CN113259011A - Compatible circuit for changing rising and falling time of output electric signal for optical module - Google Patents
Compatible circuit for changing rising and falling time of output electric signal for optical module Download PDFInfo
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- CN113259011A CN113259011A CN202110339545.5A CN202110339545A CN113259011A CN 113259011 A CN113259011 A CN 113259011A CN 202110339545 A CN202110339545 A CN 202110339545A CN 113259011 A CN113259011 A CN 113259011A
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Abstract
The invention provides a compatible circuit for changing rising and falling time of an output electric signal for an optical module, which comprises a photodiode and a Driver driving chip, wherein the output end of the Driver driving chip is electrically connected with a mainboard, the photodiode is electrically connected with an input port corresponding to the Driver driving chip, the photodiode corresponds to a first output port and a second output port of the Driver driving chip, the first output port is electrically connected with the mainboard through a first capacitor, the second output port is electrically connected with the mainboard through a second capacitor, and when the rising and falling time of the output electric signal needs to be reduced, the output end of the first capacitor is connected with the output end of the second capacitor through a third capacitor. The invention provides a compatible circuit for changing the rising time and the falling time of an output electric signal for an optical module, which can meet the 100G CWDM4 index and the 40G LR4 index, does not need to design two PCB boards, and reduces the cost.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a compatible circuit for changing the rising and falling time of an output electric signal for an optical module.
Background
With the increase of customer requirements, the 100G CWDM4 optical module and the 40G LR4 module are more and more in demand, and the 100G CWDM4 and the 40G LR4 are consistent in wave band, so that two PCBs are respectively designed, more research and development resources are invested, and cost control and production control are not facilitated.
Therefore, it is necessary to design a compatible circuit for changing the rising and falling time of the output electrical signal for the optical module to overcome the above problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a compatible circuit for changing the rising time and the falling time of an output electric signal for an optical module, which at least solves part of problems in the prior art.
The invention is realized by the following steps:
the invention provides a compatible circuit for changing rising and falling time of an output electric signal for an optical module, which comprises a photodiode and a Driver driving chip, wherein the output end of the Driver driving chip is electrically connected with a mainboard, the photodiode is electrically connected with an input port corresponding to the Driver driving chip, the photodiode corresponds to a first output port and a second output port of the Driver driving chip, the first output port is electrically connected with the mainboard through a first capacitor, and the second output port is electrically connected with the mainboard through a second capacitor.
Preferably, when the rising and falling time of the output electric signal needs to be reduced, the output end of the first capacitor is connected with the output end of the second capacitor through a third capacitor.
Preferably, the number of the photodiodes is 4, 4 photodiodes are integrated on the chip U1, two output ports of the first photodiode corresponding to the Driver driving chip are electrically connected to the motherboard through a capacitor C1 and a capacitor C2, respectively, and when the rise and fall time of the output electrical signal needs to be reduced, the output terminal of the capacitor C1 is connected to the output terminal of the capacitor C2 through a capacitor C12;
two output ports of the second photodiode, corresponding to the Driver driving chip, are electrically connected with the mainboard through a capacitor C3 and a capacitor C4 respectively, and when the rising and falling time of an output electric signal needs to be reduced, the output end of the capacitor C3 is connected with the output end of the capacitor C4 through a capacitor C11;
two output ports of the third photodiode, corresponding to the Driver driving chip, are electrically connected with the motherboard through a capacitor C5 and a capacitor C6 respectively, and when the rising and falling time of an output electric signal needs to be reduced, the output end of the capacitor C5 is connected with the output end of the capacitor C6 through a capacitor C10;
two output ports of the fourth photodiode corresponding to the Driver driving chip are respectively electrically connected with the mainboard through a capacitor C7 and a capacitor C8, and when the rising time and the falling time of an output electric signal need to be reduced, the output end of the capacitor C7 is connected with the output end of the capacitor C8 through a capacitor C9.
The invention has the following beneficial effects:
1. the invention provides a compatible circuit for changing the rising time and the falling time of an output electric signal for an optical module, which can meet the 100G CWDM4 index and the 40G LR4 index, and does not need to design two PCB boards.
2. The invention solves the problems of multiple schemes and high cost, designs an optical module receiving end compatible scheme, and reduces design cost, production cost and the like.
3. The circuit is characterized in that a small-capacity capacitor is bridged between differential signals at the output end of a Driver, and when the rising time and the falling time of an output electric signal need to be reduced, the capacitor is welded; when the rising time and the falling time of the output electric signal need to be improved, the capacitor is not welded; in the application of the circuit in an optical module, a Driver driving chip with the same scheme can change the rising and falling time of an electric signal, so that various protocol requirements are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a compatible circuit diagram for changing rising and falling times of an output electrical signal for an optical module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the principle of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, an embodiment of the present invention provides a compatible circuit for changing a rise time and a fall time of an output electrical signal for an optical module, including a photodiode and a Driver driving chip having an output end electrically connected to a motherboard, where the photodiode is electrically connected to an input port corresponding to the Driver driving chip, the photodiode corresponds to a first output port and a second output port of the Driver driving chip, the first output port is electrically connected to the motherboard through a first capacitor, the second output port is electrically connected to the motherboard through a second capacitor, and at this time, the rise time and the fall time of the output electrical signal are longer.
When the rising time and the falling time of the output electric signal need to be reduced, the output end of the first capacitor is connected with the output end of the second capacitor through a third capacitor, namely the third capacitor is bridged between the differential signal lines.
The invention provides a compatible circuit for changing the rising time and the falling time of an output electric signal for an optical module, which can meet the 100G CWDM4 index and the 40G LR4 index, and does not need to design two PCB boards.
The invention solves the problems of multiple schemes and high cost, designs an optical module receiving end compatible scheme, and reduces design cost, production cost and the like.
The circuit is characterized in that a small-capacity capacitor is bridged between differential signals at the output end of a Driver, and when the rising time and the falling time of an output electric signal need to be reduced, the capacitor is welded; when the rising time and the falling time of the output electric signal need to be improved, the capacitor is not welded; in the application of the circuit in an optical module, a Driver driving chip with the same scheme can change the rising and falling time of an electric signal, so that various protocol requirements are met.
In this embodiment, there are 4 photodiodes, two output ports of the first photodiode corresponding to the Driver chip are electrically connected to the motherboard through a capacitor C1 and a capacitor C2, respectively, and when the rise and fall time of the output electrical signal needs to be reduced, the output terminal of the capacitor C1 is connected to the output terminal of the capacitor C2 through a capacitor C12;
two output ports of the second photodiode, corresponding to the Driver driving chip, are electrically connected with the mainboard through a capacitor C3 and a capacitor C4 respectively, and when the rising and falling time of an output electric signal needs to be reduced, the output end of the capacitor C3 is connected with the output end of the capacitor C4 through a capacitor C11;
two output ports of the third photodiode, corresponding to the Driver driving chip, are electrically connected with the motherboard through a capacitor C5 and a capacitor C6 respectively, and when the rising and falling time of an output electric signal needs to be reduced, the output end of the capacitor C5 is connected with the output end of the capacitor C6 through a capacitor C10;
two output ports of the fourth photodiode corresponding to the Driver driving chip are respectively electrically connected with the mainboard through a capacitor C7 and a capacitor C8, and when the rising time and the falling time of an output electric signal need to be reduced, the output end of the capacitor C7 is connected with the output end of the capacitor C8 through a capacitor C9.
FIG. 2 is a schematic diagram of the principle of the present invention, in which a photodiode PD is electrically connected to a motherboard through a Driver chip, a small-capacity capacitor is connected across the differential signal at the output terminal of the Driver chip, and the capacitor is soldered when the rise and fall time of the output electrical signal needs to be reduced; when the rising time and the falling time of the output electric signal need to be improved, the capacitor is not welded. Fig. 1 is a compatible circuit diagram for changing rising and falling times of an output electrical signal for an optical module according to an embodiment of the present invention, and 4 photodiodes are provided in this embodiment.
The implementation steps of the invention are as follows:
designing a PCB according to the scheme of figure 1;
C9-C12 did not patch when the rise/fall time was raised;
C9-C12 performed the patches when the rise/fall time was decreased.
The invention provides a compatible circuit for increasing/decreasing rising time and falling time of an optical module, and fig. 1 is a Driver output end circuit diagram. The circuit is characterized in that a small-capacity capacitor is bridged between differential signals at the output end of a Driver, and the capacitor is welded when the rising time and the falling time of an output electric signal need to be reduced; when the rising time and the falling time of the output electric signal need to be improved, the capacitor is not welded.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A compatible circuit for changing rising and falling time of an output electric signal for an optical module, characterized in that: the Driver driving chip comprises a photodiode, an output end and a mainboard, wherein the output end is electrically connected with the mainboard, the photodiode is electrically connected with an input port corresponding to the Driver driving chip, the photodiode corresponds to a first output port and a second output port of the Driver driving chip, the first output port is electrically connected with the mainboard through a first capacitor, and the second output port is electrically connected with the mainboard through a second capacitor.
2. A compatible circuit for changing rise and fall times of an output electric signal for an optical module according to claim 1, wherein: when the rising time and the falling time of the output electric signal need to be reduced, the output end of the first capacitor is connected with the output end of the second capacitor through a third capacitor.
3. A compatible circuit for changing rise and fall times of an output electric signal for an optical module according to claim 2, wherein: the number of the photodiodes is 4, two output ports of the first photodiode corresponding to the Driver driving chip are respectively electrically connected with the mainboard through a capacitor C1 and a capacitor C2, and when the rising time and the falling time of an output electric signal need to be reduced, the output end of the capacitor C1 is connected with the output end of the capacitor C2 through a capacitor C12;
two output ports of the second photodiode, corresponding to the Driver driving chip, are electrically connected with the mainboard through a capacitor C3 and a capacitor C4 respectively, and when the rising and falling time of an output electric signal needs to be reduced, the output end of the capacitor C3 is connected with the output end of the capacitor C4 through a capacitor C11;
two output ports of the third photodiode, corresponding to the Driver driving chip, are electrically connected with the motherboard through a capacitor C5 and a capacitor C6 respectively, and when the rising and falling time of an output electric signal needs to be reduced, the output end of the capacitor C5 is connected with the output end of the capacitor C6 through a capacitor C10;
two output ports of the fourth photodiode corresponding to the Driver driving chip are respectively electrically connected with the mainboard through a capacitor C7 and a capacitor C8, and when the rising time and the falling time of an output electric signal need to be reduced, the output end of the capacitor C7 is connected with the output end of the capacitor C8 through a capacitor C9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110339545.5A CN113259011B (en) | 2021-03-30 | 2021-03-30 | Compatible circuit for changing rising and falling time of output electric signal for optical module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110339545.5A CN113259011B (en) | 2021-03-30 | 2021-03-30 | Compatible circuit for changing rising and falling time of output electric signal for optical module |
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| CN113259011A true CN113259011A (en) | 2021-08-13 |
| CN113259011B CN113259011B (en) | 2022-09-02 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506521A (en) * | 1992-08-03 | 1996-04-09 | Unisys Corporation | ECL driver with adjustable rise and fall times, and method therefor |
| KR20060096936A (en) * | 2005-03-08 | 2006-09-13 | 산요 엡슨 이미징 디바이스 가부시키가이샤 | Semiconductor circuit, drive circuit of electro-optical device, electro-optical device, and electronic apparatus |
| US20090142074A1 (en) * | 2007-12-03 | 2009-06-04 | Fujitsu Limited | Optical receiving apparatus, optical line terminal apparatus, and optical network system |
| CN202395875U (en) * | 2011-11-22 | 2012-08-22 | 北京空间机电研究所 | Waveform driving circuit of remote sensing charge coupled device (CCD) camera |
| US20150214928A1 (en) * | 2014-01-28 | 2015-07-30 | ST Microelectronics International N.V. | System and Method for a Pre-Driver Circuit |
| US9246041B1 (en) * | 2012-04-26 | 2016-01-26 | Id Quantique Sa | Apparatus and method for allowing avalanche photodiode based single-photon detectors to be driven by the same electrical circuit in gated and in free-running modes |
| CN106125213A (en) * | 2016-08-26 | 2016-11-16 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN108123701A (en) * | 2016-11-30 | 2018-06-05 | 意法半导体有限公司 | Clock-signal generator |
-
2021
- 2021-03-30 CN CN202110339545.5A patent/CN113259011B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506521A (en) * | 1992-08-03 | 1996-04-09 | Unisys Corporation | ECL driver with adjustable rise and fall times, and method therefor |
| KR20060096936A (en) * | 2005-03-08 | 2006-09-13 | 산요 엡슨 이미징 디바이스 가부시키가이샤 | Semiconductor circuit, drive circuit of electro-optical device, electro-optical device, and electronic apparatus |
| US20090142074A1 (en) * | 2007-12-03 | 2009-06-04 | Fujitsu Limited | Optical receiving apparatus, optical line terminal apparatus, and optical network system |
| CN202395875U (en) * | 2011-11-22 | 2012-08-22 | 北京空间机电研究所 | Waveform driving circuit of remote sensing charge coupled device (CCD) camera |
| US9246041B1 (en) * | 2012-04-26 | 2016-01-26 | Id Quantique Sa | Apparatus and method for allowing avalanche photodiode based single-photon detectors to be driven by the same electrical circuit in gated and in free-running modes |
| US20150214928A1 (en) * | 2014-01-28 | 2015-07-30 | ST Microelectronics International N.V. | System and Method for a Pre-Driver Circuit |
| CN106125213A (en) * | 2016-08-26 | 2016-11-16 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN108123701A (en) * | 2016-11-30 | 2018-06-05 | 意法半导体有限公司 | Clock-signal generator |
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| CN113259011B (en) | 2022-09-02 |
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Denomination of invention: Compatible circuit for Optical module to change the rise and Fall time time of output electrical signal Effective date of registration: 20230629 Granted publication date: 20220902 Pledgee: China Construction Bank Corporation Wuhan Provincial Sub-branch Pledgor: WUHAN YINGFEI GUANGCHUANG TECHNOLOGY Co.,Ltd. Registration number: Y2023420000273 |
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