CN208351042U - The uniform AWG router of frequency spectrum is realized in a kind of filter and input channel cascade - Google Patents
The uniform AWG router of frequency spectrum is realized in a kind of filter and input channel cascade Download PDFInfo
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Abstract
The utility model discloses a kind of filters and input channel cascade to realize the uniform AWG router of frequency spectrum.Free Spectral Range is greater than 2 × N times of channel wavelength interval of array waveguide grating, and array waveguide grating has 2N-1 I/O channel, and array waveguide grating central input port is connected through AWG input waveguide with filtering input waveguide；By n-th of input port and the N+n input port at one group of input port in other input ports, and the output end of same filter is connected to through AWG input waveguide respectively, N-1 filter input end is connected with remaining N-1 filtering input waveguide respectively.The utility model realizes that output spectrum insertion loss damages uniform arrayed-waveguide grating routers and can effectively reduce the insertion loss difference of all output channels, it effectively reduces Free Spectral Range requirement and diffraction time is serious output wavelength frequency departure caused by both integers not can be implemented simultaneously, have many advantages, such as that production is simple, at low cost.
Description
Technical field
The utility model relates to a kind of array waveguide grating (AWG) light wavelength routers, and in particular to a kind of filter and
The uniform AWG router of frequency spectrum is realized in input channel cascade.
Background technique
As the minimum feature size of semiconductor technology persistently reduces according to Moore's Law, chip integration is higher and higher,
Data exchange speed between each transistor will be unable to keep up with the data processing speed of itself, the electrical interconnection based on metal conduction
Technology is faced with impassable " electronic bottleneck ".Compared with electrical interconnection, light network (Optical Interconnect) is with light
Son is information carrier, has the advantages such as ultra high bandwidth, ultrafast transmission rate, electromagnetism interference and low energy consumption, will cause a new round
Information industry revolution.
Silicon-based optical interconnection technology have many advantages, such as it is low in energy consumption, compatible with semiconductor CMOS process, can integrate, is at low cost, be
Realize the ideal platform between piece with on-chip optical interconnection.The intelligence point of optical node uplink/downlink wavelength may be implemented in light wavelength router
Match, the routing exchange of the clog-free area of light of high speed guarantees transparent transmission, is one of core devices of light interconnection network system.
Light wavelength router can use toroidal resonator (Ring resonator), the modes such as etched diffraction grating (EDG)
It realizes.But when considering that more wavelength channel and production require, array waveguide grating (AWG) is the optimal selection of light wavelength router
One of.AWG have it is compact-sized, be easily integrated, many merits such as function admirable and reliability height.By N × N-type Waveguide array light
The light wavelength router that grid (AWG) are constituted just becomes research hotspot.
For common array waveguide grating light wavelength router, central wavelength is by grating equation ncΔ L=m λc(formula
1) it determines, wherein ncIt is the effective refractive index of Waveguide array, Δ L is length difference of the adjacent array waveguide in Waveguide array area, m
It is diffraction time, λcIt is central wavelength.Its Free Spectral Range is expressed asWherein, Nc
It is the group index of Waveguide array.In the optical wavelength routing application of N × N, it is desirable that the FSR of AWG is exactly the N of channel spacing
Times, and diffraction time m must be integer.General two equatioies can not meet simultaneously.Array wave can only be acquired by formula (2)
Length difference is led to be rounded nearby in the diffraction time m that substitution formula (1) obtains.So according to integer m, the anti-FSR pushed back is just and real again
Border require there are deviations, cause more serious frequency departure phenomenon.Simultaneously in this case, in addition to central passage with
Outside, the output spectrum of remaining input channel needs to use the frequency spectrum that diffraction time is m-1 or m+1, since energy is mainly distributed
In m diffraction time, the Energy distribution of different diffraction times has bigger difference, and then light wavelength router faces one certainly
It is difficult by the non-uniform realization of channel insertion loss in spectral region.It is embodied in, for an input channel, owns
The insertion loss difference of output channel frequency spectrum has at least 3dB, and for output spectrum corresponding for all input channels, loss
Difference is at least 6dB.
The method for the defeated differential loss of reduction array waveguide grating light wavelength router reported both at home and abroad at present mainly has
Waveguide array and output waveguide zone junction use pattern converter wavefront modes matching process and Waveguide array it
Between add assistant waveguide method.Sakamaki Y,Kamei S,Hashimoto T,et al. Loss Uniformity
Improvement of Arrayed-Waveguide Grating With Mode-Field Converters Designed
by Wavefront Matching Method[J].Journal of Lightwave Technology,2009,27(24):
The wavefront mould in Waveguide array and output waveguide zone junction use pattern converter is mentioned in this article of 5710-5715
Formula matching process.Basic mode in Waveguide array is converted to the boundary between output plate area and output waveguide by the mode converter
With the far field field distribution of flat-top effect on face.This method makes the loss of output spectrum corresponding for an input channel
For, differential loss falls below 0.7dB by 2.4dB.Sheng Z,Dai D,He S.Improve Channel
Uniformity of an Si-Nanowire AWG Demultiplexer by Using Dual-Tapered
Auxiliary Waveguides[J].Journal of Lightwave Technology,2007,25(10):3001-3007
It is mentioned in this article in Waveguide array and output planar waveguide junction, adds assistant waveguide between Waveguide array to realize
Array waveguide grating wavelength demultiplexer frequency spectrum homogenization.The design is so that the frequency spectrum differential loss of 12 output channels is less than
0.5dB。
Both methods all successfully reduces array waveguide grating light wavelength router output spectrum differential loss.But all
For the corresponding output spectrum of an input channel, and for all input channels, due to utilize other
Diffraction time still suffers from the differential loss of 3dB.
Utility model content
For the deficiency of background technique, the purpose of this utility model is that proposing that a kind of filter and input channel cascade are real
The existing uniform AWG router of frequency spectrum, filter and input channel are added in connection on the basis of array waveguide grating (AWG), with solution
The certainly larger problem of traditional array waveguide optical grating light wavelength router spectrum insertion differential loss realizes that frequency spectrum loss is uniform.
Light wavelength router is one of the core devices in the systems such as light network, optic communication, it is desirable that has all outputs logical
The wavelength Routing loops function in road.Existing normal utilization has N × N array waveguide optical grating of N number of input channel and N number of output channel
May be implemented optical wavelength routing, the Free Spectral Range of this design requirement array waveguide grating be equal to output channel number with it is defeated
The product of channel spacing out, optical grating diffraction level are m.But in this case, in addition to central passage, other input channels
Corresponding output spectrum requires to use the diffraction time of m-1 or m+1.Such that the array waveguide grating road of N × N
The insertion loss difference of all output channels as corresponding to the central passage of device is at least 3dB, for all input channels,
The frequency spectrum difference of all output channels is at least 6dB.
In order to reduce this differential loss, realize that the loss in all channels is uniform, different from traditional array waveguide grating
The design of light wavelength router, the utility model design the Waveguide array light that a kind of free spectral range is greater than N number of channel width
Grid, according to the corresponding relationship of input and output, using before specific two input waveguides plus cascading Mach Zeng Deer interferometer
(MZI) or the method for other filters, input light is divided into two bundles and is separately input in corresponding input channel, is only spread out using m
Level is penetrated, is realized in addition to the input channel of center, output spectrum corresponding to other input channels also can be realized frequency spectrum loss
Uniform purpose.This utility model is suitable for the various waveguides based on silica, silicon, silicon nitride, silicon oxynitride, indium phosphide etc.
Material and waveguiding structure.
The purpose of this utility model is achieved through the following technical solutions:
The utility model includes N item filtering input waveguide, N-1 filter, 2N-1 AWG input waveguide, Waveguide array
Grating and N output waveguide；Free Spectral Range is greater than 2 × N times of channel wavelength interval in array waveguide grating, array wave
Guide grating has 2N-1 I/O channel, and the central input port (i.e. n-th input port) of array waveguide grating is through one
AWG input waveguide and the 1st filtering input waveguide connection；For its in array waveguide grating other than central input port
N-th of input port and the N+n input port are formed one group of input port by his input port, and respectively through respective AWG
Input waveguide is connected to the output end of same filter, and total N-1 group input port is connected to N-1 filter, N-1 filtering
The input terminal of device is connected with remaining N-1 filtering input waveguide respectively.
The filter is 1 × 2 filter, and input light is carried out light-splitting processing.
N number of light positioned at intermediate wavelength is input to N item filtering input waveguide and then enters battle array in diffraction time wave-length coverage
In train wave guide grating, the light inputted from remaining the N-1 filtering input waveguide in addition to the 1st filters input waveguide is through respective
Filter is split the two-beam different for wavelength, then respectively enters two input channels of array waveguide grating, then
It is exported after array waveguide grating Wavelength routing from output waveguide, that is, passes sequentially through the input planar waveguide of array waveguide grating
Area, Waveguide array area and output waveguide zone propagate to N output waveguide.
Thus the wavelength that is located in the middle N number of in diffraction time wave-length coverage is only input to Waveguide array light by the utility model
In grid, so that output spectrum corresponding to all input channels of array waveguide grating realizes that uniform purpose is lost in frequency spectrum, i.e.,
Realize output corresponding to other input channels in addition to the center input channel of all input channels of array waveguide grating
Frequency spectrum also can be realized frequency spectrum and uniform purpose be lost.
The array waveguide grating (AWG) mainly by from be input to output be sequentially arranged input waveguide zone, battle array
Arrange waveguide section and output waveguide zone constitute, Waveguide array area be located at input waveguide zone and output waveguide zone it
Between.
In the utility model, the array waveguide grating of corresponding N number of I/O channel, N number of channel wavelength interval is less than institute
The entire Free Spectral Range of array waveguide grating optical wavelength, i.e. FSR > N Δ λ are stated, wherein FSR is array waveguide grating optical wavelength
The Free Spectral Range of router, Δ λ are the channel separation of array waveguide grating light wavelength router.
The utility model uses 1 × 2 filter and its two by the way that the non-central input port in array waveguide grating is special
A AWG input waveguide 3 is cascaded as basic unit, so that Free Spectral Range is greater than the Waveguide array at N times of channel wavelength interval
Grating realizes the Wavelength routing effect of N × N.
Other input ports other than array waveguide grating central input port use 1 × 2 filter and two AWG
Input waveguide cascade is inputted, so that after being originally inputted light and being input to array waveguide grating corresponding channel, a certain subwave
When the corresponding output spectrum of long light is unsatisfactory for AWG Wavelength routing condition, according to inside array waveguide grating wavelength and input
It is corresponding logical to be passed through array waveguide grating by the Wavelength routing relationship between output channel for the light for being originally inputted the part wavelength in light
Another input channel other than road, and then realize to be originally inputted light and be input to all output spectrums of array waveguide grating and be all satisfied
Array waveguide grating Wavelength routing condition, to realize the effect of Wavelength routing.
The filter can also be can reach equally using cascading Mach Zeng Deer interferometer structure using remaining
The filter of spectrophotometric result.
In the utility model, the array waveguide grating of 2N channel width, diffraction time are greater than using Free Spectral Range
For m, which has 2N-1 input channel, and n-th input channel is center channel, N number of output channel, defeated
Add N-1 cascading Mach Zeng Deer interferometer or other 1 × 2 filters before entering waveguide.
When what table 1 indicated is that light beam is divided into two through wave filter, two input waveguides being connected and corresponding wavelength
Range of distribution.First is classified as the input channel of the branch connection of filter, another branch that third is classified as filter connects
The input channel connect, secondary series and the 4th column are respectively distribution wavelength corresponding to the Liang Ge branch of filter.Such as N+1
Input light is divided into λ by the filter of input waveguide connection2~λNWith 1 liang of beam of λ, λ2~λNLight enter the N+1 articles input waveguide, λ1
Light enter the 1st article of input waveguide.Because the Free Spectral Range of array waveguide grating is greater than 2N channel spacing, by this
Processing, the output spectrum of all input channels is all in m diffraction time, the problem of being not in the central wavelength deviation of frequency spectrum, and
And under the same diffraction time, the differential loss of each output channel is also smaller, therefore it is uniform that frequency spectrum loss may be implemented
Effect.
The connection relationship and Wavelength Assignment relationship of 1. filter of table and input channel
The utility model has the beneficial effect that
1. one kind disclosed in the utility model is in addition to the input channel of center, defeated using 1 × 2 filter and specific two
Enter waveguide cascade structure to realize that output spectrum insertion loss damages uniform arrayed-waveguide grating routers and can effectively reduce institute
There is the insertion loss difference of output channel.
2. one kind disclosed in the utility model is in addition to the input channel of center, using filter and specific two incoming waves
Cascade structure is led to realize that output spectrum insertion loss damages uniform arrayed-waveguide grating routers, free light can be effectively reduced
Spectral limit requires and diffraction time is serious output wavelength frequency departure caused by both integers not can be implemented simultaneously.
3. one kind disclosed in the utility model is in addition to the input channel of center, using filter and specific two incoming waves
Cascade structure is led to realize that output spectrum insertion loss damages uniform arrayed-waveguide grating routers, can be applied to different materials
The array waveguide grating light wavelength router of material, different waveguide structure has many advantages, such as that production is simple, at low cost.
Detailed description of the invention
Fig. 1 is the Wavelength routing schematic diagram of array waveguide grating light wavelength router.
Fig. 2 is the structural schematic diagram of traditional array waveguide optical grating light wavelength router.
Fig. 3 is the Wavelength routing schematic diagram of the array waveguide grating light wavelength router of the utility model.
Fig. 4 is the structural schematic diagram of cascading Mach Zeng Deer interferometer filter.
Fig. 5 is the structural schematic diagram of the array waveguide grating light wavelength router of the utility model.
Fig. 6 is the filtered spectrogram of cascading Mach Zeng Deer interferometer filter.
Fig. 7 is the output spectrum figure of 4 × 4 traditional array waveguide optical grating light wavelength router.
Fig. 8 is logical using the input channel 3 of the array waveguide grating light wavelength router of the 4*4 of the utility model and input
The output spectrum figure in road 7.
Fig. 9 is the output frequency using the input channel 4 of the array waveguide grating light wavelength router of the 4*4 of the utility model
Spectrogram.
Figure 10 is the input channel 5 and input using the array waveguide grating light wavelength router of the 4*4 of the utility model
The output spectrum figure in channel 2.
Figure 11 is the input channel 6 and input using the array waveguide grating light wavelength router of the 4*4 of the utility model
The output spectrum figure in channel 1.
In figure: filtering input waveguide 01, filter 02, AWG input waveguide 03, array waveguide grating 04, N output wave
Lead 05.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
The Wavelength routing schematic diagram of as shown in Fig. 14 × 4 array waveguide grating light wavelength router.Center input
Channel is input channel 2.
The wavelength of the array waveguide grating light wavelength router are as follows: work as wavelength X1,λ2,λ3,λ4Light from input
When channel 1 inputs, the wavelength of the output light of output channel 1 to output channel 4 is followed successively by λ '4,λ1,λ2,λ3；Work as wavelength X1,λ2,
λ3,λ4Light from input channel 2 input when, the wavelength of the output light of output channel 1 to output channel 4 is followed successively by λ1,λ2,λ3,λ4；
Work as wavelength X1,λ2,λ3,λ4Light from input channel 3 input when, output channel 1 to output channel 4 output light wavelength successively
For λ2,λ3,λ4,λ”1；Work as wavelength X1,λ2,λ3,λ4Light from input channel 4 input when, output channel 1 arrive output channel 4 output
The wavelength of light is followed successively by λ3,λ4,λ”1,λ”2.λ ' indicates output wavelength when diffraction time is m-1, and λ " indicates that diffraction time is m
Output wavelength when+1.
When array waveguide grating is used for optical wavelength routing function, since adjacent three Free Spectral Ranges are not quite similar,
The output wavelength of edge gateway biggish frequency can occur due to the output wavelength in other channels not under the same diffraction time
Rate deviation.Such as λ "2≠λ2, particularly with the array waveguide grating light wavelength router of silicon nanowires, due to the big material color of silicon
It dissipates, this problem is especially serious.Moreover, because capacity volume variance caused by diffraction time is different, so that the damage of each output channel
Consumption differs greatly.
To realize wavelength, the Free Spectral Range of array waveguide grating light wavelength router is input/output
The product of port number and channel wavelength spacing indicates are as follows:
FSR=N × Δ λ
Wherein, N is the input/output port number of array waveguide grating light wavelength router, and Δ λ is array waveguide grating light
The channel wavelength spacing of lambda router.
As shown in Fig. 2, traditional array waveguide optical grating light wavelength router include N input waveguide, input waveguide zone,
Waveguide array area, output waveguide zone and N output waveguide；
The central wavelength of traditional array waveguide optical grating light wavelength router meets following diffraction equation:
ncΔ L=m λc
Wherein, λcFor center wavelength, m is diffraction time.
The Free Spectral Range of traditional array waveguide optical grating light wavelength router can be indicated by following equation:
Wherein, NcIt is the group index of Waveguide array.
In the optical wavelength routing application of N × N, it is desirable that the Free Spectral Range of array waveguide grating is exactly channel separation
N times, i.e., need to meet formula (1): FSR=N × Δ λ.Determine that the input/output of traditional array waveguide optical grating light wavelength router is logical
After road number N and channel separation Δ λ, the Free Spectral Range FSR of traditional array waveguide optical grating light wavelength router is also determined that.
Due to the central wavelength lambda of traditional array waveguide optical grating light wavelength routercIt has determined, so passing through formula
It (3) can be in the hope of the length difference Δ L of adjacent two waveguide in traditional array waveguide optical grating light wavelength router Waveguide array area.Then again
Δ L is substituted into formula (2), the diffraction time m of available traditional array waveguide optical grating light wavelength router, because m is necessary for whole
Number, so Free Spectral Range is not able to satisfy formula (1) generally, in this way other than central passage, remaining input channel it is defeated
Frequency spectrum needs to use the frequency spectrum that diffraction time is m-1 or m+1 out, will cause more serious frequency departure phenomenon.
As shown in figure 3, the utility model AWG router topology includes N item filtering input waveguide 01, N-1 filter
02,2N-1 AWG input waveguide 03, array waveguide grating 04 and N output waveguide 05；Free Spectral Range is greater than Waveguide array
2N times of channel wavelength interval in grating 04, array waveguide grating 04 have 2N-1 I/O channel, array waveguide grating
04 central input port (i.e. n-th input port) is through an AWG input waveguide 03 and the 1st filtering input waveguide 01 connection；
For other input ports in array waveguide grating other than central input port, by n-th of input port and N+n
Input port forms one group of input port, and is connected to the output of same filter 02 through respective AWG input waveguide 03 respectively
End, total N-1 group input port are connected to N-1 filter 02, and the input terminal of N-1 filter 02 is a with remaining N-1 respectively
Input waveguide 01 is filtered to connect.
N number of light positioned at intermediate wavelength is input to N item filtering input waveguide 01 and then enters in diffraction time wave-length coverage
In array waveguide grating 02, from the light of remaining the N-1 filtering input of input waveguide 01 in addition to the 1st filters input waveguide 01
It is split the two-beam different for wavelength through respective filter, then respectively enters two inputs of array waveguide grating 04
Then channel exports after 04 Wavelength routing of array waveguide grating from output waveguide 05.
Array waveguide grating AWG is mainly by from being input to output the input waveguide zone, the Waveguide array area that are sequentially arranged
It is constituted with output waveguide zone, Waveguide array area is located between input waveguide zone and output waveguide zone.
Other input ports other than 02 central input port of array waveguide grating use 1 × 2 filter and two
The cascade of AWG input waveguide 03 is inputted, so that after being originally inputted light and being input to 02 corresponding channel of array waveguide grating, it is a certain
When the corresponding output spectrum of the light of part wavelength is unsatisfactory for AWG Wavelength routing condition, according to the wave inside array waveguide grating 02
Wavelength routing relationship between long and I/O channel, is passed through Waveguide array light for the light for being originally inputted the part wavelength in light
Another input channel other than 02 corresponding channel of grid, and then realize that being originally inputted light is input to all defeated of array waveguide grating 02
Frequency spectrum is all satisfied 02 Wavelength routing condition of array waveguide grating out, to realize the effect of Wavelength routing.
Filter 02 is 1 × 2 filter, and input light is carried out light-splitting processing.In specific implementation, filter is using grade
Join Mach-Zehnder interferometers structure, the filter of same spectrophotometric result can also be can reach using remaining.
The working principle of the utility model is as follows:
Fig. 3 is the Wavelength routing schematic diagram of the array waveguide grating light wavelength router of the utility model.Channel spacing is
△ λ, FSR > 8 × △ λ of array waveguide grating light wavelength router in figure.Input channel centered on input port 4.λ2For in
Cardiac wave is long.According to as shown in the figure, first it is numbered to input port and output port.3~input port of input port 6 and output
3~output port of port 6 is corresponding relationship.According to the principle of array waveguide grating, obtain for λ1,λ2,λ3,λ4This four waves
For length, the corresponding relationship of input port and output port.
The corresponding relationship of table 2. input port and output port
As shown in table 2, for input port 4, then when there is λ1,λ2,λ3,λ4Light input when, the light of four wavelength point
It is not exported from output port 3,4,5,6.
And work as λ1,λ2,λ3,λ4Light from input port 5 input when, light can be defeated from 2~output port of output port 5 respectively
Out, in order to achieve the purpose that 6 output light of output port is wavelength 1, it can be found that λ 1 can be inputted from input port 6 from table,
It is exported from output port 1, according to symmetry, λ 1 can be inputted from input port 1, be exported from output port 6.Then, pass through one
Input light is divided into two bundles by a filter, wave-length coverage λ2,λ3,λ4Light continue to input from input port 5, and λ1Light from
Input port 1 inputs, it will be exported from output port 6.
Similarly, when wavelength is λ1,λ2,λ3,λ4Light when being inputted from input port 6, can be defeated from output port 1,2,3,4
Out, in order to which the light for guaranteeing that output port 5 and output port 6 export is λ 1, input light is divided into λ by λ 21,λ2And λ3,λ4Two beams, λ1,
λ2It is inputted from input port 2, according to data in table it is found that λ1,λ2It can be exported respectively from output port 5 and output port 6, and
λ3,λ4It inputs from input port 6, is exported from output port 3 and output port 4.
Similarly, input light is divided into λ1,λ2,λ3And λ4Two beams are inputted from input port 3 and input port 7, equally respectively
It can be exported from 1~output port of output port 4.
For the traditional array waveguide optical grating light wavelength router that Free Spectral Range is N number of channel spacing, this
The structure design of utility model reduces the differential loss of output spectrum at two aspects: first is that because Free Spectral Range is greater than
The product of number of active lanes and channel spacing, therefore avoid for all output spectrums corresponding to the same input channel, damage
The problem of consumption difference is at least 3dB；Second is that being avoided since the output spectrum of all input channels is all in m diffraction time
The problem of center input channel and edge input channel differential loss are at least 3dB.
The Free Spectral Range of the array waveguide grating of the utility model router topology design is bigger, so in
For 4 wavelength of the heart, loss uniformity is relatively good, differential loss very little, and can by the cascade of input channel and filter
To achieve the purpose that output spectrum recycles.
About the design of filter, as shown in figure 4, specific implementation can use the knot of cascading Mach Zeng Deer interferometer
Structure, cascading Mach Zeng Deer interferometer can be used as 1 × 2 or 2 × 2 trellis filters.
By designing the coefficient of coup of directional coupler and the arm length difference of Mach-Zehnder interferometers at different levels, can achieve
Two output channel difference output spectrums are the light of approximate rectangular different wavelength range.With the increase of cascade level, output
Spectral shape can become closer to rectangle, thus can be in the case where not increasing crosstalk and loss, by input light according to wavelength
The difference of range is divided into two parts.
Fig. 5 is the structural schematic diagram of the array waveguide grating light wavelength router of the utility model.It can be with from structure chart
It was found that waveguide has intersection when filter is connect with array waveguide grating input waveguide, about the design of crossing waveguide structure,
There are many correlative studys to solve this problem.About the design of array waveguide grating, as shown in Fig. 2, using traditional
Saddle-shaped configuration is designed.
The embodiments of the present invention are as follows:
One embodiment of the utility model is given below, and the utility model is described in further detail.Assuming that following parameter can
Know: selecting SOI, wherein Si core layer thickness is 220nm, buries under-clad layer SiO2With a thickness of 1 μm, top covering SiO2Thickness
It is 2 μm.The width of sandwich layer silicon waveguide is 500nm, which has a relatively good production tolerance.
Embodiment: 4 × 4 AWGR that design channel separation is 20nm, central wavelength lambdacFor 1550nm, the free light of design
Spectral limit is 80nm.Fig. 2 is structural schematic diagram, and table 3 is relevant design parameter.
The design parameter of the AWGR of table 3. 4 × 4
Under this traditional design, the corresponding output spectrum figure of available four input channels shown in fig. 6, (a),
(c), (b), the output spectrum figure of input channel 1-4 (d) is respectively indicated.Input port 2 is center input channel.And to spectrogram
Carry out data analysis, available table 4 and table 5, i.e., each input channel output spectrum central wavelength corresponding with output channel
With insertion loss size.It is 85.5nm by the Free Spectral Range that m diffraction time can be obtained in formula (3) because m approximation is rounded, and
It is not 4*20=80nm, therefore, it can be seen that when using other diffraction times, it may appear that bigger frequency difference, it is logical to input
For road 4, output 3 and 4 output spectrums of output are m+1 diffraction time, the inclined 1510-1506.02=of central wavelength difference
3.98nm and
1530-1528.07=1.93nm and the frequency spectrum differential loss in all channels is 8.03-3.70=4.33dB.
The central wavelength of the output spectrum of the AWGR of table 4. 4 × 4
The insertion loss of the output spectrum of the AWGR of table 5. 4 × 4
Next, the different cascading Mach Zeng Deer interferometer of designed central wavelength, Fig. 4 is knot according to the utility model
Structure schematic diagram, using the cascading Mach Zeng Deer interferometer of 4 ranks, the coefficient of coup of directional coupler is respectively 0.5,
0.13,0.12,0.5,0.25, arm length differences at different levels are respectively L1=L0, L2=2*L0, L3=2*L0+0.5* λ0/ n, L4=2*
L0, L0 are available by formula (6), according to the difference of filter range, using different central wavelength, so L0 is different, Fig. 7
For the frequency spectrum of two output channels of filter under different central wavelengths, wave-length coverage is divided into 1510nm and 1530-1570nm by (a)
Two sections, input channel 1 and input channel 5 are corresponded to, (b) is divided to wave-length coverage to 1510nm-1530nm and two sections of 1550-1570nm,
Input channel 2 and input channel 6 are respectively corresponded, (c) is divided to wave-length coverage to 1510nm-1550nm and two sections of 1570nm, it is right respectively
Answer input channel 3 and input channel 7.
Next, the AWG for the 7*4 that design channel separation is 20nm, and cascading filter in front, Fig. 5 are specific knot
Structure schematic diagram, central wavelength lambdacFor 1550nm, diffraction time m=3, Free Spectral Range 313nm.Table 6 is parameter designing.
The design parameter of the AWG of 6. the utility model of table
| Central wavelength (nm) | 1550 |
| Input channel number | 7 |
| Output channel number | 4 |
| Waveguide array number | 35 |
| Diffraction time | 3 |
| Plate section length (um) | 25 |
| Input waveguide/output waveguide spacing (um) | 1.8 |
| Waveguide array spacing (um) | 1.8 |
| Waveguide array length difference (um) | 6.96 |
Available Fig. 8, Fig. 9, the corresponding output spectrum figure of four input channels shown in Figure 10, Figure 11, in Fig. 8
(a) (b) is respectively the output spectrum of input channel 3 and 7, λ1, λ2, λ3It is inputted from input channel 3, and from output channel 4,5,6
Output, λ4It inputs, is exported from output channel 3, therefore from the available output spectrum of output channel 3-6, similarly from input channel 7
(a) (b) in Figure 10 is respectively the output spectrum of input channel 5 and 2, and (a) (b) in Figure 11 is respectively input channel 6 and 1
Output spectrum.Fig. 9 is the output spectrum of input channel 4, because center input channel 4 does not need cascading Mach Zeng Deer interference
Instrument directly can export λ in output channel 3-61, λ2, λ3, λ4Frequency spectrum.
Input channel 4 is center input channel.And data analysis, available table 6 and table 7 are carried out to spectrogram, i.e., respectively
A input channel output spectrum central wavelength corresponding with output channel and insertion loss size.Because Free Spectral Range compared with
Greatly, only use diffraction time be m output spectrum, frequency difference is smaller, maximum frequency difference be 0.58nm and channel spacing 20nm for,
It can ignore.And the frequency spectrum differential loss in all channels is 4.54-3.83=0.71dB, is the spectral difference of above-mentioned traditional design
The approximation 1/6th of different 4.33dB.
The output spectrum central wavelength of the AWG router of 6. the utility model of table
The output spectrum insertion loss of the AWG router of 7. the utility model of table
From the embodiments above as can be seen that by using the utility model method, can make AWG router output frequency
Spectral difference is different to be reduced to 1dB hereinafter, and can also play the effect for reducing frequency difference.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (6)
1. the uniform AWG router of frequency spectrum is realized in a kind of filter and input channel cascade, it is characterised in that: filtered including N item
Input waveguide (01), N-1 filter (02), 2N-1 AWG input waveguide (03), array waveguide grating (04) and the output of N item
Waveguide (05)；Free Spectral Range is greater than 2 × N times of channel wavelength interval in array waveguide grating (04), array waveguide grating
(04) there is 2N-1 I/O channel, the central input port of array waveguide grating (04), i.e. n-th input port, warp
One AWG input waveguide (03) and the 1st filtering input waveguide (01) connection；For in array waveguide grating in addition to center input terminal
N-th of input port and the N+n input port are formed one group of input port by other input ports other than mouthful, and respectively
The output end of same filter (02) is connected to through respective AWG input waveguide (03), total N-1 group input port is connected to N-
1 filter (02), the input terminal of N-1 filter (02) are connected with remaining N-1 filtering input waveguide (01) respectively.
2. the uniform AWG router of frequency spectrum is realized in a kind of filter according to claim 1 and input channel cascade, special
Sign is: the filter (02) is 1 × 2 filter, and input light is carried out light-splitting processing.
3. the uniform AWG router of frequency spectrum is realized in a kind of filter according to claim 1 and input channel cascade, special
Sign is: N number of light positioned at intermediate wavelength is input to N item filtering input waveguide (01) and then enters in diffraction time wave-length coverage
It is defeated from remaining the N-1 filtering input waveguide (01) in addition to the 1st filters input waveguide (01) in array waveguide grating (04)
The light entered is split the two-beam different for wavelength through respective filter, then respectively enters array waveguide grating (04)
Then two input channels export after array waveguide grating (04) Wavelength routing from output waveguide (05).
4. the uniform AWG router of frequency spectrum is realized in a kind of filter according to claim 1 and input channel cascade, special
Sign is: the array waveguide grating (04) mainly by from be input to output be sequentially arranged input waveguide zone, array
Waveguide section and output waveguide zone are constituted, and Waveguide array area is located between input waveguide zone and output waveguide zone.
5. the uniform AWG router of frequency spectrum is realized in a kind of filter according to claim 1 and input channel cascade, special
Sign is: other input ports other than array waveguide grating (04) central input port use 1 × 2 filter and two
AWG input waveguide (03) cascade is inputted, so that after being originally inputted light and being input to array waveguide grating (04) corresponding channel,
When the corresponding output spectrum of light of a certain part wavelength is unsatisfactory for AWG Wavelength routing condition, according in array waveguide grating (04)
The light for being originally inputted the part wavelength in light is passed through other than array waveguide grating (04) corresponding channel by the Wavelength routing relationship in portion
Another input channel.
6. the uniform AWG router of frequency spectrum is realized in a kind of filter according to claim 1 and input channel cascade, special
Sign is: the filter is using cascading Mach Zeng Deer interferometer structure.
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| CN108398743A (en) * | 2018-05-22 | 2018-08-14 | 浙江大学 | The uniform AWG routers of frequency spectrum are realized in filter and input channel cascade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108398743A (en) * | 2018-05-22 | 2018-08-14 | 浙江大学 | The uniform AWG routers of frequency spectrum are realized in filter and input channel cascade |
| CN108398743B (en) * | 2018-05-22 | 2023-10-31 | 浙江大学 | AWG router for realizing spectrum uniformity by cascading filter and input channel |
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