Measuring device for welding quality of passive optical fiber

Abstract

The utility model discloses a passive optical fiber welding quality measuring device, which comprises an optical fiber to be measured, a light source generator, a beam splitter, a circulator, a first photoelectric detector, a second photoelectric detector and a third photoelectric detector, the optical fiber to be measured is formed by welding two passive optical fibers, and a melting point is formed at the welding part; the first photoelectric detector is connected with the beam splitter, and the second photoelectric detector is connected with the circulator; one end of the to-be-detected optical fiber is connected with the output end of the circulator, and the other end is connected with the third photoelectric detector; the light source generator emits a light signal, the light signal enters the beam splitter, light is divided into two paths through the beam splitter, and one path of light is transmitted to the first photoelectric detector and used for monitoring the light intensity of beam splitting of the beam splitter; compared with the prior art, the device is simple in structure, convenient to operate and low in cost; the method is not only suitable for optimizing welding parameters of optical fibers of known models, but also suitable for optimizing welding parameters of optical fibers of unknown models.

Description

Technical Field

[0001] The utility model relates to the field of optical fiber melting point detection, in particular to a device and method for measuring the quality of passive optical fiber fusion splicing. Background Art

[0002] When light is transmitted in an optical fiber, it will produce loss. This loss is mainly composed of the transmission loss of the optical fiber itself and the fusion loss at the melting point of the optical fiber. The existing optical fiber fusion technology mainly uses a fiber fusion machine to fuse the optical fiber and the optical fiber together into a whole. The melting point loss is closely related to the fusion process. Since the quality of optical fiber splicing affects the transmission loss of the optical fiber line, it is necessary to reduce the optical fiber fusion loss as much as possible to ensure the quality and stability of optical fiber transmission.

[0003] At present, the commonly used equipment for judging the quality of optical fiber fusion splicing is optical time domain reflectometer and optical frequency domain reflectometer, which are made based on the backscattering of light and the Fresnel reverse principle, and use the backscattered light generated when light propagates in the optical fiber to obtain attenuation information, which can be used to measure optical fiber attenuation, joint loss, optical fiber fault point location, and understand the loss distribution along the length of the optical fiber, etc. However, this equipment is relatively complex, expensive, and has a low cost performance. Utility Model Content

[0004] The utility model aims to provide a passive optical fiber fusion quality measuring device and method, aiming at the existing optical fiber fusion quality detection equipment, which is complex in structure, expensive in cost, and low in cost performance, and is not suitable for small and medium-sized enterprises.

[0005] In order to achieve the above objectives, the utility model adopts the following technical solutions:

[0006] A device for measuring the quality of passive optical fiber fusion splicing, comprising an optical fiber to be tested, wherein the optical fiber to be tested is made by fusion splicing two passive optical fibers, and a melting point is formed at the fusion splicing location, and further comprising a light source generator, a beam splitter, a circulator, a first photodetector, a second photodetector, and a third photodetector; the first photodetector is connected to the beam splitter, and the second photodetector is connected to the circulator; one end of the optical fiber to be tested is connected to the output end of the circulator, and the other end is connected to the third photodetector;

[0007] Among them, the light source generator emits a light signal, the light signal enters the beam splitter, and the light is divided into two paths by the beam splitter. One path of light is transmitted to the first photodetector for monitoring the light intensity of the beam split by the beam splitter; the other path of light is transmitted to the circulator and transmitted to the optical fiber to be tested through the circulator; the backscattered light generated by the optical fiber to be tested is transmitted to the second photodetector through the circulator to monitor the backscattered luminosity of the optical fiber to be tested; the light is transmitted to the third photodetector through the optical fiber to be tested to monitor the transmitted light intensity of the optical fiber to be tested.

[0008] As a further preferred embodiment of the present invention, output ends of the third photoelectric detector and the circulator are both provided with optical fiber flange interfaces.

[0009] As a further preferred embodiment of the present invention, optical fiber connectors are installed at both ends of the optical fiber to be tested for connection with an optical fiber flange interface.

[0010] A method for measuring the quality of passive optical fiber fusion splicing, comprising the following steps:

[0011] S1. Calibrate and zero the measuring device;

[0012] S2. Select the output band of the light source generator based on the working band of the optical fiber to be tested;

[0013] S3, the light source generator emits a light signal of constant intensity and transmits it into the beam splitter;

[0014] S4, the beam splitter divides the optical signal into two parts according to a fixed ratio, one part is transmitted to the first photodetector, and the light intensity P0 split by the beam splitter is monitored by the first photodetector;

[0015] S5, another part is transmitted to the circulator, enters the optical fiber to be tested through the circulator, and transmits the backscattered light of the optical fiber to be tested to the second photodetector, and the backscattered light intensity P2 of the optical fiber to be tested is monitored by the second photodetector;

[0016] S6. Based on the beam splitting ratio of the beam splitter, the insertion loss of the beam splitter, and the insertion loss of the circulator, the optical output power P1 of the circulator is calculated;

[0017] S7, through, melting point return loss = P1-P2,

[0018] Calculate the return loss parameters of the melting point and record the parameters

[0019] S8, the optical signal is transmitted to the third photodetector through the optical fiber to be tested, and the light intensity P3 of the optical fiber to be tested is monitored by the third photodetector;

[0020] S9, based on the light intensity P3 of the optical fiber to be tested,

[0021] Through, the insertion loss of melting point = P1-P3,

[0022] Calculate the insertion loss parameters of the melting point and record the parameters;

[0023] S10, disconnect the two passive optical fibers of the optical fiber to be tested, re-splice, repeat S3-S8, monitor and record the insertion loss parameters and return loss parameters of the melting point;

[0024] S11. After several times, calculate the insertion loss fluctuation and return loss fluctuation of the melting point;

[0025] S12. Determine the stability of the measuring device based on the insertion loss fluctuation and return loss fluctuation of the melting point.

[0026] As a further preferred embodiment of the present invention, the calibration and zeroing of the measuring device comprises:

[0027] Select standard fiber access measurement device;

[0028] Turn on the light source generator and calibrate the first photodetector, the second photodetector and the third photodetector to zero.

[0029] As a further preferred embodiment of the present invention, the method of judging the stability of the measuring device according to the insertion loss fluctuation and return loss fluctuation of the melting point includes:

[0030] S121, through multiple welding, measurement, cutting off the melting point, welding again, and measurement experiments, the insertion loss and return loss of multiple melting points are obtained;

[0031] S122, through

[0032] Insertion loss fluctuation = maximum insertion loss - minimum insertion loss;

[0033] Loss fluctuation = maximum loss - minimum loss;

[0034] Insertion loss fluctuation and return loss fluctuation are calculated;

[0035] S123, determining whether the insertion loss fluctuation and the return loss fluctuation are within a preset range;

[0036] S124. If both the insertion loss fluctuation and the return loss fluctuation are within the preset range, the measuring device is stable;

[0037] S125. If the insertion loss fluctuation and the return loss fluctuation are not within the preset range, replace the light source generator and the photodetector.

[0038] The device and method for measuring the quality of passive optical fiber fusion splicing proposed by the utility model have the following beneficial effects compared with the prior art:

[0039] 1. The utility model has a simple structure, is easy to obtain, has low cost and a wide range of applications;

[0040] 2. The utility model can provide welding parameters for the welding machine by detecting the insertion loss fluctuation and return loss fluctuation of the melting point, thereby improving the quality of optical fiber welding;

[0041] 3. The utility model is not only applicable to optimizing the fusion splicing parameters of optical fibers of known models, but also applicable to optimizing the fusion splicing parameters of optical fibers of unknown models. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1The utility model is a structural schematic diagram of a device for measuring the quality of passive optical fiber fusion splicing.

[0043] The meanings of the reference numerals in the figure are: 1. light source generator, 2. beam splitter, 3. first photodetector, 4. circulator, 5. second photodetector, 6. third photodetector, 7. optical fiber to be tested. DETAILED DESCRIPTION

[0044] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] The utility model relates to a passive optical fiber fusion quality measuring device and a measuring method, which are not only suitable for optimizing the fusion parameters of optical fibers of known models, but also suitable for optimizing the fusion parameters of optical fibers of unknown models; in addition, the device has a simple structure, is easy to obtain, and has a low cost.

[0046] Embodiment 1: Combination Figure 1 , a passive optical fiber fusion quality measuring device, comprising an optical fiber to be tested, wherein the optical fiber to be tested is made by fusion-joining two passive optical fibers, and a melting point is formed at the fusion joint, and further comprising a light source generator, a beam splitter, a circulator, a first photodetector, a second photodetector and a third photodetector; the first photodetector is connected to the beam splitter, and the second photodetector is connected to the circulator; one end of the optical fiber to be tested is connected to the output end of the circulator, and the other end is connected to the third photodetector;

[0047] Among them, the light source generator emits a light signal, the light signal enters the beam splitter, and the light is divided into two paths by the beam splitter. One path of light is transmitted to the first photodetector for monitoring the light intensity of the beam splitter; the other path of light is transmitted to the circulator, and is transmitted to the optical fiber to be tested through the circulator; the backscattered light generated by the optical fiber to be tested is transmitted to the second photodetector through the circulator to monitor the backscattered luminosity of the optical fiber to be tested; the light is transmitted to the third photodetector through the optical fiber to be tested, and is used to monitor the transmitted light intensity of the optical fiber to be tested; the output ends of the third photodetector and the circulator are both provided with optical fiber flange interfaces, and optical fiber connectors are installed at both ends of the optical fiber to be tested for connection with the optical fiber flange interface.

[0048] Embodiment 2: A method for measuring the quality of passive optical fiber fusion splicing, comprising the following steps:

[0049] S1. Calibrate and zero the measuring device.

[0050] Select standard fiber access measurement device;

[0051] Turn on the light source generator and calibrate the first photodetector, the second photodetector and the third photodetector to zero.

[0052] S2. Based on the working band of the optical fiber to be tested, select the output band of the light source generator.

[0053] S3. The light source generator emits a light signal of constant intensity and transmits it to the beam splitter.

[0054] S4. The beam splitter divides the optical signal into two parts according to a fixed ratio. One part is transmitted to the first photodetector, and the light intensity P0 split by the beam splitter is monitored by the first photodetector; the fixed ratio refers to the splitting ratio of the beam splitter device, and the fixed ratio can be arbitrarily selected according to the user's needs.

[0055] S5, the other part is transmitted to the circulator, enters the optical fiber to be tested through the circulator, and transmits the backscattered light of the optical fiber to be tested to the second photodetector, and the backscattered light intensity P2 of the optical fiber to be tested is monitored by the second photodetector.

[0056] S6. Based on the beam splitting ratio of the beam splitter, the insertion loss of the beam splitter, and the insertion loss of the circulator, the optical output power P1 of the circulator is calculated; wherein, the beam splitting ratio of the beam splitter, the insertion loss of the beam splitter, and the circulator need to be tested before the device is manufactured, and they are fixed parameters, and the optical output power P1 = the output power of the light source generator - the fixed parameters.

[0057] S7, through, melting point return loss = P1-P2,

[0058] Calculate the return loss parameters of the melting point and record the parameters.

[0059] S8. The optical signal is transmitted to the third photodetector through the optical fiber to be tested, and the light intensity P3 of the transmitted light of the optical fiber to be tested is monitored by the third photodetector.

[0060] S9, based on the light intensity P3 of the optical fiber to be tested,

[0061] Through, the insertion loss of melting point = P1-P3,

[0062] Calculate the insertion loss parameters of the melting point and record the parameters.

[0063] S10, disconnect the two passive optical fibers of the optical fiber to be tested, re-splice, repeat S3-S8, monitor and record the insertion loss parameters and return loss parameters of the melting point.

[0064] S11. After several times, calculate the insertion loss fluctuation and return loss fluctuation of the melting point.

[0065] S12. The stability of the measuring device is determined based on the insertion loss fluctuation and return loss fluctuation of the melting point. The stability is generally determined by measuring multiple times and calculating the insertion loss fluctuation and return loss fluctuation, that is, by the difference between the maximum value and the minimum value. It can also be determined by the root mean square error.

[0066] S121, through multiple welding, measurement, cutting off the melting point, welding again, and measurement experiments, the insertion loss and return loss of multiple melting points are obtained.

[0067] S122, through

[0068] Insertion loss fluctuation = maximum insertion loss - minimum insertion loss;

[0069] Loss fluctuation = maximum loss - minimum loss;

[0070] Insertion loss fluctuation and return loss fluctuation are calculated.

[0071] S123. Determine whether the insertion loss fluctuation and return loss fluctuation are within a preset range. The preset range of the insertion loss fluctuation and return loss fluctuation is user-defined. Different types of optical fibers have different requirements for insertion loss and return loss. It is generally recommended to select within 0.02 dB.

[0072] S124. If the insertion loss fluctuation and the return loss fluctuation are both within the preset range, the measuring device is stable.

[0073] S125. If the insertion loss fluctuation and the return loss fluctuation are not within the preset range, replace the light source generator and the photodetector.

[0074] S13, the measuring device is stable, and the current optical fiber fusion parameters are obtained, and the fusion parameters are sent to the fusion splicer for automatic fusion splicing.

[0075] Example 3: Testing device stability

[0076] The working band of the melting point test optical fiber (7) is C band. The light source (1) adopts C band broadband light source. The beam splitter (2) has a fixed ratio of 999:1. The test optical fibers are two passive optical fibers with optical fiber connectors at one end, and the models of the two optical fibers are SM28e.

[0077] Use the fusion splicer to weld two passive optical fibers with optical fiber connectors at both ends together in AUTO mode, and calculate the insertion loss and return loss of the melting point. After cutting off the melting point, weld again and calculate the insertion loss and return loss of the melting point. Repeat this process 10 times.

[0078] The insertion loss fluctuation (maximum insertion loss - minimum insertion loss) of these 10 tests is calculated to be 0.02dB; the return loss fluctuation (maximum return loss - minimum return loss) of these 10 tests is calculated to be 0.16dB.

[0079] The above tests show that the device has good stability.

[0080] Example 4: Optimizing welding parameters

[0081] The working band of the melting point test optical fiber (7) is C band. The light source (1) adopts C band broadband light source. The beam splitter (2) has a fixed ratio of 999:1. The test optical fibers are two passive optical fibers with optical fiber connectors at one end, and the two models are HI1060 and HI1060FLEX.

[0082] Weld two passive optical fibers with optical fiber connectors at both ends together in the AUTO mode of the fusion splicer, and calculate the insertion loss and return loss of the melting point. After cutting off the melting point, modify the fusion parameters and weld again, and calculate the insertion loss and return loss of the melting point.

[0083] Calculations show that, compared with the AUTO mode, using the optimized best splicing parameters, the insertion loss is reduced by 0.47dB and the return loss is reduced by 0.59dB.

[0084] The above tests show that the device can be used to optimize the welding parameters and is also suitable for optimizing the welding parameters of unknown optical fibers.

[0085] Embodiment 5: When the optical fiber is an optical fiber without an optical fiber connector, it is necessary to fusion-splice the optical fiber connector before testing, and the fusion loss of the optical fiber connector is used as a fixed variable; and an optimal fusion parameter test is performed between two optical fibers.

[0086] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A device for measuring the quality of passive optical fiber fusion splicing, comprising an optical fiber to be tested, wherein the optical fiber to be tested is made by fusion splicing two passive optical fibers, and a melting point is formed at the fusion splicing point, characterized in that: It also includes a light source generator, a beam splitter, a circulator, a first photodetector, a second photodetector and a third photodetector; the first photodetector is connected to the beam splitter, the second photodetector is connected to the circulator; one end of the optical fiber to be tested is connected to the output end of the circulator, and the other end is connected to the third photodetector; Among them, the light source generator emits a light signal, the light signal enters the beam splitter, and the light is divided into two paths by the beam splitter. One path of light is transmitted to the first photodetector for monitoring the light intensity of the beam split by the beam splitter; the other path of light is transmitted to the circulator and transmitted to the optical fiber to be tested through the circulator; the backscattered light generated by the optical fiber to be tested is transmitted to the second photodetector through the circulator to monitor the backscattered luminosity of the optical fiber to be tested; the light is transmitted to the third photodetector through the optical fiber to be tested to monitor the transmitted light intensity of the optical fiber to be tested.

2. A passive optical fiber fusion quality measuring device according to claim 1, characterized in that: The output ends of the third photoelectric detector and the circulator are both provided with optical fiber flange interfaces.

3. A passive optical fiber fusion quality measuring device according to claim 2, characterized in that: Optical fiber connectors are installed at both ends of the optical fiber to be tested, which are used to connect with the optical fiber flange interface.

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