KR101735356B1 - Non-contact type apparatus of measuring insertion loss of optical connector and method of measuring the loss - Google Patents

Non-contact type apparatus of measuring insertion loss of optical connector and method of measuring the loss Download PDF

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KR101735356B1
KR101735356B1 KR1020150139524A KR20150139524A KR101735356B1 KR 101735356 B1 KR101735356 B1 KR 101735356B1 KR 1020150139524 A KR1020150139524 A KR 1020150139524A KR 20150139524 A KR20150139524 A KR 20150139524A KR 101735356 B1 KR101735356 B1 KR 101735356B1
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image
insertion loss
optical
optical fiber
optical connector
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KR20170040490A (en
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김병재
유광수
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주식회사 덕인이엔씨
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0004—Industrial image inspection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10004—Still image; Photographic image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10024—Color image

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Abstract

A non-contact insertion loss measuring device and its measuring method for an optical connector capable of easily and quickly measuring the insertion loss while preventing damage to the cross section of the ferrule and the optical fiber are presented. The apparatus and method include a light source irradiating unit including a light output unit for applying a visible light having a wavelength of 380 nm to 780 nm to an end face of an optical fiber connected to an incident short optical connector and a cross section equipped with a camera for acquiring an image emitted from the optical fiber and converting the image into image data And a vision analyzer that roughly estimates the insertion loss of the optical fiber by analyzing the area size and color value of the inspection unit and the image, and comparing the area size and the color value of the reference value set in advance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-contact insertion loss measuring apparatus and a measuring method thereof,

The present invention relates to an optical connector insertion loss measuring apparatus and an insertion loss measuring method, and more particularly to a device for measuring an insertion loss by a non-contact method for analyzing an image of a cross section of an optical fiber patch cord ferrule, .

Optical fiber, optical connector, optical coupler, optical isolator, optical amplifier, and optical transceiver module are the core components for realizing the high-speed information communication network. Optical connectors are used for optical fiber and optical fiber, optical fiber and parts, It is used as a means for connecting optical fibers. In particular, the optical connector is important in terms of the cross-sectional state of the optical fiber and ferrule for interconnection with a mechanical connector. The optical connector aligns the ferrule inserted with the optical fiber core cut according to a predetermined parameter, aligns the center axis of the optical fiber, and performs bonding and polishing processes to minimize optical loss. Optical connectors such as SC, FC, ST, LC, MU, MTRJ, E-2000 and multi-core MPO are used for optical patch cords in which optical connectors are connected to both ends of a ferrule.

Optical fiber insertion loss measurement methods generally include transmission measurement method using optical power meter and optical time-domain reflectometer (OTDR) back scattering method. The transmission measurement method measures the amount of optical loss generated by installing the optical power meter at both ends of the optical fiber or optical connector to be measured at the optical power ratio. The cutting method to measure the optical fiber to be measured is most accurate because it measures the optical power by cutting the optical fiber to be measured at the incident end. However, cutting the optical fiber at the incident end and alignment of the optical fiber axis are difficult and difficult to use. The insertion method, which is mainly used, is a method of inserting a light source into an incident end and attaching an optical connector to the measured optical fiber, measuring the optical power of the incident end and the output end, and comparing the power difference.

The optical fiber patch cord has insertion loss due to various external factors such as uniformity of the optical fiber medium, scattering of light, and the like. One of the most important insertion loss is caused by nonuniformity in the optical connector connection section. The nonuniformity of the optical connector cross section may include scratching of the surface due to poor polishing of the ferrule, damage to the optical fiber, attachment of foreign matter, and the like. Usually, the measurement of the optical insertion loss is performed after checking the optical connector cross section and checking for the presence or absence of a defect. However, in the conventional transmission measurement method, the cross-section of the ferrule and the optical fiber is damaged, and the method of measuring the insertion loss is complicated and takes a long time.

In the back scattering method, optical loss is measured by using a phenomenon in which a part of light propagated in the optical fiber core is returned to the incident side by the reflection of the Fresnel reflection and the Rayleigh scattering by using the OTDR. Loss, disconnection, and location of anomalies can be measured. In the case of the OTDR backscattering method, for example, a method of utilizing a dummy optical fiber is disclosed in Korean Patent Laid-Open Publication No. 2013-0136604. The back scattering method is mainly used to measure the presence or absence of abnormality in the optical fiber communication line at medium / long distance. Short distance measurement such as optical fiber patch cord can not be measured by the dead zone, Is very low.

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-contact insertion loss measuring apparatus and a measuring method thereof for an optical connector capable of easily and quickly measuring an insertion loss, while preventing the cross section of a ferrule and an optical fiber from being damaged.

A non-contact type insertion loss measuring apparatus of an optical connector includes a light source irradiating unit including a light output unit for applying a visible light having a wavelength of 380 nm to 780 nm to an end face of an optical fiber connected to an incident short optical connector, And a cross-sectional inspection unit equipped with a camera for acquiring and converting the image data into image data. The apparatus also includes a vision analyzer for approximating the insertion loss of the optical fiber by analyzing the area size and color value of the image and comparing the area size and color value of the image with a preset reference value.

In the apparatus of the present invention, the visible light may be generated by a laser diode. The incident end optical connector may be connected to an incident end connector jig provided in the light source irradiating portion. The image to be emitted can be obtained from an output-end optical connector connected to an output-end connector jig provided in the cross-section inspecting section. The reference value represents the area size and the color value as an X / Y graph, and the insertion loss corresponding to the X / Y graph is calculated.

According to another aspect of the present invention, there is provided a method of measuring a non-contact insertion loss of an optical connector, comprising: obtaining an image emitted from an end face of an optical fiber to which visible light of 380 nm to 780 nm is applied. The image is then corrected and converted into image data that can be analyzed by a vision analyzer. And sets an optical fiber core region that is a central region of the image from the image data. The area size and color value of the center area are calculated. The area size and the color value are compared with the area size and the color value of the preset reference value. An approximation of the insertion loss of the cross section of the optical fiber is estimated by the above comparison.

In the method of the present invention, the color value may be calculated as any one of RGB, HSL and CLE. The reference value is obtained by obtaining an image of a plurality of optical connectors having different insertion loss and constructing an insertion loss corresponding to the extracted region size (X) and color value (Y) for each image. The reference value has a constant slope or curvature X < / RTI >

According to the non-contact insertion loss measuring device and the measuring method of the optical connector of the present invention, by analyzing and comparing the image of the measured optical connector with the measurement wavelength of the visible light band and estimating the insertion loss, And the insertion loss can be measured simply and quickly.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view of a non-contact insertion loss measuring apparatus of an optical connector according to the present invention.
FIG. 2 is a photograph showing the images of optical fibers obtained according to the wavelengths applied to the single fiber optical connector according to the present invention.
3 is a photograph showing an image of an optical fiber obtained according to a wavelength according to an embodiment of the present invention in a multi-fiber optical connector applied to the present invention.
4 is a flowchart illustrating a method for measuring a non-contact insertion loss of an optical connector according to the present invention.
FIG. 5 is a graph showing the insertion loss based on the number of pixels at a predetermined brightness or more in the region of RGB-Red in the measurement method of FIG.
6 is a view for explaining a process of setting image coordinates and regions by the vision analyzer of the present invention.
7 is an image for explaining a process of estimating insertion loss by the vision analyzer of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

The embodiment of the present invention analyzes the image of the optical connector under measurement with the measurement wavelength of the visible light band to estimate the insertion loss to prevent damage to the cross section of the ferrule and the optical fiber, A non-contact insertion loss measuring apparatus and a measuring method therefor are proposed. To this end, the structure of the non-contact insertion loss measuring apparatus will be described in detail, and a method of measuring the insertion loss will be described in detail. The optical patch cord of the present invention is an optical patch cord in which optical connectors are connected to both ends of a ferrule and optical connectors such as SC, FC, ST, LC, MU, MTRJ, E-2000, have.

1 is a view schematically showing an apparatus for measuring a non-contact insertion loss of an optical connector according to an embodiment of the present invention.

1, the measuring apparatus of the present invention comprises a tester 10, an information transmission line 20, and a vision analyzer 30. As shown in Fig. The inspecting device 10 is a device for inspecting the insertion loss of the optical connector in a noncontact manner and the information transmission line 20 is a cable through which the inspected image data and control information are transmitted. To estimate the insertion loss. The tester 10 includes a light source irradiating unit 14 and a cross-section inspecting unit 16 built in the case 12. [ The light source irradiated to the ferrule 44 in the light source irradiating unit 14 uses a visible light band (380 nm to 780 nm). This will be described in detail later with reference to FIG. 2 and FIG.

The light source irradiating unit 14 includes a light source control unit 14a, a light output unit 14b, and an incident end connector jig 14c. Here, the connector jig 14c is a structure in which the incident end optical connector 42a at one side of the optical patch cord 40 is inserted. The connector jig 14c aligns and fixes the center position of the incident end optical connector 42a in order to apply the light source to the incident end optical connector 42a. The structure of the connector jig 14c differs depending on the type of the incident end optical connector 42a. The light output section 14b is a light emitting diode for generating visible light, and is preferably a laser diode. The optical output part 14b differs in kind and structure depending on the wavelength and power to be output. The wavelength and power of the light output section 14b are adjusted by using the light source control section 14a.

The cross-section inspection unit 16 includes a camera 16a, a barrel 16b, a focusing lens 16c, and an output-end connector jig 16d. The connector jig 16d is a structure in which the output end optical connector 42b on the other side of the optical patch cord 40 is inserted. The connector jig 16d sets and fixes the center position of the output end optical connector 42b in order to collect an image from the output end optical connector 42b. The structure of the connector jig 16d differs depending on the type of the outgoing-end optical connector 42b. The focusing lens 16c focuses the image from the output-end optical connector 42b, and in some cases, the lenses having different focal lengths may be arranged. The lens barrel 16b maintains a constant distance between the focusing lens 16c and the camera 16a.

The camera 16a photographs an image of the outgoing optical connector 42b through the barrel 16b, and the collected image is converted into image data through a predetermined process. The image data is in a form that can be analyzed in the vision analyzer 30. To this end, a device employing a protocol for converting the image data into the camera 16a may be added. A detailed description thereof will be omitted here since the camera 16a can acquire images and transform the known well-known processes. The image data is transmitted to the vision analyzer 30 by the information transmission line 20. The camera 16a applied to the embodiment of the present invention allows the user to visually confirm the image of the visible light band.

The insertion loss measuring apparatus according to the embodiment of the present invention measures the insertion loss in two aspects. The first is whether or not the optical fiber in the ferrule 44 is cut. When the optical fiber is cut, the image of the central region of the optical fiber appears as black. The second is the insertion loss state of the optical fiber. The process of evaluating the insertion loss state will be described in detail below.

FIG. 2 is a photograph showing a comparison of images of optical fibers obtained according to the wavelengths applied to the single fiber optical connector applied to the embodiment of the present invention. 3 is a photograph showing an image of an optical fiber obtained according to the wavelength according to the embodiment of the present invention in a multi-fiber optical connector applied to an embodiment of the present invention.

According to FIG. 2, when the light source is not applied or a light source of 1,550 nm is applied, (a) fails to acquire an image. In addition, when a light source of 1,310 nm was applied, a faint image was obtained in (b). On the other hand, in consideration of optical dispersion and optical loss, optical communication mainly uses the band of 1,310 nm or 1,550 nm. However, since the light source of the band can not obtain an image or acquires a faint image, it can not be applied to the insertion loss measuring apparatus according to the embodiment of the present invention. On the other hand, when a light source of 640 nm, which is a red light, was applied (c), the collected image could accurately obtain the size (area) and color value. Accordingly, the insertion loss measuring apparatus according to the embodiment of the present invention applies visible light of 380 ~ 780nm band which can be visually confirmed.

Referring to FIG. 3, when red light of 680 nm is applied, the left side shows the image of the multi-core connector, and the right side shows the image of any one of the optical fibers selected from the multi-core connector. At this time, the image was taken with a black and white CCD camera, and the core region at the center of the ferrule can be visually confirmed. Accordingly, like the single-core connector, the multichannel connector applies visible light in the 380-780 nm band as the light source to be applied. The image is an image that is photographed by a monochrome camera and is not divided into red light (640 nm), and the loss value is deduced from the color value to the size of the area that is progressed through the optical fiber core.

4 is a flowchart illustrating a method for measuring a non-contact insertion loss of an optical connector according to an embodiment of the present invention. FIG. 5 is a graph showing the insertion loss based on the number of pixels at a predetermined brightness or more in the region of RGB-Red in the measurement method of FIG. At this time, the insertion loss measuring apparatus will be described with reference to Fig.

According to Fig. 4, the non-contact insertion loss measuring method first connects the incident end optical connector 42a of the optical patch cord 40 to the connector jig 14c for receiving the insertion loss. At this time, the incident end optical connector 42a is aligned and connected to the center. Then, visible light (380 to 780 nm) is applied from the light output section 14b to the incident end optical connector 42a (S10). At this time, the wavelength and the output of the light output section 14b are controlled by the light source control section 14a. Thereafter, the cross-section of the output end optical connector 42b of the optical patch cord 40 connected to the connector jig 16d with its center aligned is inspected (S12). The cross-sectional inspection refers to that the image emitted from the output-side optical connector 42b is picked up by the camera 16a via the focusing lens 16c and the lens barrel 16b, and is converted into image data.

Then, the cross-sectional image data is transmitted to the vision analyzer 30 by the information transmission line 20 (S14). The vision analyzer 30 collects and corrects the received image data (S16). Then, the center area of the image is set using the corrected image data (S18). Since the center area has a color value and an area size value, the vision analyzer 30 acquires information on the color value and the area size value (S20). The acquisition value of the obtained color and area size is compared with the reference value of the color and area size set in advance and analyzed (S22). Here, the reference value is expressed by an X / Y graph having a slope and a curvature with constant region size (X) and hue value (Y).

Through the vision analysis, it is possible to obtain the number of pixels and the color value exceeding the brightness area size and the in-area setting threshold value over a predetermined period, and based on this, the reference data for the actual insertion loss is preceded by the construction of the reference data. The reference value may be changed to red, green, and blue depending on the light source, and may be established based on the illuminance.

Referring to FIG. 5, if the actual insertion loss is measured based on the number of pixels exceeding a predetermined brightness in the size region and the color RGB value and constructed as a reference value, it can be expressed as a graph as shown in FIG. At this time, the graph may be different according to the light source and the reference, and the illuminance may be a reference. The reference value is constructed by repeating a large number of optical fiber patch cords with insertion loss at each step, taking into account reproducibility and uncertainty. It may be RGB, illuminance, brightness, saturation, etc., which are identified by the color value as a criterion for estimating the insertion loss, and the number of pixels exceeding the area size or the constant brightness in the area. At this time, the brightness can be confirmed based on the threshold value. The connector cross-sectional image is then collected, analyzed, and compared to a reference value to calculate insertion loss.

The color values can be applied to HSL, CLE, RGB, and the like. The HSL is determined based on hue, saturation, and brightness. The CLE is based on the amount of light and chromaticity, and the amount of brightness of the color represents the chromaticity by the coordinates of x, y. The RGB represents a mixture of red, green, and blue, which are three primary colors of light. Finally, the insertion loss is determined from the acquired value which is compared with the reference value and is displayed (S24). The reference value is constructed by comparing the area size and the color value with the optical insertion loss, and is represented by an X / Y graph having a constant slope and a curvature.

FIG. 6 is a view for explaining a process of setting image coordinates and regions with the vision analyzer 30 of the embodiment of the present invention. Here, an image sent from an MPO, which is a multicore optical connector, is taken as an example.

According to FIG. 6, the vision analyzer 30 has expanded the image of the collected MPO optical connector using Visa Builder for Automated Inspection (VBAI), which is vision software of National Instruments (NI). The VBAI analyzes the image based on RGB. The setup process first captures the optical fiber image from the image enlarged by VBAI (a). Then, the center C is confirmed in the captured optical fiber image and the coordinates are set (b). In the coordinate-set image, the image area F is set (c). Next, the function of analyzing arbitrarily acquired images is possible (d). That is, the VBAI sets and analyzes coordinates, areas, and color values of an image.

7 is an image for explaining a process of estimating insertion loss by the vision analyzer 30 of the embodiment of the present invention. In this process, a part of the process of estimating the insertion loss is constructed by DB, and the color (RGB) value is extracted to the optical fiber core portion which is the center of the optical fiber precisely. That is, it is possible to extract a color (RGB) value or a brightness (roughness) value in a predetermined area of the collected image.

According to Fig. 7, the vision analyzer 30 controls and displays the RGB graph, the RGB average value and the standard deviation, etc. in order to estimate the insertion loss. The vision analyzer 30 first extracts a reference value that can be compared. For example, when applying red light (640 nm), the image collected through the camera 16a extracts the red region size and color value transmitted through the central core of the optical fiber. The reference value is obtained by obtaining an image of a plurality of optical connectors having different optical insertion loss and constructing an insertion loss corresponding to the extracted area size (X) and color value (Y) for each image. The reference value is a constant slope or curvature Gt; X / Y < / RTI >

In the insertion loss measurement according to the embodiment of the present invention, an image is measured on a measured optical connector, and an actual insertion loss is estimated approximately by comparing an area size and a color value of the reference value with each other. The estimated insertion loss is displayed on the screen of the vision analyzer 30. For example, when the insertion loss of an arbitrary optical connector is estimated using a visible light camera and red light, when the red light region size is 8.1 탆 and the RGB color value (red) is 200, To estimate the insertion loss. That is, the area size X and the color value Y of the reference value having an area size of 8.1 mu m and an RGB color value red close to 200 are confirmed, and the corresponding insertion loss is estimated.

The insertion loss measuring method according to the embodiment of the present invention does not cause damage to the end face of the ferrule and the optical fiber, and the method of measuring the insertion loss is simple, and the measurement time is short. That is, since the insertion loss is estimated by comparing the approximate values among the reference values already established, the measurement method is simple and the measurement time is short. Further, since the optical connector is inserted and measured at the incident end and the output end connector jig without cutting the optical fiber, damage of the cross section of the ferrule and the optical fiber does not occur.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. It is possible.

10; Tester 12; case
14; A light source irradiating unit 14a; The light-
14b; A light output section 14c; Incident end connector jig
16; Section inspection portion 16a; camera
16b; A barrel 16c; Focusing lens
16d; An output end connector jig 20; Information transmission line
30; Vision analyzer 40; Optical patch cord
42a; An incoming short optical connector 42b; Outgoing optical connector
44; Ferrule

Claims (8)

A light source irradiating section including a light output section for applying visible light having a wavelength of 380 nm to 780 nm to an end face of an optical fiber connected to an incident end optical connector connected to the incident end connector jig;
A cross-sectional inspection unit having a camera for acquiring an image emitted from the optical fiber and converting the image into image data; And
And a vision analyzer for approximating the insertion loss of the optical fiber by analyzing the area size and the color value of the image and comparing the area size and the color value of the image with the area size and the color value of the preset reference value,
Characterized in that the image to be emitted is obtained from an output end optical connector connected to an output end connector jig provided in the cross section inspecting unit and a ferrule including an optical fiber is positioned between the input end optical connector and the output end optical connector Non-contact insertion loss measuring device of optical connector. The apparatus of claim 1, wherein the visible light is generated by a laser diode. delete delete 2. The apparatus of claim 1, wherein the reference value represents the area size and the color value in an X / Y graph, and the insertion loss corresponding to the X / Y graph is calculated. A visible light having a wavelength of 380 nm to 780 nm is applied from an optical output section to an end face of an optical fiber connected to an incident end optical connector connected to the incident end connector jig, Obtaining from an inspection unit;
Correcting the image and converting it into image data that can be analyzed by a vision analyzer;
Setting a central region of the image from the image data;
Calculating an area size and a color value of the center area;
Comparing the area size and the color value with an area size and a color value of a preset reference value; And
And estimating an approximation of an insertion loss of the optical fiber cross section by the comparison,
And a ferrule including the optical fiber is positioned between the incident end optical connector and the output end optical connector. 7. The method of claim 6, wherein the hue value is calculated as any one of RGB, HSL, and CLE. 7. The method of claim 6, wherein the reference value is obtained by obtaining an image of a plurality of optical connectors having different insertion loss and constructing insertion loss corresponding to the extracted region size (X) and color value (Y) , And is represented by an X / Y graph having a constant slope or curvature.
KR1020150139524A 2015-10-05 2015-10-05 Non-contact type apparatus of measuring insertion loss of optical connector and method of measuring the loss KR101735356B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220086033A (en) * 2020-12-16 2022-06-23 한국광기술원 Apparatus for optical fiber fusion splicing analysis and its analysis method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003021752A (en) 2001-07-05 2003-01-24 Sumitomo Electric Ind Ltd Optical connector measuring device and its measuring method
JP2012103204A (en) * 2010-11-12 2012-05-31 Anritsu Corp End face observation device and method for optical fiber connector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003021752A (en) 2001-07-05 2003-01-24 Sumitomo Electric Ind Ltd Optical connector measuring device and its measuring method
JP2012103204A (en) * 2010-11-12 2012-05-31 Anritsu Corp End face observation device and method for optical fiber connector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220086033A (en) * 2020-12-16 2022-06-23 한국광기술원 Apparatus for optical fiber fusion splicing analysis and its analysis method
KR102517633B1 (en) 2020-12-16 2023-04-04 한국광기술원 Apparatus for optical fiber fusion splicing analysis and its analysis method

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