into the tube shell 7 by plugging the first pigtail collimator 1, the second pigtail collimator 2 and the third pigtail collimator 3 into the two ends of the tube shell 7, thereby simplifying the difficulty of coupling packaging and improving the coupling efficiency.

[0091] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and variations may be made without departing from the scope of the present disclosure. The scope of the present disclosure is limited solely by the appended claims. Thus, to the extent such modifications and variations fall within the scope of the claims and their equivalents, the present disclosure is intended to include such modifications and variations.

Claims

1. A novel pigtail type circulator, characterized in that: It includes a first pigtail collimator, a second pigtail collimator, a third pigtail collimator, a free space annular core, a reflecting prism and a tube shell; The tube shell is provided with a first port and a second port at the upper and lower ends thereof, and a third port at the other end thereof; The first pigtail collimator is plugged into the first port, the second pigtail collimator is plugged into the second port, and the third pigtail collimator is plugged into the third port; The reflecting prism and the free space annular core are respectively arranged in the middle of the tube shell. The first pigtail collimator, the reflecting prism, the free space annular core and the second pigtail collimator are coupled in sequence; The second pigtail collimator, the free space annular core and the third pigtail collimator are coupled in sequence.

2. The novel pigtail type circulator according to claim 1, characterized in that: The reflecting prism is a right-angle reflecting prism, and the reflecting surface of the reflecting prism is 45°; The output end of the first pigtail collimator is aligned with the reflective surface of the reflective prism.

3. The novel pigtail type circulator according to claim 1, characterized in that: The free space ring core includes two polarization beam splitters, two half-wave plates, a Faraday rotator and two magnetic rings; The two half-wave plates are respectively attached to two sides of the Faraday rotator; The two polarization beam splitting prisms are respectively attached to the outer sides of the two half-wave plates; The two magnetic rings are arranged at both ends of the Faraday rotator to increase the magnetic field environment of the Faraday rotator.

4. The novel pigtail type circulator according to claim 1, characterized in that: The first pigtail collimator is bonded to the first port; The second pigtail collimator is bonded to the second port; The third pigtail collimator is bonded to the third port.

5. The novel pigtail type circulator according to claim 1, characterized in that: Also includes spacers; The spacer is arranged below the first pigtail collimator and is used to support the first pigtail collimator.

6. The novel pigtail type circulator according to claim 1, characterized in that: Also included is a tube shell cover; The tube shell cover is sealed and connected to the tube shell.

7. The novel pigtail type circulator according to claim 1, characterized in that: The upper portion of the tube shell is provided with a mounting hole.

8. A packaging method for the novel pigtail circulator according to any one of claims 1 to 7, characterized in that: include: Insert the first pigtail collimator into the first port of the tube shell, apply glue, bake and solidify it; According to the preset optical path, the reflecting prism and the free space ring core are sequentially mounted at corresponding positions in the tube shell, and baked and cured; Connecting a light source to the first pigtail collimator, inserting the second pigtail collimator into the second port, and connecting a power meter to the second pigtail collimator; Coupling and adjusting the position of the second pigtail collimator, monitoring the insertion loss between the first pigtail collimator and the second pigtail collimator using a power meter, and curing the second pigtail collimator by dispensing glue and baking after reaching a first target insertion loss value range; Connecting a light source to the second pigtail collimator, inserting the third pigtail collimator into the second port, and connecting a power meter to the third pigtail collimator; Coupling and adjusting the position of the third pigtail collimator, monitoring the insertion loss between the second pigtail collimator and the third pigtail collimator by a power meter, and curing the third pigtail collimator by dispensing glue and baking after reaching a second target insertion loss value range; The tube shell cover plate is connected to the tube shell by seam welding.

9. The packaging method of the novel pigtail type circulator according to claim 8, characterized in that: Before sequentially mounting the reflective prism and the free-space ring core at corresponding positions in the tube shell according to the preset optical path and baking and curing them, the method further includes: The spacer is mounted below the first pigtail collimator.

10. The packaging method of the novel pigtail type circulator according to claim 1, characterized in that: After adjusting the position of the third pigtail collimator by coupling, monitoring the insertion loss between the second pigtail collimator and the third pigtail collimator by a power meter, and after the insertion loss reaches a second target insertion loss value range, curing the third pigtail collimator by glue dispensing and baking, the method further includes: The first port, the second port and the third port of the tube shell are filled with sealing glue.

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