CN202737870U - Optical network unit optical module - Google Patents
Optical network unit optical module Download PDFInfo
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- CN202737870U CN202737870U CN 201220356303 CN201220356303U CN202737870U CN 202737870 U CN202737870 U CN 202737870U CN 201220356303 CN201220356303 CN 201220356303 CN 201220356303 U CN201220356303 U CN 201220356303U CN 202737870 U CN202737870 U CN 202737870U
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Abstract
The utility model discloses an optical network unit optical module. The optical network unit optical module comprises a response current detection module and a micro-program control unit MCU, wherein a current input end of the response current detection module is connected with a cathode of a photodiode of the optical module, the response current detection module is used for detecting response current outputted by the photodiode and outputting corresponding voltage from a voltage output end according to the response current, a voltage input end of the micro-program control unit MCU is connected with a voltage output end of the response current detection module, and the micro-program control unit MCU is used for detecting outputted voltage of the response current detection module, determining whether an effective optical signal is received or not according to the detected voltage and controlling optical detection signal output according to the determined result. Whether the effective optical signal is received or not is determined according to the response current generated by the photodiode, and the response current generated by the photodiode is not influenced by a power supply or other interference source, so optical detection signal output accuracy is greatly improved.
Description
Technical field
The utility model relates to Fibre Optical Communication Technology, relates in particular to a kind of optical network unit optical module.
Background technology
Present domestic market and international market have begun to use with the optical fiber communication direction that multiple business is merged with a large bandwidth and at a high rate; In numerous solutions, the appearance that Fiber to the home (FTTH) just is considered to the ultimate solution of broadband access.The domestic market is large-area applications.
And in the numerous schemes of FTTH, PON(EPON wherein) receive much concern again, become the light access way of present main flow.The PON technology has experienced APON, BPON EPON, GPON up till now in several years.And along with the development of the universal and broadband access technology of ethernet technology in metropolitan area network, the above broadband P ON technology of the more concerns of people 1Gbit/s, i.e. EPON, GPON.The full name of GPON is Gigabit-capable PON, the EPON of gigabit progression namely, its transmission rate maximum can reach 2.5Gbps, and supports multiple business, comprises ATM, Ethernet, TDM, CATV pays attention to multi-service, can be described as the most perfect PON network technology of present function, also be a kind of very economical, towards the network access mode in broadband.
The network of PON is laid more and more at present.ONU(optical net unit in the PON network, optical network unit) optical module is mainly used in ONU BOX(ONU box) on the equipment, concerning the system equipment merchant, for application and the cost consideration in different markets, selected BOX chip solution is also different, and also each is variant for circuit design.Therefore, exist in the PCB design of BOX and produce very strong power supply noise and interference, in reality test, the ONU optical module can occur and the SD problem in the BOSX application process, occur, i.e. the problem of light detecting signal output error, the LOS/SD signal that causes exporting daps or does not jump.
Comprise laser emission element and laser pick-off unit in the ONU optical module, the laser pick-off unit comprises ROSA(Receiver Optical Subassembly, optical fiber receive module) and amplitude limiting amplifier circuit; Perhaps comprise BOSA(Bidirectional Optical Subassembly, bi-directional light assembly in the ONU optical module), BOSA can carry out Laser emission and reception.Photodiode and TIA have been generally included among ROSA or the BOSA.Fig. 1 illustrates the light detecting signal output circuit in the ONU optical module of prior art, wherein, after photodiode (APD) detects light signal, TIA(Tranimpedance Amplifier, trans-impedance amplifier) will export corresponding differential electric signal; This differential signal is sent to differential amplifier 101, and the threshold voltage of the output of differential amplifier 101 and DAC102 output is imported into comparator 103 and compares; The comparative result of comparator 103 output is as light detecting signal, i.e. the LOS/SD signal.ONU optical module thus signal judges whether that needing to open the Laser emission function communicates by letter with local side.
The principle that foregoing circuit carries out the light detection is: if ROSA detects the light signal of certain power, then the TIA among the ROSA can export the poor differential signal of certain amplitude, and the amplitude difference of differential signal is larger, and then the power of the light signal of explanation reception is larger; The amplitude difference of differential signal is less, illustrates that the power of the light signal that receives is less; If the amplitude difference of differential signal is zero, then show without light signal.The differential signal of TIA output is fed to differential amplifier 101, the voltage of differential amplifier 101 outputs is relevant with the amplitude difference of the differential signal of input, generally speaking, have proportional relationship: the amplitude difference of the differential signal of input is larger, and the voltage of differential amplifier 101 outputs is higher.The voltage of differential amplifier 101 outputs and threshold voltage are imported into comparator 103 and compare; If the voltage of differential amplifier 101 outputs is higher than threshold voltage, then explanation receives effective light signal, and the light detecting signal indication of output detects the efficient light signal; If the voltage of differential amplifier 101 outputs is lower than threshold voltage, then explanation does not receive effective light signal, and the light detecting signal indication of output does not detect the efficient light signal.If light detecting signal is specially SD(Signal Detect, the input indication) signal, when then SD was high level, expression received effective light signal; When SD was low level, expression did not receive effective light signal.If light detecting signal is specially LOS(Loss of Signal, the signal loss detection indication) signal, when then LOS was high level, expression did not receive effective light signal; When LOS was low level, expression received effective light signal.In actual applications, in order to prevent concussion, general LOS/SD alarm and go between the alarm certain sluggishness to be set is such as 2～4dB.After surpassing default thresholding, the amplitude that detects produces the LOS/SD alarm.
Yet the unusual phenomenon of LOS/SD alarm often appears in the circuit of the output light detecting signal of prior art, i.e. the phenomenon of light detecting signal output error: do not receive effective light signal, the output indication has the light detecting signal of light signal; Receive effective light signal and but export indication without the light detecting signal of light signal.Inventor of the present utility model is as follows to this phenomenon analysis:
For example, if with the threshold value setting 20mV of LOS, and the overshoot of the differential signal of TIA output has 45mV usually, so LOS/SD will alarm; Namely work as differential signal difference (A-B) and surpass 20mV, be exactly that LOS/SD has a small-pulse effect and show, and do not received effective light signal this moment, thereby caused erroneous judgement, exported and indicated the light detecting signal that receives effective light signal.
In addition, the noise amplitude that exists when BOX plank power source and ground surpasses 50mV, and then this noise can pass through power supply, and TIA introduces by module, causes unglazed LOS/SD to have wild effect.
Therefore, erroneous judgement can appear in the light detecting signal output intent of prior art, and causes the phenomenon of light detecting signal output error.
The utility model content
Embodiment of the present utility model provides a kind of optical network unit optical module, in order to improve the accuracy of light detecting signal output.
According to an aspect of the present utility model, a kind of optical network unit optical module is provided, comprising:
The negative electrode of the photodiode in the response current detection module, its current input terminal and described optical module links to each other, and in order to detecting the response current of described photodiode output, and exports corresponding voltage according to described response current from its voltage output end;
Mini program controlling unit MCU, its voltage input end links to each other with the voltage output end of described response current detection module, in order to detect the voltage of described response current detection module output, judges whether to receive effective light signal according to the voltage that detects; And according to the output of judged result control light detecting signal.
Preferably, described response current detection module specifically comprises: current mirror circuit and sampling resistor;
The current input terminal of described current mirror circuit links to each other with the negative electrode of described photodiode, and the image current output of described current mirror circuit is received power supply ground by described sampling resistor; The image current output of described current mirror circuit and the tie point of described sampling resistor are the voltage output end of described response current detection module.
Described MCU judges whether to receive effective light signal according to the voltage that detects and is specially:
If greater than the first threshold of setting, then judging, the voltage that described MCU determines to detect receives effective light signal; If less than the Second Threshold of setting, then judging, the voltage of determining to detect do not receive effective light signal.
Further, described optical module also comprises: the light detecting signal output circuit; Described light detecting signal output circuit is specially inverter, and the input of described inverter links to each other with the light detecting signal control output end of described MCU; And
Described MCU is specially according to the output of judged result control light detecting signal:
If judging, described MCU receives effective light signal, then from its light detecting signal control output end output low level; If judging, MCU do not receive effective light signal, then from its light detecting signal control output end output high level; Perhaps,
If judging, described MCU receives effective light signal, then from its light detecting signal control output end output high level; If judging, MCU do not receive effective light signal, then from its light detecting signal control output end output low level.
Perhaps, described light detecting signal output circuit specifically comprises: differential amplifier, DAC, comparator, logical-arithmetic unit;
Wherein, the differential signal output of the TIA in the differential signal input of described differential amplifier and the described optical module links to each other;
The input of described DAC links to each other with described MCU, the data that write in order to receive described MCU;
A voltage input end of described comparator links to each other with the voltage output end of described differential amplifier, and another voltage input end of described comparator links to each other with the output of described DAC;
An input of described logical-arithmetic unit links to each other with the output of described comparator, and another input of described logical-arithmetic unit links to each other with the control output end of described MCU.
Described MCU judges whether to receive effective light signal according to the voltage that detects and is specially:
Receive effective light signal if the voltage that described MCU determines to detect greater than the first threshold of setting, is then judged, determine that current state is state C;
Do not receive effective light signal if the voltage that described MCU determines to detect less than the Second Threshold of setting, is then judged, determine that current state is state A.
The output of described MCU control light detecting signal is specially:
If described MCU determines that current state is state A, then write maximum data to described DAC, and from its control output end to described logical-arithmetic unit output high level;
If described MCU determines that current state is state C, then write minimum data to described DAC, and from its control output end to described logical-arithmetic unit output high level.
The utility model embodiment has or not the judgement that receives the efficient light signal according to the response current Ipd that photodiode produces, and then the output of control light detecting signal; Because the response current Ipd that photodiode produces is not vulnerable to the impact of power supply or other interference source, thereby greatly improved the accuracy of light detecting signal output, reduce the probability of light detecting signal output error, even avoid the phenomenon of light detecting signal output error.
Description of drawings
Fig. 1 is the schematic diagram of the light detecting signal output circuit in the ONU optical module of prior art;
Fig. 2 a, 2b, 2c, 2d are the block diagram of the ONU optical module internal circuit of the utility model embodiment;
Fig. 3 is the internal circuit block diagram of the current detection module of the utility model embodiment;
Fig. 4 is the internal circuit block diagram of the light detecting signal output circuit of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the utility model is further described.Yet, need to prove that many details of listing in the specification only are in order to make the reader to one or more aspects of the present utility model a thorough understanding be arranged, even if there are not these specific details also can realize these aspects of the present utility model.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant with computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: the thread of the process of moving on the processor, processor, object, executable program, execution, program and/or computer.
Main thought of the present utility model is that the photodiode in the ONU optical module can produce corresponding with it response current Ipd after detecting light signal; Ipd judges whether to receive effective light signal by monitoring, thereby exports corresponding light detecting signal.Because the response current Ipd that photodiode produces is subjected to the impact of power supply or other interference source hardly, therefore, judge whether to receive effective light signal according to Ipd, export corresponding light detecting signal, greatly avoid the phenomenon of light detecting signal mistake output, improved the accuracy of light detecting signal output.
Describe the technical scheme of the utility model embodiment in detail below in conjunction with accompanying drawing.The ONU optical module of the utility model embodiment, shown in Fig. 2 a, comprising: ROSA or BOSA, response current detection module 402, MCU(Microprogrammed Control Unit, mini program controlling unit) 403.
Comprise photodiode and TIA among ROSA or the BOSA; Photodiode is exported corresponding response current Ipd after detecting light signal; Generally speaking, the power of the light signal that photodiode is surveyed is stronger, and then the Ipd of output is larger.Described photodiode specifically can be the APD(Avalanche Photo Diode that is applied in the ONU optical module of GPON network, avalanche photodide), it also can be the PIN photodiode (between P, N knot, adding near the I district of intrinsic material, the semiconductor photo detector of formation PIN structure) that is applied in the ONU optical module of EPON network.
The negative electrode of photodiode links to each other with the current input terminal of response current detection module 402, and the Ipd of photodiode output flow into response current detection module 402.Response current detection module 402 is in order to detecting Ipd, and exports corresponding voltage according to the Ipd of input from its voltage output end.That is to say that the voltage of response current detection module 402 outputs changes with the change of the Ipd of input, particularly, both can be relations in direct ratio.In other words, the voltage of response current detection module 402 outputs can reflect the Ipd of input, and then also just can reflect the power of the light signal that photodiode is surveyed.
The voltage input end of MCU403 is connected with the voltage output end of response current detection module 402, in order to detect the voltage of response current detection module 402 outputs.MCU403 judges whether to receive effective light signal according to the voltage of response current detection module 402 outputs that detect; MCU403 controls the output of light detecting signal according to judged result.
As shown in Figure 3, specifically comprise in the above-mentioned current detection module 402: current mirror circuit 501 and sampling resistor 502.
The current input terminal of current mirror circuit 501 links to each other with the negative electrode of photodiode, in order to receive the Ipd of photodiode output.The Ipd inflow current mirror image circuit 501 of photodiode output; The image current output of current mirror circuit 501 links to each other with sampling resistor 502, and the image current of Ipd flows into power supply ground through sampling resistor 502, and namely the image current output of current mirror circuit 501 is received power supply ground by sampling resistor 502.
The image current output of current mirror circuit 501 and the tie point of sampling resistor 502 are as the voltage output end of response current detection module 402, thereby the voltage on the sampling resistor 502 is the output voltage of current detection module 402.MCU403 detects the output voltage of current detection module 402, namely detect the voltage on the sampling resistor 502, and the voltage on the sampling resistor 502 has reflected the size of the image current of current mirror circuit 501, the image current of current mirror circuit 501 has reflected the size of the Ipd that flows into, has also just reflected the size of the power of the light signal that photodiode is surveyed.
MCU403 judges whether that according to the voltage of response current detection module 402 outputs that detect the method that receives effective light signal can be: receive effective light signal if the voltage that MCU403 determines to detect greater than the first threshold of setting, is then judged; If less than the Second Threshold of setting, then judging, the voltage that MCU403 determines to detect do not receive effective light signal.Those skilled in the art can arrange first threshold and Second Threshold according to actual conditions, and the first threshold of setting can equate also can not wait with Second Threshold.If first threshold and Second Threshold do not wait, then be between stagnant regions between first threshold and the Second Threshold.For example, first threshold is 200, and Second Threshold is 100, and then the definite voltage that detects of MCU403 was judged to receive effective light signal greater than 200 o'clock; The voltage that MCU403 determines to detect was judged not receive effective light signal less than 100 o'clock; Be between stagnant regions between 100 to 200.
The most easy a kind of implementation method of the output of MCU403 control light detecting signal is shown in Fig. 2 b, and MCU403 is with the output port of an one output port as light detecting signal.For example, for MCU403 with the situation of an one output port as the SD signal output port: receive effective light signal if MCU403 judges, then from this output port output high level; If judging, MCU403 do not receive effective light signal, then from this output port output low level.
Perhaps, for MCU403 with the situation of an one output port as the LOS signal output port: receive effective light signal if MCU403 judges, then from this output port output low level, if judging, MCU403 do not receive effective light signal, then from this output port output high level.
Further, also comprise in the ONU optical module: light detecting signal output circuit 404.
A kind of Simple Realizable Method of light detecting signal output circuit 404 is shown in Fig. 2 c, and light detecting signal output circuit 404 is an inverter, and the input of inverter links to each other with the light detecting signal control output end of MCU403.Be the situation of SD signal for light detecting signal: if judging, MCU403 receives effective light signal, then from its light detecting signal control output end output low level, inverter output high level then; If judging, MCU403 do not receive effective light signal, then from its output of light detecting signal control output end high level, then inverter output low level.
Be the situation of LOS signal for light detecting signal: receive effective light signal if MCU403 judges, then from its output of light detecting signal control output end high level, then inverter output low level; Do not receive effective light signal if MCU403 judges, then from its light detecting signal control output end output low level, then inverter is exported high level.
The another kind of physical circuit of light detecting signal output circuit 404 comprises as shown in Figure 4: differential amplifier 601, DAC(Digital-to-Analog Converter, digital to analog converter) 602, comparator 603, logical-arithmetic unit 604.
The differential signal input of differential amplifier 601 links to each other with the differential signal output of TIA, and the differential signal of TIA output is input in the differential amplifier 601; Perhaps, the differential signal input of differential amplifier 601 links to each other with the differential signal output of TIA by electric capacity, and the differential signal of TIA output is capacitively coupled in the differential amplifier 601.Differential amplifier 601 is exported corresponding voltage according to the amplitude difference of the differential signal of input from voltage output end.
The input of DAC602 links to each other with MCU403, the data that write in order to receive MCU403, and the data that receive are kept in the register, export corresponding voltage according to the data that receive from its output.
A voltage input end of comparator 603 links to each other with the voltage output end of differential amplifier 601; Another voltage input end of comparator 603 links to each other with the output of DAC602.
An input of logical-arithmetic unit 604 links to each other with the output of comparator 603, and another input of logical-arithmetic unit 604 links to each other with the control output end of MCU403; The signal of the output output of logical-arithmetic unit 604 is light detecting signal, i.e. the output of logical-arithmetic unit 604 output light detecting signal.Logical-arithmetic unit 604 specifically can be and logical-arithmetic unit (or claim with door), perhaps NAND Logic arithmetic unit (or title NAND gate).
MCU403 control light detecting signal output circuit as shown in Figure 4 carries out the circuit of light detecting signal output shown in Fig. 2 d, the below take logical-arithmetic unit 604 as with logical-arithmetic unit (or claim with door) as example, tell about MCU403 and control the light detecting signal output circuit and carry out the concrete grammar that light detecting signal is exported:
MCU403 is according to the value (or claiming AD value) of the voltage of exporting according to the response current detection module 402 that detects, determine current state, current state can be changed between following three kinds of states: the first state (or claiming state A), the second state (or claiming state B), the third state (or claiming state C).MCU403 controls the output of light detecting signal according to the current state of determining.
MCU403 determines that according to the AD value method of current state is:
If MCU403 determines the AD value greater than the first threshold of setting, then judge to receive effective light signal, determine that current state is state C;
If MCU403 determines the AD value less than the Second Threshold of setting, then judge not receive effective light signal, determine that current state is state A;
If MCU403 determines AD value less than the 3rd threshold value of setting, more than or equal to Second Threshold, and current state is state C, and then judgement does not receive effective light signal, and converts the present state to state B.
Above-mentioned first threshold is greater than the 3rd threshold value, and the 3rd threshold value is greater than Second Threshold; For example, first threshold can be that the 200, the 3rd threshold value can be 100, Second Threshold can be 60.
Above-mentioned state B is the sluggish state between state A and the state C, avoids the concussion of light detecting signal output, and is convenient to the switching between state A and the state C.
MCU403 is according to the current state of determining, the method for the output of control light detecting signal is:
If it is state A that MCU403 determines current state, then: MCU403 writes maximum data (for example writing 255) to DAC602, and from its control output end to logical-arithmetic unit 604 output high level; Like this, the threshold level of DAC602 output is maximum, and the voltage of differential amplifier 601 outputs is the large threshold level of also exporting less than DAC602 again, thereby comparator 603 is output as low level; Because comparator 603 is output as low level, then with the logical-arithmetic unit output low level, namely the light detecting signal output low level does not receive the efficient light signal in order to indication.
If it is state B that MCU403 determines current state, then: MCU403 writes minimum data (for example writing 0) to DAC602, and from its control output end to logical-arithmetic unit 604 output low levels; Like this, the threshold level of DAC602 output is minimum value, the less threshold level of also exporting greater than DAC602 of the voltage of differential amplifier 601 outputs, thus comparator 603 is output as high level; Since MCU403 to the logical-arithmetic unit output low level, then with the logical-arithmetic unit output low level, i.e. light detecting signal output low level does not receive the efficient light signal in order to indication.
If it is state C that MCU403 determines current state, then: MCU403 writes minimum data (for example writing 0) to DAC602, and from its control output end to logical-arithmetic unit 604 output high level; Like this, the threshold level of DAC602 output is minimum value, the less threshold level of also exporting greater than DAC602 of the voltage of differential amplifier 601 outputs, thus comparator 603 is output as high level; Because comparator 603 output high level, and MCU403 is to also exporting high level with logical-arithmetic unit, and then with logical-arithmetic unit output high level, i.e. light detecting signal output high level receives the efficient light signal in order to indication.
Above-mentioned is to be specially the SD signal as example take light detecting signal, the control logic of the MCU403 that tells about under state A, B, C; Obviously, those skilled in the art can realize that easily light detecting signal is specially the LOS signal according to the disclosed content of the utility model, and perhaps logical-arithmetic unit 604 is the control logic in the situation of NAND gate.Perhaps, those skilled in the art also can adopt other control logic.Therefore, the various control logics according to the output of AD value control light detecting signal all should be considered as protection range of the present utility model.
The utility model embodiment has or not the judgement that receives the efficient light signal according to the response current Ipd that photodiode produces, and then the output of control light detecting signal; Because the response current Ipd that photodiode produces is not vulnerable to the impact of power supply or other interference source, thereby greatly improved the accuracy of light detecting signal output, reduce the probability of light detecting signal output error, even avoid the phenomenon of light detecting signal output error.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (12)
1. optical network unit optical module comprises:
The negative electrode of the photodiode in the response current detection module, its current input terminal and described optical module links to each other, and in order to detecting the response current of described photodiode output, and exports corresponding voltage according to described response current from its voltage output end;
Mini program controlling unit MCU, its voltage input end links to each other with the voltage output end of described response current detection module, in order to detect the voltage of described response current detection module output, judges whether to receive effective light signal according to the voltage that detects; And according to the output of judged result control light detecting signal.
2. optical module as claimed in claim 1 is characterized in that, described response current detection module specifically comprises: current mirror circuit and sampling resistor;
The current input terminal of described current mirror circuit links to each other with the negative electrode of described photodiode, and the image current output of described current mirror circuit is received power supply ground by described sampling resistor; The image current output of described current mirror circuit and the tie point of described sampling resistor are the voltage output end of described response current detection module.
3. optical module as claimed in claim 1 or 2 is characterized in that,
Described MCU judges whether to receive effective light signal according to the voltage that detects and is specially:
If greater than the first threshold of setting, then judging, the voltage that described MCU determines to detect receives effective light signal; If less than the Second Threshold of setting, then judging, the voltage of determining to detect do not receive effective light signal.
4. optical module as claimed in claim 3 is characterized in that, also comprises: the light detecting signal output circuit; Described light detecting signal output circuit is specially inverter, and the input of described inverter links to each other with the light detecting signal control output end of described MCU; And
Described MCU is specially according to the output of judged result control light detecting signal:
If judging, described MCU receives effective light signal, then from its light detecting signal control output end output low level; If judging, MCU do not receive effective light signal, then from its light detecting signal control output end output high level; Perhaps,
If judging, described MCU receives effective light signal, then from its light detecting signal control output end output high level; If judging, MCU do not receive effective light signal, then from its light detecting signal control output end output low level.
5. optical module as claimed in claim 1 or 2 is characterized in that, also comprises: the light detecting signal output circuit; Described light detecting signal output circuit specifically comprises: differential amplifier, DAC, comparator, logical-arithmetic unit;
Wherein, the differential signal output of the TIA in the differential signal input of described differential amplifier and the described optical module links to each other;
The input of described DAC links to each other with described MCU, the data that write in order to receive described MCU;
A voltage input end of described comparator links to each other with the voltage output end of described differential amplifier, and another voltage input end of described comparator links to each other with the output of described DAC;
An input of described logical-arithmetic unit links to each other with the output of described comparator, and another input of described logical-arithmetic unit links to each other with the control output end of described MCU.
6. optical module as claimed in claim 5 is characterized in that, described logical-arithmetic unit is specially and logical-arithmetic unit, perhaps the NAND Logic arithmetic unit.
7. optical module as claimed in claim 6 is characterized in that, described MCU judges whether to receive effective light signal according to the voltage that detects and is specially:
Receive effective light signal if the voltage that described MCU determines to detect greater than the first threshold of setting, is then judged, determine that current state is state C;
Do not receive effective light signal if the voltage that described MCU determines to detect less than the Second Threshold of setting, is then judged, determine that current state is state A.
8. optical module as claimed in claim 7 is characterized in that, the output of described MCU control light detecting signal is specially:
If described MCU determines that current state is state A, then write maximum data to described DAC, and from its control output end to described logical-arithmetic unit output high level;
If described MCU determines that current state is state C, then write minimum data to described DAC, and from its control output end to described logical-arithmetic unit output high level.
9. optical module as claimed in claim 8 is characterized in that, described MCU judges whether to receive effective light signal according to the voltage that detects and also comprises:
If the voltage that described MCU determine to detect is less than the 3rd threshold value of setting, more than or equal to Second Threshold, and current state is state C, then judges not receive effective light signal, and converts the present state to state B.
10. optical module as claimed in claim 9 is characterized in that, the output of described MCU control light detecting signal also comprises:
If described MCU determines that current state is state B, then MCU writes minimum data to described DAC, and from its control output end to described logical-arithmetic unit output low level.
11. optical module as claimed in claim 9 is characterized in that, first threshold is greater than the 3rd threshold value, and the 3rd threshold value is greater than Second Threshold.
12., it is characterized in that described light detecting signal is LOS signal or SD signal such as the arbitrary described optical module of claim 1-6.
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| CN 201220356303 CN202737870U (en) | 2012-07-20 | 2012-07-20 | Optical network unit optical module |
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| CN 201220356303 CN202737870U (en) | 2012-07-20 | 2012-07-20 | Optical network unit optical module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171722A (en) * | 2017-07-26 | 2017-09-15 | 青岛海信宽带多媒体技术有限公司 | A kind of monitoring method, device and the terminal of optical module received optical power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107171722A (en) * | 2017-07-26 | 2017-09-15 | 青岛海信宽带多媒体技术有限公司 | A kind of monitoring method, device and the terminal of optical module received optical power |
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