CN111505846A - Polarization-independent free space isolator and manufacturing method thereof - Google Patents
Polarization-independent free space isolator and manufacturing method thereof Download PDFInfo
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- CN111505846A CN111505846A CN202010461814.0A CN202010461814A CN111505846A CN 111505846 A CN111505846 A CN 111505846A CN 202010461814 A CN202010461814 A CN 202010461814A CN 111505846 A CN111505846 A CN 111505846A
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- birefringent crystal
- free space
- crystal wedge
- optical
- magneto
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- 230000010287 polarization Effects 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000013078 crystal Substances 0.000 claims abstract description 88
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000001419 dependent effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Classifications
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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
- G02F1/093—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 used as non-reciprocal devices, e.g. optical isolators, circulators
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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 invention relates to a polarization-independent free space isolator and a manufacturing method thereof. An optical component consisting of the first birefringent crystal wedge, the magneto-optic crystal and the second birefringent crystal wedge is fixed in the magnetic sheet. The polarization-independent free space isolator provided by the invention has the advantages of simple manufacturing process, low cost and good performance; and the emission modules are suitable for parallel optical coupling of multi-wavelength high-end active products, such as 4 × 25G,4 × 50G,4 × 100G,8 × 100G and the like.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a polarization-independent free space isolator and a manufacturing method thereof.
Background
The isolator can be divided into a polarization-dependent type and a polarization-independent type according to the polarization-dependent characteristic of the optical isolator, wherein the isolator is also called a Free Space type (Free Space) because no optical fiber input and output exists at two ends of the device, and the isolator is also called an on-line type (In-L ine) because the isolator has the function of isolating reverse interference signals at two ends of the device, particularly the transmitting end of a communication network, so as to ensure the stability of the communication network, and is mainly applied to the semiconductor laser because the light emitted by the semiconductor laser has extremely high linearity.
As shown in fig. 1, a conventional polarization dependent isolator includes a first polarizer 61, a magneto-optical crystal ii 22, and a second polarizer 62. After linearly polarized light incident through the first polarizer 61 passes through the magneto-optical crystal II 22, the polarization direction rotates by 45 degrees and just passes through the second polarizer 62. Due to the nonreciprocal of the magneto-optical effect, the polarized light beam which is reversely transmitted enters from the second polarizer 62 and rotates 45 degrees after passing through the magneto-optical crystal 22, so that the polarized light beam is orthogonal to the polarization direction of the first polarizer 61, and the purpose of optical isolation is achieved. Such a polarization-dependent isolator has a certain requirement on the polarization direction of incident light, and only polarized light having the same polarization direction as that of the first polarizing plate 61 can be incident and passed through.
As shown in FIG. 2, a prior art polarization independent isolator includes a birefringent crystal wedge I12, a magneto-optical crystal III 23, and a birefringent crystal wedge II 32. The incident beam is divided into o light and e light by the birefringent crystal wedge angle piece I12, and two beams of parallel light which are slightly separated are obtained by the compound output of the birefringent crystal wedge angle piece II 32. During reverse transmission, due to the non-reciprocity of the magneto-optical effect, the polarization direction of the light beam passing through the magneto-optical crystal III 23 continuously rotates, the original o light is changed into the e light relative to the birefringent crystal wedge angle piece I12, and the original e light is changed into the o light, so that the light beam is continuously separated in the birefringent crystal wedge angle piece I12, and the isolation effect on the reverse transmission light beam is realized. The manufacturing process of the polarization-independent isolator is complex, large birefringent crystal wedge angle pieces and magneto-optical crystals are required to be cut into small birefringent crystal wedge angle pieces I12, magneto-optical crystals III 23 and birefringent crystal wedge angle pieces II 32, and then the 3 small grains are adhered together. The pasting process is as follows: the birefringent crystal wedge angle piece I12 and the magneto-optic crystal III 23 are firstly adhered together, then the birefringent crystal wedge angle piece II 32 is placed in a magnetic ring, the birefringent crystal wedge angle piece II 32 is close to the magneto-optic crystal III 23, the angle of the birefringent crystal wedge angle piece II 32 is shifted to slightly rotate, the curve of the isolation degree is monitored in a spectrometer, when the index requirement is met, the birefringent crystal wedge angle piece II 32 and the magneto-optic crystal III 23 are adhered and fixed, the adhering process requires that the optical path is free of glue but the contact surface of an optical part needs to be sealed, so the process difficulty is high, and the efficiency is low.
Disclosure of Invention
In view of the above, the present invention is directed to a free space isolator with simple fabrication and bonding processes and no polarization dependence.
In order to achieve the purpose, the invention adopts the following technical scheme:
a polarization independent free space isolator and a manufacturing method thereof are characterized in that: comprises a first birefringent crystal wedge, a magneto-optic crystal, a second birefringent crystal wedge and a magnetic sheet. An optical component consisting of the first birefringent crystal wedge, the magneto-optic crystal and the second birefringent crystal wedge is fixed in the magnetic sheet.
Further, the optical axis of the first birefringent crystal wedge is 0 degree, and the optical axis of the second birefringent crystal wedge is 45 degrees.
Further, the magnetic sheet is square.
Further, the square structure of the magnetic sheet is used for positioning the assembling direction.
Further, the free space isolator is of a polarization independent type.
Further, the free space isolator has zero PMD values in the vertical and horizontal directions.
A method for making a polarization independent free space isolator comprising the steps of:
step S1, the first birefringent crystal wedge, the magneto-optic crystal and the second birefringent crystal wedge are respectively processed into long strips with equal length, and the whole bottom surface or the whole top surface of the non-light-passing surface of the long strip of the first birefringent crystal wedge is marked;
step S2, gluing three strip-shaped optical pieces, namely a first birefringent crystal wedge piece, a magneto-optic crystal wedge piece and a second birefringent crystal wedge piece sequentially from left to right;
step S3, cutting the glued optical strip assembly into small particles with the size required by the design;
and step S4, adding magnetic sheets to the small-particle optical assembly according to the marking direction, and completing the assembly.
Compared with the prior art, the invention has the following beneficial effects: the free space isolator is polarization-independent, is applied to all high-end modules (the polarization directions are only in the horizontal direction and the vertical direction), and has the advantages of simple manufacturing and pasting processes, high efficiency, low cost and good performance.
Drawings
Fig. 1 is a schematic diagram of a conventional polarization dependent isolator.
Fig. 2 is a schematic diagram of a prior art polarization independent isolator.
FIG. 3 is a schematic diagram of a stripe structure of a polarization independent free space isolator according to the present invention.
FIG. 4 is a schematic diagram of a small particle structure of a polarization independent free space isolator in accordance with the present invention.
FIG. 5 is a schematic diagram of a polarization independent free space isolator according to the present invention.
FIG. 6 is a schematic diagram of another polarization independent free space isolator configuration in accordance with the present invention.
Fig. 7 is a schematic diagram of the application of a polarization independent free space isolator in the invention in a transmitting module.
In the figure: the magneto-optical lens comprises a first birefringent crystal wedge strip-1, a magneto-optical crystal strip-2, a second birefringent crystal wedge strip-3, a magnetic sheet-4, a first birefringent crystal wedge-11, a magneto-optical crystal I-21, a second birefringent crystal wedge-31, a PMD compensator-5, a first polarizing sheet-61, a second polarizing sheet-62, a magneto-optical crystal II-22, a birefringent crystal wedge I-12, a birefringent crystal wedge II-32, a magneto-optical crystal III-23, a laser-7, a lens-8 and an isolator-10.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below:
referring to FIGS. 4 and 5, a polarization independent free space isolator includes a first birefringent crystal wedge 11, a magneto-optical crystal I21, a second birefringent crystal wedge 31, and a magnetic sheet 4. The optical axis of the first birefringent crystal wedge piece 11 is 0 degrees, and the optical axis of the second birefringent crystal wedge piece 31 is 45 degrees; the non-light-passing side bottom or top of the first birefringent crystal wedge 11 is marked. The magnetic sheet 4 is square, and the input end face of the magnetic sheet 4 is marked. The optical assembly consisting of the first birefringent crystal wedge 11, the magneto-optical crystal I21 and the second birefringent crystal wedge 31 is fixed in the magnetic sheet 4.
The preparation method comprises the following steps:
referring to fig. 3, first, the first birefringent crystal wedge, the magneto-optic crystal, and the second birefringent crystal wedge are respectively processed into long strips of equal length, which are the first birefringent crystal wedge strip 1, the magneto-optic crystal strip 2, and the second birefringent crystal wedge strip 3, respectively, and the whole bottom surface or the whole top surface of the non-light-passing surface of the first birefringent crystal wedge strip 1 is marked. And then gluing the three strip-shaped optical pieces together in the sequence of a first birefringent crystal wedge strip 1, a magneto-optical crystal strip 2 and a second birefringent crystal wedge strip 3 from left to right.
And finally cutting the glued optical strip assembly into small particles with the size required by design. The diced small particle optical assembly is shown in figure 4.
Referring to fig. 5, the small particle optical assembly of fig. 4 is assembled by attaching the magnetic piece 4 in the direction of the mark, and the first birefringent crystal wedge 11 is on the same side of the mark face of the input end of the magnetic piece 4.
Thus, the input light, whether it is input in the vertical or horizontal direction, has a PMD value of zero.
Referring to fig. 6, when input light is not input in a vertical or horizontal direction, a compensation sheet 5 is added after the second birefringent crystal wedge 31 to compensate PMD so that the PMD value becomes zero.
Referring to fig. 7, a specific application of the polarization independent free space isolator in the transmitting module is shown. The diverging light beam emitted from the laser 7 is changed into a parallel light beam by the lens 8, and the parallel light beam is output by the isolator 10. The reflected light beam is diverged and output after passing through the isolator 10, so that the reflected light can be prevented from influencing the stability of the light source laser, and the precision and the safety of the light source laser are ensured.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A polarization independent free space isolator, comprising: the magneto-optical lens comprises a first birefringent crystal wedge angle sheet, a magneto-optical crystal, a second birefringent crystal wedge angle sheet and a magnetic sheet; an optical component consisting of the first birefringent crystal wedge, the magneto-optic crystal and the second birefringent crystal wedge is fixed in the magnetic sheet.
2. A polarization independent free space isolator as claimed in claim 1, wherein: the optical axis of the first birefringent crystal wedge is 0 degree, and the optical axis of the second birefringent crystal wedge is 45 degrees.
3. A polarization independent free space isolator as claimed in claim 1, wherein: the magnetic sheet is square.
4. A polarization independent free space isolator according to claim 3, wherein: the square structure of the magnetic sheet is used for positioning the assembling direction.
5. A polarization independent free space isolator as claimed in claim 1, wherein: the free space isolator is of a polarization independent type.
6. A polarization independent free space isolator as claimed in claim 1, wherein: the PMD value of the free space isolator in the vertical direction and the horizontal direction is zero.
7. A method of fabricating a polarization independent free space isolator according to any one of claims 1 to 6, wherein: the method comprises the following steps:
step S1, the first birefringent crystal wedge, the magneto-optic crystal and the second birefringent crystal wedge are respectively processed into long strips with equal length, and the whole bottom surface or the whole top surface of the non-light-passing surface of the long strip of the first birefringent crystal wedge is marked;
step S2, gluing three strip-shaped optical pieces, namely a first birefringent crystal wedge piece, a magneto-optic crystal wedge piece and a second birefringent crystal wedge piece sequentially from left to right;
step S3, cutting the glued optical strip assembly into small particles with the size required by the design;
and step S4, adding magnetic sheets to the small-particle optical assembly according to the marking direction, and completing the assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010461814.0A CN111505846A (en) | 2020-05-27 | 2020-05-27 | Polarization-independent free space isolator and manufacturing method thereof |
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| CN202010461814.0A CN111505846A (en) | 2020-05-27 | 2020-05-27 | Polarization-independent free space isolator and manufacturing method thereof |
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| CN202010461814.0A Pending CN111505846A (en) | 2020-05-27 | 2020-05-27 | Polarization-independent free space isolator and manufacturing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6049425A (en) * | 1996-07-02 | 2000-04-11 | Shin-Etsu Chemical Co., Ltd. | Multiple-stage optical isolator |
| JP2001264694A (en) * | 2000-03-15 | 2001-09-26 | Shin Etsu Chem Co Ltd | Polarized wave independent optical isolator |
| US6600601B1 (en) * | 1999-04-12 | 2003-07-29 | Shin-Etsu Chemical Co., Ltd. | Polarization-independent optical isolator and production method thereof |
| US20130050824A1 (en) * | 2011-08-25 | 2013-02-28 | Smm Precision Co., Ltd. | Polarization independent optical isolator |
| CN105044936A (en) * | 2015-07-08 | 2015-11-11 | 中国科学院理化技术研究所 | Polarization-independent type photo-isolator and magneto-optical crystal device manufacturing method |
-
2020
- 2020-05-27 CN CN202010461814.0A patent/CN111505846A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6049425A (en) * | 1996-07-02 | 2000-04-11 | Shin-Etsu Chemical Co., Ltd. | Multiple-stage optical isolator |
| US6600601B1 (en) * | 1999-04-12 | 2003-07-29 | Shin-Etsu Chemical Co., Ltd. | Polarization-independent optical isolator and production method thereof |
| JP2001264694A (en) * | 2000-03-15 | 2001-09-26 | Shin Etsu Chem Co Ltd | Polarized wave independent optical isolator |
| US20130050824A1 (en) * | 2011-08-25 | 2013-02-28 | Smm Precision Co., Ltd. | Polarization independent optical isolator |
| CN105044936A (en) * | 2015-07-08 | 2015-11-11 | 中国科学院理化技术研究所 | Polarization-independent type photo-isolator and magneto-optical crystal device manufacturing method |
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