CN209299268U - A kind of integrated coherent receiver - Google Patents
A kind of integrated coherent receiver Download PDFInfo
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- CN209299268U CN209299268U CN201920312696.XU CN201920312696U CN209299268U CN 209299268 U CN209299268 U CN 209299268U CN 201920312696 U CN201920312696 U CN 201920312696U CN 209299268 U CN209299268 U CN 209299268U
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- frequency mixer
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Abstract
This application discloses a kind of integrated coherent receivers, and the integrated coherent receiver volume for solving the prior art is big, the big problem of optical path loss.Including the first polarization beam apparatus, the second polarization beam apparatus, the first frequency mixer, the second frequency mixer and PD array.The waveguide material that integrated coherent receiver uses is silicon based silicon dioxide.The structure of first polarization beam apparatus and the second polarization beam apparatus is Mach-Zehnder interferometer, inputs local light and signal light respectively, local light and signal light are divided into TE mode and TM mode.The TE mode optical signal of local light and signal light exports four optical signals that energy is equal, phase is different after inputting the mixing of the first frequency mixer, and TM mode optical signal exports four optical signals that energy is equal, phase is different after inputting the mixing of the second frequency mixer.Each of PD array PD is coupled and aligned an output waveguide, and the optical signal of output is converted to electric signal.Have the advantages that volume can be reduced, is convenient for production, reduces optical path loss.
Description
Technical field
This application involves optical communication field more particularly to a kind of integrated coherent receivers.
Background technique
With 5G communication development and gradually apply, the requirement to communication system is higher and higher.Coherent reception system and straight
Reception system is compared, and other than having the advantages such as selectivity is good, sensitivity is high, channel speed can be reduced under same traffic rate
Rate reduces the requirement to electronic device rate, can improve dispersion tolerance.
The integrated receiver reported at present can be divided into two class of free space type and full fiber type: be based on Free Space Optics
Coherent receiver by 90 ° of frequency mixers of Free Space Optics, PD array and high frequency transmission circuit composition are widely used in early days
In coherent optical communication system, but it is to be assembled by multiple optical components, therefore optical path is very complicated, and cost of manufacture is very high, separately
Outside since volume is larger, it is unsatisfactory for the regulation of size in OIF standard；Coherent receiver based on all -fiber type is by optical-fiber type
90 ° of frequency mixers, PD array and high-frequency circuit form, and performance can satisfy coherent light communication requirement, be integrated in high speed PD array
It is extremely difficult that receiver is made together, while volume is larger, is unsatisfactory for the regulation of size in OIF standard.
Therefore, the utility model proposes a kind of integrated coherent receivers, solve the integrated coherent receiver of the prior art
Volume is big, the big problem of optical path loss, has the advantages that volume can be reduced, is convenient for production, reduces optical path loss.
Utility model content
The application proposes a kind of integrated coherent receiver, and the integrated coherent receiver volume for solving the prior art is big, light
Path loss consumes big problem.
The embodiment of the present application provides a kind of integrated coherent receiver, including the first polarization beam apparatus, the second polarization beam apparatus,
First frequency mixer, the second frequency mixer and PD array.
The waveguide material that the integrated coherent receiver uses is silicon based silicon dioxide.
The structure of first polarization beam apparatus and the second polarization beam apparatus is Mach-Zehnder interferometer, inputs this respectively
The local light and signal light are divided into TE mode and TM mode by ground light and signal light.
Energy is equal, phase for output after the TE mode optical signal of the local light and signal light inputs the mixing of the first frequency mixer
Four different optical signals, TM mode optical signal input after the second frequency mixer is mixed output energy is equal, phase is different four
Optical signal.
Each of PD array PD is coupled and aligned one in first frequency mixer and the second frequency mixer output
The optical signal that first frequency mixer and the second frequency mixer export is converted to electric signal by waveguide.
Preferably, first frequency mixer and the output end of the second frequency mixer output waveguide are to be in lightray propagation direction
The section of 45° angle.
Preferably, it is (more to respectively include upper arm, lower arm, the first MMI for first polarization beam apparatus, the second polarization beam apparatus
Mode interference type coupler) and the 2nd MMI.
Optical signal inputs the first MMI and is divided into two bundles, and transmits respectively along upper and lower arms, after then being coupled at the 2nd MMI,
It is exported by different port.
Preferably, first frequency mixer and the second frequency mixer are 90 ° of frequency mixers, and the light of the TM mode/TE mode is believed
Number mixing after export four optical signals phase be respectively 0 °, 180 °, 90 ° and 270 °.
Preferably, first polarization beam apparatus, the second polarization beam apparatus, the first frequency mixer and the second frequency mixer are integrated in
Same chip.
Preferably, the integrated coherent receiver further includes two difference amplifiers, and each difference amplifier connects four
PD, the micro current signal differential amplification by PD input are voltage signal.
Preferably, the integrated coherent receiver further includes high-speed transmission equipment, is used to connect with external devices, output letter
Number.
Preferably, the PD array and first frequency mixer and the second frequency mixer output waveguide pass through infrared imaging method
Carry out coupling symmetrical monitoring.
Preferably, the duct width and length of the upper arm or lower arm are optimized, changes input optical signal
Effective refractive index realizes the separation of TE/TM mode.
The embodiment of the present application use at least one above-mentioned technical solution can reach it is following the utility model has the advantages that
The Surface Mount component testing load plate, which has, can protect Surface Mount component not contaminated and damage, raising work effect
Rate can fix multiple load plates stacked, facilitate the advantages of carrying.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is a kind of structure chart of integrated coherent receiver provided by the embodiments of the present application；
Fig. 2 is the structure chart of the first polarization beam apparatus and the second polarization beam apparatus provided by the embodiments of the present application；
Fig. 3 is the schematic diagram of the first frequency mixer and the second frequency mixer provided by the embodiments of the present application；
Fig. 4 is the first frequency mixer provided by the embodiments of the present application and the knot that the second frequency mixer output waveguide is coupled with PD array
Composition；
Fig. 5 is the structure chart of another integrated coherent receiver provided by the embodiments of the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.
Below in conjunction with attached drawing, the technical scheme provided by various embodiments of the present application will be described in detail.
Fig. 1 is a kind of structure chart of integrated coherent receiver provided by the embodiments of the present application, the integrated coherent receiver
Including the first polarization beam apparatus, the second polarization beam apparatus, the first frequency mixer, the second frequency mixer and PD array.
The waveguide material that the integrated coherent receiver uses is silicon based silicon dioxide.First polarization beam apparatus and
The structure of two polarization beam apparatus is Mach-Zehnder interferometer, inputs local light and signal light respectively, by the local light and signal
Light is divided into TE mode and TM mode.The TE mode optical signal of the local light and signal light exports after inputting the mixing of the first frequency mixer
Four optical signals that energy is equal, phase is different, energy is equal, phase for output after TM mode optical signal inputs the mixing of the second frequency mixer
Four different optical signals of position.Each of PD array PD is coupled and aligned in first frequency mixer and the second frequency mixer
An output waveguide, the optical signal that first frequency mixer and the second frequency mixer export is converted into electric signal.
The PD number that the PD array includes is equal to the sum of first frequency mixer and the second frequency mixer output waveguide number.
When the integrated coherent receiver works, the first polarization beam apparatus of Xiang Suoshu inputs local optical signal, the polarization point of Xiang Suoshu second
Beam device input signal light.First polarizer and the second polarizer will by separating the polarization state of the local light and signal light
The local light and signal light are respectively divided into TE mode and TM mode.First frequency mixer receive local light TE mode and
The TE mode of signal light exports four optical signals that energy is equal, phase is different after mixing.Second frequency mixer receives local
The TM mode of light and the TM mode of signal light export four optical signals that energy is equal, phase is different after mixing.It is PD gusts described
Each of column PD is coupled and aligned an output waveguide in first frequency mixer and the second frequency mixer, and described first is mixed
Frequency device and eight optical signals of the second frequency mixer output are converted to eight electric signals.
In the present embodiment, first polarization beam apparatus, the second polarization beam apparatus, the first frequency mixer and the second frequency mixer
It is integrated in same chip.Since the waveguide material that the integrated coherent receiver uses is silicon based silicon dioxide, described first partially
Vibration beam splitter, the second polarization beam apparatus, the first frequency mixer and the second frequency mixer are integrated in same silicon base chip, first polarization
Beam splitter, the second polarization beam apparatus, the first frequency mixer and the second frequency mixer waveguide material be silicon based silicon dioxide.It reduces
The volume of the integrated coherent receiver expands application range convenient for the manufacture of the integrated coherent receiver.It reduces simultaneously
Energy loss in lightray propagation path, improves coupling efficiency.
Fig. 2 is the structure chart of the first polarization beam apparatus and the second polarization beam apparatus provided by the embodiments of the present application, described the
One polarization beam apparatus and the second polarization beam splitter structure are Mach-Zehnder interferometer, including upper arm 1, lower arm 2,3 and of the first MMI
2nd MMI 4.
Optical signal inputs the first MMI and is divided into two bundles, and transmits respectively along upper and lower arms, after then being coupled at the 2nd MMI,
It is exported by different port.
In the present embodiment, when the duct width of polarization beam apparatus not simultaneously as waveguide core layer cross section geometry
There are different effective refractive indexs to TE/TM mode under structure and stress.It can be by upper arm in the polarization beam apparatus
Or the duct width and length of lower arm optimize, and change the effective refractive index to input optical signal, to realize TE/TM
The separation of mode.
In silicon substrate monomode optical waveguide, the effective refractive index of TE/TM mode is as follows:
nTE=nTE0-C1σx-C2(σy+σz) (1)
nTM=nTM0-C1σy-C2(σx+σz) (2)
Wherein, nTE0And nTM0It is the effective refractive index of the TE/TM mode determined by the geometry of optical waveguide；C1And C2Point
Not Biao Shi silica-base material photoelastic constant, σx、σyAnd σzIt is stress of the optical waveguide in level, the vertical and direction of propagation respectively.
It is as follows to input birefringent difference of the TE/TM mode of the optical signal of the polarization beam apparatus in silicon substrate optical waveguide:
B=Bg+Bs (3)
Bs=(σx-σy)(C1-C2) (4)
Bg=nTM0-nTE0 (5)
Wherein, BsAnd BgIt is respectively birefringent as caused by stress and as caused by geometry it is birefringent.Therefore institute is utilized
Silica-based waveguides are stated to the birefringent feature of TE/TM mode, to the duct width and length of upper arm in the polarization beam apparatus or lower arm
Degree optimizes, and finally can be realized TE/TM modal cutoff.
As embodiments herein, optical signal is inputted from the input terminal port1 or port2 of the polarization beam apparatus, warp
It crosses the first MMI and realizes 3dB light splitting, optical signal is divided into two bundles.Two-beam signal is transmitted along upper and lower arms respectively, due to TE/
Propagation constant of the TM mode in wide waveguide is different, therefore the phase of the TE/TM mode for the optical signal propagated through upper and lower arms
Delay is different, and the length by optimizing wide waveguide makes 180 ° of TE/TM call by pattern phase difference, the two-beam of upper and lower arms output
Signal is coupled at the 2nd MMI, since the phase difference of TE/TM mode is different, to make TE/TM mode respectively from different
Output port output, realizes TE/TM modal cutoff.
Fig. 3 is the schematic diagram of the first frequency mixer and the second frequency mixer provided by the embodiments of the present application, as shown in figure 3, described
First frequency mixer or the second frequency mixer include four input terminals and four output ends.For example, in first frequency mixer work,
The TE signal input port 1 of the local light or port 2, the TE signal input port 3 of the signal light or port 4.By institute
Four optical signals that energy is equal, phase is different are exported after stating the mixing of the first frequency mixer.It is described when second frequency mixer works
The TM signal input port 1 of local light or port 2, the TM signal input port 3 of the signal light or port 4.By described
Four optical signals that energy is equal, phase is different are exported after the mixing of two frequency mixers.
As the optimization of the embodiment of the present application, first frequency mixer and the second frequency mixer are 90 ° of frequency mixers, the TM mould
Exporting the phase of four optical signals after the mixing of formula/TE mode optical signal is respectively 0 °, 180 °, 90 ° and 270 °.
Fig. 4 is the first frequency mixer provided by the embodiments of the present application and the knot that the second frequency mixer output waveguide is coupled with PD array
Composition, as shown in figure 4, first frequency mixer and the output end of the second frequency mixer output waveguide are to be in lightray propagation direction
The section of 45° angle.
In the present embodiment, the output waveguide output end of first frequency mixer or the second frequency mixer and lightray propagation side
The lightray propagation direction exported by the output waveguide can be made to change 90 ° to the section in 45° angle, further make institute
Stating each output waveguide can be coupled by the method for packaging passive alignment with the photosurface of a PD in the PD array, be reached most
Big coupling efficiency.
Since the output waveguide and the photosurface of PD couples using the method for packaging passive alignment, the PD array and described the
One frequency mixer and the second frequency mixer output waveguide can carry out coupling symmetrical monitoring by infrared imaging method.I.e. using described defeated
The hot spot of waveguide output carries out optical position monitoring out, changes the current monitoring method of script, avoids measurement PD array electricity
Additional progress gold wire bonding is needed when stream and the possibility of high frequency characteristics is destroyed.
Fig. 5 is the structure chart of another integrated coherent receiver provided by the embodiments of the present application, as shown in figure 5, the collection
It further include two difference amplifiers at coherent receiver, each difference amplifier connects four PD, and the micro-current of PD input is believed
Number differential amplification is voltage signal.
In the present embodiment, each difference amplifier is defeated for amplifying first frequency mixer or the second frequency mixer
The electric signal that optical signal out is converted to.
Preferably, the integrated coherent receiver further includes high-speed transmission equipment, is used to connect with external devices, output letter
Number.The high-speed transmission equipment is a transitional facility in the integrated coherent receiver, can be used as one and presents and opens down,
And the size of its high frequency bandwidth is directly related to the bandwidth of receiver.
It should be understood by those skilled in the art that, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, commodity or equipment including a series of elements are not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, commodity or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, commodity or equipment including the element.
The above description is only an example of the present application, is not intended to limit this application.For those skilled in the art
For, various changes and changes are possible in this application.All any modifications made within the spirit and principles of the present application are equal
Replacement, improvement etc., should be included within the scope of the claims of this application.
Claims (9)
1. a kind of integrated coherent receiver, which is characterized in that mixed including the first polarization beam apparatus, the second polarization beam apparatus, first
Frequency device, the second frequency mixer and PD array；
The waveguide material that the integrated coherent receiver uses is silicon based silicon dioxide；
The structure of first polarization beam apparatus and the second polarization beam apparatus is Mach-Zehnder interferometer, inputs local light respectively
And signal light, the local light and signal light are divided into TE mode and TM mode；
Energy is equal, phase is different for output after the TE mode optical signal of the local light and signal light inputs the mixing of the first frequency mixer
Four optical signals, TM mode optical signal inputs output energy is equal, phase is different four light letter after the mixing of the second frequency mixer
Number；
Each of PD array PD is coupled and aligned an output waveguide in first frequency mixer and the second frequency mixer,
The optical signal that first frequency mixer and the second frequency mixer export is converted into electric signal.
2. integrated coherent receiver as described in claim 1, which is characterized in that first frequency mixer and the second frequency mixer are defeated
The output end of waveguide is the section with lightray propagation direction in 45° angle out.
3. integrated coherent receiver as described in claim 1, which is characterized in that first polarization beam apparatus, the second polarization
Beam splitter respectively includes upper arm, lower arm, the first MMI and the 2nd MMI；
Optical signal inputs the first MMI and is divided into two bundles, and transmits respectively along upper and lower arms, after then coupling at the 2nd MMI, by not
It is exported with port.
4. integrated coherent receiver as described in claim 1, which is characterized in that first frequency mixer and the second frequency mixer are
90 ° of frequency mixers, exported after the optical signal mixing of the TM mode/TE mode phase of four optical signals be respectively 0 °, 180 °,
90 ° and 270 °.
5. integrated coherent receiver as described in claim 1, which is characterized in that first polarization beam apparatus, the second polarization
Beam splitter, the first frequency mixer and the second frequency mixer are integrated in same chip.
6. integrated coherent receiver as described in claim 1, which is characterized in that the integrated coherent receiver further includes two
Difference amplifier, each difference amplifier connect four PD, and the micro current signal differential amplification by PD input is voltage signal.
7. integrated coherent receiver as described in claim 1, which is characterized in that the integrated coherent receiver further includes high speed
Transmission device is used to connect with external devices, output signal.
8. integrating coherent receiver as claimed in claim 2, which is characterized in that the PD array and first frequency mixer and
Second frequency mixer output waveguide carries out coupling symmetrical monitoring by infrared imaging method.
9. integrated coherent receiver as claimed in claim 3, which is characterized in that duct width to the upper arm or lower arm and
Length optimizes, and changes the effective refractive index of input optical signal, realizes the separation of TE/TM mode.
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| CN201920312696.XU CN209299268U (en) | 2019-03-12 | 2019-03-12 | A kind of integrated coherent receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109728857A (en) * | 2019-03-12 | 2019-05-07 | 湖北捷讯光电有限公司 | A kind of integrated coherent receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109728857A (en) * | 2019-03-12 | 2019-05-07 | 湖北捷讯光电有限公司 | A kind of integrated coherent receiver |
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