CN1664636A - Polarization maintaining optical fiber collimator - Google Patents
Polarization maintaining optical fiber collimator Download PDFInfo
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- CN1664636A CN1664636A CN 200510024171 CN200510024171A CN1664636A CN 1664636 A CN1664636 A CN 1664636A CN 200510024171 CN200510024171 CN 200510024171 CN 200510024171 A CN200510024171 A CN 200510024171A CN 1664636 A CN1664636 A CN 1664636A
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- polarization
- optical fiber
- maintaining optical
- fiber collimator
- polarization maintaining
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Abstract
This invention relates to fiber field and to one bias fiber calibrator, which comprises calibration lens and calibration outer seal with one bias position key added. The bias position key direction is parallel to the bias direction of the bias beam and the bias position direction is parallel to the bias fiber slow axis.
Description
Technical field
The present invention relates to field fiber, particularly a kind of polarization maintaining optical fiber collimator.
Background technology
The optical transmission system of common polarization laser is made up of laser beam optical fibre coupling device, optical patchcord and optical collimator three parts.Linearly polarized laser light beam through collimation is imported wherein as the high-quality light source of an optical system.The polarization maintaining optical fibre wire jumper is connected the line of collimation polarized laser beam of outputting high quality by optical fiber interface (FC type, ST type and SMA type etc.) with the collimating apparatus that has optical fiber interface equally.In the practical application, for example laboratory applications or optical device are made the field, and usually collimating apparatus being fixed in one can obtain required polarization direction by regulating the rotation adjusting bracket among the rotation adjusting bracket of optical axis rotation.
Common polarization maintaining optical fiber collimator does not all have to determine the mechanism of its output collimated light beam polarization direction, and we can accurately not know the polarization direction of its polarization light output.For common great majority were used, the polarization direction of a needed incoming line polarized light source of optical system was certain.Laboratory applications for example, the polarization direction of the linearly polarized light light source that we are required is normally perpendicular or parallel in test platform.Need in actual use with optical fiber collimator be fixed in one can the rotation adjustment device of 360 ° of rotations in, on the exit direction of collimating apparatus, utilize wave plate (need build light path) or utilize expensive polarimetry instrument to go to measure the polarization direction of the polarization light of exporting by collimating apparatus.And the profile and the size of collimating apparatus may can not be mated with the interface of existing rotation adjustment device usually, so also will process adaptive device voluntarily, realize the fixing of collimating apparatus and rotation adjustment device.These have all caused very big inconvenience to the use of reality.Especially have for those bulks limited (coalignment and measurement mechanism all have certain volume) with for the direction of the output polarization attitude of PM optical fiber collimator and determine the application that requires, all the more so.
Summary of the invention
The purpose of this invention is to provide a kind of novel polarization maintaining optical fiber collimator, solving existing polarization maintaining optical fiber collimator does not all have to determine the problem of the mechanism of its output collimated light beam polarization direction, help system summary, miniaturization, reduce cost and reduce installation time, make work efficiency improve greatly.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of polarization maintaining optical fiber collimator, comprise collimation lens and collimation lens outer package, it is characterized in that: added a polarization positioning key on this package casing, the direction of this polarization positioning key is identical with the output polarization polarisation of light direction of collimating apparatus, and the direction of polarization positioning key is also parallel with the direction of the slow axis of polarization maintaining optical fibre (or fast axle).
This collimation lens and collimation lens outer package are positioned on the collimation lens fixing device.
The present invention has following advantage:
The present invention has adopted said structure, help system summary, miniaturization, reduce cost and reduce installation time, make work efficiency improve greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the output end face synoptic diagram of the polarization maintaining optical fiber collimator of the present invention with positioning key.
Fig. 3 is the extinction ratio PER of output polarization light beam of polarization maintaining optical fiber collimator and the graph of a relation of angle theta.
Embodiment
See also Fig. 1, it is the structural representation of polarization maintaining optical fiber collimator of the present invention.As shown in the figure: it comprises collimation lens 1 and collimation lens outer package 2, this encapsulates and has added a polarization positioning key 3 on 2 shells, the output polarization polarisation of light direction identical (direction that is the polarization positioning key parallels with the output polarization polarisation of light direction of collimating apparatus) of the direction of this polarization positioning key 3 and collimating apparatus, the direction of polarization positioning key 3 are also parallel with the direction of the slow axis (or fast axle) of polarization maintaining optical fibre 5.This collimation lens 1 and collimation lens outer package 2 are positioned on the collimation lens fixing device 4.
We can know the polarization direction of output beam easily by this key, if on the equipment that will use polarization maintaining optical fiber collimator, reserve the slot of certain precision of required polarization direction, just can directly this kind polarization maintaining optical fiber collimator be inserted in the slot, obtain light beam at required direction polarization.
The calculating of the extinction ratio of the output polarization light of this kind polarization maintaining optical fiber collimator.Computing formula is as the formula (1):
PER＝-10log(tan
2θ)； (1)
Wherein, PER represents polarization extinction ratio.θ represents the angle of polarization positioning key and output polarization polarisation of light direction (or the slow axis of polarization maintaining optical fibre or quick shaft direction), as shown in Figure 2.The extinction ratio PER of the output polarization light beam of this polarization maintaining optical fiber collimator and the relation of θ be as shown in Figure 3:
By formula (1) and Fig. 3 as can be known, go out to export extinction ratio and be greater than 20dB, angular error must be less than 6 degree, if want extinction ratio to reach 30dB, angular error must be spent less than 1.8.This is not difficult to realize from kind of the machining of rank precision.
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (2)
1, a kind of polarization maintaining optical fiber collimator, comprise collimation lens and collimation lens outer package, it is characterized in that: added a polarization positioning key on this package casing, the direction of this polarization positioning key is identical with the output polarization polarisation of light direction of collimating apparatus, and the direction of polarization positioning key is also parallel with the direction of the slow axis of polarization maintaining optical fibre (or fast axle).
2, polarization maintaining optical fiber collimator according to claim 1 is characterized in that: this collimation lens and collimation lens outer package are positioned on the collimation lens fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024171 CN1664636A (en) | 2005-03-02 | 2005-03-02 | Polarization maintaining optical fiber collimator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024171 CN1664636A (en) | 2005-03-02 | 2005-03-02 | Polarization maintaining optical fiber collimator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1664636A true CN1664636A (en) | 2005-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510024171 Pending CN1664636A (en) | 2005-03-02 | 2005-03-02 | Polarization maintaining optical fiber collimator |
Country Status (1)
| Country | Link |
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| CN (1) | CN1664636A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018549A (en) * | 2021-09-30 | 2022-02-08 | 昂纳信息技术（深圳）有限公司 | Polarization correlation loss auxiliary measuring device and measuring system |
-
2005
- 2005-03-02 CN CN 200510024171 patent/CN1664636A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018549A (en) * | 2021-09-30 | 2022-02-08 | 昂纳信息技术（深圳）有限公司 | Polarization correlation loss auxiliary measuring device and measuring system |
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