CN105187118B - Terminal device and its hair optical detection circuit - Google Patents
Terminal device and its hair optical detection circuit Download PDFInfo
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- CN105187118B CN105187118B CN201510545280.9A CN201510545280A CN105187118B CN 105187118 B CN105187118 B CN 105187118B CN 201510545280 A CN201510545280 A CN 201510545280A CN 105187118 B CN105187118 B CN 105187118B
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Abstract
The invention discloses a kind of terminal device and its long luminescence detection circuit, the circuit includes：Negative circuit, to export high level from its output end when the negative terminal of the laser light emitting light source is low level；Low level is exported when the negative terminal of the laser light emitting light source is high-impedance state；Leadage circuit is filtered, after the output end of the negative circuit exports high level and maintains setting time section, high level is exported from its output end；Alarm signal triggers circuit, to the alarm signal when the output end of the filtering leadage circuit exports high level, to be lighted from the length of its output end output laser.Long luminescence detection circuit of the present invention is reduced product cost, saves PCB layout space and reduces the purpose of software development workload estimate by simple discrete device to reach.
Description
The application is on 09 26th, 2012 entitled " terminal device and its long luminescence detection circuits " proposed
The divisional application of Chinese invention patent application 201210363668.3.
Technical field
The present invention relates to Fibre Optical Communication Technology, more particularly to a kind of terminal device and its hair optical detection circuit.
Background technology
Current domestic market and international market, the fiber optic communication direction merged with a large bandwidth and at a high rate with multiple business
Have begun to apply；In numerous solutions, the appearance of fiber to the home (FTTH) is considered as the ultimate solution of broadband access
Certainly scheme.Domestic market large-area applications.
The product for being currently based on FTTH is laid on a large scale, due to EPON（Ethernet Passive Optical
Network, Ethernet passive optical network）Or GPON（Gigabit Passive Optical Network, G bit passive light
Network）For P2MP access infrastructure, bandwidth is provided for multiple terminal devices by a port of local side apparatus；Terminal device is sent
Data take up data link using time-sharing polling mode, and remaining terminal device is then waited for；If some terminal
There is long failure light emission in equipment, then the terminal device can be caused to take up data link for a long time so that the local side apparatus port
Under other terminal devices can not use up data link carry out normal work, bring loss to enterprise and user.
Therefore, long luminescence detection circuit can be set in terminal device, and its Cleaning Principle is as shown in figure 1, long luminous detection
Circuit occurs after long failure light emission to the master of terminal device to the luminous situation of laser in detection terminal equipment detecting
Control chip and send alarm signal, main control chip is after the alarm signal of long luminescence detection circuit is received, to laser control electricity
Road sends control signal, and laser control circuit closes the transmitting terminal of laser according to the control signal, and laser stops lighting,
So as to stopped occupancy of the terminal device to up data link, other terminal devices under local side apparatus port can continue
Normal use up data link.
At present, the long luminescence detection circuit in terminal device can be realized by complex logic circuit and software, but should
Method is realized due to needing using logic chip, causes production cost higher；
Or the long luminescence detection circuit in terminal device is also contemplated for by real with the chip with detection function
It is existing, but higher chip design cost can be produced.
The content of the invention
The embodiment provides a kind of terminal device and its long luminescence detection circuit, terminal is realized at lower cost
The luminous detection of the length of equipment.
According to an aspect of the invention, there is provided a kind of long luminescence detection circuit, including：
Negative circuit, its input are connected with the negative terminal of the laser light emitting light source in laser, to be sent out in the laser
When the negative terminal for penetrating light source is low level high level is exported from its output end；It is high-impedance state in the negative terminal of the laser light emitting light source
When export low level；
Leadage circuit is filtered, its input is connected with the output end of the negative circuit, in the negative circuit
After output end exports high level and maintains setting time section, high level is exported from its output end；
Alarm signal triggers circuit, its input is connected with the output end of the filtering leadage circuit, in the filter
During the output end output high level of ripple leadage circuit, the alarm signal luminous from the length of its output end output laser.
It is preferred that the filtering leadage circuit specifically includes：Electric capacity C1, resistance R1, diode D1；
Wherein, input and the output end phase of the negative circuit of the negative terminal of the D1 as the filtering leadage circuit
Even, the anode of the D1 is connected with the positive pole of the C1, the negative pole ground connection of the C1；The R1 is in parallel with the D1；It is described
Output end of the C1 positive pole as the filtering leadage circuit.
Further, the filtering leadage circuit also includes：The resistance being serially connected between C1 and D1.
The filtering leadage circuit also includes：The electric capacity in parallel with the C1.
Further, the circuit also includes：Be serially connected with the alarm signal triggers circuit with it is described filtering leadage circuit it
Between resistance and diode；Wherein, the negative terminal of the diode is connected with the output end of the filtering leadage circuit.
Wherein, the negative circuit is realized especially by metal-oxide-semiconductor.
The negative circuit specifically includes：Metal-oxide-semiconductor and the resistance R303 and R304 of series connection, wherein, the grid of the metal-oxide-semiconductor
Input as the negative circuit is connected with the negative terminal of the laser light emitting light source, S poles and the power supply phase of the metal-oxide-semiconductor
Even, the D poles of the metal-oxide-semiconductor are connected to ground by the resistance R303 and R304 of series connection, and the tie point between resistance R303, R304 is made
For the output end of the negative circuit；Or
The negative circuit specifically includes：Metal-oxide-semiconductor and resistance R403, wherein, the grid of the metal-oxide-semiconductor is as described anti-phase
The input of circuit is connected with the negative terminal of the laser light emitting light source, and the S poles of the metal-oxide-semiconductor pass through resistance R403 and power supply phase
Even, the D poles of the metal-oxide-semiconductor are connected to ground, the output end of the S poles of the metal-oxide-semiconductor as the negative circuit；Or
The negative circuit specifically includes：Metal-oxide-semiconductor and resistance R503, R504, wherein, the grid of the metal-oxide-semiconductor is as institute
The input for stating negative circuit is connected with the negative terminal of the laser light emitting light source, and the S poles of the metal-oxide-semiconductor pass through resistance R503 and electricity
Source is connected, and the D poles of the metal-oxide-semiconductor are connected to ground by resistance R504, and the D poles of the metal-oxide-semiconductor are as the defeated of the negative circuit
Go out end；Or
The negative circuit specifically includes：Metal-oxide-semiconductor and resistance R601, R602, R603, R604, wherein, the S of the metal-oxide-semiconductor
Pole is connected by the resistance R603 and R604 of parallel connection with power supply, and the D poles of the metal-oxide-semiconductor are connected by the resistance R601 and R602 of parallel connection
With being connected to, output end of the D poles of the metal-oxide-semiconductor as the negative circuit.
Wherein, the alarm signal triggers circuit is realized by metal-oxide-semiconductor or triode.
The alarm signal triggers circuit specifically includes triode and resistance R701, wherein, the base stage of the triode is made
It is connected for the input of the alarm signal triggers circuit with the output end of the filtering leadage circuit, the current collection of the triode
Pole is connected to power supply by resistance R701, and the emitter stage of the triode is connected to ground, and the colelctor electrode of the triode is as institute
State the output end of alarm signal triggers circuit；Or
The alarm signal triggers circuit specifically includes metal-oxide-semiconductor and resistance R801, wherein, the base stage conduct of the metal-oxide-semiconductor
The input of the alarm signal triggers circuit is connected with the output end of the filtering leadage circuit, the colelctor electrode of the metal-oxide-semiconductor
Power supply is connected to by resistance R801, the emitter stage of the metal-oxide-semiconductor is connected to ground, and the colelctor electrode of the metal-oxide-semiconductor is as the announcement
The output end of alert signal triggers circuit.
According to another aspect of the present invention, there is provided a kind of terminal device, including：
Drive circuit and laser, the drive circuit drive the laser in the laser to send out according to the electric signal of reception
Penetrate light source transmitting laser；
Long luminescence detection circuit as described above, to when detecting the laser light emitting light source long hair light, output is accused
Alert signal；
Main control chip, to the alarm signal exported according to the long luminescence detection circuit, the control of output shut-off laser
Signal processed；
Laser power supply control circuit, to the control letter of the shut-off laser exported according to the main control chip
Number, turn off the power supply of the laser.
It is preferred that the equipment is specially in Ethernet passive optical network EPON or gigabit passive optical network GPON networks
Optical network unit ONU；Or
The equipment is specially the ONT Optical Network Terminal ONT in EPON or GPON networks.
It is the inspection that long hair light function can be achieved using several simple discrete devices in the technical scheme of the embodiment of the present invention
Survey, circuit is easy to use, and the circuit take layout area it is very small, advantageously reduce production cost and exploitation into
This, the complexity of software also greatly reduces, and can meet the different demands of client.
Brief description of the drawings
Fig. 1 is the principle schematic for grow luminous fault detect in the terminal device of prior art；
Fig. 2 is the internal circuit block diagram in the terminal device of the embodiment of the present invention.
Fig. 3 is the laser internal circuit schematic diagram of the embodiment of the present invention；
Fig. 4 is the long luminescence detection circuit block diagram of the embodiment of the present invention；
Fig. 5 a, the negative circuit schematic diagram that 5b, 5c, 5d are the embodiment of the present invention；
Fig. 6 a, 6b are the filtering leadage circuit schematic diagram of the embodiment of the present invention；
Fig. 7 a, 7b are the alarm signal triggers circuit schematic diagram of the embodiment of the present invention；
Fig. 8 is the long luminescence detection circuit schematic diagram of the embodiment of the present invention.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, referring to the drawings and preferred reality is enumerated
Example is applied, the present invention is described in more detail.However, it is necessary to illustrate, many details listed in specification are only to be
Reader is set to have a thorough explanation to the one or more aspects of the present invention, even without these specific details can also
Realize the aspects of the invention.
The term such as " module " used in this application, " system " is intended to include the entity related to computer, such as but unlimited
In hardware, firmware, combination thereof, software or executory software.For example, module can be, it is not limited to：Processing
The process run on device, processor, object, executable program, thread, program and/or the computer performed.
In technical scheme provided in an embodiment of the present invention, product cost, section are reduced to reach by simple discrete device
Province PCB layout space and the purpose for reducing software development workload estimate, and pass through existing MAC chips in terminal device（Or
Main control chip）The signal of long luminescence detection circuit output is received, optical module transmitting terminal electricity is turned on and off according to the signal of reception
Source.
The internal circuit block diagram of terminal device provided in an embodiment of the present invention, as shown in Fig. 2 including：Laser 201 and its
Drive circuit 206, main control chip 202, long luminescence detection circuit 203, laser power supply control circuit 205.
In general, after the drive circuit 206 in terminal device receives the electric signal for needing to send, according to the electricity of reception
Laser light emitting light source transmitting laser in signal driving laser 201.Specifically, the drive circuit 206 in terminal device receives
To after the electric signal for needing to send, according to laser light emitting light source of the electric signal of reception into laser 201（LD in Fig. 3）Hair
Modulated signal is sent, to drive the luminous of laser light emitting light source.
The anode of the laser light emitting light source of laser 201 is connected with power supply, either by resistance or pass through inductance with electricity
Source is connected；So as to which power supply provides high voltage to the anode of laser light emitting light source.Drive circuit 206 produces according to the electric signal of reception
Raw corresponding modulation signal.The modulation signal end of drive circuit 206 and the negative terminal phase of the laser light emitting light source of laser 201
Even, or, the modulation signal end of drive circuit 206 is connected by resistance with the negative terminal of the laser light emitting light source of laser 201,
To provide modulation signal for laser light emitting light source：If the modulation signal end of drive circuit 206 produces low level, laser
Launch light source conducting, electric current flows to drive circuit 206 from laser light emitting light source, and laser light emitting light source lights；If drive circuit 206
Modulation signal end be in high-impedance state, laser light emitting light source is in cut-off state, not lighted.In addition, drive circuit 206 is also
The bias current of laser light emitting light source work is provided for laser light emitting light source.
The input of long luminescence detection circuit 203 is connected with the negative terminal of the laser light emitting light source in laser 201, to
When detecting the laser light emitting light source long hair light of laser 201, i.e., when long failure light emission occurs in laser light emitting light source, from its output
Hold outputting alarm signal.
The output end of long luminescence detection circuit 203 is connected with main control chip 202, and main control chip 202 is gone back and laser power supply
Control circuit 205 is connected, the alarm signal that main control chip 202 exports according to the output end of long luminescence detection circuit 203, to laser
The control signal of the output shut-off laser of device power control circuit 205.
Laser power supply control circuit 205 is closed to the control signal of the shut-off laser exported according to main control chip 202
The power supply of disconnected laser 201, so as to which laser 201 stops continuing to light.Laser power supply control circuit 205 can use existing skill
Laser power supply control circuit in art, for example pass through MOS（Metal Oxide Semiconductor, metal oxide are partly led
Body）Pipe etc. controls the break-make of the power supply of laser 201, and here is omitted.
The physical circuit of long luminescence detection circuit 203 as shown in figure 4, including：Negative circuit 401, filtering leadage circuit
402nd, alarm signal triggers circuit 403.
The input of negative circuit 401 is the input of long luminescence detection circuit 203, itself and in laser 201 swash
The negative terminal of light transmitting light source is connected, and during laser light emitting light source conducting, lighting, the input of negative circuit 401 is low
Level.
Negative circuit 401 is in its output end output level opposite with its input；Thus, in negative circuit 401
When input is low level, the output end output high level of negative circuit 401；The input of negative circuit 401 be high level or
During high-impedance state, the output end output low level of negative circuit 401.Obviously, to reach the inverter functionality, those skilled in the art
Negative circuit 401 can be realized using a variety of circuits.For example, it can be realized as shown in Fig. 5 a, 5b, 5c using metal-oxide-semiconductor anti-phase
Circuit 401.
In Fig. 5 a, 5b, 5c, input of the grid as negative circuit 401 of metal-oxide-semiconductor and the laser in laser 201
The negative terminal of transmitting light source is connected；The S poles of metal-oxide-semiconductor（Source electrode）It is connected with power supply, or, the S poles of metal-oxide-semiconductor pass through resistance and power supply phase
Even；The D poles of metal-oxide-semiconductor（Drain electrode）Ground is connected to, or, the D poles of metal-oxide-semiconductor are connected to ground by resistance.
In Fig. 5 a, the S poles of metal-oxide-semiconductor are connected with power supply, and the D poles of metal-oxide-semiconductor are connected by resistance R303, R304 of two series connection
To ground, output end of the tie point as negative circuit 401 between resistance R303, R304；
In Fig. 5 b, the S poles of metal-oxide-semiconductor are connected by resistance R403 with power supply, and the D poles of metal-oxide-semiconductor are connected to ground, the S poles of metal-oxide-semiconductor
Output end as negative circuit 401；
In Fig. 5 c, the S poles of metal-oxide-semiconductor are connected by resistance R503 with power supply, and the D poles of metal-oxide-semiconductor are connected to by resistance R504
Ground, the output end of the D poles of metal-oxide-semiconductor as negative circuit 401；
In Fig. 5 d, the S poles of metal-oxide-semiconductor are connected by the resistance R603 and R604 of parallel connection with power supply, and the D poles of metal-oxide-semiconductor pass through simultaneously
The resistance R601 and R602 of connection are connected to ground, the output end of the D poles of metal-oxide-semiconductor as negative circuit 401.
When the negative terminal of laser light emitting light source is low level, metal-oxide-semiconductor conducting, the D poles of metal-oxide-semiconductor are as negative circuit 401
Output end exports high level；When the negative terminal of laser light emitting light source is for high level or in high-impedance state, metal-oxide-semiconductor cut-off, metal-oxide-semiconductor
D poles export low level.
Filtering leadage circuit 402 input be connected with the output end of negative circuit 401, filter leadage circuit 402 to
In its input end in high level and after maintaining setting time section, high level is exported from its output end；Otherwise, vent discharge is filtered
The output end output low level on road 402.That is, the output end in negative circuit 401 exports high level, and maintain setting
After period, filtering leadage circuit 402 exports high level from its output end.Filter physical circuit such as Fig. 6 a of leadage circuit 402
It is shown, including：Electric capacity C1, resistance R1, diode D1.
Diode D1 negative terminal is connected as the input of filtering leadage circuit 402 with the output end of negative circuit 401, D1
Anode be connected with electric capacity C1 positive pole, electric capacity C1 negative pole ground connection；Resistance R1 is in parallel with diode D1.Electric capacity C1 positive pole
Output end as filtering leadage circuit 402.Its operation principle is：It is anti-phase during laser light emitting light source conducting, lighting
The input of circuit 401 is low level, the output end output high level of negative circuit 401, then filters the input of leadage circuit 402
Therefore end, is also at high level due to being connected with the output end of negative circuit 401；That is diode D1 negative terminal and resistance R1
One end is in high level, so as to be charged by resistance R1 to electric capacity C1.If the laser of terminal device is normal operating conditions,
For laser light emitting light source due to sending data, its laser launched is flicker state, i.e., 0,1 alternating state；Therefore, swashing
When light device is that normal operating conditions issues light, the negative terminal of its laser light emitting light source is that low level is alternately present with high-impedance state；
So, when high-impedance state occurs in the negative terminal of laser light emitting light source, negative circuit 401 will export low level；Now,
The input for filtering leadage circuit 402 is also low level therewith, and the electric charge accumulated on electric capacity C1 is then let out by diode D1
Put；
Therefore, during being lighted under above-mentioned laser is normal operating conditions, charge accumulation on electric capacity C1 to one
Determine degree to be released, it is thus impossible to reach certain magnitude of voltage, i.e., can not reach high level.
If there is long luminous failure in laser, then the negative terminal of laser light emitting light source will appear from prolonged low level
Long-time is exported high level by state, negative circuit 401, and electric capacity C1 will be charged for a long time；In filtering leadage circuit 402 at it
In high level and after maintaining setting time section, the electric charge accumulated on electric capacity C1 is up to certain voltage and reached input end
High level, high level is exported as the output end of filtering leadage circuit 402 so as to electric capacity C1 positive pole, and then trigger alarm signal
The outputting alarm signal of triggers circuit 403.
It is preferred that filtering leadage circuit 402 also includes resistance R2, it is serially connected between electric capacity C1 and diode D1；This
Outside, filtering leadage circuit 402 also includes electric capacity C2, and it is in parallel with electric capacity C1；Physical circuit figure is as shown in Figure 6 b.This area skill
Art personnel can set above-mentioned setting time section according to actual conditions, regulation resistance R1 or R2, or electric capacity C1 or C2
Length.
Specifically, the input of alarm signal triggers circuit 403 is connected with filtering the output end of leadage circuit 402, filters
The high level of the output end output of leadage circuit 402 is triggering the outputting alarm signal of alarm signal triggers circuit 403.Namely
Say, when the output end for filtering leadage circuit 402 exports high level, alarm signal triggers circuit 403 exports institute from its output end
State the luminous alarm signal of the length of laser.
Specifically, alarm signal triggers circuit 403 can be realized by triode or metal-oxide-semiconductor, as shown in Fig. 7 a, 7b.
Circuit shown in Fig. 7 a is in alarm signal triggers circuit with triode realization：The base stage of triode triggers as alarm signal
The input of circuit 403 is connected with filtering the output end of leadage circuit 402, and the colelctor electrode of triode is connected to by resistance R701
Power supply, the emitter stage of triode are connected to ground, the output end of the colelctor electrode of triode as alarm signal triggers circuit 403；When
The output end output high level of leadage circuit 402 is filtered, triode ON, the colelctor electrode of triode is to export low level as announcement
Alert signal；If the level of the output end output of filtering leadage circuit 402 does not reach high level, triode ends, triode
Colelctor electrode exports high level to be designated as non-alarm signal.
Similarly, can be with the metal-oxide-semiconductor realization shown in Fig. 7 b in alarm signal triggers circuit：The base stage conduct of metal-oxide-semiconductor
The input of alarm signal triggers circuit 403 is connected with filtering the output end of leadage circuit 402, and the colelctor electrode of metal-oxide-semiconductor passes through electricity
Resistance R801 is connected to power supply, and the emitter stage of metal-oxide-semiconductor is connected to ground, and the colelctor electrode of metal-oxide-semiconductor is as alarm signal triggers circuit 403
Output end.
It is preferred that alarm signal triggers circuit 403 and filtering leadage circuit 402 between can also concatenate a resistance R5 and
Diode D2, as shown in Figure 8.Wherein, diode D2 negative terminal is connected with filtering the output end of leadage circuit 402.
Above-mentioned terminal device can be specifically the ONU in EPON or GPON networks（Optical Network Unit, light
NE）, or the ONT in EPON or GPON networks（Optical Network Termination, ONT Optical Network Terminal）.
In conventional technical scheme, long luminescence detection circuit is made up of digital logic portion and control software, Neng Gougen
According to change control software is needed, the detection of long lighting function is realized, but due to needing multiple Digital Logical Circuits and exploitation control
Software processed, increase the production cost and design cost of product；
And in the technical scheme of the embodiment of the present invention, using several simple discrete devices, such as resistance, electric capacity, two poles
Pipe, metal-oxide-semiconductor etc. are the detection that long hair light function can be achieved, and circuit is easy to use, and circuit occupancy layout area is very small,
Production cost and development cost are advantageously reduced, the complexity of software also greatly reduces, and can meet the different need of client
Ask.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
- It is defeated from its in the long failure light emission of the laser light emitting light source that detects laser 1. a kind of long luminescence detection circuit Go out to hold outputting alarm signal, including：Negative circuit, the negative circuit export high when the negative terminal of the laser light emitting light source is low level from its output end Level；Low level is exported when the negative terminal of the laser light emitting light source is high-impedance state；Leadage circuit, including electric capacity C1, resistance R1, diode D1 are filtered, wherein, the negative terminal of the D1 is released as the filtering The input of circuit is connected with the output end of the negative circuit, and the anode of the D1 is connected with the positive pole of the C1, the C1 Negative pole ground connection；The R1 is in parallel with the D1；Output end of the positive pole of the C1 as the filtering leadage circuit, it is described Filtering leadage circuit is after the output end of the negative circuit exports high level and maintains setting time section, from its output end Export high level；Alarm signal triggers circuit, the alarm signal triggers circuit export high level in the output end of the filtering leadage circuit When, the alarm signal luminous from the length of its output end output laser.
- 2. circuit as claimed in claim 1, it is characterised in that the filtering leadage circuit also includes：Be serially connected with C1 and D1 it Between resistance.
- 3. circuit as claimed in claim 2, it is characterised in that the filtering leadage circuit also includes：It is in parallel with the C1 Electric capacity.
- 4. circuit as claimed in claim 3, it is characterised in that also include：It is serially connected with the alarm signal triggers circuit and institute State the resistance and diode between filtering leadage circuit；Wherein, the output of the negative terminal of the diode and the filtering leadage circuit End is connected.
- 5. circuit as claimed in claim 1, it is characterised in that the negative circuit is realized especially by metal-oxide-semiconductor.
- 6. circuit as claimed in claim 5, it is characterised in that the negative circuit specifically includes：Metal-oxide-semiconductor and the resistance of series connection R303 and R304, wherein, the grid of the metal-oxide-semiconductor is as the input of the negative circuit and bearing for the laser light emitting light source End is connected, and the S poles of the metal-oxide-semiconductor are connected with power supply, and the D poles of the metal-oxide-semiconductor are connected to by the resistance R303 and R304 of series connection Ground, output end of the tie point as the negative circuit between resistance R303, R304；OrThe negative circuit specifically includes：Metal-oxide-semiconductor and resistance R403, wherein, the grid of the metal-oxide-semiconductor is as the negative circuit Input be connected with the negative terminal of the laser light emitting light source, the S poles of the metal-oxide-semiconductor are connected by resistance R403 with power supply, institute The D poles for stating metal-oxide-semiconductor are connected to ground, the output end of the S poles of the metal-oxide-semiconductor as the negative circuit；OrThe negative circuit specifically includes：Metal-oxide-semiconductor and resistance R503, R504, wherein, the grid of the metal-oxide-semiconductor is as described anti- The input of circuitry phase is connected with the negative terminal of the laser light emitting light source, and the S poles of the metal-oxide-semiconductor pass through resistance R503 and power supply phase Even, the D poles of the metal-oxide-semiconductor are connected to ground by resistance R504, the output end of the D poles of the metal-oxide-semiconductor as the negative circuit； OrThe negative circuit specifically includes：Metal-oxide-semiconductor and resistance R601, R602, R603, R604, wherein, the grid of the metal-oxide-semiconductor Input as the negative circuit is connected with the negative terminal of the laser light emitting light source, and the S poles of the metal-oxide-semiconductor pass through parallel connection Resistance R603 and R604 are connected with power supply, and the D poles of the metal-oxide-semiconductor are connected to ground by the resistance R601 and R602 of parallel connection, described Output end of the D poles of metal-oxide-semiconductor as the negative circuit.
- 7. circuit as claimed in claim 1, it is characterised in that the alarm signal triggers circuit passes through metal-oxide-semiconductor or triode Realize.
- 8. circuit as claimed in claim 7, it is characterised in that the alarm signal triggers circuit specifically includes triode and electricity R701 is hindered, wherein, the input and the filtering vent discharge of the base stage of the triode as the alarm signal triggers circuit The output end on road is connected, and the colelctor electrode of the triode is connected to power supply by resistance R701, and the emitter stage of the triode connects With being connected to, output end of the colelctor electrode of the triode as the alarm signal triggers circuit；OrThe alarm signal triggers circuit specifically includes metal-oxide-semiconductor and resistance R801, wherein, described in the base stage conduct of the metal-oxide-semiconductor The input of alarm signal triggers circuit is connected with the output end of the filtering leadage circuit, and the colelctor electrode of the metal-oxide-semiconductor passes through Resistance R801 is connected to power supply, and the emitter stage of the metal-oxide-semiconductor is connected to ground, and the colelctor electrode of the metal-oxide-semiconductor is as the alarm letter The output end of number triggers circuit.
- 9. a kind of terminal device, including：Drive circuit and laser, the drive circuit drive the Laser emission light in the laser according to the electric signal of reception Launch laser in source；Long luminescence detection circuit as described in claim 1-8 is any, to detect that the laser light emitting light source length is luminous When, outputting alarm signal；Main control chip, to the alarm signal exported according to the long luminescence detection circuit, the control letter of output shut-off laser Number；Laser power supply control circuit, to the control signal of the shut-off laser exported according to the main control chip, close The power supply of the disconnected laser.
- 10. equipment as claimed in claim 9, it is characterised in that the equipment be specially Ethernet passive optical network EPON or Optical network unit ONU in gigabit passive optical network GPON networks；OrThe equipment is specially the ONT Optical Network Terminal ONT in EPON or GPON networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510545280.9A CN105187118B (en) | 2012-09-26 | 2012-09-26 | Terminal device and its hair optical detection circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210363668.3A CN102938671B (en) | 2012-09-26 | 2012-09-26 | Terminal equipment and long luminescence detection circuit thereof |
| CN201510545280.9A CN105187118B (en) | 2012-09-26 | 2012-09-26 | Terminal device and its hair optical detection circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210363668.3A Division CN102938671B (en) | 2012-09-26 | 2012-09-26 | Terminal equipment and long luminescence detection circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN105187118A CN105187118A (en) | 2015-12-23 |
| CN105187118B true CN105187118B (en) | 2017-11-17 |
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| CN201210363668.3A Active CN102938671B (en) | 2012-09-26 | 2012-09-26 | Terminal equipment and long luminescence detection circuit thereof |
| CN201510545280.9A Active CN105187118B (en) | 2012-09-26 | 2012-09-26 | Terminal device and its hair optical detection circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210363668.3A Active CN102938671B (en) | 2012-09-26 | 2012-09-26 | Terminal equipment and long luminescence detection circuit thereof |
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| CN108132420A (en) * | 2017-12-08 | 2018-06-08 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of portable string mends sensor detecting device |
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| CN101710847A (en) * | 2009-12-09 | 2010-05-19 | 中兴通讯股份有限公司 | Failure detection and control method of optical network unit and optical network unit |
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| CN101969343A (en) * | 2010-08-26 | 2011-02-09 | 成都优博创技术有限公司 | Method and device for abnormal continuous luminous detection, report and turn-off |
| CN102075244A (en) * | 2010-12-30 | 2011-05-25 | 北京格林伟迪科技有限公司 | Method for diagnosing constant optical network units in Ethernet passive optical network |
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| CN101710847A (en) * | 2009-12-09 | 2010-05-19 | 中兴通讯股份有限公司 | Failure detection and control method of optical network unit and optical network unit |
| CN101969343A (en) * | 2010-08-26 | 2011-02-09 | 成都优博创技术有限公司 | Method and device for abnormal continuous luminous detection, report and turn-off |
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| CN105187118A (en) | 2015-12-23 |
| CN102938671B (en) | 2015-08-12 |
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