CN109375316A - A kind of optical mixer - Google Patents
A kind of optical mixer Download PDFInfo
- Publication number
- CN109375316A CN109375316A CN201811422079.1A CN201811422079A CN109375316A CN 109375316 A CN109375316 A CN 109375316A CN 201811422079 A CN201811422079 A CN 201811422079A CN 109375316 A CN109375316 A CN 109375316A
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- Prior art keywords
- beam splitter
- curved waveguide
- output
- input
- multimode
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2808—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs
- G02B6/2813—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs based on multimode interference effect, i.e. self-imaging
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The invention discloses a kind of optical mixers, are related to coherent light communication field.Optical mixer includes 2 input beam splitters and 2 output beam splitters；2 input beam splitters are the beam splitter of n × 2, first input beam splitter is used for: after being split to signal light, 2 output beam splitters are transmitted separately to by multimode curved waveguide, second input beam splitter is used for: after being split to local oscillator light, being transmitted separately to 2 output beam splitters by multimode curved waveguide；Multimode curved waveguide is used for: forming the outgoing of basic mode light in multimode curved waveguide exit to the basic mode light for entering multimode curved waveguide；2 output beam splitters are 2 × 2 beam splitters, and the first output beam splitter and the second output beam splitter are used to: receiving the basic mode light of multimode curved waveguide output and export basic mode light.The present invention can improve the yield rate of optical mixer while the bandwidth for expanding optical mixer, reducing the Insertion Loss of optical mixer.
Description
Technical field
The present invention relates to coherent light communication fields, and in particular to a kind of optical mixer.
Background technique
Optical mixer is a vital device in coherent light communication, and for the demodulation of coherent signal, optics is mixed
The phase error of the Exit to all routes of frequency device must be very small.
Optical mixer used at present is generally 2 kinds following:
1, the multimode based on 4 × 4 (4 input terminals and 4 output ends) or 2 × 4 (2 input terminals and 4 output ends) is dry
The optical mixer of interferometer, the optical mixer in use, due to 4 × 4 or 2 × 4 multi-mode interferometers itself characteristic, will lead to
Optical mixer bandwidth is smaller, and Insertion Loss is larger.
2, the optical mixer based on light intersection and 1 × 2 and 2 × 2 beam splitters, each optics of the optical mixer
It is connected between device using single mode waveguide；But the effective refractive index of single mode waveguide is very sensitive to duct width variation, and work
Skill error causes the fluctuation of actual fabrication duct width value inevitable, this just eventually leads to the optical frequency mixing based on single mode waveguide
The phase error fluctuation of device is very big, so that the yield rate of optical mixer is lower.
Summary of the invention
In view of the deficiencies in the prior art, present invention solves the technical problem that are as follows: how expand optical mixer
Bandwidth, reduce optical mixer Insertion Loss while, improve the yield rate of optical mixer.
To achieve the above objectives, optical mixer provided by the invention, including 2 input beam splitters and 2 output beam splitting
Device；
2 input beam splitters are the beam splitter of n × 2, and the first input beam splitter is used for: after being split to signal light, being passed through
Multimode curved waveguide is transmitted separately to 2 output beam splitters, and the second input beam splitter is used for: after being split to local oscillator light, being led to
It crosses multimode curved waveguide and is transmitted separately to 2 output beam splitters；
Multimode curved waveguide is used for: forming base in multimode curved waveguide exit to the basic mode light for entering multimode curved waveguide
The outgoing of mould light；
2 output beam splitters are 2 × 2 beam splitters, and the first output beam splitter and the second output beam splitter are used to: being received
The basic mode light of multimode curved waveguide output, and export basic mode light.
Through the above scheme it is found that the present invention realizes the incidence of basic mode light using 2 beam splitters of n × 2, pass through 22 × 2
The outgoing of beam splitter realization basic mode light；Compared in the prior art 4 × 4 or 2 × 4 multi-mode interferometers, n × 2 of the present invention or 2 ×
2 beam splitters can make optical mixer bandwidth larger, and Insertion Loss is smaller.
At the same time, it is connected between input beam splitter and output beam splitter of the invention by multimode curved waveguide, it is former
Reason is: during waveguide device processing, since there are errors for local lithography and etching, necessarily leading to practical waveguide and sets
Evaluation is different, and even if the same device would also vary from the actual size that different location is worked it out, so phase
The yield rate of type device is difficult to height.But the change rate of waveguide effective index can become smaller with the increase of duct width,
Mean that the multimode waveguide of wider width has higher tolerance to fabrication error, i.e., is based on single mode waveguide compared to existing
Optical mixer, optical mixer can be made to have a biggish process allowance using multimode curved waveguide, craft precision require it is low,
High yield rate.
Based on the above technical solution, the first output end of the first input beam splitter passes through multimode curved waveguide
Be connected with the first input end of the first output beam splitter, first input beam splitter second output terminal by multimode curved waveguide with
The first input end of second output beam splitter is connected；First output end of the second input beam splitter passes through multimode curved waveguide
Be connected with the second input terminal of the first output beam splitter, second input beam splitter second output terminal by multimode curved waveguide with
Second input terminal of the second output beam splitter is connected.
Through the above scheme it is found that the present invention clearly elaborates that the connection between input beam splitter and output beam splitter is closed
System.
Based on the above technical solution, the center of circle of the inner sidewall circular arc of the multimode curved waveguide and lateral wall circular arc
The center of circle be located at different location；
Through the above scheme it is found that generating multiple-mode interfence after the multimode curved waveguide that the entrance of basic mode light is designed in this way, and
Exit forms the outgoing of basic mode light, the longer scene of duct width centerline length suitable for multimode curved waveguide again.
Based on the above technical solution, the inner sidewall of the multimode curved waveguide, with output end section or input terminal
Section is in the angle for being essentially 45 °；The lateral wall of multimode curved waveguide is parallel with inner sidewall.
Based on the above technical solution, in the inner sidewall and lateral wall of the multimode curved waveguide, wherein 1 side
Wall and output end section input end section in essentially 45 ° of angle, and another 1 side wall is arc-shaped.
Through the above scheme it is found that basic mode light generates reflection after entering the multimode curved waveguide being designed in this way, and then going out
The outgoing of basic mode light, the scene shorter suitable for the duct width centerline length of multimode curved waveguide are formed at mouthful again.
Based on the above technical solution, the bending radius of the multimode curved waveguide width centreline along input terminal extremely
The direction at waveguide bend center is gradually reduced, and the direction along waveguide bend center to output end is gradually increased.
Through the above scheme it is found that basic mode light can maintain basic mode to transmit into after being designed in this way multimode curved waveguide, into
And it maintains in exit with the outgoing of basic mode light.
Based on the above technical solution, 2 input beam splitters are respectively 1 × 2 beam splitter and 2 × 2 beam splitters.
Through the above scheme it is found that the phase difference of the emergent light of 2 output ends of 2 × 2 beam splitters is essentially pi/2.
Based on the above technical solution, 2 ends of every section of multimode curved waveguide are provided with straight wave guide.
Based on the above technical solution, all input terminals place and each output point of each input beam splitter
In place of all output ends of beam device, it is provided with straight wave guide.
Through the above scheme it is found that straight wave guide can increase the stability of optical transport.
Based on the above technical solution, each input beam splitter and output beam splitter can be selected multi-mode interferometer or
Directional coupler.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical mixer in the embodiment of the present invention；
Fig. 2 is the schematic diagram that multimode curved waveguide designs (1) in the embodiment of the present invention；
Fig. 3 is the schematic diagram that multimode curved waveguide designs (2) in the embodiment of the present invention；
Fig. 4 is the schematic diagram that multimode curved waveguide designs (5) in the embodiment of the present invention.
In figure: 1- first inputs beam splitter, and 2- second inputs beam splitter, the first output beam splitter of 3-, the output point of 4- second
Beam device, 5- multimode curved waveguide, 6- straight wave guide.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
It is shown in Figure 1, the optical mixer in the embodiment of the present invention, including 5, the 2 input beam splitting of multimode curved waveguide
Device and 2 output beam splitters；
2 input beam splitters are the beam splitter of n × 2 (having 2 output ends), and the first input beam splitter 1 is used for: to signal
After light is split, 2 output beam splitters are transmitted separately to by multimode curved waveguide 5, the second input beam splitter 2 is used for: right
After local oscillator light is split, 2 output beam splitters are transmitted separately to by multimode curved waveguide 5；Wherein 1 input beam splitter
The phase difference of the emergent light of 2 output ends is essentially pi/2；
Multimode curved waveguide 5 is used for: to the basic mode light into multimode curved waveguide 5 in 5 exit shape of multimode curved waveguide
It is emitted at basic mode light；
2 output beam splitters are 2 × 2 beam splitters (having 2 input terminals and 2 output ends), the first output beam splitting
Device 3 and the second output beam splitter 4 are used to: the basic mode light that multimode curved waveguide 5 exports received, and exports basic mode light, 2 outputs
The relative phase difference of the basic mode light of 4 output ends output of beam splitter be respectively 0 °, 180 °, 90 ° and 270 ° (relatively one of them
Port), to realize the mixing of light.
It follows that the present invention realizes the incidence of basic mode light using 2 beam splitters of n × 2, it is real by 22 × 2 beam splitters
The outgoing of existing basic mode light；Compared in the prior art 4 × 4 or 2 × 4 multi-mode interferometers, n × 2 of the present invention or 2 × 2 beam splitters
So that optical mixer bandwidth is larger, Insertion Loss is smaller for meeting.
At the same time, it is connected between input beam splitter and output beam splitter of the invention by multimode curved waveguide, it is former
Reason is: during waveguide device processing, since there are errors for local lithography and etching, necessarily leading to practical waveguide and sets
Evaluation is different, and even if the same device would also vary from the actual size that different location is worked it out, so phase
The yield rate of type device is difficult to height.But the change rate of waveguide effective index can become smaller with the increase of duct width,
Mean that the multimode waveguide of wider width has higher tolerance to fabrication error, i.e., is based on single mode waveguide compared to existing
Optical mixer, optical mixer can be made to have a biggish process allowance using multimode curved waveguide, craft precision require it is low,
High yield rate.
Preferably, shown in Figure 1, the first output end of the first input beam splitter 1 passes through multimode curved waveguide 5 and first
The first input end of output beam splitter 3 is connected, and the second output terminal of the first input beam splitter 1 passes through multimode curved waveguide 5 and the
The first input end of two output beam splitters 4 is connected；Second input beam splitter 2 the first output end by multimode curved waveguide 5 with
Second input terminal of the first output beam splitter 3 is connected, and the second output terminal of the second input beam splitter 2 passes through multimode curved waveguide 5
It is connected with the second input terminal of the second output beam splitter 4.
Preferably, the structure of all multimode curved waveguides 5 is identical, in order to realize to the basic mode for entering multimode curved waveguide 5
Light forms the outgoing of basic mode light in 5 exit of multimode curved waveguide, and the present invention has carried out following 6 kinds of designs to multimode curved waveguide 5:
(1) shown in Figure 2, the center of circle of the inner sidewall circular arc (i.e. the smaller 1 side circular arc of chord length) of multimode curved waveguide 5 and outer
The center of circle of side wa ll circle arc (i.e. the larger 1 side circular arc of chord length) is located at different location；Basic mode light can be made to enter multimode bending in this way
Multiple-mode interfence is generated after waveguide 5, and forms the outgoing of basic mode light again in exit, and the waveguide suitable for multimode curved waveguide 5 is wide
Spend the longer scene of centerline length.
(2) shown in Figure 3, the inner sidewall of multimode curved waveguide 5, with output end section or input end section in essentially
45 ° of angle；The lateral wall of multimode curved waveguide 5 parallel with inner sidewall (is also in base with output end section or input end section
This angle for being 45 °).
(3) inner sidewall of multimode curved waveguide 5 is more with output end section or input end section in the angle for being essentially 45 °
The lateral wall of mould curved waveguide 5 is arc-shaped.
(4) lateral wall of multimode curved waveguide 5 is more with output end section or input end section in the angle for being essentially 45 °
The inner sidewall of mould curved waveguide 5 is arc-shaped.
(5) outboard sidewalls of multimode curved waveguide 5 are arc-shaped, and internal diameter is smaller, and outer diameter is larger.
Design (2), (3), (4) and (5) generates reflection, Jin Er after basic mode light can be made to enter multimode curved waveguide 5
Exit forms the outgoing of basic mode light, the scene shorter suitable for the duct width centerline length of multimode curved waveguide 5 again.
(6) shown in Figure 4, the bending radius of 5 width centreline of multimode curved waveguide is along input terminal into waveguide bend
The direction of the heart is gradually reduced, and the direction along waveguide bend center to output end is gradually increased, i.e. waveguide input terminal and output end
Bending radius is (Rmax) all the same and maximum, and the bending radius at waveguide bend center is minimum (Rmin), can form Europe in this way
Curved is drawn, i.e. basic mode light can maintain basic mode to transmit after entering multimode curved waveguide 5, and then maintain in exit with basic mode
Light outgoing.
Preferably, in order to realize that the phase difference of emergent light of 2 output ends of 1 input beam splitter is essentially pi/2, referring to
Shown in Fig. 1,2 input beam splitters are respectively 1 × 2 beam splitter (the first input beam splitter 1) and (the second input point of 2 × 2 beam splitters
Beam device 2), the phase difference of the emergent light of 2 output ends of 2 × 2 beam splitters is essentially pi/2.
Preferably, in order to increase the stability of optical transport, shown in Figure 1,2 ends of every section of multimode curved waveguide 5 (connect
The place of connecing) it is provided with straight wave guide 6 (i.e. multimode curved waveguide 5 is connected by straight wave guide 6 with other component).
Preferably, the stability of optical transport in order to further increase, it is shown in Figure 1, each input beam splitter it is all
In place of input terminal and in place of all output ends of each output beam splitter, it is also equipped with straight wave guide 6.
Preferably, multi-mode interferometer or directional coupler can be selected in each input beam splitter and output beam splitter.
Further, the present invention is not limited to the above-described embodiments, for those skilled in the art,
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the present invention
Protection scope within.The content being not described in detail in this specification belongs to existing skill well known to professional and technical personnel in the field
Art.
Claims (10)
1. a kind of optical mixer, including 2 input beam splitters and 2 output beam splitters；It is characterized by:
2 input beam splitters are the beam splitter of n × 2, and the first input beam splitter (1) is used for: after being split to signal light, by more
Mould curved waveguide (5) is transmitted separately to 2 output beam splitters, and the second input beam splitter (2) is used for: being split to local oscillator light
Afterwards, 2 output beam splitters are transmitted separately to by multimode curved waveguide (5)；
Multimode curved waveguide (5) is used for: to the basic mode light into multimode curved waveguide (5) in multimode curved waveguide (5) exit
Form the outgoing of basic mode light；
2 output beam splitters are 2 × 2 beam splitters, and the first output beam splitter (3) and the second output beam splitter (4) are used to: being connect
The basic mode light of multimode curved waveguide (5) output is received, and exports basic mode light.
2. optical mixer as described in claim 1, it is characterised in that: the first output of first input beam splitter (1)
End is connected by multimode curved waveguide (5) with the first input end of the first output beam splitter (3), the first input beam splitter (1)
Second output terminal is connected by multimode curved waveguide (5) with the first input end of the second output beam splitter (4)；Second input
First output end of beam splitter (2) is connected by multimode curved waveguide (5) with the second input terminal of the first output beam splitter (3),
The second input that the second output terminal of second input beam splitter (2) passes through multimode curved waveguide (5) and the second output beam splitter (4)
End is connected.
3. optical mixer as described in claim 1, it is characterised in that: the inner sidewall circular arc of the multimode curved waveguide (5)
The center of circle and the center of circle of lateral wall circular arc be located at different location.
4. optical mixer as described in claim 1, it is characterised in that: the inner sidewall of the multimode curved waveguide (5), and it is defeated
End section or input end section are in the angle for being essentially 45 ° out；The lateral wall of multimode curved waveguide (5) is parallel with inner sidewall.
5. optical mixer as described in claim 1, it is characterised in that: the multimode curved waveguide (5) inner sidewall and
In lateral wall, wherein 1 side wall and output end section or input end section are in essentially 45 ° of angle, another 1 side wall is in arc
Shape.
6. optical mixer as described in claim 1, it is characterised in that: multimode curved waveguide (5) width centreline
Bending radius is gradually reduced along the direction at input terminal to waveguide bend center, along waveguide bend center to output end direction gradually
Increase.
7. such as optical mixer as claimed in any one of claims 1 to 6, it is characterised in that: 2 input beam splitters are respectively 1 × 2
Beam splitter and 2 × 2 beam splitters.
8. such as optical mixer as claimed in any one of claims 1 to 6, it is characterised in that: the 2 of every section of multimode curved waveguide (5)
End is provided with straight wave guide (6).
9. such as optical mixer as claimed in any one of claims 1 to 6, it is characterised in that: each to input all defeated of beam splitter
In place of all output ends for entering end place and each output beam splitter, it is provided with straight wave guide (6).
10. such as optical mixer as claimed in any one of claims 1 to 6, it is characterised in that: each input beam splitter and output point
Multi-mode interferometer or directional coupler can be selected in beam device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811422079.1A CN109375316A (en) | 2018-11-27 | 2018-11-27 | A kind of optical mixer |
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| CN201811422079.1A CN109375316A (en) | 2018-11-27 | 2018-11-27 | A kind of optical mixer |
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| CN109375316A true CN109375316A (en) | 2019-02-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021060482A (en) * | 2019-10-04 | 2021-04-15 | 富士通株式会社 | Optical semiconductor element and receiver |
| CN114594554A (en) * | 2020-12-04 | 2022-06-07 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN115144964A (en) * | 2022-07-20 | 2022-10-04 | 浙江大学 | Silicon-based array waveguide grating based on Euler bending wide waveguide |
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| CN106019483A (en) * | 2016-07-29 | 2016-10-12 | 东南大学 | Optical mixer without polarization state diversity |
| US10126498B1 (en) * | 2017-07-25 | 2018-11-13 | Elenion Technologies, Llc | Optical hybrid |
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| CN101114886A (en) * | 2007-08-30 | 2008-01-30 | 北京交通大学 | Polarization type optical caching device and regulating method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20190222 |