# US 10,502,898 B2 · Chiral fiber circular polarizer

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- Number: US 10,502,898 B2
- Document ID: US10502898B2
- Status: Granted
- Kind: B2
- Application number: 13/354,666
- Filed: 2012-01-20
- Published: 2012-07-26
- Granted: 2019-12-10
- Earliest claimed: 2011-01-20
- Assignees: Chiral Photonics, Inc.
- Applicants: Victor Il'ich Kopp
- Inventors: Victor Il'ich Kopp
- Web page: https://patentgrep.com/patent/US10502898B2

## CPC

- G02B 6/274: {based on light guide birefringence, e.g. due to coupling between light guides (G02B6/105, G02B6/024 take precedence; mechanically induced birefringence G02F1/0134)}
- G02B 6/276: {Removing selected polarisation component of light, i.e. polarizers}
- G02B 6/024: with polarisation maintaining properties
- G02B 6/105: {having optical polarisation effects}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The inventive circular chiral fiber polarizer is operable to convert linearly polarized light to circularly polarized light, may be advantageously fabricated in an “in-fiber” manner and to comprise desirable extinction ratio characteristics, and may also serve as an interface between a sequentially positioned polarization maintaining (PM) fiber, and a single mode (SM) fiber.

## Claims

### Claim 1

An optical chiral circular fiber polarizer comprising:
a linear-polarization maintaining (PM) optical fiber section having a first PM end and a second PM end;
a sequentially positioned single mode (SM) optical fiber section having a first SM end and a second SM end; and
connection means for connecting said second PM end to said first SM end, such that said sequentially positioned and connected PM and SM optical fiber sections thereby form a continuous polarizer fiber, wherein said continuous polarizer fiber is axially twisted, within a predefined twisting region along its longitudinal axis, in accordance with a predefined twist profile, and wherein said predefined twisting region comprises a first region end disposed between said first PM end and said second PM end, and also comprises a second region end positioned between said first SM end and said second SM end.

### Claim 2 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said predefined twist profile comprises a uniformly twisted region.

### Claim 3 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said connection means comprises a fusion splice.

### Claim 4 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said predefined twist profile comprises a twist acceleration region, configured in accordance with a power function.

### Claim 5 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said linear-polarization maintaining optical fiber section comprises a PANDA fiber.

### Claim 6 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said SM optical fiber section comprises a conventional SMF fiber.

### Claim 7 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said predefined twist profile is configured to achieve a maximum extinction ratio.

### Claim 8 (depends on 1)

The optical chiral circular fiber polarizer of claim 1, wherein said predefined twist profile is configured to achieve a minimum extinction ratio.

### Claim 9

An optical chiral circular fiber polarizer comprising:
a linear-polarization maintaining (PM) optical fiber section having a first PM end and a second PM end;
a single mode (SM) optical fiber section having a first SM end and a second SM end; and
a connection between said PM optical fiber section and said SM optical fiber section, wherein according to a twist profile, said polarizer is configured to be axially twisted from a first region disposed between said first PM end and said second PM end, through the connection, and to a second region disposed between said first SM end and said second SM end to convert linearly polarized light to circularly polarized light.

### Claim 10 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said twist profile comprises a uniformly twisted region.

### Claim 11 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said connection comprises a fusion splice.

### Claim 12 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said twist profile comprises a twist acceleration region, configured in accordance with a power function.

### Claim 13 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said linear-polarization maintaining optical fiber section comprises a PANDA fiber.

### Claim 14 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said SM optical fiber section comprises an SMF fiber.

### Claim 15 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said twist profile is configured to achieve an increased extinction ratio.

### Claim 16 (depends on 9)

The optical chiral circular fiber polarizer of claim 9, wherein said twist profile is configured to achieve a reduced extinction ratio.