CN1488962A - Photoswitch - Google Patents
Photoswitch Download PDFInfo
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- CN1488962A CN1488962A CNA021349428A CN02134942A CN1488962A CN 1488962 A CN1488962 A CN 1488962A CN A021349428 A CNA021349428 A CN A021349428A CN 02134942 A CN02134942 A CN 02134942A CN 1488962 A CN1488962 A CN 1488962A
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- light
- beam apparatus
- polarization beam
- photoswitch
- liquid crystal
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Abstract
The optical switch comprises first polarization beam splitter, second polarization beam splitter, two pieces of liquid crystal and two reflector prisms. The first polarization beam splitter divides incident light into two linearly polarized light beams perpendicular to each other, and passing through a piece of liquid crystal and a reflector prism respectively. Controlling electrical on/off position of the piece of liquid crystal can control polarization status of linearly polarized light passing through the piece of liquid crystal. Thus, output light of two linearly polarized light beams composited by second polarization beam splitter is output from different output port.
Description
[technical field]
The present invention relates to a kind of photoswitch that is used for the optical communication field, especially about a kind of non-mechanical optical switch.
[background technology]
Photoswitch is a kind of each channel in optical transmission line or the integrated optical circuit to be changed or the passive device of logical operation mutually, it is widely used in optical fiber telecommunications system, optical fiber network system, optical fiber measurement system and the optical fiber sensing system, is one of crucial optical device in the optical communication field.
According to the principle of work of photoswitch, it can be divided into mechanical optical switch and non-mechanical optical switch two big classes.Mechanical optical switch utilization machinery, electromagnetic mode are moved optical fiber or optical element, thereby realize the switching of light beam between different output ports.
United States Patent (USP) the 5th, 724 has disclosed a kind of existing photoswitch 40 No. 165.With reference to Fig. 5 a and Fig. 5 b, this photoswitch 40 comprises 402,406, polarization beam apparatus of 401,403,407, two polarization rotation array of 41,42, three birefringence elements of two input ports 404, prism 405 and two output ports 43,44.This photoswitch is realized the switching of light path by the rotation of polarization rotation array 402,406.With reference to Fig. 5 a, when two polarization rotation array 402,406 are in first state, the incident light that sends from first input end mouth 41 passes through first birefringence element 401, the first polarization rotation array 402, second birefringence element 403, prism 405, the second polarization rotation array 406 and the 3rd birefringence element 407 successively, and from 44 outputs of second output port.The incident light that sends from second input port 42 passes through first birefringence element 401, the first polarization rotation array 402, second birefringence element 403, prism 405, inclined to one side battle array beam splitter 404, the second polarization rotation array 406 and the 3rd birefringence element 407 successively, and from 43 outputs of first output port.With reference to Fig. 5 b, when two polarization rotation array 402,406 are in second state, the incident light that sends from first input end mouth 41 passes through first birefringence element 401, the first polarization rotation array 402, second birefringence element 403, polarization beam apparatus 404, the second polarization rotation array 406 and the 3rd birefringence element 407 successively, and from 43 outputs of first output port.The incident light that sends from second input port 42 passes through first birefringence element 401, the first polarization rotation array 402, second birefringence element 403, prism 405, the second polarization rotation array 406 and the 3rd birefringence element 407 successively, and from 44 outputs of second output port.
But this existing photoswitch has some defectives.At first, realize by rotatory polarization rotation array 402,403, make the complicated operation of photoswitch because the light path of this photoswitch 40 is switched.Secondly, the element that light need pass through from the input end to the output terminal is more, thereby makes the optical property variation of photoswitch, and for example, optical attenuation is bigger.
[summary of the invention]
The object of the present invention is to provide a kind of preferable photoswitch of any optical element and optical property that need not move.
For realizing purpose of the present invention, photoswitch of the present invention comprises first polarization beam apparatus, second polarization beam apparatus, two LCD panel and two reflecting prisms.First polarization beam apparatus is divided into the orthogonal linearly polarized light of two bundles with incident light, this two bunch polarized light is respectively by a LCD panel and a reflecting prism, "on" position may command by the control LCD panel is passed through the linear polarization polarized state of light of LCD panel, thereby realizes that this two bunch polarized light penetrates from different output ports through the synthetic output light of second polarization beam apparatus.
Compared with prior art, the present invention realizes the switching of light path by the "on" position of control LCD panel, it need not move any optical element to realize the switching of light path, thereby make simple to operate, and the element that light need pass through from the input end to the output terminal is less, thereby makes that the optical property of photoswitch is preferable.
[description of drawings]
Fig. 1 is the stereographic map of photoswitch of the present invention.
Fig. 2 a-2d is the light path synoptic diagram of photoswitch shown in Figure 1.
Fig. 3 is the stereographic map of another embodiment of photoswitch of the present invention.
Fig. 4 is the stereographic map of another embodiment of photoswitch of the present invention.
Fig. 5 a-5b is the synoptic diagram of existing photoswitch.
[embodiment]
Please refer to Fig. 1, photoswitch 10 of the present invention comprises one first polarization beam apparatus 101, one first LCD panel 103, one second LCD panel 106, one first triangular prism 102, one second triangular prism 105 and one second polarization beam apparatus 104.Photoswitch 10 can make the input light that sends from two input ports 11 and 12 optionally transfer to two output ports 13 and 14.
First polarization beam apparatus 101 of photoswitch 10 of the present invention is used for beam split, and second polarization beam apparatus 104 is used for closing light.The structure of polarization beam apparatus 101,104 is identical, is all formed by the gluing knot by two blocks of triangle glass sheet.Polarization beam apparatus 101,104 is made by BK7, SF5 or other optical glass material, and its outside surface scribbles the anti-reflective film that improves the polarization beam apparatus optical property.When light is incident to first polarization beam apparatus 101, be divided into the orthogonal linearly polarized light of two bundles at the gluing place of two glass sheet: horizontal linear polarization light and perpendicular linear polarization light, and perpendicular linear polarization light is reflected the gluing place of horizontal linear polarization light transmission by gluing place.Two bunch polarized lights penetrate from two surfaces of first polarization beam apparatus 101 respectively.When the orthogonal linearly polarized light of two bundles respectively when two particular surface of second polarization beam apparatus 104 are injected, perpendicular linear polarization light is reflected in gluing place, and with a branch of light of horizontal linear polarization light compositing that sees through.
The LCD panel 103,106 of photoswitch 10 and a control center (figure does not show) electrically connect.Control center controls the "on" position of this LCD panel 103,106, thereby control is by the linear polarization polarized state of light of each LCD panel 103,106.The state that is in out when LCD panel, when promptly being in the state of energising, the linearly polarized light polarization state by LCD panel does not change.When LCD panel is in the state of pass, when promptly being in cold state, the linearly polarized light polarization state by LCD panel changes, and perpendicular linear polarization light becomes horizontal linear polarization light after by LCD panel, and horizontal linear polarization light becomes perpendicular linear polarization light after by LCD panel.
First polarization beam apparatus 101, first triangular prism 102, second polarization beam apparatus 104 and second triangular prism 105 of photoswitch 10 of the present invention are arranged on rectangular four summits in the direction of the clock.First LCD panel 103 is between first triangular prism 102 and second polarization beam apparatus 104.Second LCD panel 106 is between first polarization beam apparatus 101 and second triangular prism 105.Two input ports 11 and 12 are adjacent to two surfaces of first polarization beam apparatus 101 respectively, and two output ports 13 and 14 are adjacent to two surfaces of second polarization beam apparatus 104 respectively.The incident light that sends from input port 11,12 optionally transfers to output port 13,14 via photoswitch 10.Transfer to output port 13,14 accurately in order to make from the light of second polarization beam apparatus, 104 outgoing, one focusing that is made of condenser lens 107 and depth-graded index lens 108 time combination is set respectively between second polarization beam apparatus 104 and output port 13,14, and condenser lens 107 contiguous second polarization beam apparatus 104, depth-graded index lens 108 contiguous output ports 13,14.
Please refer to Fig. 2 a-2d, disclosed the index path of photoswitch 10.Fig. 2 a and Fig. 2 b have disclosed the index path when photoswitch 10 is in first state respectively.The state that two LCD panel 103,106 of photoswitch 10 are in out, promptly LCD panel is in the state of energising.The first surface 1011 of first polarization beam apparatus 101 of input beam 111 input optical switches 10 that send from first port one 1, because the effect of polarization beam apparatus, it is divided into two bunch polarized lights 112,113.First linearly polarized light 112 is a perpendicular linear polarization light, penetrates from the 3rd surface 1013 of first polarization beam apparatus 101.Second linearly polarized light 113 is a horizontal linear polarization light, penetrates from the 4th surface 1014 of first polarization beam apparatus 101.The state that is in out because of LCD panel 103,106, via first linearly polarized light 112 of first triangular prism 102 reflection by after first LCD panel 103, its polarization state is constant, still is orthogonal polarized light, and it is incident to the 3rd surface 1043 of second polarization beam apparatus 104.In like manner, second linearly polarized light 113 is by after second LCD panel 106, and its polarization state is constant, still is horizontal polarization light.It is incident to the 4th surface 1044 of second polarization beam apparatus 104 after 105 reflections of second triangular prism.Second polarization beam apparatus 104 synthesizes a branch of light 116 with this two bunch polarized light, and penetrates from the first surface 1041 of second polarization beam apparatus 104, further transports to first output port 13.Be divided into perpendicular linear polarization light 123 and horizontal linear polarization light 122 when in like manner, the incident light 121 that sends from second input port 12 is by first polarization beam apparatus 101.By LCD panel 106 and 103, its polarization state is constant respectively for this two bunch polarized light 123,122.When this two bundles polarized light 123,122 transferred to second polarization beam apparatus 104 respectively, two-beam synthesized a branch of output light 126, and penetrated from the second surface 1042 of polarization beam apparatus 104, further from 14 outputs of second output port.
Index path when Fig. 2 c and Fig. 2 d have pointed out photoswitch to be in second state respectively.Two LCD panel 103,106 of photoswitch 10 are in the state of pass, and promptly LCD panel is in the not state of energising.The first surface 1011 of first polarization beam apparatus 101 of input beam 111 input optical switches 10 that send from first port one 1, because the effect of polarization beam apparatus, it is divided into perpendicular linear polarization light 112 and horizontal linear polarization light 113.Because of LCD panel 103,106 is in the state of pass, perpendicular linear polarization light 112 through first LCD panel 103 after, become horizontal linear polarization 114, horizontal linear polarization 113 through first LCD panel 106 after, become perpendicular linear polarization light 115.Two linearly polarized lights 114,115 are incident to the 1043 and the 4th surface 1044, the 3rd surface of second polarization beam apparatus 104 respectively.Second polarization beam apparatus 104 is with these two bunch polarized light, 114,115 synthetic a branch of light 117, and its second surface 1042 from second polarization beam apparatus 104 penetrates, and further transports to second output port 14.The incident light 121 that sends from second input port 12 is divided into perpendicular linear polarization light 123 and horizontal linear polarization light 122 during by first polarization beam apparatus 101, two bunch polarized lights are respectively by LCD panel 106 and 103, its polarization state changes, and becomes horizontal linear polarization light 125 and perpendicular linear polarization light 124 respectively.When this two bunch polarized light 125,124 transferred to second polarization beam apparatus 104, two-beam synthesized a branch of light 127, and penetrated from the first surface 1041 of polarization beam apparatus, further from 13 outputs of first output port.
Please refer to Fig. 3,, a plurality of photoswitches 10 can be constituted a combined light switch 20 in order to increase the output port of photoswitch.Combined light switch 20 links to each other with an input port of a back one-level photoswitch 10 respectively by two output ports with previous stage photoswitch 10 and constitutes, thereby has two input ports and four output ports.Be appreciated that ground, the photoswitch 10 of can further connecting on the basis of combined light switch 20 is to increase output port.
Please refer to Fig. 4,, two combined light switches 20 can be constituted a multiple layer combination photoswitch 30 side by side for input port and the output port that increases photoswitch.This multiple layer combination photoswitch 30 has four input ports and eight output ports.
In the aforesaid photoswitch 10, can there be multiple situation the position of LCD panel, for example, first LCD panel 103 can be between first polarization beam apparatus 101 and first triangular prism 102, and second LCD panel 106 can be between second polarization beam apparatus 104 and second triangular prism 105.In addition, triangular prism 102,105 is the light path modifier of the light path that is used to change the light that sends from first polarization beam apparatus, this light path modifier also can be replaced by other optical element that optical path direction is changed, or adopts photoconduction leading-in device (as optical fiber) to realize that optical path direction changes.
Claims (10)
1. photoswitch, comprise a first input end mouth, one first polarization beam apparatus, one first polarization conversion device, one second polarization conversion device, one second polarization beam apparatus and two output ports, it is characterized in that: this is first years old, second polarization conversion device is a liquid crystal cell, the light that sends from the first input end mouth is divided into two bundle polarized lights during by first polarization beam apparatus, separately by transporting to second polarization beam apparatus and synthetic a branch of output light behind the liquid crystal cell, when two liquid crystal cells all are in first state, export from first output terminal from the input light that the first input end mouth sends, when two liquid crystal cells all are in second state, export from second output terminal from the input light that the first input end mouth sends.
2. photoswitch as claimed in claim 1, it is characterized in that this photoswitch further comprises one second input port, the light that sends from second input port is divided into two bundle polarized lights during by first polarization beam apparatus, separately by transporting to second polarization beam apparatus and synthetic a branch of output light behind the liquid crystal cell, when liquid crystal cell is in first state, export from second output terminal from the output light that second input port sends, when liquid crystal cell is in second state, export from first output terminal from the output light that second input port sends.
3. photoswitch as claimed in claim 1 or 2 is characterized in that this photoswitch further comprises a light path modifier, is used to change the optical path direction of the two bundle polarized lights that send from first polarization beam apparatus.
4. photoswitch as claimed in claim 3 is characterized in that this light path modifier comprises one first reflecting element and one second reflecting element, and this reflecting element is a triangular prism, places between two polarization beam apparatus.
5. photoswitch as claimed in claim 2 is characterized in that first polarization beam apparatus will be divided into a branch of perpendicular linear polarization light and a branch of horizontal linear polarization light from the input light that first and second input ports send respectively.
6. photoswitch as claimed in claim 5 it is characterized in that first and second polarization beam apparatus are made by BK7, SF5 or other optical glass material, and its outside surface scribbles the anti-reflective film that improves the polarization beam apparatus optical property.
7. photoswitch as claimed in claim 1 or 2, first state and the energising of the corresponding liquid crystal cell of second state difference and the state of not switching on that it is characterized in that liquid crystal cell, when liquid crystal cell is in "on" position, the polarized light that sends from first polarization beam apparatus is during by this liquid crystal cell, polarization state is constant, and when liquid crystal cell was in not "on" position, the polarized light that sends from first polarization beam apparatus was during by this liquid crystal cell, and polarization state changes.
8. photoswitch as claimed in claim 7 is characterized in that this liquid crystal cell is connected to a central processing unit, and this central processing unit is used for controlling the "on" position of liquid crystal cell.
9. photoswitch as claimed in claim 1 or 2 is characterized in that it comprises that further two are assembled combination, and it lays respectively between the output port and second polarization beam apparatus.
10. photoswitch as claimed in claim 9 is characterized in that arbitrary convergence combination comprises that all one assembles lens and a gradient gradual index lens, contiguous second polarization beam apparatus of this convergent lens, the contiguous output port of this gradient gradual index lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021349428A CN1488962A (en) | 2002-10-10 | 2002-10-10 | Photoswitch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021349428A CN1488962A (en) | 2002-10-10 | 2002-10-10 | Photoswitch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1488962A true CN1488962A (en) | 2004-04-14 |
Family
ID=34146014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021349428A Pending CN1488962A (en) | 2002-10-10 | 2002-10-10 | Photoswitch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1488962A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401120C (en) * | 2004-08-19 | 2008-07-09 | 冲电气工业株式会社 | Optical switch |
| CN101021597B (en) * | 2007-02-16 | 2010-05-26 | 浙江大学 | Micro phase delay capacity light delay linear array switch |
-
2002
- 2002-10-10 CN CNA021349428A patent/CN1488962A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401120C (en) * | 2004-08-19 | 2008-07-09 | 冲电气工业株式会社 | Optical switch |
| CN101021597B (en) * | 2007-02-16 | 2010-05-26 | 浙江大学 | Micro phase delay capacity light delay linear array switch |
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