CN1270198C - Combination component with three ports for light polarization - Google Patents
Combination component with three ports for light polarization Download PDFInfo
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- CN1270198C CN1270198C CN 02150415 CN02150415A CN1270198C CN 1270198 C CN1270198 C CN 1270198C CN 02150415 CN02150415 CN 02150415 CN 02150415 A CN02150415 A CN 02150415A CN 1270198 C CN1270198 C CN 1270198C
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- polarization
- polarization state
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Abstract
The present invention discloses a combination element with three ports for light polarization, which is used for a wavelength multi-task light fiber transmission system with high density. The present invention comprises: two birefringent crystals, a Faraday rotary crystal, a half-wave sheet and a birefringent crystal, wherein the two birefringent crystals are arranged at a second light port and on one side of a third light port, can receive two light rays crossed by a polarization state transmitted by the two input light ports, and one of the light rays generates one excursion; the Faraday rotary crystal receives the two light rays crossed by the polarization state transmitted by the pair of birefringent crystals, and the polarization state is rotated for a predetermined angle to be existed; the half-wave sheet receives a light ray existed by the Faraday rotary crystal, and the polarization state of the light ray is rotated in a reverse direction for the predetermined angle to be existed; the birefringent crystal receives the two light rays crossed by the polarization state existed from the half-wave sheet on one side of the first light port, and the two light rays are combined into one exit light ray to enter the first light port; through the irreversible characteristic of the half-wave sheet and the Faraday rotary crystal, noise in the reverse direction can be isolated, system quality is improved, and a laser is protected.
Description
Technical field
The present invention relates to a kind of three port light polarization binding members, be applied in the high density wavelength multitask fibre-optic transmission system (FOTS), particularly a kind of as the high power colligator of passive type and three port light polarization binding members with isolated reverse noise function.
Background technology
Present age on the occasion of information explosion, the circulation of information, transmission often become win victory maximum crucial, and the flourish of internet is the One Earth One Family village with whole world contact more, what distance that the person to person that furthered links up each other and information were transmitted popularizes and speed, therefore, the transmission distance of information and the flow of data constantly increase, and higher light power requirements also just becomes more and more important, and can cater to this trend.
Erbium-Doped Fiber Amplifier (EDFA) (EDFA) also just becomes more important because of such demand with raman amplifier (Raman Amplifier); But because the power of laser still is apparent not enough at present, just must lay one group of Erbium-Doped Fiber Amplifier (EDFA) (EDFA) and raman amplifier (RamanAmplifier) for about about 40 kilometers so transmit distance, cause the cost of fibre optic transmission equipment can not to be in any more, inconvenient especially in the maintenance.
In order to solve such problem, develop and a kind of three port passive devices with luminous power combined function, the collocation LASER Light Source, the pivotal player of playing the part of a high laser power colligator, reach higher power and supply the Erbium-Doped Fiber Amplifier (EDFA) (EDFA) and the pump of raman amplifier (Raman Amplifier) to originate, the light obstructing instrument of more can arranging in pairs or groups simultaneously intercepts noise light reverse in the Fiber Optical Communication System, further improves the quality of system.
For such element is provided, preceding case has proposed many different practices, announce patent No. 6331913 as the U.S., although possessing, it have polarized light to synthesize and the function of separating, but structure is but quite complicated, the height that cost is still suitable, and volume is also quite huge, and the function that does not have reverse obstruct needs the extra light obstructing instrument that increases.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of three port light polarization binding members are provided, and is connected in three optical ports, and the high power binding characteristic can be provided, and volume is little simultaneously, cost is low.
Another object of the present invention provides a kind of three port light polarization binding members with reverse noise insulation function.
To achieve these goals, the invention provides a kind of three port light polarization binding members, be installed between one first optical port, one second optical port and one the 3rd optical port, and this second optical port and the 3rd optical port are positioned at homonymy, be characterized in that this three ports light polarization binding member includes:
One non-spherical lens is installed in this second optical port and the 3rd optical port one side, can receive the light of the two polarization state quadratures that this second optical port and the 3rd optical port spread out of, and its deviation is spread out of;
One cumeat can receive the light of the two polarization state quadratures that this non-spherical lens spreads out of, and its deviation is outwards spread out of; And
One birefringece crystal is engaged in this cumeat and is installed in this first optical port, one side, can accept the light of the two polarization state quadratures that spread out of from this cumeat, and makes it close optically-coupled to enter this first optical port.
The present invention also provides another kind of three port light polarization binding members, be installed between one first optical port, one second optical port and one the 3rd optical port, and this second optical port and the 3rd optical port are positioned at homonymy, are characterized in, this three ports light polarization binding member includes:
Two spherical lenses correspond respectively between this second optical port and the 3rd optical port and install, and can receive the light of the two polarization state quadratures that this second optical port and the 3rd optical port spread out of respectively, and its deviation is outwards spread out of; And
One birefringece crystal is installed between this first optical port and this two spherical lens, can accept the light of the two polarization state quadratures that spread out of from this two spherical lens, and makes it close optically-coupled to enter this first optical port.
The third three ports light polarization binding member provided by the invention, be installed between one first optical port, one second optical port and one the 3rd optical port, and this second optical port and the 3rd optical port are positioned at homonymy, are characterized in, this three ports light polarization binding member includes:
Two birefringece crystals, be installed in this second optical port and the 3rd optical port one side, can receive respectively two light that import into from this second optical port and the 3rd optical port, and one of them produces a skew to make described two light, wherein the polarization state quadrature of the light that imports into of light that imports into from this second optical port and the 3rd optical port;
One faraday's rotating crystal can receive the light of the two polarization state quadratures that described two birefringece crystals are spread out of, and makes the polarization state of this light rotate a prearranged angle;
Half of wave plate can receive this light of this faraday's rotating crystal institute outgoing, and makes this prearranged angle of polarization state reverse rotation of this light; And
One birefringece crystal is installed in this first optical port, one side, can accept the light from this two polarization states quadrature of this half-wave plate outgoing, and this two light is closed light is that an emergent ray is coupled into this first optical port;
Beam split is the light of two polarization state quadratures by this birefringece crystal wherein to be incident in the light of this birefringece crystal by this first optical port, and make its polarization state rotate this predetermined angular by this half-wave plate, and by the nonreversibility of this faraday's rotating crystal, make the light of this two polarization states quadrature continue this predetermined angular of rotation, and the light that makes this two polarization states quadrature is subjected to being different from the skew of the light of the two polarization state quadratures that this second optical port and the 3rd optical port imported into, can't be coupled into this second optical port and the 3rd optical port.
A kind of three port light polarization binding members provided by the invention; can be with the light of two polarization state quadratures; close light and by another optical port outgoing; the present invention simultaneously adds half-wave plate and faraday's rotating crystal on light path; utilize its irreversible characteristic; make reverse noise light produce different refraction path directions and completely cut off, protect laser effectively, and the quality of raising light transmission.
For purpose of the present invention, structural attitude and function thereof are had further understanding, existing conjunction with figs. is described in detail as follows.
Description of drawings
Fig. 1 is the first embodiment synoptic diagram of the two-way three port light polarization binding members of the present invention;
Fig. 2 is the second embodiment synoptic diagram of the two-way three port light polarization binding members of the present invention;
Fig. 3 A is the synoptic diagram of the first embodiment bonding state of the unidirectional three port light polarization binding members of the present invention;
Fig. 3 B is the polarization state synoptic diagram of Fig. 3 A of the present invention;
Fig. 4 A is the first embodiment released state synoptic diagram of the two-way three port light polarization binding members of the present invention;
Fig. 4 B is the polarization state synoptic diagram of Fig. 4 A of the present invention;
Fig. 5 A is the second embodiment bonding state synoptic diagram of the two-way three port light polarization binding members of the present invention; And
Fig. 5 B is the second embodiment released state synoptic diagram of the two-way three port light polarization binding members of the present invention.
Embodiment
The disclosed three port light polarization binding members according to the present invention, as shown in Figure 1, include birefringece crystal 10, cumeat 20 and non-spherical lens 30, birefringece crystal 10 1 sides are that first optical port, 11 opposite sides fit in cumeat 20, and in birefringece crystal 10, and aspheric surface crystal 30 places between cumeat 20 and second optical port 12, the 3rd optical port 13 cumeat 20 with its plane engagement.After making that respectively first light 101 by 11 outgoing of first optical port enters birefringece crystal 10, can be subjected to its beam split is second light 102 and the 3rd light 103 of two polarization state quadratures, then enters cumeat 20 deviations change shooting angle and then enters aspheric surface crystal 30 deviation and be coupled into second optical port 12 and the 3rd optical port 13.Reverse operating can make by second light 102 of the polarization state quadrature of second optical port 12 and 13 outgoing of the 3rd optical port and the 3rd light 103 characteristic of element thus, in conjunction with and enter first optical port 11.This is first embodiment of two-way three port light polarization binding members.
As shown in Figure 2, second embodiment for the two-way three port light polarization binding members of the present invention, include a birefringece crystal 10 and two spherical lens 31a, 31b, be arranged between first optical port 11, second optical port 12 and the 3rd optical port 13, and birefringece crystal 10 is arranged at the side near first optical port 11, and spherical lens 31a, 31b are arranged at the side near second optical port 12 and the 3rd optical port 13.After being incident in birefringece crystal 10 by first light 101 of first optical port, 11 outgoing, can beam split be second light 102 and the 3rd light 103 of two polarization state quadratures, after entering spherical lens 31a, 31b respectively, deviation and be coupled into second optical port 12 and the 3rd optical port 13.Same reverse operating can make by second light 102 of the polarization state quadrature of second optical port 12 and 13 outgoing of the 3rd optical port and the 3rd light 103 characteristic of element thus, in conjunction with and enter first optical port 11.Above-described two embodiment, be two-way three port polarized light binding members of the present invention, because the characteristic that it is two-way, also can be used as three port polarization separating elements, therefore, if be applied in the Fiber Optical Communication System, the smooth obstructing instrument (not shown) of still must arranging in pairs or groups intercepts reverse noise light.
First embodiment of the unidirectional three port polarized light binding members of the present invention, as shown in Figure 3A, and please refer to Fig. 3 B simultaneously, polarization state synoptic diagram for the sectional position between each unit of light among Fig. 3 A, at first second light 102 and the 3rd light 103 by second optical port 12 and 13 incidents of the 3rd optical port is the light of two polarization state quadratures, be incident in two birefringent wedge crystal 6 0a respectively, inclined-plane one side of 60b, making wherein, the light of a certain polarization state can be subjected to a skew, then be incident in faraday's rotating crystal 50, after passing through, light can rotate a predetermined angle, and by the same predetermined angular of meeting reverse rotation behind the half-wave plate 40, and make that the polarization state of the light that this direction is passed through is constant, shown in Fig. 3 B.And its predetermined angular is good with 45 degree, so the angle of the optical axis of half-wave plate 40 and incident light polarization direction is 22.5 degree, and the magnetic direction of faraday's rotating crystal 50 promptly for this reason.For instance, if second light is odd number light (o-ray) for birefringent wedge crystal 6 0a, when light passes through, can advance along original route, and the 3rd light 103 is even number light (e-ray) for birefringent wedge crystal 6 0b, by the time have a displacement, during then successively by faraday's rotating crystal 50 and half-wave plate 40, after 45 degree that are subjected to respectively counterclockwise and turn clockwise, and get back to former polarization state, be subjected to the light action that closes of birefringece crystal 10 at last, be combined into first light 10 and be coupled into first optical port 11.
When contrary operation, as Fig. 4 A, shown in Fig. 4 B, by first light 101 of first optical port, 11 outgoing during by birefringece crystal 10, can be second light 102 (being assumed to be o-ray) and the 3rd light 103 (being assumed to be e-ray) of two polarization state quadratures by beam split, follow incident half-wave plate 40, because the characteristic that it is reversible, can make the polarization state of two light be rotated counterclockwise 45 degree (the same) with the sense of rotation of reverse incident, yet faraday's rotating crystal 50 has irreversible characteristic, therefore after passing through, its polarization state can be rotated 45 degree again, and with incident before differ 90 the degree, therefore second light 102 of incident birefringent wedge crystal 6 0a is even number light (e-ray), and the 3rd light 103 of incident birefringent wedge crystal 6 0b is even number light (o-ray), makes second light 102 be subjected to a skew, and inequality with the path of original incident, in like manner, the 3rd light 103 is also different with former incident path.Make that the angle of second light 102 and the 3rd light 103 is θ 2, be different from the angle theta 1 (seeing Fig. 3 A) of second optical port 12 and the 3rd optical port 13, and can't be coupled into second optical port 12 and the 3rd optical port 13.Therefore can reach the function that stops reverse light effectively.
Second embodiment of the unidirectional three port light polarization binding members of the present invention, shown in Fig. 5 A, Fig. 5 B, cardinal principle is identical with first embodiment (Fig. 4 A, 4B) of unidirectional three port light polarization binding members, and utilize-Wollaston (Wollaston) lens 70 replacement birefringent wedge crystal 6 0a, 60b, it mainly is horizontally to be made of two optical axises vertical birefringent wedge crystal 70a, 70b, its inclined-plane is relative, and passes through in regular turn for light.Can produce skew to the light of a certain polarization state equally, cooperating faraday's rotating crystal 50 irreversible characteristics, also can reach the function that stops reverse noise light, and this wollaston lens can be controlled the offset distance that this light passes through by adjusting the angle of wedge shape.
A kind of three port light polarization binding members provided by the invention can be with the light of two polarization state quadratures, closes light and by another optical port outgoing; simultaneously, by the irreversible characteristic of half-wave plate and faraday's rotating crystal, and can completely cut off reverse noise; improve system quality, and protection laser.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; All equivalences of being done according to instructions of the present invention and accompanying drawing content change and modify, and all are included in the claim of the present invention.
Claims (8)
1. port light polarization binding member, be installed between one first optical port, one second optical port and one the 3rd optical port, and this second optical port and the 3rd optical port are positioned at homonymy, it is characterized in that, this three ports light polarization binding member includes:
Two birefringece crystals, be installed in this second optical port and the 3rd optical port one side, can receive respectively two light that import into from this second optical port and the 3rd optical port, and one of them produces a skew to make described two light, wherein the polarization state quadrature of the light that imports into of light that imports into from this second optical port and the 3rd optical port;
One faraday's rotating crystal can receive the light of the two polarization state quadratures that described two birefringece crystals are spread out of, and makes the polarization state of this light rotate a prearranged angle;
Half of wave plate can receive this light of this faraday's rotating crystal institute outgoing, and makes this prearranged angle of polarization state reverse rotation of this light; And
One birefringece crystal is installed in this first optical port, one side, can accept the light from this two polarization states quadrature of this half-wave plate outgoing, and this two light is closed light is that an emergent ray is coupled into this first optical port;
Beam split is the light of two polarization state quadratures by this birefringece crystal wherein to be incident in the light of this birefringece crystal by this first optical port, and make its polarization state rotate this predetermined angular by this half-wave plate, and by the nonreversibility of this faraday's rotating crystal, make the light of this two polarization states quadrature continue this predetermined angular of rotation, and the light that makes this two polarization states quadrature is subjected to being different from the skew of the light of the two polarization state quadratures that this second optical port and the 3rd optical port imported into, can't be coupled into this second optical port and the 3rd optical port.
2. three port light polarization binding members as claimed in claim 1, it is characterized in that, this two birefringece crystal is the birefringece crystal of two wedge shapes, and towards this second optical port and the parallel storing of the 3rd optical port, and import light into for this second optical port and the 3rd optical port respectively with chamfered edge.
3. three port light polarization binding members as claimed in claim 1 is characterized in that the optical axis of this two birefringece crystal is vertical mutually.
4. three port light polarization binding members as claimed in claim 1 is characterized in that this two birefringece crystal is a wollaston lens.
5. three port light polarization binding members as claimed in claim 4 is characterized in that this wollaston lens has two parts, and the light that this second optical port and the 3rd optical port are exported is all successively by described two parts.
6. three port light polarization binding members as claimed in claim 4 is characterized in that, this wollaston lens can be controlled the offset distance that this light passes through by adjusting the angle of wedge shape.
7. three port light polarization binding members as claimed in claim 1 is characterized in that, this predetermined angle is 45 degree.
8. three port light polarization binding members as claimed in claim 7 is characterized in that, the polarization state angle of the optical axis of this half-wave plate and this light is 22.5 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02150415 CN1270198C (en) | 2002-11-08 | 2002-11-08 | Combination component with three ports for light polarization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02150415 CN1270198C (en) | 2002-11-08 | 2002-11-08 | Combination component with three ports for light polarization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1499227A CN1499227A (en) | 2004-05-26 |
| CN1270198C true CN1270198C (en) | 2006-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02150415 Expired - Fee Related CN1270198C (en) | 2002-11-08 | 2002-11-08 | Combination component with three ports for light polarization |
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| CN (1) | CN1270198C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015230163A (en) * | 2014-06-03 | 2015-12-21 | 株式会社東芝 | Optical voltage measurement device |
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- 2002-11-08 CN CN 02150415 patent/CN1270198C/en not_active Expired - Fee Related
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| CN1499227A (en) | 2004-05-26 |
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