CN101504474B - Comb-shaped ribbon filter - Google Patents
Comb-shaped ribbon filter Download PDFInfo
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- CN101504474B CN101504474B CN2009101112681A CN200910111268A CN101504474B CN 101504474 B CN101504474 B CN 101504474B CN 2009101112681 A CN2009101112681 A CN 2009101112681A CN 200910111268 A CN200910111268 A CN 200910111268A CN 101504474 B CN101504474 B CN 101504474B
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Abstract
The invention relates to the field of laser and optical fiber communication, in particular to a comb strip filter. The comb strip filter first adopts a dispersing component or a filter to spatially separate light of different lengths or bands, and then combines the light into beams after rearrangement and recombination according to requirements to form a plurality of channels to output the light. The comb strip filter adopts the same light path as a multi-wavelength selection switch or a wavelength selection switch (WSS), and changes a movable optical element into an optical element with a fixed position and a fixed state. For example, a liquid crystal in the WSS light path is replaced with a fixed wave plate, and an MEMS is replaced with a fixed reflective mirror. With the technical proposal, the comb strip filter has the advantages of simple and reasonable structure, and is a novel comb strip filter.
Description
Technical field
The present invention relates to laser and optical-fibre communications field, relate in particular to comb-shaped ribbon filter.
Background technology
The wavelength division multiplexer (Interleaver) that intersects is that comb filter is one of core devices of dwdm system, can be a string signal decomposition two groups of signal flows, or two groups of signal flows are combined into a string signal according to the principle of odd even distribution.In optical communication, be used for the separately wavelength of closeer distribution of uniform gap, the DWDM diaphragm of broader bandwidth can be separated or compound different wave length laser.The multi-wavelength selector switch also is one of core devices of DWDM, the arbitrary or arbitrary group of wavelength signals in the input optical fibre can be switched in arbitrary output optical fibre.
Shown in Figure 1 is common comb filter (Interleaver) synoptic diagram, the wavelength division multiplexer 2 that intersects is divided into two groups of uniformly-spaced mode optical channel outputs of odd even to the intensive ripple 1 of single group input, or two groups uniformly-spaced the input of mode optical channel is compound is one group of signal output with odd even.
Shown in Figure 2 is common WSS index path, and 201 is input optical fibre, and 202-1...202N is an output optical fibre, and 203 is catoptron, and 204 is diffraction optical fiber, and 205 is lens, and 206 is the single shaft catoptron.The wavelength-division multiplex signals of input optical fibre port is realized wavelength separated through grating, and focuses on the lens focal plane.The single shaft reflector group is placed in the focal plane, and the corresponding wavelength of each lens by adjusting mirror angle, to specific output optical fibre, is realized the wavelength selection with the corresponding wavelength signal reflex.
Summary of the invention
The present invention adopts another kind of novel simple optical texture, and concrete technical scheme is:
Comb-shaped ribbon filter of the present invention is to adopt dispersion element or optical filter that each wavelength light or each band of light are separated from the space, closes bundle by required after rearranging combination again, forms a plurality of passages outputs.Described comb-shaped ribbon filter adopts with multi-wavelength selector switch same optical path or with wavelength and selects interchanger (WSS) same optical path, the movable optical element in the light path is become the optical element of fixed position and state.As the liquid crystal in the WSS light path is replaced with fixedly wave plate; MEMS is replaced with stationary mirror.
Further, described optical routing collimating apparatus, the deflection converting unit, the chromatic dispersion grating, the array that 1/2 wave plate and non-wave plate optical element are combined into, Work-off crystal or PBS prism block, quarter wave plate and corner cube reflector constitute; Wherein deflection converting unit is made of work-off crystal and 1/2 wave plate, the incident light of random polarization can be converted to linearly polarized light, the chromatic dispersion grating separates incident light by wavelength, the array that 1/2 wave plate and non-wave plate optical element are combined into constitutes light beam and divides open walk, and pass through by Work-off crystal or PBS prism, the module that quarter wave plate and corner cube reflector constitute is selected light beam.
Further, behind described chromatic dispersion grating, increase the Dispersion Compensation Grating element, make the different wavelengths of light after the chromatic dispersion become the light that is parallel to each other.
Further, described corner cube reflector can be replaced by plane mirror.
Further, described PBS prism block can be by intersect the element replacement of plating high-reflecting film and anti-reflection film zone at glass.
The present invention adopts as above technical scheme, has simple and reasonable advantage, is a kind of comb-shaped ribbon filter of novelty.
Description of drawings
Fig. 1 is common comb-shaped ribbon filter (Interleaver) synoptic diagram;
Fig. 2 is that common wavelength is selected interchanger (WSS) index path;
Fig. 3 (a) is the structure vertical view of a 1X2 embodiment of the present invention;
Fig. 3 (b) is the side view of element 300 structures of the foregoing description;
Fig. 4 (a) is the structure vertical view of the second embodiment of the present invention;
Fig. 4 (b) is the structure side view of second embodiment shown in Fig. 4 (a);
Fig. 4 (c) is the plated film distribution plan of wave plate array;
Fig. 4 (d) is the expansion structure synoptic diagram of the second embodiment of the present invention;
Fig. 4 (e) is the plated film distribution plan of the glass sheet of the foregoing description;
Fig. 5 is the synoptic diagram of the third embodiment of the present invention.
Embodiment
The present invention is further described for existing accompanying drawings and embodiment.
The present invention adopts dispersion element or optical filter that each wavelength light or each band of light are separated from the space, again by required rearrange to close after the combination restraint into a plurality of passages outputs, thereby constitute the comb-shaped ribbon wavelength output device of required combination.
Fig. 3 (a) is depicted as a 1X2 structure vertical view of the present invention.Wherein 301 is collimator array, 302 are the deflection converting unit, constitute by work-off crystal and 1/2 wave plate, the work-off crystal is divided into two bundle polarized lights with incident beam: o light and e light, 1/2 wave plate places o light or e light light path, make its polarization direction half-twist, become the identical linearly polarized light in two bundle polarization directions, 303 are the chromatic dispersion grating, 304 is the array that 1/2 wave plate and non-wave plate optical element constitute, 305 is Work-off crystal or PBS prism, 306 is quarter wave plate, 307 is corner cube reflector or rhombic prism and corner cube reflector combination, the array 304 that 1/2 wave plate and non-wave plate optical element constitute, Work-off crystal or PBS prism 305, quarter wave plate 306 and corner cube reflector or rhombic prism are with corner cube reflector combination 307 composed components 300.
Be depicted as the structure side view of element 300 as Fig. 3 (b), array 304, Work-off crystal or PBS prism 305, quarter wave plate 306 and corner cube reflector that element 300 is made of 1/2 wave plate and non-wave plate optical element or rhombic prism and corner cube reflector combination 307 constitute.Utilize the branch beam function of 305 pairs of different polarization directions of PBS prism light beam, make the light beam transmission of certain polarization direction, and reflected by corner cube reflector 307 and return along original optical path; And the light beam of another polarization direction is reflected, and light path generation translation is selected by another PBS prism and corner cube reflector again, thereby separates each light beam.
This light path principle is: the random polarization light beam of incident is converted to linearly polarized light through polarization conversion unit 302, after 303 chromatic dispersions of chromatic dispersion grating, each wavelength light beam separates certain angle and enters 1/2 wave plate and each passage of the array 304 that non-wave plate optical element constitutes, when in the array 304 that 1/2 wave plate and non-wave plate optical element constitute when wave plate and the even transpostion interval of non-wave plate device, the polarization direction of adjacent two light beams of incident differs from one another, by Fig. 3 (b) structure choice, each light beam after the chromatic dispersion will be separated by parity channel, and this is common comb filter (Interleaver) structure.
By 1: 2,1: 3 or other required proportional spacing distributed, and then can obtain the band configuration of any permutation and combination as wave plate.
Be depicted as the vertical view of second kind of structure of the present invention as Fig. 4 (a), comprise collimator array 401, polarization conversion unit 402, polarization conversion unit 402 is made of work-off crystal and 1/2 wave plate, chromatic dispersion grating 403, Dispersion Compensation Grating 404, the array 405 that 1/2 wave plate and non-wave plate optical element are formed, work-off crystal or PBS prism 406, quarter wave plate 407, plane mirror 408.Employing Dispersion Compensation Grating 404 can make the different wavelengths of light after 403 chromatic dispersions of chromatic dispersion grating become the light that is parallel to each other, thereby can directly adopt plane mirror 408 each light beam of reflection.
Shown in Fig. 4 (b) is the side view of element 410 structures, element 410 is a 1X4 wavelength choice structure, by 1/2 wave plate 405, quarter wave plate 409A, 409B, the 409C of left end plating reflectance coating, PBS prism 406A, 406B, 406C and 406D, quarter wave plate 407A, 407B, 407C, 407D and plane mirror 408 constitute.S component polarized light can see through PBS prism 406A, and is reflected back into original optical path by plane mirror 408; P component polarized light will be entered PBS prism 406B by PBS prism 406A reflection, and be reflected once more and enter quarter wave plate 407A, reflected by plane mirror 408 equally again, come and go quarter wave plate 407A after, the polarization direction half-twist of light beam, transmission PBS prism 406B.After in like manner passing through quarter wave plate 409A twice, the light beam polarization direction will rotate once more, and enter the upper level light path, so can freely select certain channel to realize output.Arranging shown in Fig. 4 (c) of each channel wave chip arrays 409 wherein, dash area is illustrated in that the plating reflectance coating reflects incident beam on the quarter wave plate among the figure, and blank parts represents that light beam can directly pass through.Can make light beam from the output of the passage of any setting, or be reflected and move to other passage, thereby realize selection different passages.
Shown in Fig. 4 (d), directly adopt at intersection plating high-reflecting film 411 on glass and make the specific wavelength light transmission with anti-reflection film 412 methods, and all the other light reflections, in conjunction with corner cube reflector separately with each incident beam, wherein glass sheet A, glass sheet B, glass sheet C, glass sheet D synthesize the 1X4 structure, and the film plating process of each glass sheet is shown in Fig. 4 (e).Reflectance coating and anti-reflection film are spaced, and separate the width decision reflectance coating of wave band and the width of anti-reflection film according to the chromatic dispersion grating.
The present invention adopts the parity channel branch shown in Fig. 4 series to open the light, and then can constitute 1 * 4 comb filter (Interleaver), and this is equivalent to three common 1 * 2 comb filter (Interleaver) function, but this structural volume is much smaller.When adopting parity channel to divide the light time, and when adopting 1 * 8 structure, then be equivalent to 7 common comb filter (Interleaver) function.
Structure of the present invention both can make each wavelength separate by parity channel, also can separate not according to parity channel, and reconfigure by required Wavelength distribution.
Structure of the present invention can adopt existing WSS light path, only need its movable element such as MEMS, liquid crystal wave plate etc. change into stationary mirror or fixedly wave plate can become comb-shaped ribbon wavelength output device of the present invention.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present invention that do not break away from appended claims and limited; can make various variations to the present invention in the form and details, be protection scope of the present invention.
Claims (4)
1. comb-shaped ribbon filter, be to adopt dispersion element or optical filter that each wavelength light or each band of light are separated from the space, close bundle by required after rearranging combination again, form a plurality of passage outputs, realize selecting the interchanger same optical path with multi-wavelength selector switch same optical path or with wavelength, it is characterized in that: the optical element that the movable optical element in the light path is become fixed position and state, described optical routing collimating apparatus, the deflection converting unit, the chromatic dispersion grating, the array that 1/2 wave plate and non-wave plate optical element are combined into, Work-off crystal or PBS prism block, quarter wave plate and corner cube reflector constitute; Wherein deflection converting unit is made of work-off crystal and 1/2 wave plate, the incident light of random polarization can be converted to linearly polarized light, the chromatic dispersion grating separates incident light by wavelength, the array that 1/2 wave plate and non-wave plate optical element are combined into constitutes light beam and divides open walk, and pass through by Work-off crystal or PBS prism, the module that quarter wave plate and corner cube reflector constitute is selected light beam.
2. comb-shaped ribbon filter as claimed in claim 1 is characterized in that: increase the Dispersion Compensation Grating element behind described chromatic dispersion grating, make the different wavelengths of light after the chromatic dispersion become the light that is parallel to each other.
3. comb-shaped ribbon filter as claimed in claim 1 is characterized in that: described corner cube reflector can be replaced by plane mirror.
4. comb-shaped ribbon filter as claimed in claim 1 is characterized in that: described PBS prism block can be by intersect the element replacement of plating high-reflecting film and anti-reflection film zone at glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101112681A CN101504474B (en) | 2009-03-10 | 2009-03-10 | Comb-shaped ribbon filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101112681A CN101504474B (en) | 2009-03-10 | 2009-03-10 | Comb-shaped ribbon filter |
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| CN101504474A CN101504474A (en) | 2009-08-12 |
| CN101504474B true CN101504474B (en) | 2010-09-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102970073A (en) * | 2011-09-01 | 2013-03-13 | 昂纳信息技术（深圳）有限公司 | Device and system for optical performance monitoring |
| CN105182473B (en) * | 2015-09-18 | 2018-11-09 | 北京邮电大学 | A kind of wavelength selective optical disabler |
| CN108107513A (en) * | 2016-11-25 | 2018-06-01 | 福州高意通讯有限公司 | The light emitting devices of one kind 1 × 2WSS structures |
| EP3537121A1 (en) | 2018-03-09 | 2019-09-11 | Crystalline Mirror Solutions GmbH | Dual-comb generation from a single laser cavity via spectral subdivision |
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