CN101308233A - 1 x N multi-module light power dispenser - Google Patents
1 x N multi-module light power dispenser Download PDFInfo
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- CN101308233A CN101308233A CNA2008100628570A CN200810062857A CN101308233A CN 101308233 A CN101308233 A CN 101308233A CN A2008100628570 A CNA2008100628570 A CN A2008100628570A CN 200810062857 A CN200810062857 A CN 200810062857A CN 101308233 A CN101308233 A CN 101308233A
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Abstract
The invention discloses a 1xN multimode optical power splitter. A mode-disturbing area is formed by an input straight waveguide, and a light-splitting area is formed by N output straight waveguides or N output S-shaped waveguides. The N output straight waveguides are distributed symmetrically along the center line of the input straight waveguide, each output straight waveguide and the center line of the input straight waveguide have an angle theta which becomes larger sequentially from the middle to both sides, and the angle theta is between 0 and 25 degrees. The N output S-shaped waveguides are distributed symmetrically along the center line of the input straight waveguide, the distance L from each output S-shaped waveguide to the centre line of the input straight waveguide becomes larger sequentially from the middle to both sides, and the distance L is between 0 and 2.2mm. The mode-disturbing area has the function of making input optical signals reach the equilibrium mode distribution, and the light-splitting area has the function of distributing the optical signals reaching equilibrium mode distribution to each output terminal to output. The optical power splitter overcomes the problem of mode noise of the multimode optical power splitter, and has the advantages of compact structure, low insertion loss, good light-splitting evenness, loose assembly tolerance and insensitiveness to wavelength.
Description
Technical field
The present invention relates to optical communication field, particularly relate to a kind of 1 * N multimode luminous-power distributor.
Background technology
Luminous-power distributor is at optical communication system, passive photonic loop, optical fiber cable TV (Cable Television, CATV), EPON (Passive Optical Network, PON), optical local area network etc. is widely used in the field, usually is used for realizing that light path connects, the control of optical signal transmission direction, optical signal power distribute, the Coupling Control between each device etc.
So-called multimode luminous-power distributor is meant that input waveguide and output waveguide all are the luminous-power distributors of multimode waveguide.The cross-sectional dimension of multimode waveguide is bigger, can be from tens microns to the hundreds of micron.Compare with the single-mode optics power divider, the multimode luminous-power distributor has relaxed coupling condition, allows bigger horizontal and angle rigging error.Yet, can encourage hundreds and thousands of optical transmission modes in the multimode waveguide, because the coupling condition difference, the zero energy that each mould carries is also different; In the transmission course, because modular transformation, mode coupling and mode attenuation, the energy proportion that each mould carries also constantly changes, and has only through after the very long transmission range, and the ratio that each mould carries energy just is fixed up, and this state is exactly that the stable state mould distributes.Modal noise has influenced the performance of multimode luminous-power distributor.
Patent related to the present invention mainly contains: CN1124505C, CN1305236C, US4229067.Patent CN1305236C adopts planar waveguide-type Y branch stage to link the luminous-power distributor of structure, but should design work as output port more for a long time for improving the homogeneity of exporting energy, and device length is longer, and loss is bigger; Patent CN1124505C adopts beam splitter and extender, can not increase device length because of output port is more or increase loss, but the input end build-up tolerance is less; Patent US4229067 uses step-gradient-step waveguide mode scrambler to solve the modal noise problem, but its waveguide length is oversize, and loss is too big.
Summary of the invention
In order to overcome the problem of multimode luminous-power distributor modal noise, the object of the present invention is to provide a kind of 1 * N multimode luminous-power distributor, its characteristic is not subjected to the influence of modal noise substantially.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention is by disturbing the mould district and the beam split district is formed by connecting; Disturb the mould district and be made of an input straight wave guide, the beam split district is made of N root output waveguide.
Described N root output waveguide is a straight wave guide output, and N root straight wave guide output is symmetrically distributed along the center line of input straight wave guide, and every straight wave guide output increases from the centre to both sides successively with the angle theta of the center line of input straight wave guide, and the θ angle is 0～25 °.
Described N root output waveguide is the waveguide of output S shape, and the waveguide of N root output S shape is symmetrically distributed along the center line of input straight wave guide, and the waveguide of every output S shape increases from the centre to both sides successively with the distance L of the center line of input straight wave guide, and L is 0～2.2mm.
Described straight wave guide output or the waveguide of output S shape, its width is 50～200 microns, and thickness is 50～200 microns, and length is 1～10 millimeter.
Described input straight wave guide of disturbing the mould district, its width are N times of output waveguide width, and thickness is identical with the thickness of output waveguide, and length is 1～10 millimeter.
Described N root output waveguide is the natural number greater than 1.
The principle of work of 1 * N multimode luminous-power distributor is: from the light signal of multimode optical fiber, from disturbing the input of mould district left end, through repeatedly total reflection, finally reach the stable state mould and distribute disturbing mould district right-hand member in the transmission course, overcome the problem of modal noise; The beam split district with disturb mould district right-hand member and link to each other, will reach the light signal that the stable state mould distributes and be assigned to each output terminal and output.
The main performance index of luminous-power distributor has loss, added losses, the homogeneity of insertion, crosstalks and Polarization Dependent Loss, and wherein inserting loss and homogeneity is most important performance index.
Insert loss and be defined as the reduction of the luminous power of appointed output terminal mouth with respect to the luminous power of input port, mathematic(al) representation is
In the formula, IL
iBe the insertion loss of i output port, P
OUTiBe the luminous power of i output port, P
INIt is the luminous power of input port.
Homogeneity is defined as the maximum variable quantity of each output port luminous power, and mathematic(al) representation is
The beneficial effect that the present invention has is:
The present invention is not subjected to the influence of modal noise, have compact conformation, insert that loss is low, beam split good uniformity, build-up tolerance are loose, to characteristics such as wavelength are insensitive.
Description of drawings
Fig. 1 is first kind of structural representation of the present invention.
Fig. 2 is second kind of structural representation of the present invention.
Fig. 3 is second kind of structure assembling of the present invention synoptic diagram.
Fig. 4 is that the embodiment of the invention is disturbed the insertion loss in mould district and the graph of a relation of homogeneity and length.
Fig. 5 is the straight wave guide output synoptic diagram in beam split of the present invention district.
Fig. 6 is the output S shape waveguide synoptic diagram in beam split of the present invention district.
Among the figure: 1, input straight wave guide, 2, straight wave guide output, 3, input optical fibre, 4, output optical fibre, 21, the waveguide of output S shape.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
The present invention is by disturbing the mould district and the beam split district is formed by connecting; Disturb the mould district and be made of an input straight wave guide 1, the beam split district is made of N root output waveguide.
As shown in Figure 1, described N root output waveguide is a straight wave guide output 2, N root straight wave guide output 2 is symmetrically distributed along the center line of input straight wave guides 1, and every straight wave guide output 2 increases from the centre to both sides successively with the angle theta of the center line of input straight wave guide 1, and the θ angle is 0～25 °.
As shown in Figure 2, described N root output waveguide is output S shape waveguide 21, N root output S shape waveguide 21 center lines along input straight wave guide 1 are symmetrically distributed, and the waveguide 21 of every output S shape increases from the centre to both sides successively with the distance L of the center line of input straight wave guide 1, and L is 0～2.2mm.
Described straight wave guide output 2 or output S shape waveguide 21, its width is 50～200 microns, and thickness is 50～200 microns, and length is 1～10 millimeter.
Described input straight wave guide 1 of disturbing the mould district, its width are N times of output waveguide width, and thickness is identical with the thickness of output waveguide, and length is 1～10 millimeter.
Described N root output waveguide is the natural number greater than 1.
The mould district of disturbing of 1 * 4 multimode luminous-power distributor is made of an input straight wave guide 1.Width is 200 μ m, and thickness is 50 μ m, and refractive index is 1.56.Adopt Ray-tracing Method to analyze to inserting loss and homogeneity, they with the relation of disturbing the mould section length as shown in Figure 4.In Fig. 4, top curve is for inserting damage curve, and following curve is the homogeneity curve, and two dotted lines of 7.3dB and 0.5dB are respectively insertion loss and the inhomogeneity upper limit requirement of FTTH system to 1 * 4 luminous-power distributor.When disturbing the mould section length when being 4mm, to insert loss and be about 6.35dB, homogeneity is about 0.23dB, and keeps stable, meets design requirement, and therefore getting the length of disturbing the mould district is 4mm.
The beam split district of 1 * 4 multimode luminous-power distributor is made of 4 output waveguides.The width of output waveguide and thickness are 50 μ m, and projected length is 5mm.For first kind of structure, when promptly output waveguide was straight wave guide output 2,4 straight wave guide outputs 2 were symmetrical distribution, the center line of every straight wave guide output 2 and input straight wave guide 1 θ that forms an angle, as shown in Figure 5.(Finite-Difference BPM FD-BPM) analyzes, and the insertion loss that make straight wave guide output 2 is less than 0.05dB, and θ should be no more than 25 ° to adopt finite difference beam propagation method.For second kind of structure, when promptly output waveguide was for the waveguide 21 of output S shape, 4 output S shapes waveguide 21 was symmetrical distribution, and the output terminal of each output S shape waveguide 21 respectively becomes certain distance L with the center line of input straight wave guide 1, as shown in Figure 6.Adopt FD-BPM to analyze, the insertion loss that make output S shape waveguide 21 is less than 0.05dB, and L should be no more than 2.2mm.
To disturb the mould district according to actual needs and the beam split district combines, and can constitute 1 * 4 complete multimode luminous-power distributor, it possesses following characteristic: (1) compact conformation, and total length has only 9mm; (2) the insertion loss is low, is about 6.35dB; (3) the beam split good uniformity is about 0.23dB; (4) build-up tolerance is loose, and wherein, the horizontal build-up tolerance of input end is ± 0.06mm, and vertically build-up tolerance is 0.04mm, and the angle build-up tolerance is ± 1 °; (5) insensitive to wavelength.
Use soft lithography that 1 * 4 multimode luminous-power distributor is made.At first, adopt single line engraving and the mode that the zone engraving combines, prepare mother matrix with computing machine numerical controlled carving technology.Then, carry out seal by mother matrix and turn over system, signet material is silicone elastomer (PDMS).At last, adopt mold (REM) method again, utilize seal to carry out the device transfer printing, device material is an acrylate, adopts ultra-violet curing, obtains required device.Whole process can be finished in a few hours.Technology is simple, save time and with low cost, is the huge advantage of soft lithography.
The assembling of second kind of structure and multimode optical fiber, as shown in Figure 3.Input optical fibre 3 is touched district's centered alignment with disturbing, and light signal is from disturbing the input straight wave guide 1 left end input in mould district, and the output S shape waveguide 21 right-hand members output from the beam split district enters output optical fibre 4, and its build-up tolerance is loose, does not need strict fine registration.
The specific embodiment of the present invention is a lot, is embodiment at this with 1 * 4 multimode luminous-power distributor, but only limits to this embodiment by no means.
Claims (6)
1. 1 * N multimode luminous-power distributor is characterized in that: by disturbing the mould district and the beam split district is formed by connecting; Disturb the mould district and be made of an input straight wave guide, the beam split district is made of N root output waveguide.
2. a kind of 1 * N multimode luminous-power distributor according to claim 1, it is characterized in that: described N root output waveguide is a straight wave guide output, N root straight wave guide output is symmetrically distributed along the center line of input straight wave guide, every straight wave guide output increases from the centre to both sides successively with the angle theta of the center line of input straight wave guide, and the θ angle is 0～25 °.
3. a kind of 1 * N multimode luminous-power distributor according to claim 1, it is characterized in that: described N root output waveguide is the waveguide of output S shape, the waveguide of N root output S shape is symmetrically distributed along the center line of input straight wave guide, the waveguide of every output S shape increases from the centre to both sides successively with the distance L of the center line of input straight wave guide, and L is 0～2.2mm.
4. a kind of 1 * N multimode luminous-power distributor according to claim 1 and 2 is characterized in that: described straight wave guide output or the waveguide of output S shape, and its width is 50～200 microns, and thickness is 50～200 microns, and length is 1～10 millimeter.
5. a kind of 1 * N multimode luminous-power distributor according to claim 1 is characterized in that: described input straight wave guide of disturbing the mould district, its width are N times of output waveguide width, and thickness is identical with the thickness of output waveguide, and length is 1～10 millimeter.
6. a kind of 1 * N multimode luminous-power distributor according to claim 1 is characterized in that: described N root output waveguide is the natural number greater than 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100628570A CN101308233A (en) | 2008-06-30 | 2008-06-30 | 1 x N multi-module light power dispenser |
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| CNA2008100628570A CN101308233A (en) | 2008-06-30 | 2008-06-30 | 1 x N multi-module light power dispenser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467518A (en) * | 2015-12-29 | 2016-04-06 | 北京大学 | Star coupler for adjustment of light power division ratio and realization method for same |
| JP2017151275A (en) * | 2016-02-25 | 2017-08-31 | 住友ベークライト株式会社 | Optical waveguide, photo-electric hybrid board, optical module and electronic apparatus |
| CN113555658A (en) * | 2021-07-16 | 2021-10-26 | 宁波大学 | Compact 1 XN MMI type optical power distributor |
| US20220244464A1 (en) * | 2021-02-02 | 2022-08-04 | Macom Technology Solutions Holdings, Inc. | Multimode splitter for narrowing input width photodetector connections |
-
2008
- 2008-06-30 CN CNA2008100628570A patent/CN101308233A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467518A (en) * | 2015-12-29 | 2016-04-06 | 北京大学 | Star coupler for adjustment of light power division ratio and realization method for same |
| CN105467518B (en) * | 2015-12-29 | 2019-05-21 | 北京大学 | A kind of tunable optical function divides the star coupler and its implementation of ratio |
| JP2017151275A (en) * | 2016-02-25 | 2017-08-31 | 住友ベークライト株式会社 | Optical waveguide, photo-electric hybrid board, optical module and electronic apparatus |
| US20220244464A1 (en) * | 2021-02-02 | 2022-08-04 | Macom Technology Solutions Holdings, Inc. | Multimode splitter for narrowing input width photodetector connections |
| CN113555658A (en) * | 2021-07-16 | 2021-10-26 | 宁波大学 | Compact 1 XN MMI type optical power distributor |
| CN113555658B (en) * | 2021-07-16 | 2023-03-21 | 宁波大学 | Compact 1 XN MMI type optical power distributor |
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Open date: 20081119 |