CN102594445A - Emergency monitoring method and circuit for laser dispensing with backlight diodes - Google Patents
Emergency monitoring method and circuit for laser dispensing with backlight diodes Download PDFInfo
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- CN102594445A CN102594445A CN2011103882787A CN201110388278A CN102594445A CN 102594445 A CN102594445 A CN 102594445A CN 2011103882787 A CN2011103882787 A CN 2011103882787A CN 201110388278 A CN201110388278 A CN 201110388278A CN 102594445 A CN102594445 A CN 102594445A
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Abstract
The invention discloses an emergency monitoring circuit for a laser dispensing with backlight diodes. The emergency monitoring circuit is characterized by comprising a voltage sampling unit and a comparing unit, wherein the voltage sampling unit comprises a filter circuit, and the filter circuit comprises a voltage sampling terminal connected to a negative-terminal driving current branch circuit of the laser and a sampling output terminal filtering the AC voltage at the voltage sampling terminal into an average value; the comparing unit is provided with a comparison input terminal connected with the voltage sampling terminal, a reference threshold terminal connected with a reference threshold voltage and a comparison output terminal for outputting the result of voltage comparison between the comparison input terminal and the reference threshold terminal; and a voltage sampling resistor is arranged between the voltage sampling terminal and the negative terminal of the laser. The scheme utilizes the electric parameter characteristics of the laser per se, namely the difference value of equivalent voltage reduction in two states of the burst mode, as the judgment reference for decision-making. Backlight diodes of the laser are omitted, the cost is saved, the size of the laser is reduced and the product benefits and the convenience in structural design are improved.
Description
Technical field
The present invention relates to a kind of method for supervising and supervisory circuit that is applied to the optical fiber communication laser, specifically be applied in the laser that is operated in burst mode that does not need diode backlight.
Background technology
In Fibre Optical Communication Technology, laser has increasing application with burst mode work.The operating state of this burst mode is the difference that relative continuous mode is done; The laser that is in burst mode work can continuous operation when being authorized to, and when cancellation is authorized, closes, and this is a purpose of dividing the work, avoided signal conflict in order to reach for a long time.Has himself various advantage.So, need monitor in real time, whether be in conducting, pilot signal is used to coordinate the work of other lasers or other circuit to judge it to laser.Common way is utilized the luminous situation of the inner diode monitoring laser device backlight of laser module exactly.So diode backlight is packaged in the laser module just usually as an indispensable element of monitoring laser simultaneously, occupies certain product cost and space.
If the operating state of laser under the monitoring burst mode; Can use not in the mode of diode backlight; For example utilize the electric parameter characteristics of the operating state of laser own, and save this element cost, we find that this is a direction that is worth improvement; Because in the large-scale production, it is very considerable to save the cost-benefit that diode backlight brings; Simultaneously, the laser volume that saves diode backlight is compacter, more helps the internal structure design of communication equipment.
Summary of the invention
Laser to above burst mode work has cost and the space problem that diode backlight brings, and the present invention proposes a kind of laser burst supervisory circuit that need not diode backlight, and its technical scheme is following:
A kind of laser burst supervisory circuit that need not diode backlight, it comprises:
One voltage sample unit comprises a filter circuit, and said filter circuit comprises one and is connected in the voltage sample end on the laser negative terminal drive current branch road and said voltage sample end alternating voltage is filtered into the sampling output of mean value; And
One comparing unit, this comparing unit have be connected with said voltage sample end high resistant one relatively input, be connected in a reference threshold end of a reference threshold voltage and with the compare comparison output of result's output of said relatively input and reference threshold terminal voltage;
Wherein, has a voltage sample resistance between said voltage sample end and the said laser negative terminal.
Some preferred persons as the present technique scheme can have the improvement of following aspect:
In one preferred embodiment, said filter circuit comprises the RC filter network, this RC filter network comprise be connected in said voltage sample end and sampling between the output a filter resistance and be connected in the filter capacitor between said sampling output and the ground.
In one preferred embodiment, said reference threshold end is connected in the threshold setting unit of the said reference threshold voltage of exportable a plurality of difference.
On the basis of a last scheme; In one preferred embodiment; Said threshold setting unit comprise one be connected in connect between Vdd and the ground the divider resistance array, the divider resistance tie point between any two of being connected in the said divider resistance array switches switch arrays through one and switches and be communicated with said reference threshold end.
In one preferred embodiment, said comparing unit comprises a high-speed comparator, and two inputs of this high-speed comparator are respectively said relatively input and reference threshold end; The output of this high-speed comparator is said relatively output.
On the basis of a last scheme; In one preferred embodiment; Said relatively output connects a signal drive circuit; This signal drive circuit comprises that grid is connected in a metal-oxide-semiconductor of said relatively output, is connected in the current-limiting resistance between said metal-oxide-semiconductor drain electrode and Vdd, and said metal-oxide-semiconductor one signal output part of drawing.
As second type of scheme under the same thinking, it can be to comprise:
One voltage sample unit comprises a filter circuit, and said filter circuit comprises one and is connected in the voltage sample end on the laser negative terminal drive current branch road and said voltage sample end alternating voltage is filtered into the sampling output of mean value; And
One comparing unit, this comparing unit have be connected with said voltage sample end one relatively input, be connected in a reference threshold end of a reference threshold voltage and with the compare comparison output of result's output of said relatively input and reference threshold terminal voltage;
Wherein, directly link to each other between said voltage sample end and the said laser negative terminal.
According to above-mentioned basic scheme, a kind of laser burst method for supervising that need not diode backlight, it may further comprise the steps:
A. carry out voltage sample to having comprised its current branch of laser negative terminal that works in burst mode, the sampled point of this sampled voltage is said laser negative terminal;
B., if surpassing the latter, the former judges that then said laser is in enabled with said sampled voltage and a reference threshold voltage ratio; Otherwise judge that laser works is in illegal state.
According to second type of above-mentioned basic scheme, a kind of laser burst method for supervising that need not diode backlight may further comprise the steps:
A. carry out voltage sample to having comprised its current branch of laser negative terminal that works in burst mode, the sampled point of this sampled voltage is its cold end of a sampling resistor of said laser negative terminal series connection;
B., if surpassing the latter, the former judges that then said laser is in enabled with said sampled voltage and a reference threshold voltage ratio; Otherwise judge that laser works is in illegal state.
The present technique scheme comprises circuit/method, and its beneficial effect that brings is:
1. used the electric parameter characteristics of laser itself, i.e. the difference of equivalent pressure drop in the two states of burst mode is as the basis for estimation decision-making.Save laser diode backlight, provided cost savings, dwindled the laser volume, improved the facility of product income and structural design.
2. the scheme that has voltage sample resistance, circuit itself obtains controlled constant, can improve serious forgiveness and reliability, helps more judging.
3. circuit is comparatively succinct reliable, can be fixed in the individual laser package.
Description of drawings
Embodiment is described further the present invention below in conjunction with accompanying drawing:
Fig. 1 is the embodiment of the invention one sketch map;
Fig. 2 is the embodiment of the invention two circuit theory diagrams;
Fig. 3 is the embodiment of the invention three sketch mapes.
Embodiment
Embodiment one:
Like Fig. 1, the embodiment of the invention one sketch map; The positive termination Vdd of laser LD; Its negative terminal inserts the bias current sources Bias of direct current through R9; In common the setting, driver module Drv need insert the drive current loop that makes up laser LD between negative terminal and the ground of laser LD realizing the driving to LD, in this example; Other has a sampling resistor R4 also to be contained within the drive current loop, and the cold end that a voltage sample end 11 is positioned at R4 is drawn in voltage sample unit 10.
Wherein, laser LD is under the setting of current source Bias, when the laser burst enables, with I
BiasDirect current biasing, we are a fixed pressure drop V with the electrical model equivalence of laser LD
ThInternal resistance R with series connection
LdDriver module Drv is with alternating current i simultaneously
ModDrive laser LD is with i
ModMean value be designated as I
Moda Sampling output 13 has connected the comparison input 21 of high resistant, establishes sampled voltage V of sampling output 13 outputs of voltage sample unit 10
On, have according to characteristic with current circuit and voltage sample unit 10:
V
on＝Vdd-(I
Bias+I
moda)*R
ld-I
moda*R4-V
th ..................①
When laser LD was in the burst illegal state, according to the definition of illegal state, laser LD was not luminous, because the I that current source Bias provides
BiasBe zero, the i that while driver module Drv provides
ModAlso be zero, under this state, we are made as V the pressure drop of laser LD
Thoff, it is worth much smaller than V
Th, then at this moment, the voltage V of sampling output 12
OffFor:
V
off＝Vdd-V
thoff ..................②
So, 1. and 2. according to, laser LD burst enable with illegal state between the two, the voltage that voltage sample unit 10 its voltage sample ends 11 are sampled has following difference:
ΔV＝V
off-V
on＝(I
Bias+I
moda)*R
ld+I
moda*R4+V
th-V
thoff
Thus it is clear that, because (I
Bias+ I
Moda) * R
Ld+ I
Moda* R4 belongs to the constant parameter of circuit, and V
Th-V
ThoffValue can reach usually more than the 0.5V, so, at reference threshold voltage V of the reference threshold end of comparing unit 20 22 inputs
Ref, as long as V
RefBe set in V suitably
OffAnd V
OnBetween, comparing unit 20 just can relatively obtain opposite comparative result according to this, just can export this conclusion in order to decision-making from the comparison output 23 of comparing unit 20.
It is thus clear that present embodiment judges that laser LD is in the still illegal state that enables of burst mode, has used the electric parameter characteristics of laser LD itself, i.e. equivalent pressure drop V in the two states of burst mode
ThoffAnd V
ThDifference, as the basis for estimation decision-making.Save laser LD diode backlight, provided cost savings, dwindled the laser volume, improved the facility of product income and structural design.Simultaneously, circuit itself obtains the invariant (I of Δ V
Bias+ I
Moda) * R
Ld+ I
Moda* R4 is controlled constant, can increase Δ V with setting, improves serious forgiveness and reliability, helps more judging.
Embodiment two:
As shown in Figure 2, the embodiment of the invention two circuit theory diagrams.Compare with embodiment one, the RC filter network that filter resistance R6 and filter capacitor C0 make up has been formed the major part of voltage sample unit; High-speed comparator 25 is as the critical piece of comparing unit, and its negative input end is as comparing input 21, and positive input terminal is threshold value end 22. as a reference
Comparing output 23 connections one signal drive circuit; This signal drive circuit comprise grid be connected in compare a metal-oxide-semiconductor M0 of output 23; Has a current-limiting resistance R5 between metal-oxide-semiconductor M0 drain electrode and Vdd; Draw a signal output part TX with metal-oxide-semiconductor M0 drain electrode, be used for judged result is generated suitable current/voltage signal to import the circuit of back level.
It is thus clear that this scheme circuit is simple, and can freely set V
Ref, applicability is stronger.
Embodiment three:
Like Fig. 3, the embodiment of the invention three sketch mapes.It is most of similar with embodiment one, but directly links to each other between voltage sample end 11 and the laser LD negative terminal, does not have sampling resistor between the two.Such circuit structure makes what sampling input 11 received:
ΔV＝V
off-V
on＝(I
Bias+I
moda)*R
ld+V
th-V
thoff
Thus it is clear that,, utilize V equally compared with embodiment one and two
ThAnd V
OffDifference, but, do not had to enlarge the factor R 4 of Δ V, actual when judging, can consider the influence of R4.
The above is merely preferred embodiment of the present invention, so can not limit the scope that the present invention implements according to this, the equivalence of promptly doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (9)
1. laser burst supervisory circuit that need not diode backlight, it is characterized in that: it comprises:
One voltage sample unit comprises a filter circuit, and said filter circuit comprises one and is connected in the voltage sample end on the laser negative terminal drive current branch road and said voltage sample end alternating voltage is filtered into the sampling output of mean value; And
One comparing unit, this comparing unit have be connected with said voltage sample end high resistant one relatively input, be connected in a reference threshold end of a reference threshold voltage and with the compare comparison output of result's output of said relatively input and reference threshold terminal voltage;
Wherein, has a voltage sample resistance between said voltage sample end and the said laser negative terminal.
2. according to the said a kind of laser burst supervisory circuit that need not diode backlight of claim 1; It is characterized in that: said filter circuit comprises the RC filter network, this RC filter network comprise be connected in said voltage sample end and sampling between the output a filter resistance and be connected in the filter capacitor between said sampling output and the ground.
3. according to the said a kind of laser burst supervisory circuit that need not diode backlight of claim 1, it is characterized in that: said reference threshold end is connected in the threshold setting unit of the said reference threshold voltage of exportable a plurality of difference.
According to claim 1 said a kind of need not diode backlight laser burst supervisory circuit, it is characterized in that: said comparing unit comprises a high-speed comparator, two inputs of this high-speed comparator are respectively said relatively input and reference threshold end; The output of this high-speed comparator is said relatively output.
5. laser burst supervisory circuit that need not diode backlight, it is characterized in that: it comprises:
One voltage sample unit comprises a filter circuit, and said filter circuit comprises one and is connected in the voltage sample end on the laser negative terminal drive current branch road and said voltage sample end alternating voltage is filtered into the sampling output of mean value; And
One comparing unit, this comparing unit have be connected with said voltage sample end one relatively input, be connected in a reference threshold end of a reference threshold voltage and with the compare comparison output of result's output of said relatively input and reference threshold terminal voltage;
Wherein, directly link to each other between said voltage sample end and the said laser negative terminal.
6. laser burst method for supervising that need not diode backlight is characterized in that: may further comprise the steps:
A. carry out voltage sample to having comprised its current branch of laser negative terminal that works in burst mode, the sampled point of this sampled voltage is said laser negative terminal;
B., if surpassing the latter, the former judges that then said laser is in enabled with said sampled voltage and a reference threshold voltage ratio; Otherwise judge that laser works is in illegal state.
7. laser burst method for supervising that need not diode backlight is characterized in that: may further comprise the steps:
A. carry out voltage sample to having comprised its current branch of laser negative terminal that works in burst mode, the sampled point of this sampled voltage is its cold end of a sampling resistor of said laser negative terminal series connection;
B., if surpassing the latter, the former judges that then said laser is in enabled with said sampled voltage and a reference threshold voltage ratio; Otherwise judge that laser works is in illegal state.
8. according to the said a kind of laser burst supervisory circuit that need not diode backlight of claim 5; It is characterized in that: said relatively output connects a signal drive circuit; This signal drive circuit comprises that grid is connected in a said relatively metal-oxide-semiconductor of output; Be connected in the current-limiting resistance between drain electrode of said metal-oxide-semiconductor and Vdd, and said metal-oxide-semiconductor one signal output part of drawing.
9. according to the said a kind of laser burst supervisory circuit that need not diode backlight of claim 4; It is characterized in that: said threshold setting unit comprises a divider resistance array, and the divider resistance tie point between any two of being connected in the said divider resistance array switches switch arrays through one and switches the said reference threshold end of connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103882787A CN102594445A (en) | 2011-11-29 | 2011-11-29 | Emergency monitoring method and circuit for laser dispensing with backlight diodes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103882787A CN102594445A (en) | 2011-11-29 | 2011-11-29 | Emergency monitoring method and circuit for laser dispensing with backlight diodes |
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|---|---|
| CN102594445A true CN102594445A (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103882787A Pending CN102594445A (en) | 2011-11-29 | 2011-11-29 | Emergency monitoring method and circuit for laser dispensing with backlight diodes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896102A (en) * | 2020-09-29 | 2020-11-06 | 北京瑞通科悦科技有限公司 | Early warning circuit and method for pulse energy limitation of semiconductor laser |
| CN113687333A (en) * | 2020-05-16 | 2021-11-23 | 北醒（北京）光子科技有限公司 | Transmitting signal state monitoring circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201383812Y (en) * | 2009-01-05 | 2010-01-13 | 宁波环球广电科技有限公司 | Burst mode optical transmitter |
| CN201541332U (en) * | 2009-11-28 | 2010-08-04 | 青岛海信宽带多媒体技术有限公司 | Laser luminous indicating circuit and optical network unit with luminous directive function |
| CN101834666A (en) * | 2010-05-07 | 2010-09-15 | 成都优博创技术有限公司 | Device and method for testing burst optical power of optical network unit |
-
2011
- 2011-11-29 CN CN2011103882787A patent/CN102594445A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201383812Y (en) * | 2009-01-05 | 2010-01-13 | 宁波环球广电科技有限公司 | Burst mode optical transmitter |
| CN201541332U (en) * | 2009-11-28 | 2010-08-04 | 青岛海信宽带多媒体技术有限公司 | Laser luminous indicating circuit and optical network unit with luminous directive function |
| CN101834666A (en) * | 2010-05-07 | 2010-09-15 | 成都优博创技术有限公司 | Device and method for testing burst optical power of optical network unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687333A (en) * | 2020-05-16 | 2021-11-23 | 北醒（北京）光子科技有限公司 | Transmitting signal state monitoring circuit |
| CN111896102A (en) * | 2020-09-29 | 2020-11-06 | 北京瑞通科悦科技有限公司 | Early warning circuit and method for pulse energy limitation of semiconductor laser |
| CN111896102B (en) * | 2020-09-29 | 2020-12-11 | 北京瑞通科悦科技有限公司 | Early warning circuit and method for pulse energy limitation of semiconductor laser |
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Application publication date: 20120718 |