# US 2014/0152979 A1 · Quad optical time domain reflectometer (otdr)

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- Number: US 2014/0152979 A1
- Document ID: US20140152979A1
- Status: Published application
- Kind: A1
- Application number: 14/143,865
- Filed: 2013-12-30
- Published: 2014-06-05
- Earliest claimed: 2009-12-04
- Assignees: AFL Telecommunications LLC
- Inventors: Dennis FLORA; Scott PRESCOTT; Dale EDDY; Jianxun FANG
- Web page: https://patentgrep.com/patent/US20140152979A1

## CPC

- G01M 11/3154: {Details of the opto-mechanical connection, e.g. connector or repeater}
- G01M 11/088: {of optical fibres; Mechanical features associated with the optical testing of optical fibres}
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

An optical device that includes a first laser source, a multimode coupler optically connected to the first laser source, a first test port optically connected to the multimode coupler, a second laser source, a singlemode coupler optically connected to the second laser source, a second test port optically connected to the singlemode coupler, a photodetector, and a multimode/singlemode combiner optically connected to the multimode coupler, singlemode coupler and photodetector.

## Claims

### Claim 1

An optical device comprising:
a first laser source;
a multimode coupler optically connected to the first laser source;
a first test port optically connected to the multimode coupler;
a second laser source;
a singlemode coupler optically connected to the second laser source;
a second test port optically connected to the singlemode coupler;
a photodetector;
and a multimode/singlemode combiner optically connected to the multimode coupler, singlemode coupler and photodetector.

### Claim 2 (depends on 1)

The optical device of claim 1, wherein:
the first laser source is a multimode fiber coupled laser source;
the first test port is a multimode test port;
the second laser source is a singlemode fiber coupled laser source;
and the second test port is a singlemode test port.

### Claim 3 (depends on 1)

The optical device of claim 1, wherein:
the multimode coupler is optically connected to the first laser source through an optical splice with a radial offset.

### Claim 4 (depends on 3)

The optical device of claim 3, wherein:
the radial offset is approximately 10 μm.

### Claim 5 (depends on 3)

The optical device of claim 3, wherein:
a first fiber that optically connects the first laser source to the optical splice has a length that is the same as a length of a second fiber that optically connects the optical splice to the multimode coupler.

### Claim 6 (depends on 5)

The optical device of claim 5, wherein:
the length is at least approximately 39 inches.

### Claim 7 (depends on 1)

The optical device of claim 1, further comprising:
a low back-reflection termination optically connected to the multimode coupler.

### Claim 8 (depends on 7)

The optical device of claim 7, wherein:
the low back-reflection termination is one of an angled cleave and an angled physical contact ferrule.

### Claim 9 (depends on 8)

The optical device of claim 8, wherein:
the angle is equal or greater than eight degrees.

### Claim 10 (depends on 1)

The optical device of claim 1, wherein:
the multimode coupler is a 2×2, 50:50 split ratio coupler.

### Claim 11 (depends on 10)

The optical device of claim 10, wherein:
the multimode coupler is an 850/1300 nm coupler.

### Claim 12 (depends on 1)

The optical device of claim 1, wherein:
the singlemode coupler is a 1×2, 50:50 split ratio coupler.

### Claim 13 (depends on 12)

The optical device of claim 12, wherein:
the singlemode coupler is a 1270 nm to 1650 nm wideband coupler.

### Claim 14 (depends on 1)

The optical device of claim 1, wherein:
the photodetector is an avalanche photodetector.

### Claim 15 (depends on 7)

The optical device of claim 7, wherein:
a first fiber that optically connects the multimode coupler to the first test port has a length that is the same as a length of a second fiber that optically connects the multimode coupler to the low back-reflection termination.

### Claim 16 (depends on 15)

The optical device of claim 15, wherein:
the length is at least approximately 39 inches.

### Claim 17 (depends on 1)

The optical device of claim 1, wherein:
the multimode/singlemode combiner is a 1×2 combiner.

### Claim 18 (depends on 1)

The optical device of claim 1, wherein:
the multimode/singlemode combiner has a loss that is less than 2 dB.

### Claim 19 (depends on 1)

The optical device of claim 1, wherein:
the multimode/singlemode combiner has a loss that is approximately 1 dB or less.

### Claim 20 (depends on 1)

The optical device of claim 1, wherein:
the optical device is an optical time domain reflectometer.

### Claim 21

An optical device comprising:
a multimode laser source;
a 2×2, 50:50 split ratio multimode coupler optically connected to the multimode laser source;
a multimode test port optically connected to the multimode coupler;
a singlemode laser source;
a 1×2, 50:50 split ratio singlemode coupler optically connected to the singlemode laser source;
a singlemode test port optically connected to the singlemode coupler;
a photodetector; and
a multimode/singlemode combiner optically connected to the multimode coupler, singlemode coupler and photodetector.

### Claim 22 (depends on 21)

The optical device of claim 21, wherein:
the multimode coupler is an 850/1300 nm coupler and
the singlemode coupler is a 1270 nm to 1650 nm wideband coupler.

### Claim 23 (depends on 21)

The optical device of claim 21, wherein:
the multimode coupler is optically connected to the first laser source through an optical splice with a radial offset.

### Claim 24 (depends on 23)

The optical device of claim 23, wherein:
the radial offset is approximately 10 μm.

### Claim 25 (depends on 23)

The optical device of claim 23, wherein:
a first fiber that optically connects the first laser source to the optical splice has a length that is the same as a length of a second fiber that optically connects the optical splice to the multimode coupler.

### Claim 26 (depends on 25)

The optical device of claim 25, wherein:
the length is at least approximately 39 inches.

### Claim 27 (depends on 21)

The optical device of claim 21, further comprising:
a low back-reflection termination optically connected to the multimode coupler.

### Claim 28 (depends on 27)

The optical device of claim 27, wherein:
the low back-reflection termination is one of an angled cleave and an angled physical contact ferrule.

### Claim 29 (depends on 28)

The optical device of claim 28, wherein:
the angle is equal or greater than eight degrees.

### Claim 30 (depends on 21)

The optical device of claim 21, wherein:
the optical device is an optical time domain reflectometer.