CN204302529U - A kind of multichannel dense wavelength division multiplexing-demultiplexer - Google Patents
A kind of multichannel dense wavelength division multiplexing-demultiplexer Download PDFInfo
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Abstract
The utility model discloses a kind of multichannel dense wavelength division multiplexing-demultiplexer.Input waveguide is connected with the input of optical interleaver, two outputs are also connected with first, second planar waveguide respective respectively by first, second connection waveguide, a group pattern waveguide is connected with between first, second planar waveguide, in first output waveguide group, one end of every bar output waveguide is all connected on one end of the first planar waveguide, and the first output waveguide group is connected same one end that waveguide is connected to the first planar waveguide with first; In second output waveguide group on every one end of bar output waveguide and one end of the second planar waveguide, the second output waveguide group is connected same one end that waveguide is connected to the first planar waveguide with second.The utility model has that structure is simple, design is convenient and small size, high-performance, does not also introduce extra complicated technology, the basis that device size does not significantly increase achieves the double of port number.
Description
Technical field
The utility model relates to a kind of planar optical waveguide integrated device, especially relates to a kind of multichannel dense wavelength division multiplexing-demultiplexer.
Background technology
As everyone knows, light obtains immense success as carrier wave in long haul communication, and advances, as systems such as fiber to the home (FTTH), light network to short distance optic communication category.In these optical communication systems, in order to obtain larger volume of transmitted data, people have developed multiple multiplex technique, comprise wavelength-division multiplex, palarization multiplexing, time division multiplex etc.
Wherein, wavelength-division multiplex (WDM) technology obtains immense success in long-distance optical fiber communication, and its core devices is wavelength-division multiplex-demultiplexing device, and wherein most is representational is array waveguide grating.Traditional array waveguide grating is connected to form by input waveguide, input planar waveguide, Waveguide array, output planar waveguide and output waveguide successively, complex light is incident from input waveguide, enter planar waveguide and divergent transport, be then coupled to each Luciola substriata in waveguide array.There is certain optical path difference in adjacent array waveguide, thus produces different phasic differences to the light of each wavelength, realizes the dispersion function of grating.After exporting planar waveguide, the light of different wave length converges at the difference in array waveguide grating image planes, and then be coupled to the output waveguide of correspondence position, the light of different wave length can be exported from different output waveguide, achieve the separation of the light of different wave length, the function that Here it is Wave Decomposition is multiplexing.Conversely, just wavelength-division multiplex function can be realized.
Growing along with traffic capacity demands, dense wave division multipurpose becomes key technology.But the realization of dense wavelength division multiplexing device being not easy, mainly there is the deficiencies such as device size is large, performance is bad.In order to address this problem, conventional solution introduces a kind of so-called " optical interleaver ", and combine with two wavelength division multiplex devices mated.Optical interleaver is utilized to be first Δ λ by the channel spacing of incidence
cha series of wavelength be divided into two groups, i.e. odd number group, even number set.In odd number group, even number set, each channel wavelength is spaced apart 2 Δ λ
ch.Again odd number group, even number set are linked into each self-corresponding wavelength division multiplex device respectively, and then are separated.
In above-mentioned prior art, two wavelength division multiplex devices need be adopted, cause that module size is large, complex structure, and the centre wavelength of two wavelength division multiplex devices is often difficult to coupling due to preparation technology's error.Therefore, need multichannel dense wavelength division multiplexing-demultiplexer module that development is new badly, thus while acquisition superelevation communication data capacity, reduce this Multiplexing module complexity and cost thereof.
Summary of the invention
In order to solve Problems existing in background technology, the utility model object is to provide a kind of multichannel dense wavelength division multiplexing-demultiplexer module.
The technical solution adopted in the utility model is:
Comprise input waveguide, optical interleaver, first connects waveguide, second and connects waveguide, the first planar waveguide, the second planar waveguide, a group pattern waveguide, includes the first output waveguide group of N bar output waveguide, includes the second output waveguide group of N bar output waveguide; Input waveguide is connected with the input of optical interleaver, and two outputs of optical interleaver also connect through first the one end being connected to the first planar waveguide, the second planar waveguide after waveguide, second connects waveguide respectively; In first output waveguide group, one end of every bar output waveguide is all connected on one end of the first planar waveguide, and the first output waveguide group is connected same one end that waveguide is connected to the first planar waveguide with first; In second output waveguide group on every one end of bar output waveguide and one end of the second planar waveguide, the second output waveguide group is connected same one end that waveguide is connected to the first planar waveguide with second; A group pattern waveguide is connected with between the other end of the first planar waveguide and the second planar waveguide; Optical signal is from input waveguide input or from the first output waveguide group and the input of the second output waveguide group.
As Wave decomposing multiplexer, described input waveguide is input, and the first output waveguide group and the second output waveguide group are output; As wavelength division multiplexer, the first output waveguide group and the second output waveguide group are input, and described input waveguide is output.
As Wave decomposing multiplexer, the centre wavelength inciding input waveguide is λ by described optical interleaver
1, λ
2, λ
3, λ
4..., λ
n..., λ
2None group of optical signal to be divided into centre wavelength be λ
1, λ
3..., λ
2N-1odd number group optical signal and centre wavelength be λ
2, λ
4..., λ
2Ntwo passages of even number set optical signal; After odd number group optical signal connects waveguide, the first planar waveguide, Waveguide array, the second planar waveguide through first successively, from the second output waveguide group, the output of each output waveguide exports successively; After even number set optical signal connects waveguide, the second planar waveguide, Waveguide array, the first planar waveguide through second successively, from the first output waveguide group, the output of each output waveguide exports successively.
The wavelength interval of described odd number group optical signal is identical with the wavelength interval of even number set optical signal, is the twice of the wavelength interval of this group optical signal from input waveguide input.
Described optical interleaver is Mach-Zehnder interferometer.
Described optical interleaver is micro-ring wave filter.
Two waveguide length differences of described Waveguide array arbitrary neighborhood are identical.
The input position x of described first output waveguide group
o (I)determined by following formula:
N in formula
gfor Waveguide array effective index of fundamental mode, n
sbe the first planar waveguide/the second planar waveguide effective index of fundamental mode, d
gfor the adjacent array waveguide spacing of Waveguide array input, output, L
fPRbe the length of the first planar waveguide, the second planar waveguide, x
i (II)be the position of the second connection waveguide input waveguide output, m is order of interference, and λ is operation wavelength, λ=λ
2, λ
4..., λ
2N; Δ L is the length difference of adjacent waveguide in Waveguide array.
Input position xo (II) of described second output waveguide group is determined by following formula:
In formula, n
gfor Waveguide array effective index of fundamental mode, n
sbe the first planar waveguide/the second planar waveguide effective index of fundamental mode, d
gfor the adjacent array waveguide spacing of Waveguide array input, output, L
fPRbe the length of the first planar waveguide, the second planar waveguide, x
i (I)be the position of the first connection waveguide output, m is order of interference, and λ is operation wavelength, λ=λ
1, λ
3..., λ
2N-1; Δ L is the length difference of adjacent waveguide in Waveguide array.
The beneficial effect that the utility model has is:
The utility model has that structure is simple, design is convenient, does not also introduce extra complicated technology, and can realize port number and double, and device size does not significantly increase.
Accompanying drawing explanation
Fig. 1 is the structural representation of wavelength-division multiplex-demultiplexer of the present utility model.
Fig. 2 is the optical interleaver structural representation of Mach-Zehnder interferometer type.
Fig. 3 is that optical interleaver adopts single micro-ring-like enforcement illustration.
Fig. 4 is that optical interleaver adopts two micro-ring-like enforcement illustration.
Fig. 5 is the schematic diagram that embodiment of the present utility model makes device.
Fig. 6 is embodiment spectral response figure after tested.
In figure: 1 a, input waveguide, 2, optical interleaver, 3a, first connects waveguide, 3b, second connects waveguide, 4a, the first planar waveguide, 4b, the second planar waveguide, 5, a group pattern waveguide, 6a, the first output waveguide group, 6b, the second output waveguide group.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the utility model comprises input waveguide 1, optical interleaver 2, first connection waveguide 3a, second connects waveguide 3b, the first planar waveguide 4a, the second planar waveguide 4b, a group pattern waveguide 5, includes the first output waveguide group 6a of N bar output waveguide, includes the second output waveguide group 6b of N bar output waveguide; Input waveguide 1 is connected with the input of optical interleaver 2, and two outputs of optical interleaver 2 also connect through first the one end being connected to the first planar waveguide 4a, the second planar waveguide 4b after waveguide 3a, second connects waveguide 3b respectively; In first output waveguide group 6a, one end of every bar output waveguide is all connected on one end of the first planar waveguide 4a, and the first output waveguide group 6a is connected same one end that waveguide 3a is connected to the first planar waveguide 4a with first; In second output waveguide group 6b on one end of every bar output waveguide and one end of the second planar waveguide 4b, the second output waveguide group 6b is connected same one end that waveguide 3b is connected to the first planar waveguide 4a with second; A group pattern waveguide 5 is connected with between the other end of the first planar waveguide 4a and the second planar waveguide 4b; Optical signal inputs from input waveguide 1 or inputs from the first output waveguide group 6a and the second output waveguide group 6b.Input waveguide 1 of the present utility model, be reversible as the first output waveguide group 6a of output waveguide and the second output waveguide group 6b.
As Wave decomposing multiplexer, input waveguide 1 is input, and the first output waveguide group 6a and the second output waveguide group 6b is output; As wavelength division multiplexer, the first output waveguide group 6a and the second output waveguide group 6b is input, and input waveguide 1 is output.
During as Wave decomposing multiplexer, the centre wavelength inciding input waveguide 1 is λ by optical interleaver 2
1, λ
2, λ
3, λ
4..., λ
n..., λ
2None group of optical signal to be divided into centre wavelength be λ
1, λ
3..., λ
2N-1odd number group optical signal and centre wavelength be λ
2, λ
4..., λ
2Ntwo passages of even number set optical signal; After odd number group optical signal connects waveguide 3a, the first planar waveguide 4a, Waveguide array 5, second planar waveguide 4b through first successively, from the second output waveguide group 6b, the output of each output waveguide exports successively; After even number set optical signal connects waveguide 3b, the second planar waveguide 4b, Waveguide array 5, first planar waveguide 4a through second successively, from the first output waveguide group 6a, the output of each output waveguide exports successively.
The wavelength interval of above-mentioned odd number group optical signal is identical with the wavelength interval of even number set optical signal, and be the twice of the wavelength interval of this group optical signal inputted from input waveguide 1, that is: the centre wavelength inciding input waveguide 1 is λ
1, λ
2, λ
3, λ
4..., λ
n..., λ
2Nthe wavelength interval of one group of light be Δ λ
ch, then centre wavelength is λ
1, λ
3..., λ
2N-1the wavelength interval of odd number group optical signal be 2 Δ λ
ch, centre wavelength is λ
2, λ
4..., λ
2Nthe wavelength interval of even number set optical signal be 2 Δ λ
ch.
As shown in Figure 4, two waveguide length differences of Waveguide array 5 arbitrary neighborhood are identical, and length difference is constant Δ L.
Optical interleaver 2 is Mach-Zehnder interferometer or micro-ring wave filter.Mach-Zehnder interferometer as shown in Figure 2; Micro-ring wave filter as shown in Figure 3 and Figure 4, can be single micro-ring structure or its cascade structure, as two micro-ring structure of Fig. 4.
The input position x of the first output waveguide group 6a
o (I)determined by following formula 1:
In formula, n
gfor Waveguide array effective index of fundamental mode, n
sbe the first planar waveguide/the second planar waveguide effective index of fundamental mode, d
gfor the adjacent array waveguide spacing of Waveguide array input, output, L
fPRbe the length of the first planar waveguide, the second planar waveguide, x
i (II)be the position of the second connection waveguide 3b output, m is order of interference, and λ is operation wavelength, λ=λ
2, λ
4..., λ
2N; Δ L is the length difference of adjacent waveguide in Waveguide array 5.
The input position x of the second output waveguide group 6b
o (II)determined by following formula 2:
In formula, n
gfor Waveguide array effective index of fundamental mode, n
sbe the first planar waveguide/the second planar waveguide effective index of fundamental mode, d
gfor the adjacent array waveguide spacing of Waveguide array input, output, L
fPRbe the length of the first planar waveguide, the second planar waveguide, x
i (I)be the position of the first connection waveguide 3a output, m is order of interference, and λ is operation wavelength, λ=λ
1, λ
3..., λ
2N-1; Δ L is the length difference of adjacent waveguide in Waveguide array 5.
The utility model is as follows as the course of work of demultiplexer:
Centre wavelength is λ
1, λ
2, λ
3, λ
4..., λ
n..., λ
2None group of optical signal incide the input waveguide 1 of optical interleaver 2.It is λ that optical interleaver 2 is divided into centre wavelength
1, λ
3..., λ
2N-1odd number group optical signal and centre wavelength be λ
2, λ
4..., λ
2Neven number set optical signal, enter into the first connection waveguide 3a, second respectively and connect waveguide 3b;
Enter into the odd number group optical signal λ of the first connection waveguide 3a
1, λ
3..., λ
2N-1continue to spread into the first planar waveguide 4a and divergent transport, be then coupled to Waveguide array 5, after Waveguide array 5, enter into the second planar waveguide 4b.Due to the dispersion of Waveguide array, the light of different wave length focuses on the diverse location of the second planar waveguide 4b end, and wavelength is λ
2n-1optical signal to the n-th output waveguide in the second output waveguide group 6b.
Enter into the even number set optical signal λ of the second connection waveguide 3b
2, λ
4..., λ
2Ncontinue to spread into the second planar waveguide 4b and divergent transport, be then coupled to Waveguide array 5, after Waveguide array 5, enter into the first planar waveguide 4a.Due to the dispersion of Waveguide array, the light of different wave length focuses on the diverse location of the first planar waveguide 4a end, and wavelength is λ
2noptical signal to the n-th output waveguide in the first output waveguide group 6a.
As can be seen here, from the centre wavelength of same input waveguide incidence be λ
1, λ
2, λ
3, λ
4..., λ
n..., λ
2Neach passage of one group of light last to export from the N bar output waveguide of the N bar output waveguide of the second output waveguide group 6b, the first output waveguide group 6a respectively.
According to reversibility of optical path, the utility model is also used as multiplexer, and its course of work is contrary with the process as demultiplexing, specific as follows:
Centre wavelength is λ
1, λ
3..., λ
2N-1the optical signal of N number of passage and centre wavelength be λ
2, λ
4..., λ
2Nthe optical signal of N number of passage to incide in the first output waveguide group 6a in N Luciola substriata and the second output waveguide group 6b in N Luciola substriata respectively one by one.
The centre wavelength entering into the first output waveguide group 6a N Luciola substriata is λ
1, λ
3..., λ
2N-1optical signal continue to spread into the first planar waveguide 4a and divergent transport separately, be then coupled to Waveguide array 5 separately, after Waveguide array 5, enter into the second planar waveguide 4b separately.Due to the dispersion of Waveguide array, centre wavelength is λ
1, λ
3..., λ
2N-1optical signal be all coupled to the first connection waveguide 3a;
The centre wavelength entering into the second output waveguide group 6b N Luciola substriata is λ
2, λ
4..., λ
2Noptical signal continue to spread into the second planar waveguide 4b and divergent transport separately, be then coupled to Waveguide array 5 separately, after Waveguide array 5, enter into the first planar waveguide 4a separately.Due to the dispersion of Waveguide array, centre wavelength is λ
2, λ
4..., λ
2Noptical signal be all coupled to the second connection waveguide 3b; First connect that the one group of optical signal transmitted in waveguide 3a is connected with second that waveguide 3b transmits another organize optical signal and incide optical interleaver 2 respectively, and all to export from the input waveguide 1 be connected with optical interleaver 2.
The specific embodiment of a kind of multichannel dense wavelength division multiplexing-demultiplexer of the present utility model is as follows:
At this, select silicon nanowires fiber waveguide based on silicon-on-insulator (SOI) material as input waveguide and output waveguide: its sandwich layer is silicon materials, and thickness is 220nm, refractive index is 3.4744; Its under-clad layer material is SiO
2, thickness is 2 μm, refractive index is 1.4404; Its covering is air, and refractive index is 1.0.
The relevant parameter of the array waveguide grating adopted is: N=9, channel spacing Δ λ
ch=1.6nm, Waveguide array and output waveguide width are 460nm, Waveguide array effective index of fundamental mode n
g=2.377341617, first planar waveguide and the second planar waveguide effective index of fundamental mode are n
s=2.847688, the adjacent array waveguide spacing d of Waveguide array input, output
g=1.6 μm, the length L of the first planar waveguide, the second planar waveguide
fPR=100 μm, order of interference m=20, the length difference Δ L=13.088 μm of adjacent waveguide in Waveguide array 5.
The position x of the first connection waveguide 3a output
i (I)=-11.09 μm, the position x of the second connection waveguide 3b output
i (II)=-9.86 μm, the input position of the first output waveguide group 6a is followed successively by x
o (I)=-7.40 ,-4.93 ,-2.47,0.00,2.47,4.93,7.40,9.86,12.33 μm, the input position of the second output waveguide group 6b is followed successively by x
o (II)=-7.40 ,-4.93 ,-2.47,0.00,2.47,4.93,7.40,9.86,12.33 μm.
For Mach-Zehnder interferometer type optical interleaver as shown in Figure 2, two-arm length difference is set to 172.81 μm, the free spectral range of the output spectrum of its output is 3.2nm, thus of incidence group light can be divided into odd number group and even number set that channel spacing is 3.2nm.
As shown in Figure 5, often organize output waveguide has 9 to the wavelength-division multiplex finally made-demultiplexing device, has 18 output channels.As shown in Figure 5, small-sized due to Mach-Zehnder interferometer, the total device size after therefore increasing significantly does not increase, and total number of channels adds one times.
Fig. 6 is its test spectral response, and have 18 passages, channel spacing is 1.6nm, 9 passages of original single planar waveguide is increased to 18 passages, achieves the double of port number, have significant technique effect.
The Mach-Zehnder interferometer of embodiment also can be replaced the micro-annular type optical interleaver of list as shown in Figure 3, micro-ring length is 172.81 μm, two output is straight-through end and downloading end, its free spectral range is 3.2nm, of incidence group light can be divided into odd number group and even number set that channel spacing is 3.2nm.
Above-described embodiment is used for explaining and the utility model is described; instead of the utility model is limited; in the protection domain of spirit of the present utility model and claim, any amendment make the utility model and change, all fall into protection domain of the present utility model.
Claims (9)
1. multichannel dense wavelength division multiplexing-demultiplexer, is characterized in that: comprise input waveguide (1), optical interleaver (2), first connects waveguide (3a), second and connects waveguide (3b), the first planar waveguide (4a), the second planar waveguide (4b), a group pattern waveguide (5), includes the first output waveguide group (6a) of N bar output waveguide, includes the second output waveguide group (6b) of N bar output waveguide;
Input waveguide (1) is connected with the input of optical interleaver (2), and two outputs of optical interleaver (2) also connect through first the one end being connected to the first planar waveguide (4a), the second planar waveguide (4b) after waveguide (3a), second connects waveguide (3b) respectively; In first output waveguide group (6a), one end of every bar output waveguide is all connected on one end of the first planar waveguide (4a), and the first output waveguide group (6a) is connected same one end that waveguide (3a) is connected to the first planar waveguide (4a) with first; In second output waveguide group (6b) on every one end of bar output waveguide and one end of the second planar waveguide (4b), the second output waveguide group (6b) is connected same one end that waveguide (3b) is connected to the first planar waveguide (4a) with second; A group pattern waveguide (5) is connected with between the other end of the first planar waveguide (4a) and the second planar waveguide (4b); Optical signal is from input waveguide (1) input or from the first output waveguide group (6a) and the input of the second output waveguide group (6b).
2. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, it is characterized in that: as Wave decomposing multiplexer, described input waveguide (1) is input, and the first output waveguide group (6a) and the second output waveguide group (6b) are output; As wavelength division multiplexer, the first output waveguide group (6a) and the second output waveguide group (6b) are input, and described input waveguide (1) is output.
3. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: as Wave decomposing multiplexer, and the centre wavelength inciding input waveguide (1) is λ by described optical interleaver (2)
1, λ
2, λ
3, λ
4..., λ
n..., λ
2None group of optical signal to be divided into centre wavelength be λ
1, λ
3..., λ
2N-1odd number group optical signal and centre wavelength be λ
2, λ
4..., λ
2Ntwo passages of even number set optical signal; After odd number group optical signal connects waveguide (3a), the first planar waveguide (4a), Waveguide array (5), the second planar waveguide (4b) through first successively, from the second output waveguide group (6b), the output of each output waveguide exports successively; After even number set optical signal connects waveguide (3b), the second planar waveguide (4b), Waveguide array (5), the first planar waveguide (4a) through second successively, from the first output waveguide group (6a), the output of each output waveguide exports successively.
4. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 3, it is characterized in that: the wavelength interval of described odd number group optical signal is identical with the wavelength interval of even number set optical signal, be the twice of the wavelength interval of this group optical signal inputted from input waveguide (1).
5. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: described optical interleaver (2) is Mach-Zehnder interferometer.
6. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: described optical interleaver (2) is micro-ring wave filter.
7. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: two waveguide length differences of described Waveguide array (5) arbitrary neighborhood are identical.
8. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: the input position x of described first output waveguide group (6a)
o (I)determined by following formula:
N in formula
gfor Waveguide array effective index of fundamental mode, n
sbe the first planar waveguide/the second planar waveguide effective index of fundamental mode, d
gfor the adjacent array waveguide spacing of Waveguide array input, output, L
fPRbe the length of the first planar waveguide, the second planar waveguide, x
i (II)be the position of the second connection waveguide (3b) input waveguide output, m is order of interference, and λ represents the operation wavelength inciding input waveguide (1) optical signal even number set; Δ L is the length difference of adjacent waveguide in Waveguide array (5).
9. a kind of multichannel dense wavelength division multiplexing-demultiplexer according to claim 1, is characterized in that: the input position x of described second output waveguide group (6b)
o (II)determined by following formula:
In formula, n
gfor Waveguide array effective index of fundamental mode, n
sbe the first planar waveguide/the second planar waveguide effective index of fundamental mode, d
gfor the adjacent array waveguide spacing of Waveguide array input, output, L
fPRbe the length of the first planar waveguide, the second planar waveguide, x
i (I)be the position of the first connection waveguide (3a) output, m is order of interference, and λ represents the operation wavelength inciding input waveguide (1) optical signal odd number group; Δ L is the length difference of adjacent waveguide in Waveguide array (5).
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