CN101726797A - Polarization-maintaining optical fiber coupler and Preparation method thereof - Google Patents
Polarization-maintaining optical fiber coupler and Preparation method thereof Download PDFInfo
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- CN101726797A CN101726797A CN200810043872A CN200810043872A CN101726797A CN 101726797 A CN101726797 A CN 101726797A CN 200810043872 A CN200810043872 A CN 200810043872A CN 200810043872 A CN200810043872 A CN 200810043872A CN 101726797 A CN101726797 A CN 101726797A
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Abstract
The invention discloses a preparation method of a polarization-maintaining optical fiber coupler, which comprises the following steps of: (1) at least taking one polarization-maintaining optical fiber and removing a coating layer at the preset position of the polarization-maintaining optical fiber; (2) fixing one end of the polarization-maintaining optical fiber, heating the local optical fiber section, of which the coating layer is removed by a high-temperature heating source so that the optical fiber section is in a softened state and then continuously rotating the other end of the polarization-maintaining optical fiber so that a softened optical fiber is twisted to form a twisting optical fiber section; and (3) positioning at least one twisted polarization-maintaining optical fiber and positioning other optical fibers or more than two twisted polarization-maintaining optical fibers according to the design requirement and then heating and fusing the twisting optical fiber section to form a coupling area.
Description
Technical field
The present invention relates to a kind of preparation method of polarization-maintaining fiber coupler, the invention still further relates to a kind of polarization-maintaining fiber coupler.
Background technology
Polarization-maintaining fiber coupler is one of components and parts important in the Fibre Optical Sensor always, but because most of optical fiber belong to the stress type polarization maintaining optical fibre, with the polarization-maintaining fiber coupler that they are made, its performance is very strong to dependence on temperature, particularly polarization sensitivity and splitting ratio.For this reason, useful in the prior art " sandwich " structure is developed the technology of stable high polarization-maintaining fiber coupler, it mainly is to carry out welding with polarization maintaining optical fibre and single-mode fiber, utilizes the input/output terminal of polarization maintaining optical fibre as coupling mechanism, and single-mode fiber is the coupled zone through fusion.Fig. 1 is the example with panda type polarization-preserving fiber preparation 2 * 2 polarization-maintaining fiber couplers, wherein earlier an end of single-mode fiber 1 and 2 is carried out welding with an end of polarization maintaining optical fibre 10 and 20 respectively, similarly the single-mode fiber 1 and 2 the other end also carry out welding with polarization maintaining optical fibre of the same type by the welding point.The characteristics of this technology seem simply, but implement more complicated and difficulty, and the rate that manufactures a finished product is relative also lower, thereby cost is just very high.Because polarization maintaining optical fibre and single-mode fiber need be carried out welding, the splice loss, splice attenuation of welding point has very large influence to the performance of coupling mechanism thus simultaneously.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of preparation method of polarization-maintaining fiber coupler, and it has higher temperature-resistant performance.
For solving the problems of the technologies described above, the preparation method of polarization-maintaining fiber coupler of the present invention comprises the steps:
1) gets a polarization maintaining optical fibre at least, remove the coat of described polarization maintaining optical fibre pre-position;
2) with an end of described polarization maintaining optical fibre fixing after, be located at soft state in the fiber segment that heats local described removal coat with heating source, the back is the other end of the described polarization maintaining optical fibre of rotation continuously, fiber segment after softening is reversed formed the twisted fiber section;
3) according to designing needs, the described twisted fiber section of heating and melting forms the coupled zone to the back, polarization maintaining optical fibre location after at least one is reversed with other optical fiber or behind the location of the polarization maintaining optical fibre after reversing more than two.
2 * 2 polarization-maintaining fiber couplers of the present invention are prepared from for adopting polarization maintaining optical fibre of the present invention.
The preparation method of polarization-maintaining fiber coupler of the present invention, it has utilized the high speed twisted fiber that it is twisted under thermoplastic condition, change the birefringenct property of original polarization maintaining optical fibre by the local polarization maintaining optical fibre that reverses, after becoming isotropic single-mode fiber, the coupled zone that polarization-maintaining fiber coupler is made in this zone of fusion, avoided the problem that welding point splice loss, splice attenuation in original sandwich structure and input and output polarization maintaining optical fibre master take out aligning thus, so enhance productivity effectively, reduce production costs, also improved the transmission performance of polarization-maintaining fiber coupler simultaneously.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the synoptic diagram before the fusion coupled zone of 2 * 2 polarization-maintaining fiber couplers in the prior art;
Fig. 2 is the synoptic diagram of step 2 in the preparation of the present invention;
Fig. 3 is at high temperature reversing the index distribution synoptic diagram of back optical fiber in the preparation of the present invention;
Fig. 4 is for adopting the synoptic diagram before method of the present invention prepares 2 * 2 polarization-maintaining fiber coupler fusion coupled zones;
Fig. 5 is a polarization-maintaining fiber coupler preparation flow synoptic diagram of the present invention.
Embodiment
Describe preparation method's (see figure 5) of polarization-maintaining fiber coupler of the present invention below in detail, get a polarization maintaining optical fibre earlier, with the panda type polarization-preserving fiber is example, at preposition the coat of its outside is peelled off certain length (generally can be 15 to 100mm does not wait), specifically will look prepared device property and decide; Then that an end 14 of polarization maintaining optical fibre is fixing, the fiber segment of peelling off coat with 30 pairs of parts of heating source heats makes optical fiber be in soft state, can make optical fiber softening getting final product in the specific time so the temperature of heating source is adjusted into, the other end 15 that meanwhile rotates polarization maintaining optical fibre continuously reverses softening part optical fiber continuously and forms one section twisted fiber section.Here should be noted that should avoid in the heating process near coat at least 2-3mm be reserved as fabricate devices when location to use with interior zone.This heating source can be made as portable, can move around along optical fiber in heating process, guarantees softening homogeneity of optical fiber and the fiber lengths that is in soft state, so that enough number of turns of reversing to be arranged in the unit length of guaranteeing final twisted fiber section.The length of twisted fiber section is controlled by the scope that heating source moves heating, and for the needs of technological process control, the speed of rotation can be per second changes about half-turn to a circle.The characteristic of twisted fiber section is mainly decided by the number of times of unit length intort, and the cycle of every millimeter intort is not less than 1 circle in the twisted fiber section.Fig. 3 is Refractive Index Profile o characteristics before and after reversing.Certain still polarization maintaining optical fibre or title birefringence fiber before reversing, but behind high speed rotating, birefringent characteristic disappears, and becomes isotropic single-mode fiber, and the refractive index of its covering slightly fluctuates.With the panda optic fibre is example, and originally near the region of high stress the panda eye has on average been fallen after reversing at a high speed, and its index distribution is approximately a common single mode optical fibres.In principle, the cycle that unit length is reversed is many more, and index distribution is even more.And in the application of reality, can determine suitable numerical value by test, can reach in general that to reverse 10 cycles just enough in every millimeter.Here need to prove that no matter the length of twisted fiber is what, the angle of reversing is N * 360 degree (wherein N gets non-vanishing integer), so transmit to guarantee still to remain on the main shaft of polarization maintaining optical fibre through the light that twisted fiber is exported.Can be slow axis, also can be fast axle, specifically will see the application of device.In particular cases also can be N * 360+M * 90 degree (when M was 1, the linearly polarized light that can be used for original input was positioned on the slow axis, during output will under the situation of fast axle), wherein N gets non-vanishing integer, and M is an integer.
Optical fiber after above-mentioned the reversing has been arranged, 2 * 2 polarization-maintaining fiber couplers of doing high stable are just much easier, as long as it is just passable that two of processing contain the optical fiber that height reverses, because the coupled characteristic and the common single mode optical fibres of the twisted fiber section in two polarization maintaining optical fibres are in full accord.Fig. 4 is for adopting the synoptic diagram of method preparation 2 * 2 polarization-maintaining fiber couplers of the present invention before the fusion coupled zone, for two are placed side by side through the optical fiber that reverses, the twisted fiber section is put together, and the location still be unanimity or quadrature (this point with make traditional polarization-maintaining fiber coupler be similar) with the orientation of guaranteeing optical fiber.Polarization-maintaining fiber coupler preparation flow with common is identical afterwards, heats twisted fiber section fusion formation coupled zone is got final product.
Above-mentioned only is a specific embodiment of polarization-maintaining fiber coupler of the present invention.Preparation method of the present invention can be applied in any polarization-maintaining fiber coupler preparation that needs polarization maintaining optical fibre, as 1 * 2, in 1 * 3,3 * 3 devices such as polarization maintaining optical fibre such as grade.
Claims (6)
1. the preparation method of a polarization-maintaining fiber coupler is characterized in that, comprises the steps:
1) gets a polarization maintaining optical fibre at least, remove the coat of described polarization maintaining optical fibre pre-position;
2) with an end of described polarization maintaining optical fibre fixing after, the fiber segment that heats local described removal coat with heating source makes described optical fiber reach soft state, the back is the other end of the described polarization maintaining optical fibre of rotation continuously, softening fiber segment is reversed formed the twisted fiber section;
3) according to the design needs, the polarization maintaining optical fibre location described twisted fiber section of back heating and melting with back, the location of the polarization maintaining optical fibre after root reverses at least and other optical fiber or after reversing more than two forms the coupled zone.
2. according to the described preparation method of claim 1, it is characterized in that: the angle of reversing described polarization maintaining optical fibre in the step 2 is N * 360+M * 90 degree, and wherein N gets non-vanishing integer, and M is an integer.
3. according to claim 1 or 2 described preparation methods, it is characterized in that: adopt the heating source that can move around along optical fiber in the step 1.
4. according to claim 1 or 2 described preparation methods, it is characterized in that: the cycle of every millimeter intort is not less than 1 circle in the twisted fiber section that forms in the described step 2.
5. according to the described preparation method of claim 3, it is characterized in that: the cycle of every millimeter intort is not less than 1 circle in the twisted fiber section that forms in the described step 2.
6. polarization-maintaining fiber coupler, it is characterized in that: described 2 * 2 polarization-maintaining fiber couplers are prepared from by claim 1 or 2 described preparation methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2008100438720A CN101726797B (en) | 2008-10-28 | 2008-10-28 | Polarization-maintaining optical fiber coupler and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100438720A CN101726797B (en) | 2008-10-28 | 2008-10-28 | Polarization-maintaining optical fiber coupler and preparation method thereof |
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| CN101726797A true CN101726797A (en) | 2010-06-09 |
| CN101726797B CN101726797B (en) | 2011-04-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922935A (en) * | 2010-07-16 | 2010-12-22 | 北京大学 | Interference type all-optic fiber gyroscope with minimum reciprocal structure |
| CN106199825A (en) * | 2016-08-02 | 2016-12-07 | 长飞光纤光缆股份有限公司 | A kind of sensor fibre and preparation method thereof and sensing fiber ring |
| CN113624462A (en) * | 2021-07-30 | 2021-11-09 | 中国航空工业集团公司西安飞行自动控制研究所 | Polarization maintaining optical fiber internal torsion measuring device and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5283847A (en) * | 1991-09-09 | 1994-02-01 | Sumitomo Electric Industries, Ltd. | Method of manufacturing and evaluating an optical fiber coupler and apparatus therefor |
| JP2001228354A (en) * | 2000-02-14 | 2001-08-24 | Fujikura Ltd | Device for manufacturing polarization maintaining coupler |
| JP2004133389A (en) * | 2002-08-12 | 2004-04-30 | Fujikura Ltd | Polarization maintaining optical fiber coupler and its manufacturing method |
-
2008
- 2008-10-28 CN CN2008100438720A patent/CN101726797B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922935A (en) * | 2010-07-16 | 2010-12-22 | 北京大学 | Interference type all-optic fiber gyroscope with minimum reciprocal structure |
| CN101922935B (en) * | 2010-07-16 | 2012-07-18 | 北京大学 | Interference type all-optic fiber gyroscope with minimum reciprocal structure |
| CN106199825A (en) * | 2016-08-02 | 2016-12-07 | 长飞光纤光缆股份有限公司 | A kind of sensor fibre and preparation method thereof and sensing fiber ring |
| CN106199825B (en) * | 2016-08-02 | 2018-11-23 | 长飞光纤光缆股份有限公司 | A kind of sensor fibre and preparation method thereof and sensing fiber ring |
| CN113624462A (en) * | 2021-07-30 | 2021-11-09 | 中国航空工业集团公司西安飞行自动控制研究所 | Polarization maintaining optical fiber internal torsion measuring device and method |
| CN113624462B (en) * | 2021-07-30 | 2023-07-21 | 中国航空工业集团公司西安飞行自动控制研究所 | Polarization-maintaining optical fiber internal torsion measuring device and method |
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| Publication number | Publication date |
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| CN101726797B (en) | 2011-04-27 |
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