CN106047171B - Abies balsam protective agent and with abies balsam protective agent make lithium niobate crystal blade technolgy - Google Patents
Abies balsam protective agent and with abies balsam protective agent make lithium niobate crystal blade technolgy Download PDFInfo
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- CN106047171B CN106047171B CN201610623845.5A CN201610623845A CN106047171B CN 106047171 B CN106047171 B CN 106047171B CN 201610623845 A CN201610623845 A CN 201610623845A CN 106047171 B CN106047171 B CN 106047171B
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- lithium niobate
- transparent surface
- protective agent
- joint face
- abies balsam
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D193/00—Coating compositions based on natural resins; Coating compositions based on derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
Abstract
The present invention relates to a kind of abies balsam protective agent, by weight, including following component：46 parts of abies balsam, 2.5 to 3.5 parts of ethyl alcohol, 1.5 to 2.5 parts of ether.The abies balsam protective agent of the present invention has the advantages that stability is strong, being firmly bonded property is good and easy to clean, can apply the protection in optics lens surface, be used for example in the protection of the optics plane of crystal such as lithium niobate, Yttrium Orthovanadate, potassium titanium oxide phosphate, sapphire.The present invention also proposes a kind of technique that lithium niobate crystal chip is produced using abies balsam protective agent, which has the advantages that step is simple, can improve lithium niobate crystal chip processing quality.
Description
Technical field
The present invention relates to the techniques of a kind of abies balsam protective agent and application abies balsam protective agent making lithium niobate crystal chip.
Background technology
In optical communication system, flashlight can pass through many different optical interfaces in transmission process, by each
A optical interface will appear different degrees of reflection, and the return light for reflecting generation may be along former optical path return light
Source, it is unstable to be bound to cause light source working, the problems such as generating frequency drift, signal attenuation change, so as to influence entire optical communication
System worked well.In order to avoid return light has an impact the devices such as light source, it is necessary to inhibit return light with optoisolator, with true
Protect the work quality of optical communication system.And optoisolator be it is a kind of there is very low insertion loss to forward direction transmission light, to reversely passing
The nonreciprocity passive device of very big attenuation is lost, to inhibit in light communication system return light to unfavorable caused by light source
It influences.
For this purpose, in 102707461 B of Authorization Notice No. CN, entitled " manufacturing method of polarization independent optical isolator,
Optical element bonding technology and solution " discloses a kind of manufacturing method of polarization independent optical isolator, including：
Step 10, two polarization selection chips prepare：Take the birefringence chip of a pair of big thang-kng size, its bonding face of grinding and polishing,
The bonding face of two birefringence chips is opposite, and the optical axis included angle of two birefringence chips is 45 °, and two optical axises are each parallel to bonding face；
For two bonding faces after grinding and polishing, face shape is better than λ/4, and finish is better than 60-40, and roughness is better than 2 nanometers of root mean square, and is throwing
Plating is using the anti-reflection film to SiO2 materials in wave-length coverage on the bonding face of light, and anti-reflection film outermost layer is SiO2 film materials
Material obtains the first and second polarizations selection chip；One polarization rotator chip prepares：It takes a piece of similary logical with polarization selection chip
The Faraday rotation chip of 45 ° of rotation angles of light size, surface polishing, face shape are better than λ/4, and finish is better than 60-40, roughness
It is plated better than 2 nanometers of root mean square, and on two thang-kng surfaces using the anti-reflection film to SiO2 materials in wave-length coverage, and anti-reflection film
Outermost layer is SiO2 thin-film materials；
Step 20, bonding：It first selects bonding chip face-up first polarization, and bonding surface is pressed with alcohol and ether
Volume ratio 1:0.4-1 microlitres/square centimeter of bonding liquid is dripped after 1 mixed solution wiped clean, then takes the polarization rotator
Chip and with alcohol and ether by volume 1:1 mixed solution wiped clean, by one of placed face down in first partially
It shakes and selects on bonding chip face and be aligned, according to same method in the second polarization of the upper surface of polarization rotator chip bonding
Chip is selected, makes two polarizations that chip optical axis included angle be selected to place alignment for 45 °, after three wafer aligneds are placed, adds 5-
The pressure of 15Kg/cm2, and kept for 2-4 hour, placement stove is taken out later is heat-treated 100~200 DEG C at least 24 hours；
To the bonding substrate of the composite integrated of big thang-kng size；Wherein, the preparation method of the bonding liquid is：Take a appropriate volume
Sodium silicate aqueous solution, the sodium silicate aqueous solution composition are the SiO2 of the NaOH and 25-30% of weight ratio 10-14%, then by volume
Deionized water than taking 2 to 6 parts is mixed with sodium silicate aqueous solution to be shaken up, then with less than 0.2 micron of microporous film filter mistake
After filter to obtain the final product；
Step 30, slitting：The bonding substrate of gained is slitting, also, the short side dimension of strip light pass surface is by final
The size on any one side of isolator core light pass surface determines；
Step 40, grinding and polishing：By the bonding combined substrate grinding and polishing of strip into angle of wedge plane, and with this plane contact blocking,
Another angle of wedge plane of grinding and polishing, two angle of wedge planes are mutually parallel；
Step 50, plated film：By two angle of wedge planes after grinding and polishing at it using being coated with the antireflective increasing to air in wave-length coverage
Permeable membrane；
Step 60, strip are cut small：By the light pass surface size of finally requirement, strip bonding substrate is cut into compound isolator
Core；
Step 70, assembling：By the isolator core of gained and magnet ring, glass bushing, two optical fiber collimators be assembled into one it is complete
Whole polarization independent optical isolator.
In above-mentioned technique, make not carry out isolator core certain protection in slitting, easily cause the loss of slitting trimming,
Cutting the grinding generated in the process simultaneously also makes to anti-reflection film surface damage.
In consideration of it, inventor furthers investigate the above problem, there is this case generation then.
Invention content
The purpose of the present invention is to provide a kind of can protect to promote the abies balsam protective agent for cutting quality；
The present invention also proposes a kind of technique that lithium niobate crystal chip is made using above-mentioned abies balsam protective agent simultaneously, which adds
Work technique is simple, processing efficiency is higher, can save raw material, ensures processing quality.
In order to achieve the above object, the present invention uses such technical solution：
Abies balsam protective agent, by weight, including following component：4-6 parts of abies balsam, 2.5 to 3.5 parts of ethyl alcohol, ether 1.5
To 2.5 parts.
As a kind of preferred embodiment of the present invention, the volumetric concentration of the ethyl alcohol is 95%.
The present invention also proposes a kind of abies balsam protective agent making lithium niobate crystal blade technolgy, including walking as follows
Suddenly：A, the processing of lithium niobate blank：Lithium niobate blank is selected, lithium niobate blank has first thoroughly
Smooth surface and the second transparent surface, the first transparent surface plate the first anti-reflection film after grinding and polishing；
B, disk on blank：Lithium niobate blank after processing of step A is placed on charging tray, the first light transmission is placed up,
Second light transmission placed face down coats abies balsam protective agent on the first anti-reflection film, and by weight, abies balsam protective agent is included such as
Lower component：5 parts of abies balsam, 3 parts of ethyl alcohol, 2 parts of ether.
C, it cuts：Lithium niobate blank is cut into strip lithium niobate；
D, upper fixture：Strip lithium niobate is placed on fixture, and the first transparent surface is made to place downward, the second transparent surface court
Upper placement；
E, grinding and polishing：Grinding and polishing is carried out to the second transparent surface；
F, plated film：Second transparent surface is wiped, and plated film is carried out to the second transparent surface；
E, it detects：To the fastness of the angle of strip lithium niobate, finish, the fastness of the first anti-reflection film and the second anti-reflection film
It is detected；
G, granule is cut：Strip lithium niobate is cut into granular chip.
As a kind of preferred embodiment of the present invention, the fixture includes pedestal, and the lower surface of pedestal is plane, pedestal it is upper
Surface is laid with multiple placement racks, and each placement rack includes the supporting walls being mutually linked and abutment walls, supporting walls hang down with abutment walls
Straight setting, the angle where supporting walls between plane and the lower surface of pedestal is 13 degree.
As a kind of preferred embodiment of the present invention, in step D, pitch is coated on supporting walls, pitch is made by heating
Softening, strip lithium niobate is placed on pitch, makes bitumen solidification by cooling.
As a kind of preferred embodiment of the present invention, in step E, before being detected to strip lithium niobate, drip is made by heating
Blueness softening, strip lithium niobate is removed from fixture.
As a kind of preferred embodiment of the present invention, the first transparent surface in step A passes through after grinding and polishing, and face shape is better than λ/4,
Finish is better than 60-40, and roughness is better than 2 nanometers of root mean square.
As a kind of preferred embodiment of the present invention, for the second transparent surface in step E after grinding and polishing, face shape is better than λ/4, light
Cleanliness is better than 60-40, and roughness is better than 2 nanometers of root mean square.
As a kind of preferred embodiment of the present invention, the granular chip in step G includes first transparent surface, described second
Transparent surface and the first joint face being formed between first transparent surface and second transparent surface, the second joint face, third
Joint face and the 4th joint face, the first joint face are arranged in parallel with the second joint face, and third joint face is put down with the 4th joint face
Row setting, first transparent surface is vertical with the second joint face, and the angle between second transparent surface and the second joint face is
77 degree, the spacing between the first joint face and the second joint face is 1.25mm, first transparent surface and second transparent surface
Between maximum spacing be 0.54mm.
As a kind of preferred embodiment of the present invention, first anti-reflection film and second anti-reflection film are magnesium fluoride layer.
The abies balsam protective agent of the present invention has the advantages that stability is strong, being firmly bonded property is good and easy to clean, Ke Yiying
Used in the protection of optics lens surface, it is used for example in the optics crystalloid such as lithium niobate, Yttrium Orthovanadate, potassium titanium oxide phosphate, sapphire
The protection on surface.
The technique that the above-mentioned abies balsam protective agent of present invention application makes lithium niobate crystal chip has that technique is simple, can improve niobium
The advantages of sour lithium chip processing quality.
Description of the drawings
Fig. 1 is the dimensional structure diagram of granular chip in the present invention；
Fig. 2 is the planar structure schematic diagram of granular chip in the present invention；
Fig. 3 is lithium niobate blahk structure schematic diagram in the present invention；
Fig. 4 is the structure diagram cut in the present invention；
Fig. 5 is the structure diagram of slitting cooperation fixture in the present invention；
In figure：
1- lithium niobate blanks 10- is cut
Granular the first transparent surfaces of chip 101- of 100-
102- the second transparent surface the first joint faces of 103-
104- the second joint face 105- third joint faces
20- fixture 21- upper surfaces
22- lower surfaces 23- placement racks
231- supporting walls 232- abutment walls
31- the first anti-reflection film the second anti-reflection films of 32-
40- grinding parts
Specific embodiment
In order to further explain the technical solution of the present invention, it is described in detail below in conjunction with the accompanying drawings.
Referring to figs. 1 to Fig. 5, a kind of manufacture craft of lithium niobate crystal chip in turn includes the following steps：
A, the processing of lithium niobate blank 1：Select lithium niobate blank 1, lithium niobate blank 1 has the first transparent surface 101 and the
Two transparent surfaces 102, the first transparent surface 101 plate the first anti-reflection film 31 after grinding and polishing, and in actual production, grinding and polishing is using grinding
Machine, plated film use coating machine；
B, disk on blank：Lithium niobate blank 1 after processing of step A is placed on charging tray, the first transparent surface 101 is put upward
(i.e. the first anti-reflection film 31 is placed upward) is put, the second transparent surface 102 is placed downward；
C, it cuts：Lithium niobate blank 1 is cut into strip lithium niobate 10, in actual production, using scribing cut-off machine of many by niobium
Sour lithium blank 1 is cut into the strip lithium niobate 10 of preliminary dimension.In actual production, can according to according to fixture 20 (in detail below
Introduce) size, by every strip lithium niobate 10 to being partly cut into two sections；
D, upper fixture：Strip lithium niobate 10 is placed on fixture 20, and the first transparent surface 101 is made to place downward, second
Transparent surface 102 is placed upward；
E, grinding and polishing：Grinding and polishing is carried out to the second transparent surface 102, in actual production, grinding and polishing uses grinder.
F, plated film：Second transparent surface 102 is wiped, and plated film is carried out to the second transparent surface 102, in actual production
In, grinding and polishing uses grinder, and plated film uses coating machine.
E, it detects：To the angle of strip lithium niobate 10, finish, the fastness of the first anti-reflection film 31 and the second anti-reflection film 32
Fastness be detected, specifically tested using petrographic microscope, laser angle meter and 3M test tapes；
G, granule is cut：Using inscribed circle cutting machine and scribing cut-off machine of many by detect it is qualified after strip lithium niobate 10 be cut into it is pre-
Fixed granular chip 100.
As a kind of preferred embodiment of the present invention, in step B, abies balsam protection is coated on first anti-reflection film 31
Agent, abies balsam protective agent include the component of following parts by weight：4-6 parts of abies balsam, 2.5 to 3.5 parts of ethyl alcohol, ether 1.5 to 2.5
Part.Most preferably, 5 parts of abies balsam, 3 parts of ethyl alcohol, 2 parts of ether.Wherein, abies balsam is yellow transparent solid body, density (20 DEG C) 1.05
~1.06g/cm3, refractive index (20 DEG C) 1.520~1.540, linear expansion coefficient (25 DEG C) 1.6 × 10-4~2.0 × 10-4, acid value
96~110, saponification number 124~135 can directly be bought, such as can be directly from the limited public affairs of Shanghai ethyl chemical industry from market
Department directly buys.The volumetric concentration of ethyl alcohol is 95%, and ether selects anhydrous ether.Abies balsam is dissolved in shape in ethyl alcohol and ether
Agglutination protective agent.
As a kind of preferred embodiment of the present invention, the fixture 20 includes pedestal 21, and the lower surface 21 of pedestal is plane, base
The upper surface 22 of seat is laid with multiple placement racks 23, multiple 23 parallel layings of placement rack, and each placement rack 23 includes being mutually linked
Supporting walls 231 and abutment walls 232, the peak of the supporting walls 231 of each placement rack 23 and the peak of abutment walls 232 be in same
One plane, supporting walls 231 are vertically arranged with abutment walls 232, the folder between 231 place plane of supporting walls and the lower surface 21 of pedestal
Angle is 13 degree, and i.e. angle A is 13 degree in figure.The specific size of supporting walls 231 and abutment walls 232 is set according to slitting 10, is made
Must cut 10 be placed on placement rack 23 after, slitting 10 is stretched out from placement rack 23, and the position of the stretching is grinding part 40.By fixture
20 are placed in two axis grinders and polish so that the grinding part 40 is ground off, to form the second transparent surface 102.
As a kind of preferred embodiment of the present invention, in step D, pitch is coated on supporting walls 231, drip is made by heating
Blueness softening, strip lithium niobate 10 is placed on pitch, makes bitumen solidification by cooling.By coating pitch, on the one hand can
Further slitting is fixed on fixture 20, on the other hand the first anti-reflection film 31 can be protected.
As a kind of preferred embodiment of the present invention, in step E, before being detected to strip lithium niobate 10, made by heating
Pitch softens, and strip lithium niobate 10 is removed, and strip lithium niobate 10 is detected from fixture 20.
As a kind of preferred embodiment of the present invention, lithium niobate blank 1 described in step A is in pie.
As a kind of preferred embodiment of the present invention, the first transparent surface 101 in step A passes through after grinding and polishing, and face shape is better than
λ/4, finish are better than 60-40, and roughness is better than 2 nanometers of root mean square.
As a kind of preferred embodiment of the present invention, the second transparent surface 102 in step E after grinding and polishing, face shape better than λ/
4, finish is better than 60-40, and roughness is better than 2 nanometers of root mean square.
As a kind of preferred embodiment of the present invention, the granular chip in step G includes first transparent surface 101, described
Second transparent surface 102 and the first joint face 103 being formed between first transparent surface 101 and second transparent surface 102,
Second joint face 104,105 and the 4th joint face (being blocked in figure) of third joint face, the first transparent surface 101, the second light transmission
Face 102, the first joint face 103, the second joint face 104,105 and the 4th joint face of third joint face surround column structure.The
One joint face 103 is arranged in parallel with the second joint face 104, and third joint face 105 is arranged in parallel with the 4th joint face, and described first
Transparent surface 101 is vertical with the second joint face 102, and the angle between 102 and second joint face 104 of the second transparent surface (is schemed
In angle B) be 76 degree 58 points to 77 degree 2 points, preferably 77 degree.Spacing between first joint face 103 and the second joint face 104 is
1.23mm to 1.27mm, preferably 1.25mm.Maximum spacing between first transparent surface 101 and second transparent surface 102
For 0.52mm to 0.56mm, preferably 0.54mm.Here, the maximum distance of the first transparent surface 101 and the second transparent surface 102, refers to
It is the first transparent surface 101 and 104 intersecting lens of the second joint face and the second transparent surface 102 and 104 intersecting lens two-phase of the second joint face
The distance between intersection.
As a kind of preferred embodiment of the present invention, first anti-reflection film 31 and second anti-reflection film 32 are magnesium fluoride
Layer.
The product form of the present invention is not limited to this case diagram and embodiment, anyone carries out it the appropriate of similar thinking
Variation or modification all should be regarded as not departing from the patent category of the present invention.
Claims (8)
1. make lithium niobate crystal blade technolgy with abies balsam protective agent, which is characterized in that include the following steps：
A, the processing of lithium niobate blank：Lithium niobate blank is selected, lithium niobate blank has the first transparent surface and the second transparent surface, the
One transparent surface plates the first anti-reflection film after grinding and polishing；
B, disk on blank：Lithium niobate blank after processing of step A is placed on charging tray, the first light transmission is placed up, and second
Light transmission placed face down coats abies balsam protective agent on the first anti-reflection film, and by weight, abies balsam protective agent includes such as the following group
Point：4-6 parts of abies balsam, 2.5 to 3.5 parts of ethyl alcohol, 1.5 to 2.5 parts of ether；
C, it cuts：Lithium niobate blank is cut into strip lithium niobate；
D, upper fixture：Strip lithium niobate is placed on fixture, and the first transparent surface is made to place downward, the second light transmission is put up
It puts；
E, grinding and polishing：Grinding and polishing is carried out to the second transparent surface；
F, plated film：Second transparent surface is wiped, and plated film is carried out to the second transparent surface；
E, it detects：The fastness of the angle of strip lithium niobate, finish, the fastness of the first anti-reflection film and the second anti-reflection film is carried out
Detection；
G, granule is cut：Strip lithium niobate is cut into granular chip.
2. lithium niobate crystal blade technolgy is made with abies balsam protective agent, which is characterized in that the fixture packet as described in claim 1
Pedestal is included, the lower surface of pedestal is plane, and the upper surface of pedestal is laid with multiple placement racks, and each placement rack includes being mutually linked
Supporting walls and abutment walls, supporting walls be vertically arranged with abutment walls, the folder between plane where supporting walls and the lower surface of pedestal
Angle is 13 degree.
3. lithium niobate crystal blade technolgy is made with abies balsam protective agent as claimed in claim 2, which is characterized in that in step D,
Pitch is coated on supporting walls, softens pitch by heating, strip lithium niobate is placed on pitch, pitch is made by cooling
Curing.
4. lithium niobate crystal blade technolgy is made with abies balsam protective agent as claimed in claim 3, which is characterized in that in step E,
Before being detected to strip lithium niobate, soften pitch by heating, strip lithium niobate is removed from fixture.
5. lithium niobate crystal blade technolgy is made with abies balsam protective agent, which is characterized in that in step A as claimed in claim 4
First transparent surface passes through after grinding and polishing, and face shape is better than λ/4, and finish is better than 60-40, and roughness is better than 2 nanometers of root mean square.
6. lithium niobate crystal blade technolgy is made with abies balsam protective agent, which is characterized in that in step E as claimed in claim 5
For second transparent surface after grinding and polishing, face shape is better than λ/4, and finish is better than 60-40, and roughness is better than 2 nanometers of root mean square.
7. lithium niobate crystal blade technolgy is made with abies balsam protective agent, which is characterized in that in step G as claimed in claim 6
Granular chip includes first transparent surface, second transparent surface and is formed in first transparent surface and second light transmission
The first joint face, the second joint face, third joint face and the 4th joint face, the first joint face and the second joint face between face
It being arranged in parallel, third joint face is arranged in parallel with the 4th joint face, and first transparent surface is vertical with the second joint face, and described
Angle between two transparent surfaces and the second joint face is 77 degree, and the spacing between the first joint face and the second joint face is
1.25mm, the maximum spacing between first transparent surface and second transparent surface are 0.54mm.
8. lithium niobate crystal blade technolgy is made with abies balsam protective agent, which is characterized in that described first increases as claimed in claim 7
Permeable membrane and second anti-reflection film are magnesium fluoride layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610623845.5A CN106047171B (en) | 2016-08-02 | 2016-08-02 | Abies balsam protective agent and with abies balsam protective agent make lithium niobate crystal blade technolgy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610623845.5A CN106047171B (en) | 2016-08-02 | 2016-08-02 | Abies balsam protective agent and with abies balsam protective agent make lithium niobate crystal blade technolgy |
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| Publication Number | Publication Date |
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| CN106047171A CN106047171A (en) | 2016-10-26 |
| CN106047171B true CN106047171B (en) | 2018-07-06 |
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| CN201610623845.5A Active CN106047171B (en) | 2016-08-02 | 2016-08-02 | Abies balsam protective agent and with abies balsam protective agent make lithium niobate crystal blade technolgy |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH087255B2 (en) * | 1990-08-30 | 1996-01-29 | 日本碍子株式会社 | Optical magnetic field sensor and manufacturing method thereof |
| US5208876A (en) * | 1991-11-01 | 1993-05-04 | E-Tek Dynamics, Inc. | Optical isolator |
| CN1213318C (en) * | 2002-04-09 | 2005-08-03 | 奥普林克通信公司 | Small sized optical fibre circulator |
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2016
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