CN2725912Y - Direction related optical fibre polarizer - Google Patents
Direction related optical fibre polarizer Download PDFInfo
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- CN2725912Y CN2725912Y CN 200420062821 CN200420062821U CN2725912Y CN 2725912 Y CN2725912 Y CN 2725912Y CN 200420062821 CN200420062821 CN 200420062821 CN 200420062821 U CN200420062821 U CN 200420062821U CN 2725912 Y CN2725912 Y CN 2725912Y
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- optical fiber
- polarizer
- mirror
- polarizing
- fiber polarizer
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Abstract
The utility model relates to the optical fiber sensing technique and the optical fiber communication technique, in particular to an optical fiber polarizer, comprising two collimators assembled according to the requirement of the light path of the polarizer, a polarizing mirror and a front and a back transmission optical fiber. The optical fiber polarizer also comprises two 45 degrees faraday rotators which are respectively arranged on the both sides of the polarizing mirror, two mirror faces of the two 45 degrees faraday rotators are respectively and tightly contacted with the mirror faces of the polarizing mirror and the collimators, the polarizing direction of the polarizing mirror and the polarizing direction of one transmitting direction form a 45 degrees, and the rotating directions of the two 45 degrees faraday rotators are opposite. The direction related optical fiber polarizer extends the property of the existing optical fiber polarizer so as to make the existing optical fiber polarizer have the non-reciprocal property and enlarge the using range of the existing optical fiber polarizer, and the direction related optical fiber polarizer can eliminate the latching problems of the laser wavelength on two directions when applied to an optical fiber ring laser; the direction related optical fiber polarizer is able to make the optical fiber system of the faraday rotating mirror keep the single polarization when being used and matched with a 90 degrees faraday rotating mirror, and if the direction related optical fiber polarizer is used and matched with a Sagnac ring, when an input light has different polarizing states and different impulse widths, the direction related optical fiber polarizer can make an output light have various different properties.
Description
Technical field
The utility model relates to optical fiber sensing technology and Fibre Optical Communication Technology, particularly a kind of optical fiber polarisation device.
Background technology
At present, fibre optic polarizer has been widely used in optical fiber measurement, Fibre Optical Sensor and the various polarization control system.Common fibre optic polarizer mainly is made up of optical fiber, collimating apparatus, polariscope.Light in the optical fiber becomes directional light by collimating apparatus, and the process polariscope enters Optical Fiber Transmission through collimating apparatus after rising partially again.Its working mechanism is to utilize polariscope that the light of a direction (as directions X) in the light is produced after the very high attenuation by filtering, and makes the optical attenuation of other direction (vertical Y direction with it) very little, is gone out by Optical Fiber Transmission after entering collimating apparatus smoothly.This polarizer and optical transmission direction are irrelevant.
Improvement to fibre optic polarizer in the prior art mainly focuses in the quality that improves product promptly how to reduce and insert loss or improve extinction ratio, and the stability that how further to guarantee its work.In the Chinese patent application 02217755.8 (crystal packaged polarization-maintaining fiber polarizer) a kind of new fibre optic polarizer is disclosed for example, it adopts optical fiber integration, realized inclined to one side characteristic with the crystal around the optical fiber, it still belongs to the fibre optic polarizer with reciprocity property.
Summary of the invention
The purpose of this utility model is, a kind of that have a characteristics of non-reciprocity and the relevant fibre optic polarizer of light transmission direction in optical fiber are proposed, promptly the forward transmitted direction (+Z axle) of light go up to certain together folk prescription rise partially to (X-axis), and when transmitting in the other direction, to former folk prescription to orthogonal directions (Y-axis) play inclined to one side fibre optic polarizer.
The purpose of this utility model is realized by following mode.
Directional correlation fibre optic polarizer of the present utility model, comprise two collimating apparatuss by polarizer light path requirement assembling, two Transmission Fibers in polariscope and front and back, it is characterized in that, also include two 45 ° of Faraday rotators, they are separately positioned on polariscopic both sides, its two minute surface closely contacts with the minute surface of polariscope and collimating apparatus respectively, wherein, the sense of rotation of described two 45 ° of Faraday rotators is opposite, and polariscopic folk prescription is at 45 to (X-axis) with a folk prescription of a certain transmission direction.
Directional correlation fibre optic polarizer of the present utility model, when the linearly polarized light of X-direction during along the forward transmitted direction (+Z axle) of light, enter polariscope for 45 ° through first 45 ° of Faraday rotator rotations, since with polariscopic folk prescription to identical, pass through so can hang down to decrease, and, make its polarization direction get back to directions X again through 45 ° of second 45 ° of Faraday rotators counter-rotatings; And orthogonal directions (Y-axis) linearly polarized light of the X-axis of edge+Z axle transmission through 45 ° of first 45 ° of Faraday rotators rotations after, be polarized that mirror is high to decrease filtering.If in the opposite direction the light of (Z axle) transmission is but opposite fully, this moment, the linearly polarized light of Y direction rotated 45 ° through second 45 ° of Faraday rotator, just with polariscopic folk prescription to identical and pass through smoothly, make the polarization direction go back to the Y direction again after passing through first 45 ° of Faraday rotators; And in that (Z) the directions X linearly polarized light of axle transmission is polarized that mirror is high to decrease filtering.
In actual applications, when needs transmission light plays the linear polarization half-twist of inclined to one side and light, can make the sense of rotation of two 45 ° of Faraday rotators identical.But this moment, its an inclined to one side characteristic and transmission direction were irrelevant.
Directional correlation fibre optic polarizer of the present utility model has been expanded the characteristic of fibre optic polarizer of the prior art, makes it to have characteristics of non-reciprocity, thereby has enlarged its usable range.For example, be applied in the optical fiber ring laser, can make the laser polarization state that produces on suitable in the ring cavity, contrary two directions is quadrature, thereby can remove the latch-up problem of optical maser wavelength on two directions.If unite use, then can make the fibre system of faraday rotation mirror keep single polarization with 90 ° of faraday rotation mirrors.Also can encircle the associating use, when input light has different polarization states and distinct pulse widths, can make output light that various different qualities are arranged with Sagnac.
Description of drawings
Fig. 1 is the embodiment synoptic diagram of fibre optic polarizer of the prior art.
Fig. 2 is the embodiment synoptic diagram of directional correlation fibre optic polarizer of the present utility model.
Embodiment
Referring to Fig. 2,1,7 is optical fiber transmission line, and they fuse with collimating apparatus 2,6 respectively with conventional method, 4 is polariscope general in the optics, 45 ° of Faraday rotators 3 and be located at polariscopic both sides in 5 minutes, the sense of rotation of two 45 ° of Faraday rotators is opposite, shown in arrow among the figure.Two minute surfaces of spinner 3 closely contact with collimating apparatus 2 and polariscope minute surface respectively.Two minute surfaces of spinner 5 closely contact with collimating apparatus 6 and polariscope minute surface respectively.Polariscopic folk prescription to X-axis angle at 45.When the linearly polarized light edge+Z of directions X axle transmits, change 45 ° through 45 ° of Faraday rotators 3 and enter polariscope, just in time be folk prescription to, low damage by after enter 45 ° of Faraday rotators 5, reverse 45 ° and make the polarization direction get back to directions X again; Simultaneously, the Y directional ray polarized light of edge+Z axle transmission is given the filtering of the high damage of polariscope after 45 ° of 45 ° of Faraday rotators, 3 rotations.See again (Z) situation of the light of axle transmission is but opposite fully, the linearly polarized light of Y direction through 45 ° of 45 ° of Faraday rotators, 5 rotations polariscopic folk prescription to and pass through smoothly, behind 45 ° of Faraday rotators 2, make the polarization direction go back to the Y direction again; Simultaneously, in that (Z) the directions X linearly polarized light of axle transmission has just been sponged.From the above mentioned, the light of right+Z transmission that this direction associated fiber polarizer has been realized rises partially at directions X, and to (Z) light of axle transmission rises in the Y direction partially.
Buy the loose mail of following specification from market: the collimating apparatus (FCO-B-S-131-0) of the φ 2.8mm that company of Kangshun Optical Communication Co., Ltd. produces, the polariscope of φ 2.4mm * 2.4mm, 45 ° of Faraday rotators (FR-155-025-0.5) and the general single mode fiber of φ 2.4mm * 2.4mm, be assembled into directional correlation fibre optic polarizer described in the utility model with conventional method according to present embodiment, standard according to existing reciprocity fibre optic polarizer is carried out relevant performance test to it, the result is as follows: operation wavelength λ=1550nm, insert loss 0.64dB, extinction ratio＞30dB.Test result shows, directional correlation fibre optic polarizer described in the utility model is in that to insert loss and extinction ratio all satisfactory, have simultaneously on different optical transmission direction, have different rise folk prescriptions to advantage.
In actual applications, when tail optical fiber adopted general single mode fiber, because optical fiber itself not have X and the Y-axis determined, therefore polariscopic folk prescription be to can being provided with arbitrarily, directions X be exactly with definite after a folk prescription to the direction at angle at 45; But the random birefringence of single-mode fiber can make the extinction ratio step-down at fiber-optic output mouth place.In order to guarantee high extinction ratio, can adopt polarization maintaining optical fibre as optical fiber pigtail.Because existing property of optical fiber this moment itself then should make two optical axises respectively in X-axis and Y-axis, during installation, should be by mentioned above, polariscopic folk prescription to X-axis angle at 45.
Claims (1)
1. directional correlation fibre optic polarizer, comprise two collimating apparatuss by polarizer light path requirement assembling, two Transmission Fibers in polariscope and front and back, it is characterized in that also include two 45 ° of Faraday rotators, they are separately positioned on polariscopic both sides, its two minute surface closely contacts with the minute surface of polariscope and collimating apparatus respectively, wherein, the sense of rotation of described two 45 ° of Faraday rotators is opposite, polariscopic folk prescription to a certain transmission direction play folk prescription at 45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420062821 CN2725912Y (en) | 2004-07-15 | 2004-07-15 | Direction related optical fibre polarizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420062821 CN2725912Y (en) | 2004-07-15 | 2004-07-15 | Direction related optical fibre polarizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2725912Y true CN2725912Y (en) | 2005-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420062821 Expired - Fee Related CN2725912Y (en) | 2004-07-15 | 2004-07-15 | Direction related optical fibre polarizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170365B (en) * | 2006-10-25 | 2012-07-04 | 住友金属矿山株式会社 | Bidirectional optical module |
| CN101802592B (en) * | 2007-08-20 | 2013-01-09 | 韩国生命工学研究院 | Surface plasmon resonance sensor using rotating mirror |
| CN114935795A (en) * | 2022-07-25 | 2022-08-23 | 中国科学技术大学 | Bidirectional isolator related to polarization maintaining optical fiber fast and slow axes and bidirectional mode-locked laser |
-
2004
- 2004-07-15 CN CN 200420062821 patent/CN2725912Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170365B (en) * | 2006-10-25 | 2012-07-04 | 住友金属矿山株式会社 | Bidirectional optical module |
| CN101802592B (en) * | 2007-08-20 | 2013-01-09 | 韩国生命工学研究院 | Surface plasmon resonance sensor using rotating mirror |
| CN114935795A (en) * | 2022-07-25 | 2022-08-23 | 中国科学技术大学 | Bidirectional isolator related to polarization maintaining optical fiber fast and slow axes and bidirectional mode-locked laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |