CN116107102A - Low-power consumption differential modulator and optical chip - Google Patents
Low-power consumption differential modulator and optical chip Download PDFInfo
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- CN116107102A CN116107102A CN202310350296.9A CN202310350296A CN116107102A CN 116107102 A CN116107102 A CN 116107102A CN 202310350296 A CN202310350296 A CN 202310350296A CN 116107102 A CN116107102 A CN 116107102A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000006978 adaptation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
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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
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
- G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
-
- 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
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to the technical field of optical chips, in particular to a low-power-consumption differential modulator and an optical chip, which comprise the following components: a first bias voltage link and a second bias voltage link arranged side by side, a driver (20) and a termination resistor (50); the first bias voltage link comprises a first signal output port (31), a first row wave electrode (41), a first inductor (61) and a first bias electrode (71) which are sequentially connected and arranged; the second bias voltage link comprises a second signal output port (32), a second traveling wave electrode (42), a second inductor (62) and a second bias electrode (72) which are sequentially connected and arranged; the first signal output port (31) and the second signal output port (32) are respectively connected with the driver (20); one end of the termination resistor (50) is electrically coupled with the first traveling wave electrode (41), and the other end of the termination resistor is electrically coupled with the second traveling wave electrode (42). The differential modulator provided by the invention has lower power consumption and better performance effect.
Description
Technical Field
The invention relates to the technical field of optical chips, in particular to a low-power-consumption differential modulator and an optical chip.
Background
In the technical field of high-speed optical communication, a travelling wave electrode Mach-Zehnder modulator is often adopted to realize rapid photoelectric conversion, and the travelling wave electrode Mach-Zehnder modulator is widely applied to the current silicon-based modulator and the III-V modulator. Meanwhile, the Mach-Zehnder modulator has the advantages of large optical bandwidth, insensitivity to temperature and the like. While traveling wave electrode Mach-Zehnder modulators can be generally classified into two types, single-ended drive modulators and differential drive modulators. Compared with a single-end driving modulator, the differential driving modulator has the advantages of strong anti-interference capability, large output signal amplitude and the like, and is a main development direction of the future driving modulator. While the existing differential drive modulator generally applies bias voltages to the modulator chip, such as path termination resistors, traveling wave electrodes, etc., to ultimately act on the driver chip, the bias voltages applied to the termination resistors will generate greater power consumption. If bias voltages are not applied to the termination resistor and the traveling wave electrode resistor have deviations, the voltage values applied to the driving chips are not equal, and the performance of the differential driving chip driving modulator is affected.
Disclosure of Invention
Aiming at the technical problems that the existing differential modulator has high power consumption and the performance is easy to be influenced by voltage, the invention provides the low-power-consumption differential modulator and the optical chip, which have the advantages of lower power consumption and better performance effect.
First aspect
The invention provides a low-power consumption differential modulator, comprising: the first bias voltage link, the second bias voltage link, the driver and the terminal resistor are arranged side by side;
the first bias voltage link comprises a first signal output port, a first traveling wave electrode, a first inductor and a first bias electrode which are sequentially connected; the second bias voltage link comprises a second signal output port, a second traveling wave electrode, a second inductor and a second bias electrode which are sequentially connected and arranged;
the first signal output port and the second signal output port are respectively connected with the driver;
one end of the terminal resistor is electrically connected with the first traveling wave electrode, and the other end of the terminal resistor is electrically connected with the second traveling wave electrode.
Specifically, the primary concept of the invention is to adjust the connection structure of the differential modulator circuit according to the purpose of the termination resistor, so as to reduce the overall operation power consumption of the modulator under the condition of ensuring the function of the device. One aspect of the concept is that two ends of the terminal resistor are respectively connected with the first traveling wave resistor and the second traveling wave resistor to form a radio frequency loop; the other aspect of the conception is that the voltage applied to the two ends of the terminal resistor is basically the same through the structural design of the differential modulator, so that the bias voltage cannot pass through the terminal resistor to generate additional power loss, and the terminal resistor of the low-power-consumption differential modulator provided by the invention can greatly reduce the power loss while realizing the function of a radio frequency loop. In addition, the first inductor and the second inductor have the function of blocking radio frequency signal leakage, so that the power consumption of the whole differential modulator is reduced, and meanwhile, the strength of the radio frequency signal can be ensured.
Further, a first bias voltage V1 and a second bias voltage V2 are applied through the first bias electrode and the second bias electrode, respectively.
Specifically, the invention applies the first bias voltage V through the first bias electrode 1 And a second bias voltage V applied by the second bias electrode 2 Acts on the first signal output port and the second signal output port of the driver respectively, thereby realizing voltage bias to the driver. At the same time, the first bias voltage V 1 And a second bias voltage V 2 And also for powering the drive.
Further, the overall resistance R of the first bias voltage link 1 An overall resistance value R of the second bias voltage link 2 The relationship exists: v (V) 1 /R 1 =V 2 /R 2 。
Specifically, according to the inventive concept presented in the foregoing of the present invention, the first bias voltage V 1 And a second bias voltage V 2 The voltages across the termination resistor should be substantially uniform, thereby ensuring a first bias voltage V 1 And a second bias voltage V 2 And in the working process, the terminal resistor is not needed, so that the device efficiency is improved. In an ideal state, the first signal output port, the first traveling wave electrode, the first inductor, the corresponding second signal output port and the second traveling wave electricity in the first bias voltage link provided by the inventionThe pole and the second inductor are the same component. Thus, in an ideal state, the first bias voltage V 1 =second bias voltage V 2 Because the theoretical resistance values of the same device are the same, the voltage drop of the first bias voltage link at the terminal resistor end is the same as the voltage drop of the second bias voltage link at the terminal resistor end, and further, the bias voltage is ensured not to generate power consumption at the terminal resistor. It is easy to understand that V 1 /R 1 =V 2 /R 2 For balancing the bias voltage applied by the driver and the bias voltage applied by the termination resistor. In the working process of the low-power consumption differential modulator provided by the invention, the integral resistance R of the first bias voltage link is influenced by factors such as process, operation working condition and the like 1 And the overall resistance value R of the second bias voltage link 2 Not entirely in agreement with the theoretical values. Thus, the invention establishes V 1 /R 1 =V 2 /R 2 Is the integral resistance R of the first bias voltage link 1 And the overall resistance value R of the second bias voltage link 2 In the case of a difference, the first bias voltage V 1 And a second bias voltage V 2 Will be according to R 1 And R is 2 The voltage value of the first bias electrode finally applied to the first signal output port and the voltage value of the second bias electrode finally applied to the second signal output port are adjusted within a controllable range, so that the function of the low-power-consumption differential modulator provided by the invention is ensured.
Further, characteristic impedance of the driver, the first traveling wave electrode, the second traveling wave electrode and the termination resistor are matched.
Specifically, the characteristic impedance is also called characteristic impedance, and by matching the characteristic impedance of the driver, the first traveling wave electrode, the second traveling wave electrode and the terminal resistor, the high-frequency signal does not generate impedance discontinuity or node reflection problem in a radio frequency loop formed by the first signal output port, the first traveling wave electrode, the terminal resistor and the second signal output port of the second traveling wave electrode, so that the performance of the differential modulator is improved.
Further, the overall resistance R of the first bias voltage link 1 Is equal to the whole resistance R of the second bias voltage link 2 。
Specifically, as a preferred embodiment, the overall resistance R of the first bias voltage link 1 The overall resistance value R of the second bias voltage link 2 I.e. first bias voltage V 1 =second bias voltage V 2 Therefore, no bias voltage is applied to the two ends of the terminal resistor, and the power consumption of the differential modulator provided by the invention is minimum.
Further, the driver has a voltage monitoring function.
Specifically, according to relation V 1 /R 1 =V 2 /R 2 The bias voltages ultimately applied at the driver first and second signal output ports should meet the expectations. Therefore, the driver also has a voltage monitoring function.
Further, when the bias voltage finally applied to the driver does not meet the practical requirement, feedback is performed so as to apply the first bias voltage V to the first bias electrode and/or the second bias electrode 1 And/or a second bias voltage V 2 And (5) adjusting.
Further, the differential modulator further comprises a voltage input end, and the voltage input end is respectively connected with the first bias electrode and the second bias electrode.
In particular, the invention can make the first bias voltage V by the action of the voltage input end 1 And a second bias voltage V 2 The consistency is achieved, and the performance of the differential modulator is improved.
In some embodiments, the differential modulator is a silicon-based modulator or a III-V modulator.
Further, the first signal output port and the first traveling wave electrode and the second signal output port and the second traveling wave electrode are connected through metal wire bonding or chip reverse bonding.
In a second aspect, the present invention provides an optical chip comprising any one of the low power differential modulators provided in the first aspect.
In summary, the differential modulator and the optical chip provided by the invention have at least the following advantages that 1, through the optimization of the structure of the differential modulator, the structure of the termination resistor can be simplified, and the power consumption of the differential modulator can be greatly reduced while the dual-channel radio frequency loop is realized; 2. the performance and the power consumption of the differential modulator can be effectively balanced through the adaptation of the bias voltage and the overall resistance of the bias voltage link; 3. through the use of the detector and the packaging technology, the risk resistance of the differential modulator can be further improved, and the service life is longer.
Drawings
The invention will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the invention. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.
FIG. 1 is a schematic diagram of a prior art differential modulator;
FIG. 2 is a schematic diagram of a differential modulator according to an embodiment of the present invention;
10. a driver signal input; 20. a driver; 31. a first signal output port; 32. a second signal output port; 41. a first row wave electrode; 42. a second traveling wave electrode; 50. a termination resistor; 51. a first contrast resistance; 52. a second contrast resistor; 60. comparing the inductances; 61. a first inductance; 62. a second inductor; 70. a contrast electrode; 71. a first bias electrode; 72. and a second bias electrode.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 2.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to make the technical point of the present invention easier to understand, the prior art of the present invention will be explained with reference to fig. 1. In the prior art the bias voltage is applied through the counter electrode 70, whereas the first traveling wave electrode 41, the first counter resistor 51, the second counter resistor 52 and the second traveling wave electrode 42 form a radio frequency loop. Meanwhile, the comparative inductor 60 is used to prevent leakage of the radio frequency signal. However, since the bias voltage passes through the first resistor 51 and the second resistor 52 at the same time, additional power loss is generated, and heat dissipation is also generated, which affects the device performance.
Referring to fig. 2, a schematic structure of a differential modulator according to an embodiment of the invention shown in fig. 2 is shown.
Specifically, one of the primary conception points of the differential modulator provided by the present invention is to improve the termination resistor 50, and it can be seen from fig. 1 that two ends of the termination resistor 50 are respectively connected to the first traveling wave electrode 41 and the second traveling wave electrode 42, and the first traveling wave electrode 41 and the second traveling wave electrode 42 respectively implement signal input through the first signal output port 31 and the second signal output port 32, and the first signal output port 31 and the second signal output port 32 are connected to the driver 20, and the driver 20 obtains signal input through the driver signal input port 10. The signal input ports of the two external drivers 20 adopt a double-end input mode and respectively correspond to the first traveling wave electrode 41 and the second traveling wave electrode 42, so that the first traveling wave electrode 41, the terminal resistor 50 and the second traveling wave electrode 42 form a radio frequency loop. Referring to fig. 2, when the bias voltage is applied to the first bias voltage link and the second bias voltage link, the bias voltage does not pass through the termination resistor 50 and generate additional consumption, and the bias voltage applied by the prior art must pass through the first comparison resistor 51 and the second comparison resistor 52 and generate additional consumption and additional heat generation, compared to the prior art, because the voltage difference across the termination resistor 50 is substantially 0.
In some embodiments, the present invention further provides a difference compared to the prior art, in that the present invention improves the prior art double-ended input single-ended output differential circuit into a double-ended input double-ended output differential circuit, and the present invention provides a double-ended output, namely, the comparison inductor 60 and the comparison electrode 70 at the single-ended output of fig. 2, the first inductor 61 and the first bias electrode 71 connected at the first traveling wave electrode 41, and the second inductor 62 and the second bias electrode 72 connected at the second traveling wave electrode 42, so that the performance of the differential modulator provided by the present invention is better.
Further, the characteristic impedances of the driver 20, the first traveling wave electrode 41, the second traveling wave electrode 42 and the termination resistor 50 are matched, so that the high-frequency signal does not generate the problem of discontinuous impedance or node reflection in the radio frequency loop formed by the first signal output port 31, the first traveling wave electrode 41, the termination resistor 50 and the second signal output port 32 of the second traveling wave electrode 42, thereby improving the performance of the differential modulator.
In some embodiments, the overall resistance value r1=the overall resistance value R2 of the first bias voltage link, that is, the first bias voltage v1=the second bias voltage V2, so that no bias voltage is applied to the two ends of the termination resistor 50, and therefore, the differential modulator provided by the invention has the lowest power consumption.
Further, according to the relationship V1/r1=v2/R2, the bias voltages finally applied at the first signal output port 31 and the second signal output port 32 of the driver 20 should meet expectations. Therefore, the driver also has a voltage monitoring function. When the bias voltage finally applied to the driver does not meet the practical requirement, feedback is performed so as to apply a first bias voltage V to the first bias electrode and/or the second bias electrode 1 And/or a second bias voltage V 2 And (5) adjusting.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present invention may be better understood. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. A low power differential modulator, comprising: a first bias voltage link and a second bias voltage link arranged side by side, a driver (20) and a termination resistor (50);
the first bias voltage link comprises a first signal output port (31), a first row wave electrode (41), a first inductor (61) and a first bias electrode (71) which are sequentially connected and arranged; the second bias voltage link comprises a second signal output port (32), a second traveling wave electrode (42), a second inductor (62) and a second bias electrode (72) which are sequentially connected and arranged;
the first signal output port (31) and the second signal output port (32) are respectively connected with the driver (20);
one end of the termination resistor (50) is electrically coupled with the first traveling wave electrode (41), and the other end of the termination resistor is electrically coupled with the second traveling wave electrode (42).
2. A low power differential modulator as claimed in claim 1, characterized in that a first bias voltage V1 and a second bias voltage V2 are applied via said first bias electrode (71) and second bias electrode (72), respectively.
3. The low power differential modulator of claim 2, wherein the overall resistance R1 of the first bias voltage link is related to the overall resistance R2 of the second bias voltage link: v1/r1=v2/R2.
4. A low power differential modulator according to claim 3, characterized in that the characteristic impedance of the driver (20), the first traveling wave electrode (41), the second traveling wave electrode (42) and the termination resistor (50) are matched.
5. A low power differential modulator as claimed in claim 3, wherein the overall resistance R1 of said first bias voltage link is equal to the overall resistance R2 of said second bias voltage link.
6. A low power differential modulator according to claim 1, characterized in that the driver (20) is provided with a voltage monitoring function.
7. A low power differential modulator as claimed in claim 1, characterized in that said differential modulator further comprises a voltage input connected to said first (71) and second (72) bias electrodes, respectively.
8. The low power differential modulator of claim 1, wherein the differential modulator is a silicon-based modulator or a group iii-v modulator.
9. A low power differential modulator according to claim 1, characterized in that the first signal output port (31) and the first traveling wave electrode (41) and the second signal output port (32) and the second traveling wave electrode (42) are connected by metal wire bonding or die bonding.
10. An optical chip comprising a low power differential modulator as claimed in any one of claims 1 to 9.
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| CN202310350296.9A CN116107102B (en) | 2023-04-04 | 2023-04-04 | Low-power consumption differential modulator and optical chip |
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| CN202310350296.9A CN116107102B (en) | 2023-04-04 | 2023-04-04 | Low-power consumption differential modulator and optical chip |
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