CN209248084U - A kind of Mux, Demux filter of flattening filter and its composition - Google Patents
A kind of Mux, Demux filter of flattening filter and its composition Download PDFInfo
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Abstract
The utility model relates to technical field of photo communication, and in particular to Mux, Demux filter of a kind of flattening filter and its composition.A kind of flattening filter, including Cell unit, Cell unit includes 2 MMI optical power distributors, 3 directional couplers and 4 groups of interfere arms, MMI-DC-DC-MMI-DC is connected by 4 groups of interfere arms in sequence for 2 MMI optical power distributors and 3 directional couplers, wherein MMI indicates MMI optical power distributor, DC indicates directional coupler, every group of interfere arm includes two different interfere arms of length, the port 1 or port 3 of first MMI optical power distributor are multiplex outgoing or entry port and the port In as Cell unit in sequence, the port 2 and port 4 of the last one directional coupler are partial wave incidence or exit portal in sequence, and respectively as the port Out1 and the port Out2 of Cell unit.The substantial effect of the utility model is: the utility model optimizes the directional coupler of lattice filter, to realize high performance MUX and DEMUX lattice filter.
Description
Technical field
The utility model relates to technical field of photo communication, and in particular to a kind of flattening filter and its Mux of composition,
Demux filter.
Background technique
With the development of today's society mechanics of communication, explosion is presented in the data traffic generated in various communication process
The growth of formula.The transmission and processing of these data in the data center need the carrier of more high speed to meet flow growth
Demand.Optical fiber is low since its rate height is lost, thus become data transmission media more efficient than cable, it is more and more extensive
Be used in data center inside data transmission among.It needs to integrate corresponding optical filter in optical module, realizes different waves
The multiplexing (MUX) of long light and demultiplexing (DEMUX).For MUX the and DEMUX optical filter of existing integreted phontonics, realization
Method is roughly divided into two major classes.The first kind is finite impulse response Finite Impulse response (FIR) filter；Also
One kind is infinite-duration impulse response Infinite Impulse response (IIR) filter.FIR filter be usually used in MUX and
The realization of DEMUX optical filter, including array waveguide grating (Arrayed waveguide grating:AWG)；Reflective rank
Terraced grating (Echelle Grating:EDG)；Lattice filter (Lattice Filter).In optical module, due to laser
Output wavelength have certain temperature drift, the spectral response of filter needs the passband with flat-top to go to agree with this temperature drift,
Realize stable MUX and DEMUX function.At the same time the insertion loss (Insertion loss:IL) of filter should to the greatest extent can
Can it is small, reduce the power consumption of optical module.And MUX the and DEMUX optical filter of existing integreted phontonics type, usually using AWG or
The solution of person EDG.Both filters realize the flat-top of spectral response, are to go to realize as cost to sacrifice IL.It passes
The lattice filter of system can be realized the passband of flat-head type, and not to sacrifice IL as cost.But since CWDM is in O wave
The wavelength width of the application covering of section is greater than 80nm, and the directional coupler in traditional lattice filter usually can not achieve so
Long planarization coupling efficiency, will increase the crosstalk of device.
Chinese patent CN204101770U, publication date on January 14th, 2015, a kind of gain smoothing filter, including one is single
Optical fiber head, an optical filter, collimating lens and a single optical fiber calibrator, the optical filter are fixed on going out for the single fiber head
Smooth surface and the optical filter cover the fiber core of the single fiber head, and the single fiber head, collimation lens and single fiber are quasi-
Straight device is set in same horizontal line and sets gradually, and a distance d, the standard are equipped between the single fiber head and the collimation lens
Straight lens and single optical fiber calibrator are equipped with distance D.By the way that optical filter to be fixed in the light pass surface of single fiber head, so that optical filter
Size can greatly reduce, and therefore, the price of optical filter is lower, greatly reduce device cost.It is real by setting isolator core
The filtering and reverse isolation of existing optical path, and small product size is small, it is at low cost.But it not can solve the flat of current filter spectrum response
Topization is to sacrifice the problem of IL is cost.
Utility model content
Technical problem to be solved by the utility model is: the flat-top of filter spectrum response at present is to sacrifice IL as cost
The technical issues of.Propose a kind of flattening filter of filter unit being made of the cascade of Mach-Cen Deer interferometer and its
Mux, Demux filter of composition.
In order to solve the above technical problems, technical solution adopted in the utility model are as follows: a kind of flattening filter, including
Cell unit, the Cell unit include 2 MMI optical power distributors, 3 directional couplers and 4 groups of interfere arms, the 2 MMI light
MMI-DC-DC-MMI-DC is connected by 4 groups of interfere arms in sequence for power splitter and 3 directional couplers, and wherein MMI indicates MMI light
Power splitter, DC indicate directional coupler, and every group of interfere arm includes two different interfere arms of length, first in the sequence
The port 1 or port 3 of a MMI optical power distributor are that multiplex is emitted or entry port and the port In as Cell unit, described suitable
The port 2 and port 4 of the last one directional coupler are partial wave incidence or exit portal in sequence, and respectively as Cell unit
The port Out1 and the port Out2.Each Cell unit is made of four groups of Mach-Cen Deer interferometer cascades.This four groups
5 energy beam splitting/bundling devices in Mach-Cen Deer interferometer are made of 2 MMI and 3 directional couplers respectively；4 groups dry
Arm is related to be made of the waveguide of different length.The input and output of each group of interfere arm respectively correspond 2 ports of MMI and directional coupler
Input and output, thus four groups of Mach-Cen Deer interferometers of cascade.The interference as caused by arm length difference can be improved filter spectrum and ring
The flat-top degree answered.The MMI refers to multiple-mode interfence MMI (Multi-mode Interference, MMI) optical power distributor, is used for
Partial wave.
Preferably, the waveguide of the directional coupler is divided into energy coupling area and phase controlling area, the energy coupling
Area is distributed in phase controlling area two sides, and two duct widths of the directional coupler in the energy coupling area are identical, the phase
Position control zone in directional coupler two waveguides it is of different size and different from the duct width in energy coupling area, it is described
There is gradual change centrum waveguide linkage section between energy coupling area and the waveguide of phase controlling area.Energy coupling area is mainly used for two waves
The coupling of energy between leading；The width in phase controlling area, two neighboring waveguide is not consistent, leads to the propagation of mode in two waveguides
Constant is not consistent, and energy coupling is extremely weak, the main control realized for different wave length light phase.By rationally controlling two energy
Amount coupling section length and the width/height in phase controlling area, can be realized the flat-top of wide range energy coupling efficiency, thus real
Mux and the Demux function of existing low crosstalk, energy coupling section length take the value in usual range, the width or length in phase controlling area
The relatively figure of merit of degree can carry out limited times test according to specific communication wavelengths and obtain.
Preferably, the arm length difference of two interfere arms of every group of interfere armWherein FSR is Communication ray
4 times of wavelength interval, ngFor the group index of waveguide, λ is the effective refractive index of waveguide.Each Cell is by four groups of horses
The cascade of He-Cen Deer interferometer is constituted.Each group of interfere arm is made of the waveguide of two different lengths, the brachium of this two waveguides
Difference needs to be calculated according to channel spacing and the effective refractive index of waveguide and group index, meets certain phase relation, Ke Yijin
One step improves the flat-top degree of filter spectrum response.
A kind of planarization Mux filter is made of flattening filter as the aforementioned cascade, including 3 Cell units, the
The port In of one Cell unit is multiplex exit portal, the port In of second Cell unit and the Out2 of first Cell unit
Port coupling, the port In of third Cell unit are coupled with the port Out1 of first Cell unit, second Cell unit
And the port Out1, Out2 of third Cell unit is partial wave entrance port.
A kind of planarization Demux filter is made of flattening filter as the aforementioned cascade, including 9 Cell units,
The port In of first Cell unit is multiplex entry port, the port In of second Cell unit and first Cell unit
The connection of the port Out2, the port In of third Cell unit are connect with the port Out1 of first Cell unit, the 4th Cell
The port In of unit is connect with the port Out2 of second Cell unit, the port In of the 5th Cell unit and third Cell
The port Out1 of unit connects, the port Out1 and the port Out2 difference of the 4th Cell unit and the 5th Cell unit
It is connect with the port In of remaining four Cell units, the port Out2 of remaining four Cell units is partial wave outgoing
Mouthful.The unit cascaded control that can effectively enhance to crosstalk of 9 Cell.
The substantial effect of the utility model is: the utility model optimizes the directional coupler of lattice filter, thus
High performance MUX and DEMUX lattice filter is realized, the flat-top degree of filter spectrum response is improved, reduces crosstalk.
Detailed description of the invention
Fig. 1 is one Cell cellular construction schematic diagram of embodiment.
Fig. 2 is one directional coupler waveguiding structure schematic diagram of embodiment.
Fig. 3 is two Mux filter construction schematic diagram of embodiment.
Fig. 4 is three Demux filter construction schematic diagram of embodiment.
Wherein: 1, interfere arm, 2, directional coupler, 3, Cell unit, 4, MMI optical power distributor, 5, energy coupling area, 6, gradually
Become centrum waveguide linkage section, 7, phase controlling area.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, specific embodiment of the present utility model is made further specific
Explanation.
Embodiment one:
A kind of flattening filter, as shown in Figure 1, being one Cell cellular construction schematic diagram of embodiment, the present embodiment includes
Cell unit 3, Cell unit 3 include 2 MMI light function of directional coupler 2 and 4 group interfere arm 1,2 of MMI optical power distributor 4,3
Dividing device 4 and 3 directional coupler 2, MMI-DC-DC-MMI-DC is connected by 4 groups of interfere arms 1 in sequence, and wherein MMI indicates MMI
Optical power distributor 4, DC indicate directional coupler 2, and every group of interfere arm 1 includes the different interfere arm 1 of two length, first in sequence
The port 1 or port 3 of MMI optical power distributor 4 are that multiplex is emitted or entry port and the port In as Cell unit 3, in sequence
The port 2 and port 4 of the last one directional coupler 2 are partial wave incidence or exit portal, and respectively as Cell unit 3
The port Out1 and the port Out2.Each Cell unit 3 is made of four groups of Mach-Cen Deer interferometer cascades.This four
5 energy beam splitting/bundling devices in group Mach-Cen Deer interferometer are made of 2 MMI and 3 directional couplers 2 respectively；4 groups
Interfere arm 1 is made of the waveguide of different length.The input and output of each group of interfere arm 1 respectively correspond MMI and directional coupler 2
2 port input and output, thus four groups of Mach-Cen Deer interferometers of cascade.The interference as caused by arm length difference can be improved filter
The flat-top degree of spectral response.MMI refers to multiple-mode interfence MMI (Multi-mode Interference, MMI) optical power distributor, uses
In partial wave.
As shown in Fig. 2, being one directional coupler waveguiding structure schematic diagram of embodiment, the waveguide of directional coupler 2 is divided into energy
Amount coupled zone 5 and phase controlling area 7, energy coupling area 5 are distributed in 7 two sides of phase controlling area, the direction coupling in energy coupling area 5
Two duct widths of clutch 2 are identical, two waveguides of the directional coupler 2 in phase controlling area 7 of different size and with
The duct width in energy coupling area 5 is different, there is gradual change centrum waveguide between 7 waveguide of energy coupling area 5 and phase controlling area
Linkage section 6.Energy coupling area 5 is mainly used for the coupling of energy between two waveguides；Phase controlling area 7, the width of two neighboring waveguide
It spends not consistent, causes the propagation constant of mode in two waveguides not consistent, energy coupling is extremely weak, main to realize for different waves
The control of long light phase.It, can by rationally controlling the width/height of 5 length of Liang Ge energy coupling area and phase controlling area 7
Realize the flat-top of wide range energy coupling efficiency, to realize Mux and the Demux function of low crosstalk, 5 length of energy coupling area is taken
Value in usual range, the width in phase controlling area 7 or the relatively figure of merit of length can carry out limited times according to specific communication wavelengths
Test obtains.
The arm length difference of two interfere arms 1 of every group of interfere arm 1Wherein FSR is the 4 of Communication ray wavelength interval
Times, ngFor the group index of waveguide, λ is the effective refractive index of waveguide.Each Cell is interfered by four groups of Mach-Cen Deer
Instrument cascade is constituted.Each group of interfere arm 1 is made of the waveguide of two different lengths, and the arm length difference of this two waveguides is needed according to logical
The effective refractive index of road interval and waveguide and group index calculate, and meet certain phase relation, can be further improved filtering
The flat-top degree of device spectral response.
Embodiment two:
A kind of planarization Mux filter, the flattening filter cascade recorded by embodiment one forms, as shown in figure 3, being
Two Mux filter construction schematic diagram of embodiment, the present embodiment include 3 Cell units 3, the port In of first Cell unit 3
For multiplex exit portal, the port In of second Cell unit 3 is coupled with the port Out2 of first Cell unit 3, third
The port In of Cell unit 3 is coupled with the port Out1 of first Cell unit 3, second Cell unit 3 and third
The port Out1, Out2 of Cell unit 3 is partial wave entrance port.
Embodiment three:
A kind of planarization Demux filter, the flattening filter cascade recorded by embodiment one form, as shown in figure 4,
For three Demux filter construction schematic diagram of embodiment, the present embodiment includes 9 Cell units 3, the In of first Cell unit 3
Port is multiplex entry port, and the port In of second Cell unit 3 is connect with the port Out2 of first Cell unit 3, the
The port In of three Cell units 3 is connect with the port Out1 of first Cell unit 3, the port In of the 4th Cell unit 3
It is connect with the port Out2 of second Cell unit 3, the port In and the third Cell unit 3 of the 5th Cell unit 3
The connection of the port Out1, the port Out1 and the port Out2 of the 4th Cell unit 3 and the 5th Cell unit 3 respectively with it is surplus
The port In of four remaining Cell units 3 connects, and the port Out2 of remaining four Cell units 3 is partial wave exit portal.9
Cell unit 3 cascades the control that can effectively enhance to crosstalk.
Embodiment described above is a kind of preferable scheme of the utility model, is not made to the utility model any
Formal limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (4)
1. a kind of flattening filter, which is characterized in that
Including Cell unit, the Cell unit includes 2 MMI optical power distributors, 3 directional couplers and 4 groups of interfere arms, described
MMI-DC-DC-MMI-DC is connected by 4 groups of interfere arms in sequence for 2 MMI optical power distributors and 3 directional couplers, wherein MMI
Indicate that MMI optical power distributor, DC indicate directional coupler, every group of interfere arm includes two different interfere arms of length, described
The port 1 or port 3 of first MMI optical power distributor are multiplex outgoing or entry port and the end In as Cell unit in sequence
Mouthful, the port 2 and port 4 of the last one directional coupler are that partial wave is incident or exit portal in the sequence, and respectively as
The port Out1 and the port Out2 of Cell unit.
2. a kind of flattening filter according to claim 1, which is characterized in that
The waveguide of the directional coupler is divided into energy coupling area and phase controlling area, and the energy coupling area is distributed in phase control
Two duct widths of area two sides processed, the directional coupler in the energy coupling area are identical, the side in the phase controlling area
To of different size and different from the duct width in energy coupling area, the energy coupling Qu Yuxiang of two waveguides of coupler
There is gradual change centrum waveguide linkage section between the control zone waveguide of position.
3. a kind of planarization Mux filter is made of flattening filter as described in claim 1 cascade, which is characterized in that
Including 3 Cell units, the port In of first Cell unit is multiplex exit portal, the port In of second Cell unit and the
The port the Out2 coupling of one Cell unit, the port the Out1 coupling of the port In of third Cell unit and first Cell unit
It closes, the port Out1, Out2 of second Cell unit and third Cell unit is partial wave entrance port.
4. a kind of planarization Demux filter is made of flattening filter as described in claim 1 cascade, feature exists
In, including 9 Cell units, the port In of first Cell unit are multiplex entry port, the end In of second Cell unit
Mouth is connect with the port Out2 of first Cell unit, the port In of third Cell unit and the Out1 of first Cell unit
Port connection, the port In of the 4th Cell unit are connect with the port Out2 of second Cell unit, the 5th Cell unit
The port In connect with the port Out1 of third Cell unit, the Out1 of the 4th Cell unit and the 5th Cell unit
Port and the port Out2 are connect with the port In of remaining four Cell units respectively, remaining four Cell units
The port Out2 is partial wave exit portal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541753A (en) * | 2018-12-30 | 2019-03-29 | 杭州芯耘光电科技有限公司 | A kind of Mux, Demux filter of flattening filter and its composition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541753A (en) * | 2018-12-30 | 2019-03-29 | 杭州芯耘光电科技有限公司 | A kind of Mux, Demux filter of flattening filter and its composition |
| CN109541753B (en) * | 2018-12-30 | 2024-10-15 | 杭州芯耘光电科技有限公司 | Flattening filter and Mux and Demux filter formed by flattening filter |
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