CN201732180U - Fiber-to-the-home single-fiber three-way multiplexer chip - Google Patents
Fiber-to-the-home single-fiber three-way multiplexer chip Download PDFInfo
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- CN201732180U CN201732180U CN2010202189566U CN201020218956U CN201732180U CN 201732180 U CN201732180 U CN 201732180U CN 2010202189566 U CN2010202189566 U CN 2010202189566U CN 201020218956 U CN201020218956 U CN 201020218956U CN 201732180 U CN201732180 U CN 201732180U
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Abstract
The utility model relates to a fiber-to-the-home single-fiber three-way multiplexer chip formed by an asymmetric Y branch waveguide and an multiple-mode interference (MMI) coupler which are cascaded; an air pocket is etched on the surface of the left branch of the asymmetric Y branch waveguide, and is arranged between a core layer and the underlay of the left branch; and the right branch of the asymmetric Y branch waveguide is a waveguide in a symmetric structure. The fiber-to-the-home single-fiber three-way multiplexer chip has compact device structure, can realize a plurality of types of optoelectronic integration, is applicable to mass production and has the advantage of low cost.
Description
Technical field
Technical field that the utility model relates to that Fiber to the home (FTTH) discloses that a kind of Fiber to the home with single-fiber three-way multiplexer chip (Triplexer).
Background technology
Along with developing rapidly of broadband access network in recent years, the broadband notable feature that becomes the Access Network development.Video request program, IPTV (Web TV) and the contour band width service of online game are considered as new business growth point by telecom operators and radio and TV operator gradually, the user constantly increases the demand of access band, and existing broadband access method based on ADSL (ADSL (Asymmetric Digital Subscriber Line)) has been difficult to satisfy the requirement of user to aspects such as high bandwidth, two-way transmission capabilities and securities.In the face of this predicament, the sight of paying close attention to has been invested that Fiber to the home by various countries telecom operators---FTTH (Fiber To The Home).The technical characterstic of FTTH is the bandwidth (bandwidth that 100Mbit/s is above that can provide bigger, be much better than present ADSL), strengthened the transparency of network, relaxed, thereby simplified installation and working service requirements such as environmental baseline and power supplies to data form, speed, wavelength and agreement.The FTTH practical application relates to a very important core devices, i.e. single-fiber three-way multiplexer chip, and the major function of single-fiber three-way multiplexer chip is to the coupling of light signal and wavelength-division multiplex.
In the technical manual of EPON and GPON, adopt 1310nm, 1490nm, 1550nm three-wavelength allocative decision.Wherein 1310nm is specifically designed to uploading of data and IP vision signal; 1490nm is used for the following biography of voice, data and IP vision signal; 1550nm is used for passing under the analog video signal.Mode by similar CWDM is multiplexed into this three directions transmission in the optical fiber, and this technology has adopted the point-to-multipoint transmission mode, saves equipment investment, and local side apparatus and optical fiber consumption significantly reduce, and system reliability is higher.The height of the cost final decision cost of access of single fiber three-way transmission plan.
There are a lot of method and structures can realize single-fiber three-way multiplexer, based thin film filter plate (thin film filter wherein, TFF) single-fiber three-way multiplexer has been realized commercialization, but the film filter plate has some inherent defects, as complex process, be not easy to encapsulation, coupling loss is big and shortcoming such as cost height.And utilize the single-fiber three-way multiplexer chip of integrated optics technique, and focus mostly at present in based on multi-mode interference-type coupling mechanism (MMI) with based on array waveguide grating (AWG) two big classes, it is low to have coupling loss, compact conformation and be easy to extensive integrated advantage.Wherein MMI has advantages such as polarization loss is low, the processing tolerance is big again, but owing to utilize traditional phenomenon of reflection certainly and wavelength-division multiplex principle design, the length of device is very big, and is compact inadequately.
With the immediate prior art of the utility model is to adopt single-fiber three-way multiplexer chip (the Mohamed H.Al-Gafy and Diaa Khalil of the Y branch beam splitter formation of two cascades, FTTHTriplexer Design Using Asymmetric Y-Junction With Etched Branch, IEEEPhotonics Technology Letters, vol.19, No.15, pp1157-1159,2007), yet in this structure, device size is big, the processing cost height, and the device isolation degree is less.
The utility model content
Big at the prior art device size, processing cost height, and the less deficiency of device isolation degree, the utility model provide a kind of novel single-fiber three-way multiplexer chip, have advantages such as compact conformation, cost is low, the insertion loss is low, the device isolation degree is big.
The purpose of this utility model is achieved through the following technical solutions:
Fiber to the home uses the single-fiber three-way multiplexer chip, form by asymmetric y branch waveguide and multi-mode interference-type coupling mechanism (MMI) cascade, it is characterized in that: the surface etch of the left branch of described asymmetric y branch waveguide has air groove, and described air groove is between the sandwich layer and substrate of left branch; The right branch of described asymmetric y branch waveguide is the symmetrical structure waveguide.
Further, the sandwich layer of the left branch of described asymmetric y branch waveguide is connected with first output waveguide, and described first output waveguide is a S type curved waveguide.The output terminal of first output waveguide is PORT1.
Further, the input waveguide of the described MMI of right branch cascade of described asymmetric y branch waveguide, described input waveguide is connected by the pyramidal structure waveguide with the multimode district waveguide of described MMI; Two output ports of described multimode district's waveguide are connected with second, third output waveguide respectively, and described output port is connected by the pyramidal structure waveguide with described output waveguide; Described output waveguide is a S shape curved waveguide; The width of multi-mode interference-type coupling mechanism is 8.4 μ m, and length is 4462.1 μ m.The output port of second output waveguide is PORT2, and the output port of the 3rd output waveguide is PORT3.
Further, the total length of described asymmetric y branch waveguide is 12000 μ m, and the angle between left branch and the right branch is 1.3mrad.
Further, described asymmetric y branch waveguide, input waveguide and output waveguide all adopt the buried glass based waveguides, and the sandwich layer refractive index of described glass-based waveguide is n
c=1.51, cladding index n
s=1.46.
Further, the height of described asymmetric y branch waveguide, input waveguide and output waveguide is 1.5 μ m; The width of the left branch of described asymmetric y branch waveguide is 2 μ m, and the width of right branch is 1.36 μ m, and the width of air groove equals 2 μ m.
Further, described Fiber to the home with the width of single-fiber three-way multiplexer chip is 39.88 μ m, and total length is 17562.1 μ m.
The utility model is realized asymmetric Y branched structure by the left branch surface etch air groove at y branch waveguide, makes to be separated from each other the dispersion curve slope difference of two branches with the light of realizing different wave length.And when making this asymmetric y branch waveguide, only need a mask plates to get final product, manufacturing process is simple, and is with low cost.
The left branch of asymmetric y branch waveguide adds S type waveguide output, can strengthen the distance between PORT1 and the PORT2, helps encapsulation.Two output terminals at MMI adopt the output of S type curved waveguide, not only can apace two-beam be separated, and effectively overcome the coupling between second, third output waveguide, have also strengthened the distance between PORT2 and the PORT3.
The utility model compared with the prior art, problems such as traditional discrete single-fiber three-way multiplexer volume is big, loss is big, isolation is little have been solved, has component compact, can realize that multiple photoelectricity is integrated, be fit to produce in enormous quantities, the advantage that cost is low is one of technical scheme of the following System-On-Chip of realization (SOC (system on a chip)).
Description of drawings
Fig. 1 is a structural drawing of the present utility model.
Fig. 2 a is the schematic cross-section of the left branch of non-Symmetric Y branch-waveguide.
Fig. 2 b is the schematic cross-section of the right branch of non-Symmetric Y branch-waveguide.
Fig. 3 is the dispersion curve figure of the asymmetric Y branched structure of the utility model single-fiber three-way multiplexer chip left and right sides branch-waveguide.
Fig. 4 a is that bundle Law of Communication (BPM) is analyzed the light field transmission diagram of 1310nm light by asymmetric y branch waveguide of the present utility model.
Fig. 4 b is that bundle Law of Communication (BPM) is analyzed the light field transmission diagram of 1490nm light by asymmetric y branch waveguide of the present utility model.
Fig. 4 c is that bundle Law of Communication (BPM) is analyzed the light field transmission diagram of 1550nm light by asymmetric y branch waveguide of the present utility model.
Fig. 5 a is that bundle Law of Communication (BPM) is analyzed the light field transmission diagram of 1490nm light by MMI of the present utility model.
Fig. 5 b is that bundle Law of Communication (BPM) is analyzed the light field transmission diagram of 1550nm light by MMI of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
Fiber to the home uses the single-fiber three-way multiplexer chip, form by asymmetric y branch waveguide 1 and multi-mode interference-type coupling mechanism 2 (MMI) cascade, 11 the surface etch of parting on the left side of described asymmetric y branch waveguide 1 has air groove 111, and described air groove 111 is between the sandwich layer 112 and substrate 113 of left branch 11; The right branch 12 of described asymmetric y branch waveguide 1 is the symmetrical structure waveguide.
The sandwich layer 112 of the left branch 11 of described asymmetric y branch waveguide 1 is connected with first output waveguide 3, and described first output waveguide 3 is a S type curved waveguide.The output terminal of first output waveguide is PORT1.
The input waveguide 4 of the described MMI of right branch 12 cascades of described asymmetric y branch waveguide 1, described input waveguide 4 is connected by pyramidal structure waveguide 5 with the multimode district waveguide of described MMI; Two output ports of described multimode district's waveguide are connected with second, third output waveguide 6,7 respectively, and described output port is connected by pyramidal structure waveguide 61,71 with described output waveguide 6,7; Described output waveguide 6,7 is a S shape curved waveguide; The width of multi-mode interference-type coupling mechanism 2 is 8.4 μ m, and length is 4462.1 μ m.The output port of second output waveguide 6 is PORT2, and the output port of the 3rd output waveguide 7 is PORT3.
The total length of described asymmetric y branch waveguide 1 is 12000 μ m, and the angle between left branch 11 and the right branch 12 is 1.3mrad.
Described asymmetric y branch waveguide 1, input waveguide 4 and output waveguide 3,6,7 all adopt the buried glass based waveguides, and the sandwich layer refractive index of described glass-based waveguide is n
c=1.51, cladding index n
s=1.46.
The height of described asymmetric y branch waveguide 1, input waveguide 4 and output waveguide 3,6,7 is 1.5 μ m; The width of the left branch 11 of described asymmetric y branch waveguide 1 is 2 μ m, and the width of right branch 12 is 1.36 μ m, and the width of air groove 111 equals 2 μ m.
Described Fiber to the home with the width of single-fiber three-way multiplexer chip is 39.88 μ m, and total length is 17562.1 μ m.
The utility model is realized asymmetric Y branched structure by the left branch surface etch air groove at y branch waveguide, makes to be separated from each other the dispersion curve slope difference of two branches with the light of realizing different wave length.And when making this asymmetric y branch waveguide, only need a mask plates to get final product, manufacturing process is simple, and is with low cost.
The left branch of asymmetric y branch waveguide adds S type waveguide output, can strengthen the distance between PORT1 and the PORT2, helps encapsulation.Two output terminals at MMI adopt the output of S type curved waveguide, not only can apace two-beam be separated, and effectively overcome the coupling between second, third output waveguide, have also strengthened the distance between PORT2 and the PORT3.
Enter in it after the input port PORT0 of the asymmetric y branch waveguide of input optical signal process is multiplexing, utilize the chromatic dispersion principle of asymmetric y branch waveguide that the 1310nm light wave is closed the left branch that the ripple signal is coupled into asymmetric y branch waveguide, finally by the straight-through output of port PO RT1.1490nm and 1550nm lightwave signal are coupled into the right branch of asymmetric y branch waveguide.
Enter the multiple-mode interfence district of MMI after multiplexing through the straight wave guide coupling regime by the light signal of the right branch of asymmetric y branch waveguide transmission, the self-imaging effect that utilizes the multi-mode interference-type coupling mechanism closes the ripple signal with 1490nm and 1550nm light wave respectively and is coupled into left arm and right arm, by PORT2 and PORT3 flashlight is exported respectively.Thereby reached the purpose of separating three wavelength.
Fig. 3 be asymmetric y branch waveguide about the two dispersion curve figure of branch.Dispersion curve is that effective refractive index concerns with wavelength change.Left branch is etched with air groove, the dispersion curve slope difference of the left and right sides branch that makes, and two curve intersections, its intersection point corresponding wavelength is 1.41 μ m.Wherein, the dispersion curve of left branch that is carved with air groove is precipitous relatively, and the dispersion curve of right branch is mild relatively.
As can be known from Fig. 3, for the light wave of λ＜1.41 μ m, the effective refractive index of left branch is higher relatively; For the light wave of λ＞1.41 μ m, the effective refractive index of right branch is higher relatively.According to the pattern separation principle of asymmetric Y bifurcation, under the enough little situation of branches angle, always along the big direction transmission of refractive index, the basic mode of input field is coupled in the big output waveguide of refractive index when propagating in waveguide owing to light wave.When the wavelength of light wave during less than 1.41 μ m, this optical signal transmission will be coupled into left branch during to the bifurcations place of asymmetric y branch waveguide; And when light wavelength during greater than 1.41 μ m, this light wave will be coupled into right branch.
Because we determined will the separated light signal wavelength be 1.31 μ m, 1.49 μ m, 1.55 μ m, then the light wave of 1.31 mum wavelengths is by the left branch output of asymmetric y branch waveguide, shown in Fig. 4 a; 1.49 the light of μ m and 1.55 mum wavelengths is by the right branch output of asymmetric y branch waveguide, shown in Fig. 4 b and Fig. 4 c.So just realized the separation of wavelength.
Shown in Fig. 4 a, wavelength is the light field transmission diagram of the light of 1310nm by asymmetric y branch waveguide, wherein solid line refers to that light passes through the output energy of Y branch left branch, and dotted line refers to that light passes through the output energy of Y branch right branch, as can be seen from the figure, the light of 1310nm reaches 89% by Y branch left branch output efficiency.
Shown in Fig. 4 b, wavelength is the light field transmission diagram of the light of 1490nm by asymmetric y branch waveguide, wherein solid line refers to that light passes through the output energy of Y branch left branch, and dotted line refers to that light passes through the output energy of Y branch right branch, as can be seen from the figure, the light of 1490nm reaches 97% by Y branch right branch output efficiency.
Shown in Fig. 4 c, wavelength is the light field transmission diagram of the light of 1550nm by asymmetric y branch waveguide, wherein solid line refers to that light passes through the output energy of Y branch left branch, and dotted line refers to that light passes through the output energy of Y branch right branch, as can be seen from the figure, the light of 1550nm reaches 97.4% by the right output efficiency of Y branch.
For the MMI structure, adopted restricted image-forming condition (restricted interference) to reduce the size of entire device.According to the self-imaging effect of MMI, MMI's is relevant with input wavelength from image space, also is the coupling length L of MMI
πBe that wavelength is relevant, utilize this characteristic, we can realize the multiplexing function of wavelength-division (separating).Length L when the multiple-mode interfence district of MMI
MmiWhen satisfying following formula and concerning, the signal of 1490nm and 1550nm will successfully be realized (separating) multiplexing function respectively from Port2 and Port3 output.
L
mmi＝n*L
π(1490)＝(n+m)*L
π(1550)
Wherein n is a positive integer, and m is an odd number, L
π(1490) and L
π(1550) be respectively the coupling length of MMI under 1490nm and the 1550nm.
Utilize finite difference method, can obtain the propagation constant of each rank pattern in multimode district, according to formula
(β
0And β
1Being respectively the zero degree mould in the multimode waveguide and the propagation constant of one-off pattern) bat that can obtain MMI is long.
Shown in Fig. 5 a, wavelength is the light field transmission diagram of the light of 1490nm by multi-mode interference-type coupling mechanism (MMI), wherein solid line refers to that light passes through the output energy of MMI left arm, and dotted line refers to that light passes through the output energy of MMI right arm, as can be seen from the figure, the light of 1490nm reaches 80% by the output efficiency of MMI left arm.
Shown in Fig. 5 b, wavelength is the light field transmission diagram of the light of 1550nm by MMI, and wherein solid line refers to that light passes through the output energy of MMI left arm, and dotted line refers to that light passes through the output energy of MMI right arm, as can be seen from the figure, the light of 1550nm reaches 80% by the output efficiency of MMI right arm.
Simulated spectral response result shows that the insertion loss of operation wavelength 1310nm, 1490nm and 1550nm is respectively 0.96dB, 1.49dB and 1.31dB.Isolation optimal value between 1310nm wavelength and 1490nm, the 1550nm is respectively 49.28dB and 48.08dB, the isolation optimal value is 37.23dB between 1490nm and the 1550nm, and during actual transmissions since the transmitted in both directions of upward signal and downgoing signal every degree can reach fully the ITU regulation greater than the 45dB requirement.
The described content of this instructions embodiment only is enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.
Claims (7)
1. Fiber to the home uses the single-fiber three-way multiplexer chip, form by asymmetric y branch waveguide and multi-mode interference-type coupling mechanism (MMI) cascade, it is characterized in that: the surface etch of the left branch of described asymmetric y branch waveguide has air groove, and described air groove is between the sandwich layer and substrate of left branch; The right branch of described asymmetric y branch waveguide is the symmetrical structure waveguide.
2. as claimed in claim 1 Fiber to the home uses the single-fiber three-way multiplexer chip, and it is characterized in that: the sandwich layer of the left branch of described asymmetric y branch waveguide is connected with first output waveguide, and described first output waveguide is a S type curved waveguide.
It is 3. as claimed in claim 2 that Fiber to the home uses the single-fiber three-way multiplexer chip, it is characterized in that: the input waveguide of the described MMI of right branch cascade of described asymmetric y branch waveguide, described input waveguide is connected by the pyramidal structure waveguide with the multimode district waveguide of described MMI; Two output ports of described multimode district's waveguide are connected with second, third output waveguide respectively, and described output port is connected by the pyramidal structure waveguide with described output waveguide; Described output waveguide is a S shape curved waveguide; The width of multimode waveguide coupling mechanism is 8.4 μ m, and length is 4462.1 μ m.
4. described Fiber to the home uses the single-fiber three-way multiplexer chip as one of claim 1-3, and it is characterized in that: the total length of described asymmetric y branch waveguide is 12000 μ m, and the angle between left branch and the right branch is 1.3mrad.
5. as claimed in claim 4 Fiber to the home uses the single-fiber three-way multiplexer chip, and it is characterized in that: described asymmetric y branch waveguide, input waveguide and output waveguide all adopt the buried glass based waveguides, and the sandwich layer refractive index of described glass-based waveguide is n
c=1.51, cladding index n
s=1.46.
6. as claimed in claim 5 Fiber to the home uses the single-fiber three-way multiplexer chip, and it is characterized in that: the height of described asymmetric y branch waveguide, input waveguide and output waveguide is 1.5 μ m; The width of the left branch of described asymmetric y branch waveguide is 2 μ m, and the width of right branch is 1.36 μ m, and the width of air groove equals 2 μ m.
7. as claimed in claim 6 Fiber to the home uses the single-fiber three-way multiplexer chip, it is characterized in that: described Fiber to the home with the width of single-fiber three-way multiplexer chip is 39.88 μ m, and total length is 17562.1 μ m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254351A (en) * | 2018-12-03 | 2019-01-22 | 浙江大学宁波理工学院 | A kind of path filter up and down based on single antisymmetry multimode period waveguide microcavity |
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2010
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254351A (en) * | 2018-12-03 | 2019-01-22 | 浙江大学宁波理工学院 | A kind of path filter up and down based on single antisymmetry multimode period waveguide microcavity |
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