CN106950727B - The microwave photon circulator of high-isolation - Google Patents
The microwave photon circulator of high-isolation Download PDFInfo
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- CN106950727B CN106950727B CN201710281808.5A CN201710281808A CN106950727B CN 106950727 B CN106950727 B CN 106950727B CN 201710281808 A CN201710281808 A CN 201710281808A CN 106950727 B CN106950727 B CN 106950727B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0316—Electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/50—Phase-only modulation
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- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The invention discloses a kind of microwave photon circulator of high-isolation, the microwave photon circulator is made of laser, the unidirectional phase-modulator of lithium niobate, three port microwave circulators, impedance matching unit, phase-demodulation unit, photodetector and microwave amplifier；The method have the benefit that: a kind of microwave photon circulator of high-isolation is provided, which can obtain higher receive-transmit isolation under the conditions of wider bandwidth of operation.
Description
Technical field
The present invention relates to a kind of a kind of microwave photon of communication system transmit-receive duplex technology more particularly to high-isolation annulars
Device.
Background technique
Transmission duplex function is one of critical function of communication system, when embodying in practical applications, that is, requires communication system
Powerful transmitting signal can be fed to the small-signal that antenna is sent out but also receives antenna and is coupled by system
Come；To realize foregoing purpose, it is necessary to which related device, can be uninterruptedly to faint letter while emitting high-power signal
It number is received, namely requires communication system that there is preferable receive-transmit isolation, if receive-transmit isolation is not good enough, the letter of transmitting
It number seals in receiving channel, it is possible to will increase the bit error rate for receiving signal, influence the working performance of entire communication system.
In the prior art, the device for realizing transmission duplex function is mainly based upon the microwave circulators of electronic technology,
This device be using made of ferrite gyromagnetic material, when microwave signal passes through gyromagnetic material, can in gyromagnetic material
There is sufficient interaction between spinning electron, will appear tensor permeability under the induction in applied bias magnetic field, to occur
The phenomenon that plane of polarization rotates generates gyromagnetic effect and anisotropic；The microwave circulators produced under the conditions of the prior art every
Limited from degree index, usually in 20dB or so, and existing microwave circulators are difficult to obtain under the conditions of wider bandwidth of operation
Higher receive-transmit isolation index is unable to satisfy the engineering circles application demand increasingly harsh to communication system.
Summary of the invention
For the problems in background technique, the invention proposes a kind of microwave photon circulator of high-isolation, innovations
Be: the microwave photon circulator is by laser, the unidirectional phase-modulator of lithium niobate, three port microwave circulators, impedance
It is formed with unit, phase-demodulation unit, photodetector and microwave amplifier；
The unidirectional phase-modulator of lithium niobate includes substrate, slab waveguide and traveling wave electrode, the slab waveguide and row
Wave electrode is both formed in substrate, and slab waveguide is passed through from the modulation areas on traveling wave electrode；Two ends of the traveling wave electrode
Mouth is denoted as the port A and the port B respectively, wherein the input terminal of the port A and slab waveguide is respectively positioned on the left side of substrate, the port B and item
The output end of shape waveguide is respectively positioned on the right side of substrate；
The output end of the laser and the input terminal of slab waveguide connect, the output end and phase demodulating list of slab waveguide
The input terminal connection of member；The port A forms the signal transmitting and receiving end of microwave photon circulator, the port B and three port microwaves
The transmitting-receiving multiplexing end connection of circulator；
The input terminal of the output end of the phase-demodulation unit and photodetector connects, the output end of photodetector with
The input terminal of microwave amplifier connects, and the output end of microwave amplifier forms the reception signal output end of microwave photon circulator；
The input terminal of three port microwave circulators forms the transmitting signal input part of microwave photon circulator, three ports
The output end of microwave circulators is connect with impedance matching unit.
When specifically used, the signal transmitting and receiving end of microwave photon circulator is connect with antenna, the transmitting of microwave photon circulator
Signal input part is connect with pre-procesor, and the reception signal output end and rear class processing unit of microwave photon circulator connect
It connects；The principle of the present invention is:
In the device course of work, laser provides continuous light carrier for the unidirectional phase-modulator of lithium niobate, based on existing
It is theoretical it is found that the unidirectional phase-modulator based on lithium columbate crystal can utilize the electrooptic effect of lithium columbate crystal, by row
Wave electrode applies microwave signal to be modulated to the phase of the optical signal in optical waveguide, but this modulating action is only in microwave
Field transmission direction could work under the same conditions with light wave transmissions direction in optical waveguide, when microwave field transmission direction and optical waveguide
When middle light wave transmissions are contrary, the phase velocity mismatch of microwave field and light field is serious, at this moment microwave signal just can not to light wave into
The effective modulation of row, define in aforementioned schemes " input terminal of the port A and slab waveguide is respectively positioned on the left side of substrate, the port B and
The output end of slab waveguide is respectively positioned on the right side of substrate " and " output end of laser and the input terminal of slab waveguide connect ",
Typical structure in conjunction with the unidirectional phase-modulator of lithium niobate is micro- it is found that in the unidirectional phase-modulator of lithium niobate of the invention
When wave signal only enters from the port A, corresponding microwave field transmission direction is just identical as light wave transmissions direction, when microwave signal from
When the port B enters, corresponding microwave field transmission direction is contrary with light wave transmissions, in other words, only enters from the port A
Microwave signal could play modulating action to the light carrier of laser output in the unidirectional phase-modulator of lithium niobate, from the port B
The microwave signal of entrance cannot play effective modulation to the light carrier of laser output in the unidirectional phase-modulator of lithium niobate
Effect；
In the course of work, when needing to be sent out signal, transmitting is passed through by the transmitting signal that pre-procesor generates
Signal input part enters three port microwave circulators in microwave photon circulator, and three port microwave circulators will emit signal and pass
It transports to the port B, emits signal after traveling wave electrode transmits by signal transmitting and receiving end (i.e. the port A) output to antenna and to outgoing
It send, in the process, transmitting signal will not play modulating action to light wave；When receiving signal, small-signal that antenna receives
Enter traveling wave electrode by signal transmitting and receiving end (i.e. the port A), the small-signal for entering traveling wave electrode will play light carrier
Modulating action, so that the output end of slab waveguide be enable to export modulated optical signal, phase-demodulation unit is to slab waveguide
The optical signal of output carries out demodulation process, then carries out photoelectric conversion and enhanced processing by photodetector and microwave amplifier,
Rear class processing unit is eventually transferred to be handled；
Three port microwave circulators in the present invention are traditional microwave circulator described in background technology, and effect is to use
In connection impedance matching unit and the port B and for connecting the port B and pre-procesor, this three port microwave circulators
Receive-transmit isolation it is poor, but due to the unidirectional modulating characteristic of the unidirectional phase-modulator of lithium niobate, when being sent out signal, into
The transmitting signal for entering three port microwave circulators can be only crosstalked on impedance matching unit, will not be impacted to light carrier；When
When receiving signal, the small-signal received can be entered in impedance matching unit by three port microwave circulators, impedance
With unit impedance matching can be adaptively carried out according to small-signal.
For the linearity for improving receives link, the invention also provides following preferred embodiments: the phase-demodulation unit
It is made of optical splitter, the first optical filter and the second optical filter；The optical splitter is single-input double-output mode, light point
The splitting ratio of two output ends of road device is 1 to 1；The output end of slab waveguide and the input terminal of optical splitter connect, optical branching
One of output end of device is connect with the input terminal of the first optical filter, and the another output of optical splitter and the second light are filtered
The input terminal of wave device connects；One of first optical filter and the second optical filter can carry out just the optical signal of input
The linear filtering of slope is handled, and the linear filtering that another one can carry out negative slope to the optical signal of input is handled；The photoelectricity is visited
Survey the balanced detector that device uses the output of dual input list, one of them of the output end of the first optical filter and balanced detector are defeated
Enter end connection, the output end of the second optical filter and another input terminal of balanced detector connect, the output of balanced detector
End is connect with the input terminal of microwave amplifier.After photodetector uses balanced detector, it can preferably inhibit output signal
Common-mode noise.
Preferably, first optical filter and the second optical filter are cascaded by multiple time delay interferometers, each
The splitting ratio of time delay interferometer is different.
The method have the benefit that: provide a kind of microwave photon circulator of high-isolation, the microwave photon
Circulator can obtain higher receive-transmit isolation under the conditions of wider bandwidth of operation.
Detailed description of the invention
The connection relationship diagram of Fig. 1, the present invention and peripheral unit；
The preferred embodiment structural schematic diagram of Fig. 2, phase-demodulation unit；
It is micro- to be respectively as follows: the unidirectional phase-modulator 2 of laser 1, lithium niobate, three ports for title corresponding to each label in figure
Wave circulator 3, impedance matching unit 4, phase-demodulation unit 5, optical splitter 5-1, the first optical filter 5-2, the filtering of the second light
Device 5-3, photodetector 6, microwave amplifier 7, pre-procesor 8, rear class processing unit 9, antenna 10, the port the A port A, B
B。
Specific embodiment
A kind of microwave photon circulator of high-isolation, innovation be: the microwave photon circulator by laser 1,
The unidirectional phase-modulator 2 of lithium niobate, three port microwave circulators 3, impedance matching unit 4, phase-demodulation unit 5, photodetection
Device 6 and microwave amplifier 7 form；
The unidirectional phase-modulator 2 of lithium niobate includes substrate, slab waveguide and traveling wave electrode, the slab waveguide and row
Wave electrode is both formed in substrate, and slab waveguide is passed through from the modulation areas on traveling wave electrode；Two ends of the traveling wave electrode
Mouth is denoted as the port A and the port B respectively, wherein the input terminal of the port A and slab waveguide is respectively positioned on the left side of substrate, the port B and item
The output end of shape waveguide is respectively positioned on the right side of substrate；
The output end of the laser 1 and the input terminal of slab waveguide connect, the output end of slab waveguide and phase demodulating
The input terminal of unit 5 connects；The port A forms the signal transmitting and receiving end of microwave photon circulator, and the port B and three ports are micro-
The transmitting-receiving multiplexing end connection of wave circulator 3；
The output end of the phase-demodulation unit 5 is connect with the input terminal of photodetector 6, the output of photodetector 6
End is connect with the input terminal of microwave amplifier 7, and the reception signal that the output end of microwave amplifier 7 forms microwave photon circulator is defeated
Outlet；
The input terminal of three port microwave circulators 3 forms the transmitting signal input part of microwave photon circulator, three ends
The output end of mouth microwave circulators 3 is connect with impedance matching unit 4.
Further, the phase-demodulation unit 5 is by optical splitter 5-1, the first optical filter 5-2 and the second optical filter
5-3 composition；The optical splitter 5-1 is single-input double-output mode, and the splitting ratio of two output ends of optical splitter 5-1 is 1
Than 1；The output end of slab waveguide is connect with the input terminal of optical splitter 5-1, one of output end of optical splitter 5-1 and
The input terminal of one optical filter 5-2 connects, the input terminal of the another output of optical splitter 5-1 and the second optical filter 5-3
Connection；One of the first optical filter 5-2 and the second optical filter 5-3 can carry out positive slope to the optical signal of input
Linear filtering processing, the linear filtering that another one can carry out negative slope to the optical signal of input are handled；
The photodetector 6 using the output of dual input list balanced detector, the output end of the first optical filter 5-2 with
One of input terminal of balanced detector connects, and another of the output end of the second optical filter 5-3 and balanced detector are defeated
Enter end connection, the output end of balanced detector is connect with the input terminal of microwave amplifier 7.
Further, the first optical filter 5-2 and the second optical filter 5-3 cascaded by multiple time delay interferometers and
At the splitting ratio of each time delay interferometer is different.
Claims (3)
1. a kind of microwave photon circulator of high-isolation, it is characterised in that: the microwave photon circulator by laser (1),
The unidirectional phase-modulator of lithium niobate (2), three port microwave circulators (3), impedance matching unit (4), phase-demodulation unit (5),
Photodetector (6) and microwave amplifier (7) composition；
The unidirectional phase-modulator of lithium niobate (2) includes substrate, slab waveguide and traveling wave electrode, the slab waveguide and traveling wave
Electrode is both formed in substrate, and slab waveguide is passed through from the modulation areas on traveling wave electrode；Two ports of the traveling wave electrode
It is denoted as the port A and the port B respectively, wherein the input terminal of the port A and slab waveguide is respectively positioned on the left side of substrate, the port B and bar shaped
The output end of waveguide is respectively positioned on the right side of substrate；
The output end of the laser (1) and the input terminal of slab waveguide connect, the output end and phase demodulating list of slab waveguide
The input terminal connection of first (5)；The port A forms the signal transmitting and receiving end of microwave photon circulator, and the port B and three ports are micro-
The transmitting-receiving multiplexing end connection of wave circulator (3)；
The output end of the phase-demodulation unit (5) is connect with the input terminal of photodetector (6), photodetector (6) it is defeated
Outlet is connect with the input terminal of microwave amplifier (7), and the output end of microwave amplifier (7) forms the reception of microwave photon circulator
Signal output end；
The input terminal of three port microwave circulators (3) forms the transmitting signal input part of microwave photon circulator, three ports
The output end of microwave circulators (3) is connect with impedance matching unit (4).
2. the microwave photon circulator of high-isolation according to claim 1, it is characterised in that: the phase-demodulation unit
(5) it is made of optical splitter (5-1), the first optical filter (5-2) and the second optical filter (5-3)；The optical splitter (5-1)
For single-input double-output mode, the splitting ratio of two output ends of optical splitter (5-1) is 1 to 1；The output end of slab waveguide with
The input terminal of optical splitter (5-1) connects, one of output end of optical splitter (5-1) and the first optical filter (5-2)
Input terminal connection, the another output of optical splitter (5-1) are connect with the input terminal of the second optical filter (5-3)；Described
One of one optical filter (5-2) and the second optical filter (5-3) can carry out the linear filter of positive slope to the optical signal of input
Wave processing, the linear filtering that another one can carry out negative slope to the optical signal of input are handled；
The photodetector (6) use dual input list output balanced detector, the output end of the first optical filter (5-2) with
One of input terminal of balanced detector connects, the output end of the second optical filter (5-3) and balanced detector another
Input terminal connection, the output end of balanced detector are connect with the input terminal of microwave amplifier (7).
3. the microwave photon circulator of high-isolation according to claim 2, it is characterised in that: first optical filter
(5-2) and the second optical filter (5-3) are cascaded by multiple time delay interferometers, and the splitting ratio of each time delay interferometer is respectively not
It is identical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710281808.5A CN106950727B (en) | 2017-04-26 | 2017-04-26 | The microwave photon circulator of high-isolation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710281808.5A CN106950727B (en) | 2017-04-26 | 2017-04-26 | The microwave photon circulator of high-isolation |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278941A (en) * | 2013-06-14 | 2013-09-04 | 哈尔滨工业大学 | Microwave photonic filter based on stimulated Brillouin scattering dynamic grating, and filtering method thereof |
| CN105607302A (en) * | 2016-03-21 | 2016-05-25 | 中国科学院半导体研究所 | Tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9543627B2 (en) * | 2013-11-19 | 2017-01-10 | Electronics And Telecommunications Research Institute | Microwave device using magnetic material nano wire array and manufacturing method thereof |
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- 2017-04-26 CN CN201710281808.5A patent/CN106950727B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278941A (en) * | 2013-06-14 | 2013-09-04 | 哈尔滨工业大学 | Microwave photonic filter based on stimulated Brillouin scattering dynamic grating, and filtering method thereof |
| CN105607302A (en) * | 2016-03-21 | 2016-05-25 | 中国科学院半导体研究所 | Tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery |
Non-Patent Citations (3)
| Title |
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| Circulators for Microwave and Millimeter-Wave Integrated Circuits;ERNST F.SCHLOEMANN;《PROCEEDINGS OF THE IEEE》;19880201;全文 |
| Feedforward Embedding Circulator Enhancement in Transmit/Receive Applications;S.L.Karode and V.F.Fusco;《IEEE MICROWAVE AND GUIDED WAVE LETTERS》;19980101;全文 |
| On-Chip Superconducting Microwave Circulator from Synthetic Rotation;Joseph Kerckhoff等;《PHYSICAL REVIEW APPLIED》;20150910;全文 |
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