CN1393723A - Light isolator - Google Patents
Light isolator Download PDFInfo
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- CN1393723A CN1393723A CN 01114860 CN01114860A CN1393723A CN 1393723 A CN1393723 A CN 1393723A CN 01114860 CN01114860 CN 01114860 CN 01114860 A CN01114860 A CN 01114860A CN 1393723 A CN1393723 A CN 1393723A
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- polarizer
- fiber optic
- optoisolator
- sleeve pipe
- optic collimator
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Abstract
A light isolator is composed of a first optical fibre collimator, an isolating center, a second optical fibre colliamtor with a longer sleeve tube, and an external packing sleeve tube. The isolating center conssits of two polarizers, a polarizing rotary crystal and a magnetic ring whose length is slightly less than or equal to the total length of the said polarizers and rotary crystal. The isolating center is in the sleeve tube of the second colliamtor and the magnetic ring is stuck to the sleeve tube.
Description
The invention relates to the combination of a kind of optics, especially have than low insertion loss, small size, compact conformation and be not vulnerable to the optoisolator of external environment variable effect about a kind of.
In optical communication system, flashlight is the many different optical interfaces of meeting process in transmission course, and reflection in various degree all can appear in each optical interface of process, and the return light may that this reflection produces will be returned light source along original optical path.When return light may intensity acquires a certain degree, will cause the instability of light source works, produce problems such as frequency drift, changes in amplitude, thereby influence the total system operate as normal.For avoiding return light may that devices such as light source are exerted an influence, must suppress return light may with optoisolator, to guarantee the work quality of optical communication system, and optoisolator is a kind of forward transmission light to be had than low insertion loss, and reverse transfer light is had the nonreciprocity optical passive component of very high attenuation, in order to suppress in the optical transmission system return light may to the harmful effect of light source.
Consult Fig. 1, existing commonly used optoisolator 1 comprises that the identical fiber optic collimator device 10 of two structures, quarantine center 30 and suit fix the outer tube 40 of this two fiber optic collimators device 10 and quarantine center 30, this fiber optic collimator device 10 is made up of the GRIN Lens 13 (0.23 pitches that adopt in the reality) and the contact pin 14 of fixed fiber 15 of a stainless-steel tube 11, a sleeve pipe 12,0.25 pitch more, the Beam Transformation that fiber optic collimator device 10 will transmit in optical fiber 15 becomes directional light, to improve the coupling efficiency between optical device.This quarantine center 30 is placed between this two fiber optic collimators device 10, comprise first polarizer 31, polarization rotating crystal 32, second polarizer 33 and magnet ring 34, wherein polarizer 31,33 can will be divided into mutually perpendicular o light in polarization direction and e light by light beam, this polarization rotating crystal 32 is utilized the Faraday effect of magneto-optical crystal, promptly the polarization rotating crystal of being made by magneto-optical crystal is under the effect in magnetic field, the vibration plane of the polarized light by this polarization rotating crystal is rotated, the optically-active angle of the polarization rotating crystal of existing optoisolator is 45 degree, becomes miter angle and the optical axis of this second polarizer 33 and the optical axis of first polarizer 31 are interlaced.
When the light signal forward transmitted, light signal is through fiber optic collimator device 10 collimations, after entering first polarizer 31, light beam is divided into mutually perpendicular o light in polarization direction and e light, when they through 45 the degree polarization rotating crystal 32 time, the vibration plane of outgoing o light and e light is separately along same direction rotation 45 degree, because the crystallographic axis of second polarizer 33 just in time is 45 degree with respect to first polarizer 31, therefore o light and e light are converged to together by 33 refractions of second polarizer, and be coupled in the optical fiber 15 via the GRIN Lens 13 of the fiber optic collimator device 10, thereby forward light with minimum loss by optoisolator 1.Because the nonreciprocity of Faraday effect, when the light beam reverse transfer, at first through second polarizer 33, be divided into plane of polarization and mutually perpendicular o light and e light, when this two polarized light through 45 the degree polarization rotating crystal 32 time, its vibration plane is still towards direction rotation 45 degree consistent with forward light sense of rotation, two separating light beam o light of retroeflection and e light have carried out mutual conversion each other with respect to first polarizer, 31 its character thus, promptly the o light from 33 outgoing of second polarizer becomes the light for e with respect to first polarizer 31, and become light with respect to first polarizer 31 for o from the e light of second polarizer, 33 outgoing, owing to different make two separating light beams of o light with character such as e optical indexs no longer transmit along original optical path, further be separated into than wide-angle by first polarizer 31 on the contrary, and in can not coupled into optical fibres 15, reach the purpose of reverse isolation.
The quarantine center 30 of existing commonly used optoisolator 1 is placed between this two fiber optic collimators device 10, and GRIN Lens 13 protrudes out in abutting connection with the end 131 of quarantine center and exceed sleeve pipe 12, and this stainless-steel tube 11 is set in again outside this sleeve pipe 12; First polarizer 31 in this quarantine center 30, polarization rotating crystal 32 and second polarizer 33 are positioned in the magnet ring 34 successively, and the crystal edge position gluing outside the crystal transparent zone is glued together fixing each other.During assembling, the GRIN Lens 13 that magnet ring 34 is entangled a fiber optic collimator device 10 protrudes out the end 131 of sleeve pipe 12, and at the fixing magnet ring 34 of lens end 131 viscose glues, thereby this fiber optic collimator device 10 is fixed together with quarantine center 30.
Yet, make and when the magnet ring 34 with this light quarantine center 30 is inserted in this lens end 131, can produce the glue bad phenomenon of overflowing owing to be connected by viscose glue, thereby lens 13 exit surfaces and adjacent polarizer surface are polluted, and this pollution is difficult to remove, to destroy the transmissivity of lens 13 exit surfaces thus, even dwindle its emittance area, and then strengthened the insertion loss of overall optical isolator.Simultaneously owing to this fiber optic collimator device 10 is fixed together with quarantine center 30, and greatly reduce the dirigibility of adjusting beam alignment, and required polarizer 31,33, the dimensional requirement of polarization rotating crystal 32 and magnet ring 34 is also bigger, the storehouse that is unfavorable for multi-stage light isolator is integrated, required manufacturing cost is also higher, the development trend of incompatibility whole industry.Moreover, because this light quarantine center 30 is positioned at outside this sleeve pipe 12, then be easy to be subjected to external environment humidity and Temperature Influence, and first polarizer 31, polarization rotating crystal 32 and second polarizer 33 are for being installed in advance in the magnet ring 34, if be subjected to polluting then not easy to clean in the magnet ring 34 before assembling.
The object of the present invention is to provide a kind ofly not to be subject to external environment humidity and temperature effect, and have low insertion loss and the lower optoisolator of manufacturing cost, it can effectively eliminate the pollution of outer bound pair quarantine center.
Purpose of the present invention can be achieved through the following technical solutions: one. and provide a kind of optoisolator to comprise the first fiber optic collimator device, quarantine center, second fiber optic collimator device and the outer tube.Wherein, this second fiber optic collimator device has the long sleeve pipe of a length, this quarantine center comprises first polarizer, polarization rotating crystal, second polarizer and magnet ring, this first polarizer, polarization rotating crystal and second polarizer are positioned in the magnet ring successively, and the total length of magnet ring can be slightly less than or equal the summation of two polarizers and polarization rotating crystal length.And the external diameter of magnet ring is slightly less than the internal diameter of the second fiber optic collimator device sleeve pipe.The magnet ring that is set with first polarizer, polarization rotating crystal and second polarizer is fixed in the sleeve pipe of the second fiber optic collimator device.
Two. provide a kind of optoisolator to comprise the fine collimating apparatus of two same light, a quarantine center and a glass sleeve, this sleeve pipe is to be fixed on last this quarantine center of one of two fiber optic collimator devices with viscose glue to comprise first polarizer, polarization rotating crystal, second polarizer and magnet ring, this first polarizer, polarization rotating crystal and second polarizer are positioned in the magnet ring successively, and the total length of magnet ring can be slightly less than or equal the summation of two polarizers and polarization rotating crystal length.And the external diameter of magnet ring is slightly less than the internal diameter of glass bushing.The magnet ring that is set with first polarizer, polarization rotating crystal and second polarizer is fixed in the sleeve.
Compared with prior art, the present invention has following advantage: it can effectively be eliminated the pollution of outer bound pair quarantine center and make quarantine center not be subject to external environment humidity and temperature effect, and is lower owing to required each crystal and less its cost that makes of magnet ring size simultaneously.
Below in conjunction with accompanying drawing embodiments of the invention are elaborated:
Fig. 1 is the cut-open view of existing optoisolator.
Fig. 2 is the cut-open view of first embodiment of the invention optoisolator.
Fig. 3 is the cut-open view of second embodiment of the invention optoisolator.
See also Fig. 2, be the cut-open view of optoisolator first embodiment of the present invention, this optoisolator 2 comprises that the first fiber optic collimator device 10, the fiber optic collimator device 20, quarantine center 60 and suit fix the outer tube 40 of first, second fiber optic collimator device 10,20 and quarantine center 60.
This first fiber optic collimator device 10 comprises a contact pin 14, a GRIN Lens 13, a sleeve pipe 12 and a stainless-steel tube 11.Wherein this contact pin 14 comprises first end 18, two ends 19 and an endoporus 16 again, this endoporus 16 is provided with a chamfering near first end, 18 places and inserts in the endoporus 16 to make things convenient for optical fiber 15, and the end face of this optical fiber 15 is flushed with two ends 19, this second end 19 is worn into about 8 degree angles, and is coated with anti-reflective film in this end face.This sleeve pipe 12 is generally made by glass material, and be roughly a hollow tube, in order to suit fixedly GRIN Lens 13 and contact pin 14, and sleeve pipe 12 length in the first fiber optic collimator device 10 are shorter, make the end 131 of GRIN Lens 13 contiguous quarantine centers 60 protrude in outside the sleeve pipe 12.
Similar with the first fiber optic collimator device 10, this second fiber optic collimator device 20 comprises a contact pin 14, a GRIN Lens 13, sleeve pipe 22 and a stainless-steel tube 11, difference only is that the sleeve pipe 22 in the second fiber optic collimator device 20 is long therebetween, GRIN Lens 13 is placed in it fully, and this sleeve pipe 22 lengthenings exceed its length of part outside the lens 13 can ccontaining quarantine center 60 in it.
This quarantine center 60 is placed in the sleeve pipe 22, the boundary is between this first fiber optic collimator device 10 and the second fiber optic collimator device 20, this quarantine center 60 comprises first polarizer 61, polarization rotating crystal 62, second polarizer 63 and magnet ring 64, this first polarizer 61, the polarization rotating crystal 62 and second polarizer 63 place magnet ring 64 successively, wherein this first polarizer 61 and second polarizer 63 are all birefringece crystal, interlaced one-tenth 45 degree of the optical axis of two birefringece crystals when placing magnet ring 64, this polarization rotating crystal 62 is the Faraday crystal, and its optically-active angle is roughly 45 degree.The total length of this magnet ring 64 can be slightly less than or equal the summation of two polarizers 61,63 and polarization rotating crystal 62 length, simultaneously, dwindle the overall dimensions of magnet ring 64, polarizer 61,63 and gyrotropi crystal 62, so that light quarantine center 60 external diameters are slightly less than sleeve pipe 22 internal diameters in the second fiber optic collimator device 20, thereby quarantine center 60 can built-inly be fixed in this sleeve pipe 22, and can be free to slide betwixt so that adjust beam alignment.
During assembling, to be built in the sleeve pipe 22 by the quarantine center 60 that first polarizer 61, polarization rotating crystal 62, second polarizer 63 and magnet ring 64 constitute, slide or rotation quarantine center 60 and contact pin 14, and adjust the relative position of two fiber optic collimator devices 10,20 simultaneously, when insert loss and isolation simultaneously after the optimization encapsulation form optoisolator.Generally speaking, this quarantine center 60 near the end of the first fiber optic collimator devices 10 with parallel sleeve pipe 22 near the terminal of the first fiber optic collimator devices 10 or slightly be depressed in the sleeve pipe 22 preferable.Because quarantine center's 60 overall volume of this optoisolator are reduced, and make the crystal of corresponding use and magnet ring volume reduce, and promptly help the integrated of multi-stage light isolator, can reduce manufacturing cost again; And quarantine center 60 places in the sleeve pipe 22, can make it not be subject to external environment humidity, Temperature Influence, need between magnet ring 64 and collimator apparatus 10 or 20 adjacent ends, quarantine center 60 be fixed on collimator apparatus 10 or 20 the employing viscose glue simultaneously, therefore can not produce problems such as the glue that overflows is bad, and after before the encapsulation quarantine center's 60 planes of crystal being carried out cleaning, need not to repeat cleaning, the encapsulation back logical optical surface of each crystal is still kept clean, and the insertion loss that can not improve the overall optical isolator.
Seeing also Fig. 3, is the cross section view of optoisolator second embodiment of the present invention, and this optoisolator 3 comprises two identical fiber optic collimator devices 10, and the optoisolator 2,3 among first, second embodiment has identical quarantine center 60 simultaneously.Yet, compare with optoisolator 2 among first embodiment, different is this optoisolator 3 disposes a glass material between the second fiber optic collimator device 10 and quarantine center 60 sleeve 8, and these sleeve 8 one ends are pasted and are fixed on the end that protrudes in sleeve pipe 12 131 of lens 13 in the second fiber optic collimator device 10.During assembling, the depollution that causes owing to bad excessive glue during earlier with fixed muffle 8 places quarantine center 60 in the sleeve 8 slip quarantine center 60 again, and adjust the relative position of two fiber optic collimator devices 10 simultaneously, when insert loss and isolation simultaneously after the optimization encapsulation form optoisolator.Generally speaking, this quarantine center 60 near the end of the first fiber optic collimator devices 10 with parallel sleeve pipe 8 near the terminal of the first fiber optic collimator devices 10 or slightly be depressed in the sleeve pipe 8 preferable.
Claims (22)
1. optoisolator, comprise the first fiber optic collimator device, second fiber optic collimator device and the quarantine center, wherein first collimator apparatus comprises a contact pin, one lens and a sleeve pipe, this sleeve pipe suit fixed lens and contact pin, this second fiber optic collimator device comprises a contact pin, one lens and a sleeve pipe, this sleeve pipe suit fixed lens and contact pin, and quarantine center comprises first polarizer, the polarization rotating crystal, second polarizer and magnet ring, this first polarizer, the polarization rotating crystal and second polarizer place magnet ring successively, it is characterized in that: the sleeve pipe in this second fiber optic collimator device is longer, the complete suit of lens can be fixed in wherein, and this sleeve pipe also protrudes out the outer length-specific of lens, and this quarantine center's suit is fixed in the sleeve pipe of this lengthening.
2. optoisolator as claimed in claim 1 is characterized in that the length of this magnet ring is less than or equal to the length summation of two polarizers and polarization rotating crystal.
3. optoisolator as claimed in claim 2 is characterized in that the some of the lens in this first fiber optic collimator device protrudes out for outside the sleeve pipe.
4. optoisolator as claimed in claim 1 is characterized in that the lens in this two fiber optic collimators device all are GRIN Lens.
5. optoisolator as claimed in claim 1 is characterized in that first polarizer and second polarizer all are birefringece crystal, and polarization rotation device is a Faraday rotator.
6. optoisolator as claimed in claim 1 is characterized in that this quarantine center's external diameter is slightly less than the internal diameter of the second fiber optic collimator device sleeve pipe.
7. optoisolator as claimed in claim 6 is characterized in that the sleeve pipe of this second fiber optic collimator device protrudes in the outer length-specific of lens greater than quarantine center's total length.
8. optoisolator as claimed in claim 7, it is characterized in that this quarantine center near parallel this second fiber optic collimator device lengthening sleeve pipe of the end face of the first fiber optic collimator device near the end face of the first fiber optic collimator device or slightly be depressed in sleeve pipe b.
9. optoisolator as claimed in claim 1 is characterized in that the sleeve pipe of this second fiber optic collimator device protrudes in the outer length-specific of lens greater than quarantine center's total length.
10. optoisolator, mainly comprise two fiber optic collimator devices and a quarantine center, this collimator apparatus comprises a contact pin, one lens and a sleeve pipe, this sleeve pipe suit fixed lens and contact pin, this quarantine center comprises first polarizer, the polarization rotating crystal, second polarizer and magnet ring, this first polarizer, the polarization rotating crystal and second polarizer are placed magnet ring successively, it is characterized in that: this optoisolator comprises that also a sleeve is the lens end that one of is fixed in this two fiber optic collimators device with viscose glue, and this quarantine center is fixed in the sleeve of lens end by suit.
11. optoisolator as claimed in claim 10 is characterized in that the length of this magnet ring is less than or equal to the length summation of two polarizers and polarization rotating crystal.
12. optoisolator as claimed in claim 11 is characterized in that this first polarizer and second polarizer are birefringece crystal, polarization rotation device is a Faraday rotator.
13. optoisolator as claimed in claim 10 is characterized in that this first polarizer and second polarizer are birefringece crystal, polarization rotation device is a Faraday rotator.
14. optoisolator as claimed in claim 10 is characterized in that this quarantine center's external diameter is slightly less than the internal diameter of this sleeve.
15. optoisolator as claimed in claim 14 is characterized in that this quarantine center's end face is parallel or slightly is depressed in this sleeve end face.
16. optoisolator as claimed in claim 10 is characterized in that this quarantine center's end face is parallel or slightly is depressed in this sleeve end face.
17. optoisolator, comprise one first fiber optic collimator device, one second fiber optic collimator device and a quarantine center, wherein this second fiber optic collimator device comprises a sleeve pipe at least, and quarantine center comprises first polarizer, polarization rotating crystal, second polarizer and magnet ring, this first polarizer, polarization rotating crystal and second polarizer are to place magnet ring successively, it is characterized in that: this quarantine center's suit is fixed in the sleeve pipe of this second fiber optic collimator device, and the length of its magnet ring is less than or equal to the length summation of two polarizers and polarization rotating crystal.
18. optoisolator as claimed in claim 17 is characterized in that this quarantine center's external diameter is slightly less than the internal diameter of the second fiber optic collimator device sleeve pipe.
19. optoisolator as claimed in claim 17 is characterized in that this quarantine center is parallel or slightly be depressed in the end face of this second fiber optic collimator device sleeve pipe near the first fiber optic collimator device near the end face of the first fiber optic collimator device.
20. optoisolator, comprise two fiber optic collimator devices and a quarantine center, this quarantine center comprises first polarizer, polarization rotating crystal, second polarizer and magnet ring, this first polarizer, polarization rotating crystal and second polarizer are to place magnet ring successively, it is characterized in that: this optoisolator also comprises a sleeve, it is one of to be fixed in this two fiber optic collimators device with viscose glue, be fixed in this sleeve and this quarantine center is a suit, and the length of its this magnet ring is less than or equal to the length summation of two polarizers and polarization rotating crystal.
21. optoisolator as claimed in claim 20 is characterized in that this quarantine center's external diameter is slightly less than the internal diameter of this sleeve.
22. optoisolator as claimed in claim 20 is characterized in that this quarantine center's end face is parallel or slightly is depressed in this sleeve end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01114860 CN1190685C (en) | 2001-06-21 | 2001-06-21 | Light isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01114860 CN1190685C (en) | 2001-06-21 | 2001-06-21 | Light isolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1393723A true CN1393723A (en) | 2003-01-29 |
| CN1190685C CN1190685C (en) | 2005-02-23 |
Family
ID=4661468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01114860 Expired - Fee Related CN1190685C (en) | 2001-06-21 | 2001-06-21 | Light isolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1190685C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354029A (en) * | 2011-09-28 | 2012-02-15 | 福州百讯光电有限公司 | Jumper wire collimating device |
| CN106707414A (en) * | 2016-12-26 | 2017-05-24 | 上海伟钊光学科技股份有限公司 | Optical fiber isolator |
| CN113219682A (en) * | 2021-05-06 | 2021-08-06 | 深圳市中葛科技有限公司 | Novel all-optical fiber isolator and preparation method thereof |
-
2001
- 2001-06-21 CN CN 01114860 patent/CN1190685C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354029A (en) * | 2011-09-28 | 2012-02-15 | 福州百讯光电有限公司 | Jumper wire collimating device |
| CN106707414A (en) * | 2016-12-26 | 2017-05-24 | 上海伟钊光学科技股份有限公司 | Optical fiber isolator |
| CN106707414B (en) * | 2016-12-26 | 2024-01-19 | 上海毫米星光光学有限公司 | Optical fiber isolator |
| CN113219682A (en) * | 2021-05-06 | 2021-08-06 | 深圳市中葛科技有限公司 | Novel all-optical fiber isolator and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1190685C (en) | 2005-02-23 |
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