CN102841396A - Light filter device - Google Patents
Light filter device Download PDFInfo
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- CN102841396A CN102841396A CN2011101681459A CN201110168145A CN102841396A CN 102841396 A CN102841396 A CN 102841396A CN 2011101681459 A CN2011101681459 A CN 2011101681459A CN 201110168145 A CN201110168145 A CN 201110168145A CN 102841396 A CN102841396 A CN 102841396A
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- optical thickness
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- glass substrate
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Abstract
The invention relates to a light filter device which comprises a glass substrate and a light filter membrane, wherein the light filter membrane is arranged on the glass substrate and is provided with a plurality of cavities with Fabry-Perot resonator (Fabry-Perot resonator) structures formed by high-refraction coatings and low-refraction coatings, which are mutually stacked together; the basic optical thicknesses of the high-refraction coatings and the low-refraction coatings are 1/4 the center wavelength of the incident light; the Fabry-Perot resonator structures are orderly stacked on the glass substrate; each Fabry-Perot resonator structure comprises two high-refraction coatings and a spacer layer between the two high-refraction coatings; the optical thickness of the spacer layer of the Fabry-Perot resonator structure nearest to the glass substrate and the thickness of the spacer layer of the Fabry-Perot resonator structure furthest away from the glass substrate are not less than four times of the basic optical thickness and not more than 14 times of the basic optical thickness.
Description
Technical field
The present invention is relevant with filtering apparatus, more detailed is meant a kind of coarse wavelength division multiplexer (Coarse Wavelength Division Multiplexing, filtering apparatus CWDM) of being used in.
Background technology
Along with computing machine a large amount of popularize the fast development with network technology, utilize network to obtain data fast or service is provided.And the photoelectricity communication can provide fast and the great deal of information transmission, and therefore, opto-electronics receives personage of each stratum and related industry personnel's attention.At present sharply the opto-electronics of development electricity (Electronics) and optics (Optics) are mutually combined and a kind of application of producing, wherein be held in esteem with fiber optic network technology (optical networking) again and look and widespread use.
The fiber optic network technology is that a kind of employing optical fiber (optical fiber) comes the mechanics of communication as data transmission medium, can let come the signal of transportation simulator pattern or digital pattern through laser beam between a plurality of different processing systems (for example being computer system or telephone system).In addition, because laser beam has higher frequency than electric wave, and the loss of laser beam in optical fiber is minimum, so its transmission speed and efficient are much larger than the communication system of traditional wired and wireless type.
And in the fiber optic network technology; Again with coarse wavelength division multiplexer (Coarse Wavelength Division Multiplexing; CWDM) the most often be used; Above-mentioned coarse wavelength division multiplexer passes through the passage of filtering apparatus (Filter) and a plurality of different wave lengths of wavelength multiplexer (multiplexer) integration in same optical fiber, all wavelengths is separated in the different fibers with demodulation multiplexer (demultiplexer) in receiving end.And the filter coating of the employed filtering apparatus of above-mentioned coarse wavelength division multiplexer has Fabry-Perot cavity (Fabry-Perot resonator) structure that plural chamber is formed by high refraction film layer and the mutual storehouse of low refraction rete, and this filter coating is as follows by wherein a kind of structural design of air end (Air) to glass substrate end (NS):
Air/H(LH)^2?2L(HL)^3?H(LH)^3?4L(HL)^3?H(LH)^4?6L(HL)^4?H(LH)^36L(HL)^3?H(LH)^4?6L(HL)^4?H(LH)^3?6L(HL)^3?H(LH)^4?6L(HL)^4?H(LH)^34L(HL)^3?H(LH)^3?2L(HL)^2?H/NS
Wherein, H representes that optical thickness is λ
0/ 4 high refraction film layer; L representes that optical thickness is λ
0/ 4 low refraction rete; λ
0Centre wavelength for incident light;
Using the structural design of utilizing above-mentioned filtering apparatus cooperates last wavelength multiplexer that the passage of a plurality of different wave lengths is integrated in same the optical fiber.
Yet; See also Fig. 1,, can't reduce the stopband (stopband) of each passage effectively though the structural design of above-mentioned filtering apparatus can reach the purpose of integrating passage; Each passage all has its fixing bandwidth (band width); When the stopband of each passage is too big, will with adjacent passage mutual interference mutually, and make the communication quality of fiber optic network technology be affected.
Summary of the invention
The technical matters that the present invention will solve is; Can't effectively reduce the stopband of each passage to filtering apparatus of the prior art; The affected defective of communication quality provides a kind of filtering apparatus, and the structural design of its filter coating can be reduced the stopband (stopband) of each passage effectively.
The technical scheme that the present invention is taked for its technical matters of solution is; A kind of filtering apparatus is provided; Include glass substrate and filter coating, wherein, this filter coating is located on this glass substrate; Have Fabry-Perot cavity (Fabry-Perot resonator) structure that plural chamber is formed by high refraction film layer and the mutual storehouse of low refraction rete, and above-mentioned high refraction film layer is 1/4th centre wavelength (λ of incident light with the basic optical thickness that hangs down the refraction rete
0/ 4); These Fabry-Perot cavity structures are stacked on this glass substrate in regular turn, and respectively this Fabry-Perot cavity structure includes two-layer high reflection mirror rete and the wall of one deck between this two high reflection mirrors rete;
For reaching above-mentioned purpose; In this filter coating near the wall of the Fabry-Perot cavity structure of glass substrate and be not less than 4 times of basic optical thickness away from the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate, and be not more than 14 times of basic optical thickness.
For reaching effect preferably, in this filter coating near the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate be 4 times of basic optical thickness, 6 times of basic optical thickness, 8 times of basic optical thickness, 10 times of basic optical thickness, 12 times of basic optical thickness and 14 times of basic optical thickness wherein one.
For reaching effect preferably, in this filter coating away from the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate be 4 times of basic optical thickness, 6 times of basic optical thickness, 8 times of basic optical thickness, 10 times of basic optical thickness, 12 times of basic optical thickness and 14 times of basic optical thickness wherein one.
By this, utilize above-mentioned structural design, can reduce the stopband of each passage effectively.
Description of drawings
Fig. 1 is each passage mode chart of existing filtering apparatus.
Fig. 2 is the structural representation of filtering apparatus of the present invention.
Fig. 3 is each passage mode chart of filtering apparatus of the present invention.
Embodiment
For being illustrated more clearly in the present invention, lift preferred embodiment now and cooperate diagram to specify as after.
See also Fig. 2, filtering apparatus 1 of the present invention be applicable to coarse wavelength division multiplexer (Coarse Wavelength Division Multiplexing, CWDM).This filtering apparatus 1 includes glass substrate 10 and filter coating 20, in present embodiment, with the central wavelength lambda of incident light
0Be 1530 how rice (nm) for example describes, wherein:
This glass substrate 10 is made up of elements such as monox, barium, lithium, sodium.
This filter coating 20 is located on this glass substrate 10; Have Fabry-Perot cavity (Fabry-Perot resonator) structure 22 that nine chambeies are formed by high refraction film layer and the mutual storehouse of low refraction rete, and respectively this Fabry-Perot cavity structure 22 is made up of two-layer high reflection mirror rete 221 and 222 of the walls of one deck between this two-layer high reflection mirror rete 221.In addition, above-mentioned high refraction film layer is λ with the low basic optical thickness that reflects rete
0/ 4 (are 382.5 how rice), and should process by the monox material by low refraction rete, refractive index is 1.38～1.44, and this high refraction film layer is processed by the tantalum oxide material, and refractive index is 2.1～2.7.
By this, nine chamber Fabry-Perot cavity structures 22 of this filter coating 20 of present embodiment are in regular turn as shown in following:
H(LH)^2?4L(HL)^3；H(LH)^3?4L(HL)^3；H(LH)^4?6L(HL)^4；H(LH)^3?6L(HL)^3；H(LH)^4?6L(HL)^4；H(LH)^3?6L(HL)^3；H(LH)^4?6L(HL)^4；H(LH)^34L(HL)^3；H(LH)^3?4L(HL)^2?H/NS
Wherein, H representes that optical thickness is λ
0/ 4 high refraction film layer; L representes that optical thickness is λ
0/ 4 low refraction rete; NS is a glass substrate;
And difference of the present invention is in this filter coating 20 of this filtering apparatus 1 near the first chamber Fabry-Perot cavity structure 22 of this glass substrate and away from the structural design of the 9th chamber Fabry-Perot cavity structure 22 of this glass substrate.
Can learn by above-mentioned design formula; This first chamber Fabry-Perot cavity structure 22 is H (LH) ^34L (HL) ^2H; Wherein, H (LH) ^3 and (HL) ^2H are the high reflection mirror rete 221 of this first chamber Fabry-Perot cavity structure 22, H (LH) ^3 and (HL) 4L between the ^2H then be the wall 222 of this first chamber Fabry-Perot cavity structure 22.And the 9th chamber Fabry-Perot cavity structure 22 is H (LH) ^2 4L (HL) ^3; Wherein, H (LH) ^2 and (HL) ^3 are the high reflection mirror rete 221 of the 9th chamber Fabry-Perot cavity structure 22, H (LH) ^2 and (HL) 4L between the ^3 then be the wall 222 of the 9th chamber Fabry-Perot cavity structure 22.
By this; See also Fig. 3; The present invention increases to the design of 4 times of basic optical thickness through above-mentioned wall 222 with the first chamber Fabry-Perot cavity structure 22 and the 9th chamber Fabry-Perot cavity structure 22; Can reduce the stopband (stopband) of each passage effectively, and make each passage will can not interfere with other adjacent passage, and then promote the communication quality of fiber optic network technology.
What deserves to be mentioned is; Under the condition that does not make each passage wave mode distortion; Near the wall of the Fabry-Perot cavity structure of glass substrate and also can make 4～14 times of basic optical thickness into away from the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate according to environment or demand; And be the effect that reaches preferable, above-mentioned wall also can make 6 times of basic optical thickness, 8 times of basic optical thickness, 10 times of basic optical thickness, 12 times of basic optical thickness or 14 times of basic optical thickness on demand into.
Mandatory declaration be; The structural design of filtering apparatus of the present invention is not exceeded with structure level number or structural design that above-mentioned design formula is disclosed; So long as through increasing near the wall of the Fabry-Perot cavity structure of glass substrate and the purpose person who reaches the stopband of each passage of reduction away from the mode of the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate; Ought to belong to other feasible enforcement aspect of the present invention; And equivalent structure that all application instructions of the present invention and claim are done and method for making change, and ought to be included in the claim of the present invention.
Claims (10)
1. a filtering apparatus is characterized in that, includes:
Glass substrate; And
Filter coating is located on this glass substrate, have the Fabry-Perot cavity structure that plural chamber is formed by high refraction film layer and the mutual storehouse of low refraction rete, and above-mentioned high refraction film layer is λ with the basic optical thickness that hangs down the refraction rete
0/ 4, λ wherein
0Be the centre wavelength of incident light; These Fabry-Perot cavity structures are stacked on this glass substrate in regular turn, and respectively this Fabry-Perot cavity structure includes two-layer high reflection mirror rete and the wall of one deck between this two high reflection mirrors rete;
Wherein, In this filter coating near the wall of the Fabry-Perot cavity structure of glass substrate and be not less than 4 times of basic optical thickness away from the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate, and be not more than 14 times of basic optical thickness.
2. filtering apparatus as claimed in claim 1; It is characterized in that, in this filter coating near the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate be 4 times of basic optical thickness, 6 times of basic optical thickness, 8 times of basic optical thickness, 10 times of basic optical thickness, 12 times of basic optical thickness and 14 times of basic optical thickness wherein one.
3. filtering apparatus as claimed in claim 1; It is characterized in that, in this filter coating away from the optical thickness of the wall of the Fabry-Perot cavity structure of glass substrate be 4 times of basic optical thickness, 6 times of basic optical thickness, 8 times of basic optical thickness, 10 times of basic optical thickness, 12 times of basic optical thickness and 14 times of basic optical thickness wherein one.
4. filtering apparatus as claimed in claim 1 is characterized in that, the centre wavelength of described incident light is 1530 rice how.
5. filtering apparatus as claimed in claim 1 is characterized in that, the refractive index of described low refraction rete is 1.38 ~ 1.44.
6. filtering apparatus as claimed in claim 5 is characterized in that, described low refraction rete is processed with the monox material.
7. filtering apparatus as claimed in claim 1 is characterized in that, the refractive index of described high refraction film layer is 2.1 ~ 2.7.
8. filtering apparatus as claimed in claim 7 is characterized in that, described high refraction film layer is processed with the tantalum oxide material.
9. filtering apparatus as claimed in claim 1; It is characterized in that; This filter coating by nine chamber Fabry-Perot cavity structures in regular turn storehouse form; And the structure of this filter coating satisfies following design formula: H (LH) ^2 AL (HL) ^3 H (LH) ^3 4L (HL) ^3 H (LH) ^4 6L (HL) ^4 H (LH) ^3 6L (HL) ^3 H (LH) ^4 6L (HL) ^4 H (LH) ^3 6L (HL) ^3 H (LH) ^4 6L (HL) ^4 H (LH) ^3 4L (HL) ^3 H (LH) ^3 BL (HL) ^2 H/NS; Wherein, H representes that optical thickness is λ
0/ 4 high refraction film layer; L representes that optical thickness is λ
0/ 4 low refraction rete; NS is a glass substrate; 4 ≦ A ≦ 14; 4 ≦ B ≦ 14.
10. filtering apparatus as claimed in claim 9 is characterized in that, the A in this design formula be 4,6,8,10,12 and 14 wherein one; B in this design formula be 4,6,8,10,12 and 14 wherein one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101681459A CN102841396A (en) | 2011-06-21 | 2011-06-21 | Light filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101681459A CN102841396A (en) | 2011-06-21 | 2011-06-21 | Light filter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102841396A true CN102841396A (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101681459A Pending CN102841396A (en) | 2011-06-21 | 2011-06-21 | Light filter device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508654A (en) * | 2018-04-08 | 2018-09-07 | 青岛海信电器股份有限公司 | A kind of backlight module and liquid crystal display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5999322A (en) * | 1995-06-28 | 1999-12-07 | Cushing; David Henry | Multilayer thin film bandpass filter |
| US6018421A (en) * | 1995-06-28 | 2000-01-25 | Cushing; David Henry | Multilayer thin film bandpass filter |
| TWI245934B (en) * | 2004-07-21 | 2005-12-21 | Asia Optical Co Inc | CWDM filter with four channels |
| CN1721887A (en) * | 2004-07-16 | 2006-01-18 | 亚洲光学股份有限公司 | CWDM light filter |
| CN1734293A (en) * | 2004-08-10 | 2006-02-15 | 亚洲光学股份有限公司 | CWDM light filter with four channels |
| EP1659445A1 (en) * | 2003-06-13 | 2006-05-24 | Nippon Telegraph and Telephone Corporation | Variable wavelength optical filter |
-
2011
- 2011-06-21 CN CN2011101681459A patent/CN102841396A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5999322A (en) * | 1995-06-28 | 1999-12-07 | Cushing; David Henry | Multilayer thin film bandpass filter |
| US6018421A (en) * | 1995-06-28 | 2000-01-25 | Cushing; David Henry | Multilayer thin film bandpass filter |
| EP1659445A1 (en) * | 2003-06-13 | 2006-05-24 | Nippon Telegraph and Telephone Corporation | Variable wavelength optical filter |
| CN1721887A (en) * | 2004-07-16 | 2006-01-18 | 亚洲光学股份有限公司 | CWDM light filter |
| TWI245934B (en) * | 2004-07-21 | 2005-12-21 | Asia Optical Co Inc | CWDM filter with four channels |
| US20060018022A1 (en) * | 2004-07-21 | 2006-01-26 | Asia Optical Co., Inc. | CWDM filter with four channels |
| CN1734293A (en) * | 2004-08-10 | 2006-02-15 | 亚洲光学股份有限公司 | CWDM light filter with four channels |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508654A (en) * | 2018-04-08 | 2018-09-07 | 青岛海信电器股份有限公司 | A kind of backlight module and liquid crystal display device |
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Application publication date: 20121226 |