CN107231199B - Optical module with overcurrent protection function - Google Patents
Optical module with overcurrent protection function Download PDFInfo
- Publication number
- CN107231199B CN107231199B CN201710404543.3A CN201710404543A CN107231199B CN 107231199 B CN107231199 B CN 107231199B CN 201710404543 A CN201710404543 A CN 201710404543A CN 107231199 B CN107231199 B CN 107231199B
- Authority
- CN
- China
- Prior art keywords
- optical module
- apd
- power supply
- booster circuit
- avalanche photodide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
Abstract
The present invention provides a kind of optical modules with overcurrent protection function; when optical module receives strong light; detect the electric current for flowing into the avalanche photodide of optical assembly beyond preset threshold current Ith; then close the power supply chip in booster circuit; the voltage for reducing the avalanche photodide, plays a protective role.Using the over-current protection method applied to optical module in the present invention, solves optical module in the case where receiving strong light, the problem of avalanche photodide APD in optical assembly BOSA flows into excessive photoelectric current, damages.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of overcurrent protection designs applied to optical module, specifically
It is related to a kind of optical module with overcurrent protection function.
Background technique
In recent years, optical communications industry develops rapidly.Passive optical network (PON) is most widely applied in current optical access network
Technology, it be on solving the problems, such as broadband access it is a kind of it is economical, face the future multiple services user's access technology.PON technology
It is related to photoelectric conversion and electro-optic conversion.And these functions are realized by optical module.It is kept away in the practical application of optical module
The situation for unavoidably accessing strong light needs optical module itself to have highlight protection function.
The receiving side of the optical assembly BOSA of major part optical module uses avalanche photodide APD at present.Snowslide light
Electric diode APD needs relatively high reverse biased at work, therefore needs to give avalanche photodide APD in optical module
DC-DC booster circuit outside plus.When the optical power of input is constant, the photoelectric current that avalanche photodide APD is generated is
Increase with the increase of reverse biased, reduces with the reduction of reverse biased.DC-DC booster circuit is supplied to avalanche optoelectronic
The voltage of diode APD be it is invariable, when input optical power is more than 0~-4dBm, avalanche photodide APD can be generated
Excessive photoelectric current (0.5~1mA of >), the probability that APD is damaged under this situation are high.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, light under intense light conditions can be prevented by providing one kind
The optical module with overcurrent protection function of avalanche photodide APD damage in the optical assembly BOSA of module.
To achieve the goals above, the optical module with overcurrent protection function of the invention has following constitute:
The optical module with overcurrent protection function, including avalanche photodide APD and booster circuit, the snow
Avalanche photo diode APD is arranged in the optical assembly BOSA in optical module, and avalanche photodide APD and the boosting
Circuit is connected, and the booster circuit, which provides reverse biased to the avalanche photodide APD, makes the snowslide light
Electric diode APD is in running order, which is characterized in that between the avalanche photodide APD and booster circuit also
It is provided with a current foldback circuit, the current foldback circuit acts on the enabled of the power supply chip in the booster circuit
End, the current foldback circuit enable the power supply core when the received optical power of the optical module meets a preset range
Piece makes the booster circuit provide the reverse biased that can supply its work to the avalanche photodide APD, and in the light
The received optical power of module is unsatisfactory for closing the power supply chip when preset range, stops the booster circuit to institute
The avalanche photodide APD stated provides the reverse biased that can supply its work, until the received optical power of the optical module is full again
The foot preset range.
Preferably, the current foldback circuit provides a threshold current for the optical module, the optical module is connect
When the optical power of receipts meets the preset range, the electric current for flowing into the avalanche photodide APD is less than the threshold current, by
The current foldback circuit enables the power supply chip in the booster circuit；The received optical power of the optical module is discontented
When the foot preset range, the electric current for flowing into the avalanche photodide APD is greater than the threshold current, is protected by the overcurrent
Protection circuit closes the power supply chip in the booster circuit.
More preferably, the current foldback circuit includes the pull-up resistor R1 for being set to the power supply chip enable end,
The electricity is enabled to obtain enabled level VCC by pull-up resistor R1 when the received optical power of optical module meets preset range
Source chip, the current foldback circuit further includes one the 4th resistance R4, PMOS tube and NMOS tube, wherein the avalanche optoelectronic
Diode APD is connected to the booster circuit by the 4th resistance R4, and the grid and source electrode of the PMOS tube are connected to
The both ends of the 4th resistance R4, the grid and source electrode of the NMOS tube are connected to the both ends of one second divider resistance R3,
The one end second divider resistance R3 ground connection, the other end are connected to the drain electrode of the PMOS tube by one first divider resistance R2,
The drain electrode of the NMOS tube is connected to the enable end of the power supply chip.
It is particularly preferred that the enabled level VCC that the resistance value of pull-up resistor R1 meets its generation can enable wanting for the power supply chip
It asks, the power supply is enable to make when the electric current for flowing into the avalanche photodide APD is less than the threshold current
Power supply chip described in energy, and the grid source conducting voltage of the grid source conducting voltage of the PMOS tube and NMOS tube with it is described
Preset range matches.
Preferably, the PMOS tube and NMOS tube are the metal-oxide-semiconductor with the quick characteristic for opening shutdown, switching speed exists
The magnitude of few tens of nano-seconds.
Preferably, the booster circuit is a DC-DC booster circuit.
Using the optical module with overcurrent protection function of the invention, due to current foldback circuit therein to 1 PMOS
Pipe and 1 NMOS tube and several resistance, therefore design very succinct, and cost is very low, and due to PMOS tube and NMOS tube
The characteristic for quickly opening shutdown, in the removal of strong light, DC-DC booster circuit can automatically reply normal working condition, without
Need to restart optical module, and the over-current protection method bring extra power consumption very little.Using the technical solution in the present invention, solve
For optical module in the case where receiving strong light, the APD of BOSA is due to flowing into the problem of excessive photoelectric current damages.
Detailed description of the invention
Fig. 1 is the functional block diagram of the optical module in the present invention.
Fig. 2 is that the current foldback circuit in the present invention is connected to the circuit diagram between BOSA and booster circuit.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
Referring to Fig. 1, an optical module with overcurrent protection function, including avalanche photodide APD and boosting
Circuit, the avalanche photodide APD is arranged in the optical assembly BOSA in optical module, and the avalanche photodide
APD is connected with the booster circuit, and the booster circuit provides reverse biased to the avalanche photodide APD
Keep the avalanche photodide APD in running order, which is characterized in that the avalanche photodide APD and
A current foldback circuit is additionally provided between booster circuit, the current foldback circuit acts in the booster circuit
The enable end of power supply chip, the current foldback circuit are enabled when the received optical power of the optical module meets a preset range
The power supply chip, providing the booster circuit to the avalanche photodide APD can be for the reversed of its work
Bias, and the power supply chip is closed when the received optical power of the optical module is unsatisfactory for the preset range, make the liter
Volt circuit stops providing the reverse biased that can supply its work to the avalanche photodide APD, until the optical module receives
Optical power meet the preset range again.
The current foldback circuit provides a threshold current, the received smooth function of the optical module for the optical module
When rate meets the preset range, the electric current for flowing into the avalanche photodide APD is less than the threshold current, by the mistake
Stream protection circuit enables the power supply chip in the booster circuit；It is default that the received optical power of the optical module is unsatisfactory for this
When range, the electric current for flowing into the avalanche photodide APD is greater than the threshold current, is closed by the current foldback circuit
Close the power supply chip in the booster circuit.
In a kind of specific embodiment, the current foldback circuit includes being set to the power supply chip to enable
The pull-up resistor R1 at end, it is enabled to pass through pull-up resistor R1 acquisition when the received optical power of optical module meets preset range
Level VCC enables the power supply chip, and the current foldback circuit further includes one the 4th resistance R4, PMOS tube and NMOS tube,
Described in avalanche photodide APD the booster circuit is connected to by the 4th resistance R4, the PMOS tube
Grid and source electrode are connected to the both ends of the 4th resistance R4, and the grid and source electrode of the NMOS tube are connected to one second point
The both ends of piezoresistance R3, the one end the second divider resistance R3 ground connection, the other end are connected to described by one first divider resistance R2
PMOS tube drain electrode, the drain electrode of the NMOS tube is connected to the enable end of the power supply chip.
The enabled level VCC that the resistance value of pull-up resistor R1 meets its generation can enable the requirement of the power supply chip, make institute
The power supply stated can enable described when the electric current for flowing into the avalanche photodide APD is less than the threshold current
Power supply chip, and the grid source conducting voltage of the grid source conducting voltage of the PMOS tube and NMOS tube with the preset range
Match.
The PMOS tube and NMOS tube is the metal-oxide-semiconductor with the quick characteristic for opening shutdown, and switching speed is received tens of
Second magnitude, to meet the optical power of optical module input at preset range edge, the PMOS tube and NMOS tube into
Row quickly opens the demand of shutdown.
In a kind of specific embodiment, the booster circuit is a DC-DC booster circuit.
Referring to Fig. 2, in a specific embodiment, the optical module with overcurrent protection function is in addition to described in Fig. 1
It further include PMOS tube, NMOS tube and resistance except modules, the present invention adds overcurrent protection electricity in booster circuit rear end
It is opened when the photoelectric current for flowing into avalanche photodide APD generation is greater than the threshold current Ith of current foldback circuit setting on road
Metal-oxide-semiconductor is opened, power supply chip is closed, reduces the voltage of avalanche photodide APD, the light for generating avalanche photodide APD
Electric current is lower than the threshold current set, to realize the overcurrent protection function of optical module.When strong light is eliminated, the DC-DC liter
Volt circuit due to, using having the metal-oxide-semiconductor for quickly opening turn-off function, can also restore in time in current foldback circuit
The normal work of avalanche photodide APD.And since the defencive function to avalanche photodide APD is by closing power supply
What chip was realized, therefore bring extra power consumption is smaller.
In the case where the input optical power of the optical module is in normal range (NR) less than -4dBm, the snowslide light of BOSA is flowed into
Electric diode APD electric current I is less than Ith, wherein Ith=VGS/R4, and I is less than grid source by the voltage VGS that the 4th resistance R4 is generated
Conducting voltage VGSth, PMOS tube Q2 is closed state at this time, and the voltage of the second two sides divider resistance R3 is 0, and NMOS tube Q1 is also
The state of closing, the enabled pin of the power supply chip of booster circuit is pulled upward to VCC by pull-up resistor R1 at this time, and power supply chip is just
The ena-bung function of normal working power chip is usually that high level is effective, can be in conjunction with the present invention for the effective situation of low level
Principle adjustment circuit.The voltage of avalanche photodide APD is normal at this time, and entire circuit is in normal operating conditions.
In the case where inputting strong light, the avalanche photodide APD electric current I for flowing into optical assembly BOSA is greater than Ith, wherein
Ith=VGS/R4, I are greater than grid source conducting voltage VGSth by the voltage VGS that the 4th resistance R4 is generated, and PMOS tube Q2 is opened rapidly
It opening, the voltage of the second two sides divider resistance R3 is VAPD × R3/ (R2+R3), the VGS maximum working voltage for commonly using metal-oxide-semiconductor is ±
20V, VAPD are generally higher than 30V, it is therefore desirable to be divided using R2 and R3, NMOS tube Q1 is also opened rapidly, at this time boosting electricity
The enabled pin of the power supply chip on road pulls down to ground by Q1, and power supply chip is closed without enabled level.Avalanche optoelectronic two at this time
The voltage of pole pipe APD declines, and the avalanche photodide APD electric current for flowing into optical assembly BOSA is also dropped rapidly to the threshold value of setting
Electric current.
In the case where strong light is eliminated, the avalanche photodide APD electric current I for flowing into optical assembly BOSA is less than Ith wherein
Ith=VGS/R4, I are less than VGSth by the voltage VGS that the 4th resistance generates, and PMOS tube Q2 is re-closing off, the second divider resistance
The voltage of the two sides R3 is 0, and NMOS tube Q1 is also switched off, and the enabled pin of the power supply chip in booster circuit passes through pull-up resistor at this time
R1 is pulled upward to VCC, and power supply chip restores to work normally.The voltage of avalanche photodide APD restores normal at this time, entire circuit
Again it is in normal operating conditions.
Using the optical module with overcurrent protection function of the invention, due to only using 1 PMOS in current foldback circuit
Pipe and 1 NMOS tube and several resistance, therefore design very succinct, and cost is very low, and due to PMOS tube and NMOS tube
The characteristic for quickly opening shutdown, in the removal of strong light, DC-DC booster circuit can automatically reply normal working condition, without
Need to restart optical module, and the over-current protection method bring extra power consumption very little.Using the technical solution in the present invention, solve
For optical module in the case where receiving strong light, the avalanche photodide APD of optical assembly BOSA is due to flowing into excessive photoelectricity
The problem of outflow now damages.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (6)
1. a kind of optical module with overcurrent protection function, including avalanche photodide (APD) and booster circuit, described
Avalanche photodide (APD) is arranged in the optical assembly in optical module (BOSA), and the avalanche photodide (APD) and institute
The booster circuit stated is connected, and the booster circuit, which provides reverse biased to the avalanche photodide (APD), makes institute
The avalanche photodide (APD) stated is in running order, which is characterized in that the avalanche photodide (APD) and
A current foldback circuit is additionally provided between booster circuit, the current foldback circuit acts in the booster circuit
The enable end of power supply chip, the current foldback circuit are enabled when the received optical power of the optical module meets a preset range
The power supply chip, providing the booster circuit to the avalanche photodide (APD) can be for the anti-of its work
To bias, and the power supply chip is closed when the received optical power of the optical module is unsatisfactory for the preset range, make described
Booster circuit stops providing the reverse biased that can supply its work to the avalanche photodide (APD), until the optical module
Received optical power meets the preset range again.
2. the optical module according to claim 1 with overcurrent protection function, which is characterized in that the overcurrent protection electricity
Road is that the optical module sets a threshold current, when the received optical power of the optical module meets the preset range, is flowed into
The electric current of the avalanche photodide (APD) is less than the threshold current, enabled described by the current foldback circuit
Power supply chip in booster circuit；When the received optical power of the optical module is unsatisfactory for the preset range, the snow is flowed into
The electric current of avalanche photo diode (APD) is greater than the threshold current, and the booster circuit is closed by the current foldback circuit
In power supply chip.
3. the optical module according to claim 2 with overcurrent protection function, which is characterized in that the overcurrent protection electricity
Road includes the pull-up resistor (R1) for being set to the power supply chip enable end, pre- to meet in the received optical power of optical module
If obtaining enabled level (VCC) by the pull-up resistor (R1) when range enables the power supply chip, the current foldback circuit
It further include one the 4th resistance (R4), PMOS tube and NMOS tube, wherein the avalanche photodide (APD) passes through the 4th electricity
Resistance (R4) is connected to the booster circuit, and the grid and source electrode of the PMOS tube are connected to the 4th resistance (R4)
Both ends, the grid and source electrode of the NMOS tube are connected to the both ends of one second divider resistance (R3), second divider resistance
(R3) one end is grounded, and the other end is connected to the drain electrode of the PMOS tube by one first divider resistance (R2), the NMOS tube
Drain electrode is connected to the enable end of the power supply chip.
4. the optical module according to claim 3 with overcurrent protection function, which is characterized in that the resistance of pull-up resistor (R1)
The enabled level (VCC) that value meets its generation can enable the requirement of the power supply chip, and power supply is made to flow into the snowslide light
The electric current of electric diode (APD) can enable the power supply chip, and the PMOS tube when being less than the threshold current
Grid source conducting voltage and the grid source conducting voltage of NMOS tube match with the preset range.
5. the optical module according to claim 3 with overcurrent protection function, which is characterized in that the PMOS tube and
NMOS tube is the metal-oxide-semiconductor with the quick characteristic for opening shutdown, magnitude of the switching speed in few tens of nano-seconds.
6. the optical module according to claim 1 with overcurrent protection function, which is characterized in that the booster circuit is
One DC-DC booster circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710404543.3A CN107231199B (en) | 2017-06-01 | 2017-06-01 | Optical module with overcurrent protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710404543.3A CN107231199B (en) | 2017-06-01 | 2017-06-01 | Optical module with overcurrent protection function |
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| Publication Number | Publication Date |
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| CN107231199A CN107231199A (en) | 2017-10-03 |
| CN107231199B true CN107231199B (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710404543.3A Active CN107231199B (en) | 2017-06-01 | 2017-06-01 | Optical module with overcurrent protection function |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896979B (en) * | 2018-07-13 | 2021-09-21 | 中山大学 | Pulse laser radar receiving circuit and system with ultra-wide single-shot measurement range |
| CN109217272B (en) * | 2018-11-07 | 2020-07-07 | 东莞铭普光磁股份有限公司 | APD optical module and protection circuit and protection method thereof |
| CN111431613B (en) * | 2020-03-20 | 2023-03-21 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN113315583B (en) * | 2021-07-29 | 2021-11-19 | 深圳市迅特通信技术股份有限公司 | Protection circuit of APD detector in optical module and optical module |
| CN115865185B (en) * | 2023-02-02 | 2023-12-22 | 中天通信技术有限公司 | Big light protection device, optical module and big light protection method |
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| CN1790946A (en) * | 2004-12-17 | 2006-06-21 | 中兴通讯股份有限公司 | Optical receiving module with overload protection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4379328B2 (en) * | 2004-12-20 | 2009-12-09 | 住友電気工業株式会社 | Optical receiver |
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|---|---|---|---|---|
| CN1790946A (en) * | 2004-12-17 | 2006-06-21 | 中兴通讯股份有限公司 | Optical receiving module with overload protection function |
| CN2790003Y (en) * | 2005-04-15 | 2006-06-21 | 海信集团有限公司 | APD device work protection circuit |
| CN201294374Y (en) * | 2008-11-27 | 2009-08-19 | 凯迈（洛阳）测控有限公司 | APD drive circuit with over current protection and controllable driving voltage |
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| Publication number | Publication date |
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| CN107231199A (en) | 2017-10-03 |
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