A conformal dynamic installation method for pigtails in a portable optical communication comprehensive tester

Abstract

The invention discloses a conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester, and relates to the technical field of a pigtail installation method. The method comprises the following steps: system design splitting, system structure design, optical device layout design and pigtail fiber coiling installation design, optical device installation and pigtail fiber coiling: overall fiber coiling design is performed according to the number of optical devices, pigtail scale and length, the pigtail of the optical device is coiled on an optical signal driving PCB board, the curvature radius of the pigtail when coiling is not less than 3cm, the coiled pigtail is in a relaxed state and the coiled pigtail is fully in contact with the bottom of another PCB board, and the installation part is incompletely locked with a nylon tie. The method can reduce the volume and weight design parameters of the portable optical communication comprehensive test equipment, and ensure that the portable optical communication comprehensive test equipment does not affect the optical characteristics of the portable optical communication comprehensive test equipment in environmental adaptability tests such as vibration and impact.

Description

Technical Field

[0001] The invention relates to the technical field of methods for installing pigtails, and in particular to a conformal dynamic installation method for pigtails in a portable optical communication comprehensive tester. Background Art

[0002] Portable optical communication comprehensive test is a kind of optical communication comprehensive test equipment with light weight, small size, handheld operation, strong environmental adaptability, multi-functional integration, compact internal space of the test equipment and battery power supply. It has multiple optical test instrument functions required for daily maintenance and testing of optical fiber communication equipment, such as multi-wavelength light source, multi-wavelength optical power meter, multi-wavelength variable optical attenuator, bit error meter, OTDR optical time domain reflectometer, TDR electrical time domain reflectometer, etc., as well as complex comprehensive test functions, such as automatic or semi-automatic test of optical terminal receiving sensitivity, protocol analysis, or emergency communication functions such as optical telephone, etc.

[0003] When designing the principle and implementing the engineering of portable optical communication comprehensive test equipment, not only the technical characteristics of the test equipment, such as the test functions and the performance indicators of each function, but also the characteristic requirements of the test equipment, such as safety, reliability, EMC, environmental adaptability, operability, volume and weight, and continuous working time when powered by batteries, should be considered. The installation of the pigtail in the test equipment will directly affect the environmental adaptability of the test equipment, such as environmental adaptability requirements such as vibration and impact tests. If the pigtail is not installed properly, the optical signal test performance of the test equipment will be reduced.

[0004] In the portable optical communication comprehensive test equipment, the important signal processing system is the optical signal processing system. The optical signal processing system has both multi-wavelength emitting light sources and multi-wavelength optical signal receiving and processing subsystems. The optical devices are connected by pigtails for optical signals, and the nodes are connected by fusion. The pigtail of each optical device has a certain length (generally no more than 1.5m, or the pigtail length is customized according to requirements. The length is selected mainly to facilitate the installation, maintenance and replacement of optical devices. The pigtail length cannot be too short. If it is less than 0.5 meters, it is extremely unfavorable for the installation, maintenance and replacement of optical devices). When the optical signal processing system has many functions and the number of optical devices is considerable, the length of the pigtail connecting the optical device is considerable. If the pigtail is not installed properly, it will cause the attenuation of the optical signal. In severe cases, signal crosstalk will occur, or with vibration and impact, the input and output optical signal power will fluctuate, which will greatly affect the test performance of the optical communication comprehensive tester. Therefore, when designing the structure and process, a special pigtail installation method must be adopted that is suitable for the requirements of optical signal processing and for the characteristics of optical fiber transmission of optical signals. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to provide a method for installing a pigtail that can reduce the volume and weight design parameters of a portable optical communication comprehensive test equipment and ensure that the portable optical communication comprehensive test equipment is not affected by the optical characteristics of the portable optical communication comprehensive test equipment during environmental adaptability tests such as vibration and impact.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester, comprising the following steps:

[0007] System design splitting: Divide and design the structures of various components of the portable optical communication comprehensive tester, concentrate the optical devices on an optical signal driving PCB board, and set other PCB boards adjacent to the optical signal driving PCB board on the upper and lower sides of the optical signal driving PCB board;

[0008] System structure design: Determine the distance between the circuit boards in the portable optical communication comprehensive tester. According to the size of the optical device, the optical signal driving PCB board and other PCB boards on its upper side form a pigtail coiling space. The distance between the two is not less than 25mm. The pigtail of the optical device in the optical signal driving PCB board is between the two circuit boards. With the support of the inter-board fasteners and the upper and lower boards, the two PCB boards form a pigtail coiling box.

[0009] Optical device layout design and pigtail fiber installation design: According to the structure between PCB boards, the optical devices and pigtail fiber of the optical signal driver PCB board are laid out and designed, and mounting holes are set on the optical signal driver PCB board, including: the pigtail fiber path from the first mounting hole position of the interface board optical interface is not less than 50mm and not more than 100mm; the pigtail fiber path between the mounting holes in the optical signal driver PCB board is not less than 60mm and not more than 120mm;

[0010] Optical device installation: number the input and output connectors of the optical device and install them to the corresponding positions according to the design requirements;

[0011] Pigtail coiling: The overall coiling design is carried out according to the number of optical devices, the size of the pigtail and the length. The pigtail of the optical device is coiled on the optical signal driving PCB board. The radius of curvature when the pigtail is coiled is not less than 3cm. The coiled pigtail is in a relaxed state and fully contacts the bottom of another PCB board. In addition, all optical functions are required to be normal, and the output and input power of the optical device before and after the coiling does not change by more than 1dB. The installation part is partially locked with nylon tie.

[0012] The beneficial effect of adopting the above technical solution is that the method described in this application does not use additional installation structures (such as fiber coiling boxes, etc.) in the compact space of the portable optical communication comprehensive tester, relies on the optical device to drive the PCB board as the fiber coiling carrier, and uses the space formed between the tester circuit boards to use simple auxiliary installation parts for dynamic installation. The auxiliary installation parts are nylon cable ties. Nylon has the characteristics of good temperature characteristics, high strength, good toughness, and high chemical stability, and is suitable as an auxiliary installation part for fiber pigtail coiling. By specifying in detail the implementation steps of fiber pigtail installation during the design and development process of the portable optical communication comprehensive test, the volume and weight design parameters of the portable optical communication comprehensive tester can be reduced, ensuring that the portable optical communication comprehensive tester is not affected by environmental adaptability tests such as vibration and shock. The optical characteristics of the portable optical communication comprehensive tester are not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 is a flow chart of the method described in an embodiment of the present invention;

[0015] Figure 2 Schematic diagram of the equipment structure and fiber coil of the portable optical communication tester in the embodiment of the present invention;

[0016] Figure 3 is a schematic diagram of inter-board installation of a circuit board of a portable optical communication tester in an embodiment of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the installation of optical components and pigtail fiber coiling of the optical signal processing board in an embodiment of the present invention;

[0018] Figure 5 Schematic diagram of the appearance of a nylon cable tie in an embodiment of the present invention;

[0019] Figure 6 Schematic diagram of the installation of nylon straps in an embodiment of the present invention;

[0020] Among them: 1. Optical signal driver PCB board; 2. Other PCB boards; 3. Mounting holes; 4. Nylon cable ties; 5. Fastening nuts; 6. Mounting studs; 7. Pigtails; 8. shaped or horseshoe shaped mounting bracket. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Embodiment 1

[0023] like Figure 1 As shown, an embodiment of the present invention discloses a conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester, comprising the following steps:

[0024] System design splitting: The structures of various components of the portable optical communication comprehensive tester are divided and designed, and the optical devices are concentrated on an optical signal driving PCB board 1. Another PCB board 2 adjacent to the optical signal driving PCB board 1 is respectively arranged on the upper side and the lower side of the optical signal driving PCB board 1;

[0025] Furthermore, the optical signal driving PCB board 1 is fixedly connected to other PCB boards 2 on its upper and lower sides by inter-board fastening nuts 5 and mounting studs 6, so that there is a certain distance between the optical signal driving PCB board 1 and other PCB boards 2 on its upper and lower sides, wherein the space between the other PCB boards 2 on the upper side and the optical signal driving PCB board 1 constitutes a winding space for the pigtail.

[0026] System structure design: Determine the distance between the circuit boards in the portable optical communication comprehensive tester. According to the size of the optical device, the optical signal driving PCB board 1 and the other PCB boards 2 on its upper side form a space for the pigtail 7. The distance between the two is not less than 25mm. The pigtail of the optical device in the optical signal driving PCB board 1 is between the two circuit boards. With the support of the inter-board fasteners and the upper and lower boards, the two PCB boards form a fiber coil box for the pigtail 7.

[0027] Further, such as Figure 2As shown, since the portable optical communication comprehensive tester is relatively complex, it usually includes multiple components and multiple PCBs, and the pigtail of the optical device in the optical signal processing system board should be between the two PCB boards. Due to the support of the inter-board fasteners and the upper and lower PCB boards, a fiber coil box for the pigtail is naturally formed, and there is no need to set up a separate fiber coil box (in the design of a general optical signal processing system, when there are many optical devices, a fiber coil box is usually required, but the fiber coil box takes up too much space, which is not conducive to the miniaturization design needs of the handheld optical communication tester);

[0028] According to the characteristics of the portable optical communication comprehensive tester with multiple PCB boards, the total spacing of all circuit boards generally does not exceed 60mm ( Figure 2 and Figure 3 As shown in the figure, otherwise the test equipment will be difficult to operate by hand; determine the distance between the PCB boards of the portable optical communication comprehensive tester. According to the size of the optical device, the fiber pigtail space of the optical signal driver board should be no less than 25mm away from other circuit boards.

[0029] Optical device layout design and pigtail fiber installation design: According to the PCB board structure, the optical device and pigtail fiber of the optical signal driving PCB board 1 are laid out and designed, such as Figure 4 As shown, a mounting hole 3 is set on the optical signal driving PCB board 1, including: the pigtail fiber coiling path from the first mounting hole position of the interface board optical interface is not less than 50mm and not more than 100mm; the pigtail fiber coiling path between the mounting holes in the optical signal driving PCB board 1 is not less than 60mm and not more than 120mm;

[0030] Installation of optical devices: number the input and output connectors of optical devices to avoid installation errors and facilitate equipment maintenance and device replacement; and install them to the corresponding positions according to design requirements (including the installation of fusion protectors);

[0031] Pigtail coiling: The overall coiling design is carried out according to the number of optical devices, size of pigtails and length, such as Figure 4 As shown, the optical device pigtail is coiled on the optical signal driving PCB board 1. The curvature radius of the pigtail is not less than 3cm when it is coiled, otherwise the pigtail introduces loss, and in certain cases, it will also cause crosstalk of optical signals between the pigtails. The coiled pigtail is in a relaxed state and fully contacts the bottom of another PCB board. It is required that all optical functions are normal and the output and input power of the optical device before and after the fiber is coiled does not change by more than 1dB. The installation part uses a nylon tie 4 (its specific structure is shown in FIG. Figure 5 As shown) is not completely locked, such as Figure 6 shown.

[0032] Requirements for testing and verifying various optical functions and characteristics: Test and verify various optical functions and characteristics of the portable optical communication comprehensive tester, requiring that all optical functions are normal and that the output and input power of the optical device before and after fiber winding does not change by more than 1dB.

[0033] Steps for functional verification and performance index testing: verification and detection of laser output function and power in the optical signal processing system, and verification and detection of the function and performance of the laser detection system in the optical signal processing system.

[0034] Verification and detection decision rule setting:

[0035] 1) When the power change is less than 1 dB, fine-tune the drive circuit of the optical device to correct the error;

[0036] 2) When the power change is greater than 1dB, repeatedly check and ensure that the pigtail 7 at the nylon tie 4, the pigtail ring coil and the pigtail at the root of the optical interface remain loose, and if necessary, fine-tune the drive circuit of the optical device to correct the error;

[0037] 3) If the power variation is much greater than 1dB, and the power variation error cannot be changed through adjustment or a functional failure occurs, it is considered that the optical device is damaged or the fusion point is broken. The optical device should be replaced or the fiber should be re-fused and reeled.

[0038] Fiber coiling is completed: After the verification and correction is completed, the nylon tie 4 is locked and the pigtail 7 at the tie position is kept loose to complete the fiber coiling of the pigtail 7. The structure is as follows: Figure 4 shown.

[0039] This application proposes a conformal dynamic fiber pigtail coiling method, which does not use additional installation structures (such as fiber coiling boxes, etc.) in the compact space of a portable optical communication comprehensive tester, relies on an optical device to drive a PCB board as a fiber coiling carrier, utilizes the space formed between the circuit boards of the test equipment, and uses simple auxiliary mounting parts for dynamic installation. The auxiliary mounting parts are nylon cable ties, which have the characteristics of good temperature characteristics, high strength, good toughness, and high chemical stability, and are suitable as auxiliary mounting parts for fiber pigtail coiling.

[0040] The meanings of pigtail fiber coil include:

[0041] 1) Pigtail: A short section of optical fiber that connects the optical signal input and output of an optical device, generally not exceeding 1.5m;

[0042] 2) Fiber coiling: Since the portable optical communication comprehensive test equipment has multiple optical devices, fiber coiling means to properly install the pigtails, and fiber coiling does not affect the overall performance of the optical signal processing system;

[0043] 3) Conformal: It means that the pigtail is coiled in an integrated design with the structure of the optical communication tester and the optical signal processing system driver board. That is, the pigtail is reasonably coiled in the box space formed between the circuit boards and attached to the optical signal driver board. When coiling, it does not affect the adjustment of the optical device parameters, and it is convenient for the maintenance and replacement of the optical device.

[0044] 4) Dynamic: The optical signal is transmitted losslessly in the optical fiber, mainly because the optical signal is fully reflected in the optical fiber. When the curvature radius of the optical fiber exceeds a certain degree and destroys the total reflection condition of the light, part of the optical signal is refracted from the optical fiber, resulting in a decrease in the power of the transmitted optical signal. In order to avoid this situation, during the fiber coiling process, it is necessary to always pay attention to the curvature radius of the coiled fiber pigtail not less than 3cm. At the same time, in order to meet the requirements of the environmental adaptability test vibration and impact test, the appropriate position on the PCB board is set to set the pigtail buckle (nylon tie) so that the coiled pigtail is in a ring-shaped and loose state. At the same time, due to the fixing effect of the nylon tie, it presents a controllable state, that is, the shape is scattered but the spirit is not scattered. The dynamic ring state in engineering has an obvious shock-absorbing effect. The principle of selecting the installation distance and installing the node is to ensure that the shock-absorbing effect is played when conducting environmental adaptability tests such as vibration and impact in different directions.

[0045] 5) Fusion point: When optical signals are connected between separated optical devices, the signal connection is achieved by fusing the pigtails between the devices. In order to ensure the strength of the fusion point, a fusion protector must be used during fusion, and the fusion protector is also a part of the fiber coil installation. Embodiment 2

[0046] The embodiment of the present invention discloses a conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester, comprising the following steps:

[0047] 1) First, perform fiber splicing to connect the optical components that make up the optical signal processing system according to functional requirements. The splicing point has a protective device, which is a fiber splicing rod;

[0048] 2) Number the pigtails connected to the input and output optical interfaces. Specifically, a customized number tube is put on the root of the pigtail connected to the optical interface to avoid errors during fiber coiling or maintenance;

[0049] 3) Passive optical components and multiple fiber fusion rods are installed on a tray-type mounting bracket, and the mounting bracket is connected to the PCB board through PCB rivet nuts;

[0050] 4) Bring your own The laser and PIN or APD detector with a shaped or horseshoe-shaped mounting bracket are assembled and connected to the PCB board through PCB rivet nuts;

[0051] 5) Except for the ultra-small variable optical attenuator, most of the optical components of the test equipment are concentrated on the optical signal driving PCB board 1, and the optical components are connected by optical pigtails 7 for optical signals;

[0052] 6) During the fiber coiling process, the optical signal driving PCB board 1 is used as a fiber coiling tray. When designing the PCB board, multiple mounting holes 3 are set around it for mounting nylon ties 4. The fiber pigtail 7 is coiled along the four sides of the PCB board, and the coiled fiber pigtail 7 is loosely fixed with the nylon ties 4. Since the optical device of the optical signal driving PCB board 1 and the coiled fiber pigtail are located between the optical signal driving PCB board 1 and the other PCB board 2 above it, and due to the fixing effect of the fastening nut 5 and the mounting stud 6, a fiber coiling protection box with a tri-axial anti-vibration function is naturally formed, thereby realizing the fiber coiling of the fiber pigtail 7 of the optical device.

Claims

1. A conformal dynamic installation method for a pigtail in a portable optical communication comprehensive tester, characterized in that The steps include: System design splitting: dividing and designing the structures of various components of the portable optical communication comprehensive tester, concentrating the optical devices on an optical signal driving PCB board (1), and providing other PCB boards (2) adjacent to the optical signal driving PCB board (1) on the upper side and the lower side of the optical signal driving PCB board (1); System structure design: Determine the distance between each circuit board in the portable optical communication comprehensive tester. According to the size of the optical device, a space for fiber pigtails (7) is formed between the optical signal driving PCB board (1) and other PCB boards (2) on its upper side. The distance between the two is not less than 25 mm. The fiber pigtails of the optical device in the optical signal driving PCB board (1) are between the two circuit boards. Due to the support of the inter-board fasteners and the upper and lower boards, the two PCB boards form a fiber pigtail box (7). Optical device layout design and pigtail fiber coil installation design: According to the structure between PCB boards, the optical devices and pigtail fiber coil of the optical signal driving PCB board (1) are laid out and designed, and mounting holes (3) are provided on the optical signal driving PCB board (1), including: the pigtail fiber coil path from the first mounting hole position of the interface board optical interface is not less than 50 mm and not more than 100 mm; the pigtail fiber coil path between the mounting holes in the optical signal driving PCB board (1) is not less than 60 mm and not more than 120 mm; Optical device installation: number the input and output connectors of the optical device and install them to the corresponding positions according to the design requirements; Pigtail coiling: The overall coiling design is carried out according to the number of optical devices, the size of the pigtail and the length. The pigtail of the optical device is coiled on the optical signal driving PCB board (1). The radius of curvature of the pigtail is not less than 3 cm. The coiled pigtail is in a relaxed state and fully contacts the bottom of another PCB board. It is also required that all optical functions are normal and the output and input power of the optical device before and after coiling does not change by more than 1 dB. The installation position is partially locked with a nylon tie (4).

2. The conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester according to claim 1, characterized in that: In the system design decomposition, the optical signal driving PCB board (1) and other PCB boards (2) on its upper and lower sides are fixedly connected via inter-board fastening nuts (5) and mounting studs (6), so that there is a certain distance between the optical signal driving PCB board (1) and other PCB boards (2) on its upper and lower sides, wherein the space between the other PCB boards (2) on the upper side and the optical signal driving PCB board (1) constitutes a winding space for the pigtail.

3. The conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester according to claim 1, characterized in that: The method further comprises the steps of: The optical functions and optical characteristics of the portable optical communication comprehensive tester are tested and verified, requiring that all optical functions are normal and the output and input power of the optical device before and after fiber winding does not change by more than 1dB.

4. The conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester according to claim 1, characterized in that: The method also includes the steps of functional verification and performance index testing: Verification and detection of laser output function and power in optical signal processing system, verification and detection of function and performance of laser detection system in optical signal processing system.

5. The conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester according to claim 1, characterized in that: The method also includes the setting of verification and detection decision rules: 1) When the power change is less than 1 dB, fine-tune the drive circuit of the optical device to correct the error; 2) When the power change is greater than 1 dB, repeatedly check and ensure that the pigtail (7) at the nylon tie (4), the pigtail ring coil and the pigtail at the root of the optical interface remain loose, and if necessary, fine-tune the drive circuit of the optical device to correct the error; 3) If the power variation is much greater than 1dB, and the power variation error cannot be changed through adjustment or a functional failure occurs, it is considered that the optical device is damaged or the fusion point is broken. The optical device should be replaced or the fiber should be re-fused and reeled.

6. The conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester according to claim 1, characterized in that: The method further comprises: after the verification and correction is completed, locking the nylon cable tie (4) and keeping the pigtail (7) at the cable tie position in a loose state, thereby completing the coiling of the pigtail (7).

7. The conformal dynamic installation method of a pigtail in a portable optical communication comprehensive tester according to claim 1, characterized in that: The method comprises the following steps: 1) First, perform fiber splicing to connect the optical components that make up the optical signal processing system according to functional requirements. The splicing point has a protective device, which is a fiber splicing rod; 2) Number the pigtails connected to the input and output optical interfaces. Specifically, a customized number tube is put on the root of the pigtail connected to the optical interface to avoid errors during fiber coiling or maintenance; 3) Passive optical components and multiple fiber fusion rods are installed on a tray-type mounting bracket, and the mounting bracket is assembled and connected to the PCB board through PCB rivet nuts; 4) Bring your own The laser and the PIN or APD detector of the shaped or horseshoe-shaped mounting bracket (8) are assembled and connected to the PCB board through PCB rivet nuts; 5) Except for the ultra-small variable optical attenuator, most of the optical components of the test equipment are concentrated on the optical signal driving PCB board (1), and the optical components are connected by optical pigtails (7) for optical signals; 6) During the fiber coiling process, the optical signal driving PCB board (1) is used as a fiber coiling tray. When designing the PCB board, a plurality of mounting holes (3) are provided around the PCB board for mounting nylon cable ties (4). The fiber pigtail (7) is coiled along the PCB board and the coiled fiber pigtail (7) is loosely fixed with the nylon cable ties (4). Since the optical device of the optical signal driving PCB board (1) and the coiled fiber pigtail are located between the optical signal driving PCB board (1) and the other PCB boards (2) above it, and due to the fixing effect of the fastening nut (5) and the mounting stud (6), a fiber coiling protection box with a triaxial anti-vibration function is naturally formed, thereby realizing the fiber coiling of the fiber pigtail (7) of the optical device.

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