CN106341189A - Optical module - Google Patents
Optical module Download PDFInfo
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- CN106341189A CN106341189A CN201610822494.0A CN201610822494A CN106341189A CN 106341189 A CN106341189 A CN 106341189A CN 201610822494 A CN201610822494 A CN 201610822494A CN 106341189 A CN106341189 A CN 106341189A
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- Prior art keywords
- voltage
- signal
- circuit
- analogue amplifier
- optical module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to the optical communication technology field and especially relates to an optical module. The optical module comprises a photodetector, an analogue amplifier, a sampling circuit and a voltage-controlled attenuator. A signal input terminal of the analogue amplifier is electrically connected to a signal output terminal of the photodetector and the analogue amplifier is used for amplifying an electric signal output by the photodetector. The sampling circuit is electrically connected to a second signal output terminal of the analogue amplifier and is used for sampling a level amplitude output by the analogue amplifier. The voltage-controlled attenuator is served as a feedback circuit and is electrically connected between the signal input terminal and a first signal output terminal of the analogue amplifier, and a voltage control terminal is electrically connected to an output terminal of the sampling circuit. And the voltage-controlled attenuator is used for adjusting the level amplitude output by the analogue amplifier according to a sampling voltage output by the sampling circuit. The level amplitude output by the analogue amplifier is accurately and automatically controlled, single-chip microcomputer and other chips do not need to be used and cost is low.
Description
[technical field]
The present invention relates to technical field of photo communication, specifically, it is related to a kind of optical module.
[background technology]
Optical module is a kind of optical active devices realizing optical-electronic conversion and electrical-optical conversion, is the weight of optical communication equipment
Want functional module.In optical module communication system, it has been generally integrated radiofrequency signal amplification module, and radiofrequency signal is compared to numeral
Signal is more sensitive, can change with the luminous power size that optical module receives.When optical power change 1db, the width of radiofrequency signal
It is even more many that degree can change 2db；And the environment reason such as quality of the distance of transmission range, optical fiber wiring all can affect optical module
The luminous power that terminating receives, thus the output level amplitude fluctuations of radiofrequency signal amplification module can be led to greatly, also reduces whole
The stability of optical module communication system.
And existing optical module realizes the level magnitude that radiofrequency signal amplification module is exported using power samples chip
Automatically control, after being sampled by the level magnitude that power samples chip is exported to radiofrequency signal amplification module, then will
This level magnitude is input to single-chip microcomputer, is realized the electricity that radiofrequency signal amplification module is exported by Single-chip Controlling digital pad
The automatic stabilisation of open width value.But the prior art adopts power samples chip that level magnitude is sampled, and is vulnerable to telecommunication circuit
Interference so that the level magnitude sampled is undergone mutation；And there is stepping it is impossible to realize to letter in the digital pad being adopted
Number continuous control, affect control accuracy；And power samples chip used in the prior art, single-chip microcomputer and digital pad
The cost of whole optical module can be increased.
[content of the invention]
The purpose of the present invention aims to solve the problem that the level magnitude in existing optical module, radiofrequency signal amplification module being exported enters
When row automatically controls, there is a problem of being unable to continuous control and lead to control accuracy poor and high cost, a kind of optical module is provided.
For realizing this purpose, the present invention adopts the following technical scheme that
The invention provides a kind of optical module, it includes: photodetector, analogue amplifier, sample circuit and voltage-controlled decline
Subtract device；
Described sample circuit, electrically connects the secondary signal outfan of described analogue amplifier, for this Simulation scale-up of sampling
The level magnitude that device is exported；
Described voltage-controlled attenuator, is connected electrically in signal input part and first letter of described analogue amplifier as feedback circuit
Between number outfan, and its voltage controling end electrically connects the outfan of described sample circuit；For defeated according to this sample circuit institute
The sampled voltage going out, adjusts the level magnitude that described analogue amplifier is exported.
Compared with prior art, the present invention possesses following advantage:
One of this programme optical module, includes photo-detector, analogue amplifier, sample circuit and voltage-controlled attenuator,
The signal input part of wherein analogue amplifier electrically connects the signal output part of described photo-detector, for amplifying this photo-detector institute
The signal of telecommunication of output；Sample circuit electrically connects the secondary signal outfan of described analogue amplifier, for this Simulation scale-up of sampling
The level magnitude that device is exported；And voltage-controlled attenuator is connected electrically in the signal input part of described analogue amplifier as feedback circuit
And the first signal output part between, and its voltage controling end electrically connects the outfan of described sample circuit；For according to this sampling
The sampled voltage that circuit is exported, controls the impedance of diode in this voltage-controlled attenuator, and then changes analogue amplifier two ends
Feedback parameter, you can change the gain amplifier multiple of analogue amplifier, thus adjusting the level that described analogue amplifier is exported
Amplitude.Realize accurately the automatically controlling of level magnitude that analogue amplifier is exported, and the chips such as single-chip microcomputer need not be adopted, become
This is low.
The aspect that the present invention adds and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by the embodiment of this programme.
[brief description]
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to embodiment or description of the prior art
In required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some are real
Apply example, but the invention is not restricted to this.
Fig. 1 is the structural representation in an a kind of embodiment of optical module of the present invention.
[specific embodiment]
With exemplary embodiment, the present invention is further described below in conjunction with the accompanying drawings, the example of described embodiment is attached
In figure illustrates, wherein same or similar label represents same or similar element or has same or like function from start to finish
Element.Embodiment below with reference to Description of Drawings is exemplary, be only used for explain the present invention, and can not be construed to right
The restriction of the present invention.Additionally, if it is known that the detailed description of technology is for illustrating the invention is characterized in that unnecessary, then by it
Omit.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " " used herein, "
Individual ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that arranging used in the description of the present invention
Diction " inclusion " refers to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existing or adding
Other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when we claim unit
Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or can also exist
Intermediary element.Additionally, " connection " used herein or " coupling " can include wirelessly connecting or wirelessly coupling.Used herein arrange
Diction "and/or" includes one or more associated list the whole of item or any cell and combines with whole.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (include technology art
Language and scientific terminology), there is the general understanding identical meaning with the those of ordinary skill in art of the present invention.Also should
Be understood by, those terms defined in such as general dictionary it should be understood that have with the context of prior art in
The consistent meaning of meaning, and unless by specific definitions as here, otherwise will not use idealization or excessively formal implication
To explain.
The specific embodiment of this programme is detailed below.
Specifically, refer to accompanying drawing 1, be a kind of optical module described in this programme, this optical module includes and is electrically connected to each other
Photodetector 10 and analogue amplifier 20, wherein photodetector 10 be used for the optical signal receiving is converted into the signal of telecommunication, then
The signal input part that this signal of telecommunication is input to analogue amplifier 20 is amplified processing.In an embodiment of this programme,
Described photodetector 10 can be pin photodiode or avalanche photodide apd.
It should be noted that in optical module communication system, the optical signal receiving is converted into telecommunications by photo-detector 10
Number, then the signal of telecommunication is input to signal amplification module.And after photo-detector 10 receives optical signal, this optical signal can be changed
Become digital electric signal or analog electrical signal, wherein digital electric signal only has 0 and 1 two kind of signal level, then signal amplification module and
Receiving terminal below only needs to judge the low and high level of digital electric signal this digital electric signal of decoding it is possible to errorless；And
Analog electrical signal is more sensitive compared to digital electric signal, and is continually varying, and different signal amplitudes carries different letters
Breath, the therefore amplitude of variation of the accurate recovering signal of receiving terminal are just very crucial for correct decoding.And in same mould
Intend under signal of telecommunication modulation amplitude, carrier wave light intensity change can affect the level magnitudes of final output, thus leading to judge by accident.Therefore, right
For the optical module of transmission analog electrical signal, keep the level magnitudes under different carrier light intensity stable, be necessary requirement, phase
The analogue amplifier to electrical connection photo-detector 10 answered and follow-up sample circuit have high demands.
Specifically, in an embodiment of this programme, described analogue amplifier 20 includes first order amplifying circuit b1
With second level amplifying circuit b2, wherein said photo-detector 10 electrically connects the signal input part in1 of this first order amplifying circuit b1,
The signal output part out1 of this first order amplifying circuit b1 accesses the signal input part in2 of this second level amplifying circuit b2, wherein
The signal output part out1 of described first order amplifying circuit b1 is the first signal output part, the letter of described second level amplifying circuit b2
Number outfan out2 is secondary signal outfan.And described analogue amplifier 20 is used for simulation electricity that photo-detector 10 is exported
Signal is realized amplifying.
Further, the output signal of the analogue amplifier 20 of this optical module only has tens db microvolts under normal circumstances, needs
Precision to be adopted is higher and stable sample circuit of sampling is sampled to 20 output level amplitudes of this analogue amplifier.At this
In scheme, also include the sample circuit 30 of the secondary signal outfan out2 electrically connecting described analogue amplifier 20, for right
The level magnitude that this analogue amplifier 20 is exported is sampled.Specifically, in an embodiment of this programme, described sampling
Circuit 30 be average detecting circuit, due to average detecting circuit sampling output be a period of time average, output more stable,
Can avoid due to the unnecessary adjustment to analogue amplifier 20 gain caused by sampling momentary fluctuation or external disturbance, thus
Ensure stablizing of 20 output amplitudes of analogue amplifier.
Specifically, in an embodiment of this programme, described sample circuit 30 includes the first order being sequentially connected electrically
The outfan of discharge circuit a1 and second level discharge circuit a2, wherein said first order discharge circuit a1 passes through the diode of concatenation
D2 and resistance r6 electrically connects the positive input terminal of second level discharge circuit a2, and the anode of this diode d2 is electrically connected by resistance r2
The positive input terminal of described first order discharge circuit a1.The negative input end of described first order discharge circuit a1 is grounded by resistance r5,
The negative input end of described second level discharge circuit a2 is grounded by resistance r7.The secondary signal outfan of described analogue amplifier 20
Out2 electrically connects the positive input terminal of this first order discharge circuit a1 by the resistance r4 of concatenation, and secondary signal outfan out2 passes through
The resistance r1 of concatenation electrically connects the positive input terminal of this second level discharge circuit a2；And the positive input terminal of this first order discharge circuit a1
And outfan between bridging have diode d1, between the positive input terminal of this second level discharge circuit a2 and outfan bridging have in parallel
Resistance r3 and electric capacity c1.
Further, optical module described in this programme also includes operational amplifier 40 and voltage-controlled attenuator 50.Wherein said
Operational amplifier 40 electrically connects the outfan of described sample circuit 30 and the voltage controling end (in figure 2 of described voltage-controlled attenuator 50
Foot, 4 feet and 5 feet) between, for amplifying the sampled voltage that this sample circuit 30 is exported；Described voltage-controlled attenuator 50, as anti-
Current feed circuit is connected electrically between the signal input part of described analogue amplifier 20 and the first signal output part out1, and its voltage control
End (in figure 2 foot, 4 feet and 5 feet) processed electrically connects the outfan of described sample circuit 30；For being exported according to this sample circuit 30
Sampled voltage, adjust the level magnitude that exported of described analogue amplifier 20.
Because the sampled voltage of sample circuit 30 output is smaller, control the voltage ratio of voltage-controlled attenuator 50 larger, therefore
In an embodiment of this programme, need to do using operational amplifier 40 scaling.Specifically, the sampling of sample circuit 30
To the input in of operational amplifier 40, in operational amplifier 40, sampled voltage and reference voltage vref are compared control source
Relatively, produce the voltage controling end (in figure 2 foot) that control signal driver is input to voltage-controlled attenuator 50, and produce control signal
Shunt is input to the voltage controling end (in figure 4 foot and 5 feet) of voltage-controlled attenuator 50；Wherein said control signal shunt passes through electricity
Resistance r11 connects 4 feet of described voltage-controlled attenuator 50, and described control signal shunt connects described voltage-controlled attenuator by resistance r12
50 5 feet.
Further, in an embodiment of this programme, the voltage-controlled voltage output end (in figure of described voltage-controlled attenuator 50
1 foot and 3 feet) it is connected electrically between the signal input part in1 and signal output part out1 of first order amplifying circuit b1.
Specifically, when sample circuit 30 detects the level magnitude increase that analogue amplifier 20 is exported, its output
Sampled voltage also increases immediately, by operational amplifier 40 do scaling after, be added to the voltage controling end 2 of voltage-controlled attenuator 50
The voltage of foot also increases, and this voltage is added on the diode in voltage-controlled attenuator 50, thus change diode by electric current, profit
With diode reverse impedance with the characteristic of curent change, and then make voltage-controlled voltage output end (in figure 1 foot of voltage-controlled attenuator 50
And 3 feet) between impedance reduce, feed back to signal input part from the first signal output part out1 of first order amplifying circuit b1
The signal amplitude of in1 just increases, according to the operation principle of reversed feedback amplifier, the level width of now analogue amplifier 20 output
Value can diminish, thus realizing 20 output level amplitudes of this analogue amplifier are automatically controlled.Conversely, when sample circuit 30 is examined
When measuring the level magnitude reduction that analogue amplifier 20 is exported, the sampled voltage of its output also reduces immediately, is put by computing
Big device 40 do scaling after, the voltage being added to voltage controling end 2 foot of voltage-controlled attenuator 50 also reduces, voltage-controlled attenuator 50
Impedance between voltage-controlled voltage output end (in figure 1 foot and 3 feet) increases, that is, from first signal output of first order amplifying circuit b1
The signal amplitude that end out1 feeds back to signal input part in1 is reduced by, according to the operation principle of reversed feedback amplifier, now mould
The level magnitude intending amplifier 20 output can increase, thus realizing the automatic control to this 20 output level amplitude of analogue amplifier
System, reaches the purpose of the level magnitude stablizing the output of this analogue amplifier 20.
In sum, one of this programme optical module, includes photo-detector 10, analogue amplifier 20, sample circuit
30 and voltage-controlled attenuator 50, the wherein signal input part of analogue amplifier 20 electrically connects the signal output of described photo-detector 10
End, for amplifying the signal of telecommunication that this photo-detector 10 is exported；Sample circuit 30 electrically connects the signal of described analogue amplifier 20
Outfan, the level magnitude being exported for this analogue amplifier 20 of sampling；And voltage-controlled attenuator 50 is electrically connected as feedback circuit
It is connected between signal input part and the signal output part of described analogue amplifier 20, and its voltage controling end electrically connects described sampling
The outfan of circuit 30；For the sampled voltage being exported according to this sample circuit 30, control two poles in this voltage-controlled attenuator 50
The impedance of pipe, and then change the feedback parameter at analogue amplifier 20 two ends, you can change the gain amplifier times of analogue amplifier 20
Number, thus adjust the level magnitude that described analogue amplifier 20 is exported.Realize the level width that analogue amplifier 20 is exported
Accurately the automatically controlling of value, and the chips such as single-chip microcomputer, low cost need not be adopted.
Although illustrating substantial amounts of detail in description mentioned herein.It is to be appreciated, however, that the present invention
Embodiment can put into practice in the case of there is no these details.In certain embodiments, known to being not been shown in detail
Method, structure and technology, so as not to obscure the understanding of this description.
Although having been illustrated with some exemplary embodiments of the present invention above, those skilled in the art will manage
Solution, in the case of the principle without departing from the present invention or spirit, can make a change to these exemplary embodiments, the present invention's
Scope is limited by claim and its equivalent.
Claims (9)
1. a kind of optical module is it is characterised in that include: photodetector, analogue amplifier, sample circuit and voltage-controlled attenuator；
Described analogue amplifier, its signal input part electrically connects the signal output part of described photodetector, for amplifying the inspection of this light
Survey the signal of telecommunication that device is exported；
Described sample circuit, electrically connects the secondary signal outfan of described analogue amplifier, for this analogue amplifier institute that samples
The level magnitude of output；
Described voltage-controlled attenuator, the signal input part being connected electrically in described analogue amplifier as feedback circuit is defeated with the first signal
Go out between end, and its voltage controling end electrically connects the outfan of described sample circuit；For exported according to this sample circuit
Sampled voltage, adjusts the level magnitude that described analogue amplifier is exported.
2. optical module according to claim 1 it is characterised in that: also include operational amplifier,
Described operational amplifier, electrically connect described sample circuit outfan and described voltage-controlled attenuator voltage controling end it
Between, for amplifying the sampled voltage that this sample circuit is exported.
3. optical module according to claim 2 it is characterised in that: described operational amplifier, for by described sampled voltage
It is compared to export difference control signal with default reference level, wherein this difference control signal is used for adjusting this and voltage-controlled declines
Subtract the impedance of device.
4. optical module according to claim 1 it is characterised in that: described analogue amplifier, for amplifying this photodetector
The analog electrical signal being exported.
5. optical module according to claim 1 it is characterised in that: described photodetector includes pin photodiode or snow
Avalanche photo diode, for being converted to analog electrical signal by the optical signal receiving.
6. optical module according to claim 1 it is characterised in that: described sample circuit includes average detecting circuit.
7. optical module according to claim 6 it is characterised in that: described average detecting circuit includes and is sequentially connected electrically
First order discharge circuit and second level discharge circuit.
8. optical module according to claim 1 it is characterised in that: described analogue amplifier includes first being sequentially connected electrically
Level amplifying circuit and second level amplifying circuit, the signal output part of wherein said first order amplifying circuit is the first signal output
End, the signal output part of described second level amplifying circuit is secondary signal outfan.
9. optical module according to claim 8 it is characterised in that: voltage-controlled attenuator is connected electrically in described as feedback circuit
Between the signal input part of first order amplifying circuit and the first signal output part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610822494.0A CN106341189B (en) | 2016-09-14 | 2016-09-14 | Optical module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610822494.0A CN106341189B (en) | 2016-09-14 | 2016-09-14 | Optical module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106341189A true CN106341189A (en) | 2017-01-18 |
| CN106341189B CN106341189B (en) | 2019-08-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610822494.0A Active CN106341189B (en) | 2016-09-14 | 2016-09-14 | Optical module |
Country Status (1)
| Country | Link |
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| CN (1) | CN106341189B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521305A (en) * | 2018-06-11 | 2018-09-11 | 广西电网有限责任公司柳州供电局 | Fiber-optic signal receiving circuit |
| CN109217929A (en) * | 2018-10-29 | 2019-01-15 | 黄河科技学院 | A kind of super high speed all-optical communication system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201298848Y (en) * | 2008-11-11 | 2009-08-26 | 无锡雷华网络技术有限公司 | Broadband photoelectric conversion automatic gain control circuit structure |
| CN202364227U (en) * | 2011-12-16 | 2012-08-01 | 深圳市万和电子有限公司 | Optical receiving module |
| US20140160440A1 (en) * | 2012-12-06 | 2014-06-12 | Panasonic Corporation | Light quantity measurement apparatus and projection-type display device equipped with same |
| CN204349993U (en) * | 2014-12-05 | 2015-05-20 | 上海凌云天博光电科技有限公司 | A kind of light-operated gain control circuit and optical receiver |
-
2016
- 2016-09-14 CN CN201610822494.0A patent/CN106341189B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201298848Y (en) * | 2008-11-11 | 2009-08-26 | 无锡雷华网络技术有限公司 | Broadband photoelectric conversion automatic gain control circuit structure |
| CN202364227U (en) * | 2011-12-16 | 2012-08-01 | 深圳市万和电子有限公司 | Optical receiving module |
| US20140160440A1 (en) * | 2012-12-06 | 2014-06-12 | Panasonic Corporation | Light quantity measurement apparatus and projection-type display device equipped with same |
| CN204349993U (en) * | 2014-12-05 | 2015-05-20 | 上海凌云天博光电科技有限公司 | A kind of light-operated gain control circuit and optical receiver |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521305A (en) * | 2018-06-11 | 2018-09-11 | 广西电网有限责任公司柳州供电局 | Fiber-optic signal receiving circuit |
| CN109217929A (en) * | 2018-10-29 | 2019-01-15 | 黄河科技学院 | A kind of super high speed all-optical communication system |
| CN109217929B (en) * | 2018-10-29 | 2020-06-05 | 中原工学院 | Superspeed all-optical communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106341189B (en) | 2019-08-09 |
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