# US 2019/0170610 A1 · Method and system for multi-fiber cable testing

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- Number: US 2019/0170610 A1
- Document ID: US20190170610A1
- Status: Published application
- Kind: A1
- Application number: 15/950,709
- Filed: 2018-04-11
- Published: 2019-06-06
- Earliest claimed: 2017-12-01
- Assignees: EXFO Inc.
- Applicants: EXFO Inc.
- Inventors: Stephane PERRON; Daniel GARIEPY; Nicolas CARON; Robert BARIBAULT; Vincent RACINE
- Web page: https://patentgrep.com/patent/US20190170610A1

## CPC

- G01M 11/33: {with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face}
- G02B 6/385: {Accessories for testing or observation of connectors (means for centering or aligning the light guide within the ferrule with auxiliary facilities for movably aligning or adjusting the fibre within its ferrule, measuring position, eccentricity G02B6/3843; mechanical features associated with the optical testing of optical fibres G01M11/088)}
- H04B 10/0731: {Testing or characterisation of optical devices, e.g. amplifiers}
- G02B 6/3885: {Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type (optical ribbon cable G02B6/4403, G02B6/448)}
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04B: TRANSMISSION

## Abstract

There is provided a method, system and image capture device for determining a polarity of a multi-fiber cable link comprising a plurality of optical fiber links each connected between a first multi-fiber connector and a second multi-fiber connector, according to said polarity. Test light is injected into one or more of the optical fiber links via corresponding injection ports of the first multi-fiber connector, in accordance with a defined injection pattern; at least one polarity-testing image of the second multi-fiber connector is generated in which test light exiting at least one of the optical fiber links through one or more exit ports of the second multi-fiber connector is imaged as one or more spotlight spots in the polarity-testing image; and the polarity of the multi-fiber cable link is determined based on a pattern of said one or more spotlight spots in said polarity-testing image.

## Claims

### Claim 1

A test method for determining a polarity of a multi-fiber cable link comprising a plurality of optical fiber links each connected between a first multi-fiber connector at a first end and a second multi-fiber connector at a second end, according to said polarity, the test method including:
injecting test light into one or more of the optical fiber links via corresponding injection ports of the first multi-fiber connector, in accordance with a defined injection pattern;
generating at least one polarity-testing image of the second multi-fiber connector in which test light exiting at least one of the optical fiber links through one or more exit ports of the second multi-fiber connector is imaged as one or more light spots in said polarity-testing image; and
determining the polarity of the multi-fiber cable link based on a pattern of said one or more light spots in said polarity-testing image.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein test light is injected into the optical fiber links in accordance with a defined intensity level injection pattern; and wherein the polarity of the multi-fiber cable link is determined based on an intensity pattern of said one or more light spots in said polarity-testing image.

### Claim 3 (depends on 2)

The method as claimed in claim 2, further comprising: determining a continuity of said optical fiber links of the multi-fiber cable link based on presence of light spots in the at least one polarity-testing image.

### Claim 4 (depends on 2)

The method as claimed in claim 2, further comprising: generating at least one inspection image in which one or more optical fiber endfaces of the second multi-fiber connector are imaged and in which light spots from test light are absent.

### Claim 5 (depends on 4)

The method as claimed in claim 4, further comprising: determining respective positions of said one or more optical fiber endfaces in said inspection image; and wherein determining the polarity of the multi-fiber cable link comprises estimating an intensity level of light associated with each said positions to determine therefrom the intensity pattern of said one or more light spots associated with said optical fiber endfaces.

### Claim 6 (depends on 4)

The method as claimed in claim 4, wherein an illumination source projects illumination light onto the second multi-fiber connector when generating said inspection image and wherein the illumination source is turned off for generating said polarity-testing image.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein test light is injected into one or more of the optical fiber links in accordance with a defined injection pattern and a cyclic emission sequence comprising active periods during which said test light is active, and inactive periods during which said test light is inactive; and further comprising: detecting an inactive period of said test light during which light spots from test light are absent; and during said inactive period, generating at least one inspection image of the second multi-fiber connector in which one or more optical fiber endfaces of the second multi-fiber connector are imaged.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein test light is injected into each of the optical fiber links and wherein the method further comprises determining a continuity of said optical fiber links of the multi-fiber cable link based on presence of light spots in the at least one polarity-testing image.

### Claim 9 (depends on 7)

The method as claimed in claim 7, further comprising: determining respective positions of said one or more optical fiber endfaces in said inspection image; and wherein determining the polarity of the multi-fiber cable link comprises estimating an intensity level and/or a spectral content of light associated with each said positions to determine therefrom the pattern of said one or more light spots associated with said optical fiber endfaces.

### Claim 10 (depends on 7)

The method as claimed in claim 7, wherein each said active periods comprises a polarity-testing period during with test light is injected into a subset of one or more optical fiber links to define an injection pattern, and a continuity-testing period during which test light is injected in all optical fiber links.

### Claim 11

An image capture device for determining a polarity of a multi-fiber cable link comprising a plurality of optical fiber links each connected between a first multi-fiber connector at a first end and a second multi-fiber connector at a second end, according to said polarity, the image capture device to be used with a source assembly configured to inject test light into one or more of the optical fiber links via corresponding injection ports of the first multi-fiber connector, in accordance with a defined injection pattern, the image capture comprising:
an image sensor configured to capture images of the second multi-fiber connector and configured to generate at least one polarity-testing image of the second multi-fiber connector in which test light exiting at least one of the optical fiber links through one or more of exit ports of the second multi-fiber connector is imaged as one or more light spots in said polarity-testing image, a pattern of said one or more light spots in said image being indicative of the polarity of the multi-fiber cable link.

### Claim 12 (depends on 11)

The image capture device as claimed in claim 11, further comprising an image processor configured for analyzing the inspection image to identify the polarity of the multi-fiber cable link based on an intensity pattern of said one or more light spots in said polarity-testing image and determine a continuity of optical fiber links of the multi-fiber cable link based on presence of light spots at least one polarity-testing image.

### Claim 13 (depends on 12)

The image capture device as claimed in claim 12, further comprising a portable housing, an imaging system and an illumination source accommodated in the portable housing, and a probe tip configured to be coupled to the second multi-fiber connector to provide an optical path between the cable link under test and the imaging system.

### Claim 14 (depends on 11)

A system comprising the image capture device of claim 11 and said source assembly.

### Claim 15 (depends on 14)

The system as claimed in claim 14, wherein said source assembly is configured to inject test light into the optical fiber links in accordance with a defined intensity level injection pattern; and wherein an intensity pattern of said one or more light spots in said polarity-testing image is indicative of the polarity of the multi-fiber cable link.

### Claim 16 (depends on 15)

The system as claimed in claim 15, further comprising an image processor configured for analyzing the polarity-testing image to identify the polarity of the multi-fiber cable link based on an intensity pattern of said one or more light spots in the at least one polarity-testing image and determine a continuity of optical fiber links of the multi-fiber cable link based on presence of light spots in the at least one polarity-testing image.

### Claim 17 (depends on 16)

The system as claimed in claim 16, wherein the image processor is further configured for determining respective positions of said one or more optical fiber endfaces on said at least one inspection image; and determining the polarity of the multi-fiber cable link comprises estimating an intensity level of light associated with each said positions to determine therefrom the intensity pattern of said one or more light spots associated with said optical fiber endfaces.

### Claim 18 (depends on 14)

The system as claimed in claim 14, wherein the source assembly comprises one or a plurality of distinct optical sources for generating the test light as one more test optical signals.

### Claim 19 (depends on 14)

The system as claimed in claim 14, wherein said image sensor comprises one of a charge-coupled device (CCD) sensor and a complementary metal-oxide-semiconductor (CMOS).

### Claim 20 (depends on 13)

The system as claimed in claim 13, further comprising a controller to control the activation of the illumination source and so as to turn off the illumination source when capturing the at least one polarity-testing image.

### Claim 21 (depends on 14)

The system as claimed in claim 14, wherein test light is injected into one or more of the optical fiber links in accordance with a defined injection pattern and a defined cyclic emission sequence comprising active periods during which said test light is activate, and inactive periods during which said test light is inactive; and wherein the image capture device further comprises an image processor configured for detecting an inactive period of said test light during which light spots from test light are absent; and a controller configured for, during said inactive period, triggering a capture of at least one inspection image of the second multi-fiber connector in which one or more optical fiber endfaces of the second multi-fiber connector are imaged.

### Claim 22 (depends on 21)

The system as claimed in claim 21, wherein test light is injected into each of the optical fiber links and wherein the image processor is further configured for determining a continuity of said optical fiber links of the multi-fiber cable link based on presence of light spots in the at least one polarity-testing image.

### Claim 23 (depends on 21)

The system as claimed in claim 21, wherein the image processor is further configured for determining respective positions of said one or more optical fiber endfaces on said inspection image; and for estimating an intensity level and/or a spectral content of light associated with each said positions to determine therefrom the pattern of said one or more light spots associated with said optical fiber endfaces.

### Claim 24 (depends on 21)

The system as claimed in claim 21, wherein each said active periods comprises a polarity-testing period during with test light is injected into a subset of one or more optical fiber links to define an injection pattern, and a continuity-testing period during which test light is injected in all optical fiber links.