CN102752052A - Optical module of optical network unit and method for outputting control electric signal thereof - Google Patents
Optical module of optical network unit and method for outputting control electric signal thereof Download PDFInfo
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- CN102752052A CN102752052A CN2012102560441A CN201210256044A CN102752052A CN 102752052 A CN102752052 A CN 102752052A CN 2012102560441 A CN2012102560441 A CN 2012102560441A CN 201210256044 A CN201210256044 A CN 201210256044A CN 102752052 A CN102752052 A CN 102752052A
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Abstract
The invention discloses an optical module of an optical network unit and a method for outputting a control electric signal thereof. The optical module comprises a responsive current detection module for detecting a responsive current Ipd output by a photodiode and outputting a corresponding voltage from a voltage output end thereof according to the Ipd; an MCU (Micro-programmed Control Unit) and an amplitude-limiting amplifier, wherein the MCU is used for detecting the voltage output by the responsive current detection module and writing a corresponding value into the amplitude limiting amp0lfiier through a bus according to the detected voltage; and the amplitude limiting amplifier sets a threshold according to the written-in value, compares an amplitude difference of the received differential signals with the threshold and outputs a differential electric signal according to the comparison result. As whether an efficient optical signal is received is judged according to the responsive current generated by the photodiode and the threshold of the amplitude limiting amplifier is further adjusted, noise is suppressed and wrong outputting of an electric signal due to noise interference is avoided.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, relate in particular to the method for a kind of optical network unit optical module and the output of the control signal of telecommunication thereof.
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, wherein PON (EPON) receives much concern again, becomes 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 broadband P ON technology that attention more 1Gbit/s is above, i.e. EPON, GPON.The full name of GPON is Gigabit-capable PON, the EPON of gigabit progression just, and its transmission rate maximum can reach 2.5Gbps; And the support 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 module in the PON network receives the light signal that local side sends in order to survey, and converts the equipment that the signal of telecommunication sends to user side into surveying the light signal that receives; And the signal of telecommunication of the equipment transmission of reception user side, be that light signal backward office end sends with electrical signal conversion.Usually, 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 (Tranimpedance Amplifier, trans-impedance amplifier) have been generally included among ROSA or the BOSA.Said photodiode specifically can be APD (the 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 an I district, the semiconductor photo detector of formation PIN structure) that is applied in the ONU optical module of EPON network near intrinsic material.
Fig. 1 illustrate light signal in the ONU optical module convert the signal of telecommunication into, with the circuit of signal of telecommunication output; After photodiode among ROSA or the BOSA detects the light signal of certain power; TIA can export the differential signal of certain amplitude difference; The amplitude difference of differential signal is big more, and then the power of the light signal of explanation reception is big more; The amplitude difference of differential signal is more little, explains that the power of the light signal that receives is more little; If the amplitude difference of differential signal is zero, then show no light signal.The differential signal of TIA output is coupled in the limiting amplifier, and limiting amplifier is exported by the light signal electrical signal converted.Usually be provided with threshold value in the limiting amplifier, the amplitude difference and the threshold value of the differential signal of input compare; If the amplitude difference of the differential signal of input thinks then to receive effective light signal that then output has the differential signal of difference (RD-, RD+) by a relatively large margin greater than threshold value; If the amplitude difference of the differential signal of input thinks then not receive effective light signal that less than threshold value then do not export differential signal, promptly the output amplitude difference is 0 differential signal.
Yet in practical application; ONU in the PON network (optical net unit; Optical network unit) optical module is mainly used on ONU BOX (ONU box) equipment, concerning the system equipment merchant, for the application and the cost consideration in different markets; The BOX chip solution of being selected for use is also different, and also each is variant for circuit design.May produce very strong power supply noise and interference in the PCB design of the ONU BOX equipment that therefore, has.
Power supply noise that ONU BOX equipment produces and interference may be incorporated into the input of limiting amplifier by circuit; Like this; The differential signal of limiting amplifier input receives external noise and disturbs when not having effective light to import; Had certain amplitude difference, this amplitude difference is if surpass the threshold value in the limiting amplifier, and then limiting amplifier has the differential signal of difference by a relatively large margin at its output with output; Thereby cause the consequence of noise, cause the mistake output of the signal of telecommunication as effective signal of telecommunication output.Therefore, there is the problem because of the wrong output of the noise jamming signal of telecommunication in the ONU optical module of prior art.
Summary of the invention
Embodiments of the invention provide the method for a kind of optical network unit optical module and the output of the control signal of telecommunication thereof, in order to avoid because of the wrong output of the noise jamming signal of telecommunication.
According to an aspect of the present invention, a kind of optical network unit optical module is provided, has comprised:
The negative electrode of the photodiode in the response current detection module, its current input terminal and said optical module links to each other, in order to detecting the response current of said photodiode output, and according to said response current from its voltage output end output correspondent voltage;
Mini program controlling unit MCU and limiting amplifier, the voltage input end of said MCU links to each other with the voltage output end of said response current detection module, and said MCU links to each other with limiting amplifier in the said optical module through bus; Said MCU is in order to detecting the voltage of said response current detection module output, and writes relevant numerical through said bus to said limiting amplifier according to the voltage that detects;
Said limiting amplifier is provided with threshold value according to the numerical value that writes, and receives the differential signal of the TIA output in the said optical module, and amplitude difference and the said threshold value of the differential signal that receives compared, and exports differential electric signal according to comparative result.
Wherein, said response current detection module specifically comprises: current mirror circuit and sampling resistor;
The current input terminal of said current mirror circuit links to each other with the negative electrode of said photodiode, and the image current output of said current mirror circuit is received power supply ground through said sampling resistor; The image current output of said current mirror circuit and the tie point of said sampling resistor are the voltage output end of said response current detection module.
Said MCU writes relevant numerical through said bus to said limiting amplifier according to the voltage that detects and is specially:
Said MCU is if the voltage of confirming to detect less than voltage setting value A, then writes numerical value A to said limiting amplifier; If the voltage of confirming to detect then writes numerical value B to said limiting amplifier greater than voltage setting value B; Perhaps,
Said MCU confirms the luminous power of the light signal that said photodiode is surveyed according to the voltage that detects; If the luminous power of confirming then writes numerical value A to said limiting amplifier less than set value of the power A; If the luminous power of confirming then writes numerical value B to said limiting amplifier greater than set value of the power B.
Perhaps, said response current detection module specifically comprises:
The current mirror circuit and first sampling resistor, the current input terminal of said current mirror circuit links to each other with the negative electrode of said photodiode, and the image current output of said current mirror circuit is received power supply ground through first sampling resistor;
Second sampling resistor is connected between the image current output of control output end and said current mirror circuit of said MCU; And
Said MCU also is used for confirming luminous power according to the voltage that detects; And, control the output of its control output end according to the luminous power of confirming.
According to another aspect of the present invention, the method for control signal of telecommunication output in a kind of optical network unit optical module is provided, has comprised:
MCU detects the voltage of response current detection module output; And
Voltage according to detecting writes relevant numerical to limiting amplifier;
Wherein, the negative electrode of the photodiode in the current input terminal of said response current detection module and the said optical module links to each other, in order to detecting the response current of said photodiode output, and according to said response current from its voltage output end output correspondent voltage;
The voltage input end of said MCU links to each other with the voltage output end of said response current detection module, and said MCU links to each other with said limiting amplifier through bus; Said limiting amplifier is provided with threshold value according to said MCU through the numerical value that said bus writes; And receive the differential signal of the TIA output in the said optical module; The amplitude difference and the said threshold value of the differential signal that receives are compared, according to comparative result output differential electric signal.
Said voltage according to detection writes relevant numerical to limiting amplifier and specifically comprises:
Said MCU is if the voltage of confirming to detect less than voltage setting value A, then writes numerical value A to said limiting amplifier; If the voltage of confirming to detect then writes numerical value B to said limiting amplifier greater than voltage setting value B; Perhaps,
Said MCU confirms the luminous power of the light signal that said photodiode is surveyed according to the voltage that detects; If the luminous power of confirming then writes numerical value A to said limiting amplifier less than set value of the power A; If the luminous power of confirming then writes numerical value B to said limiting amplifier greater than set value of the power B.
The embodiment of the invention is because the response current Ipd that produces according to photodiode has or not the judgement that receives effective light signal; And then the threshold value of adjustment limiting amplifier; Thereby can under the situation that does not receive effective light signal, suppress noise, avoid because of the wrong output of the noise jamming signal of telecommunication.
Description of drawings
Fig. 1 is the sketch map of the signal of telecommunication output circuit in the ONU optical module of prior art;
Fig. 2 is the block diagram of the ONU optical module internal circuit of the embodiment of the invention;
Fig. 3 is a kind of circuit block diagram of physical circuit of the response current detection module of the embodiment of the invention;
Fig. 4,5 is the method flow diagram of the MCU control signal of telecommunication output of the embodiment of the invention;
Fig. 6 is the circuit block diagram of another kind of physical circuit of the response current detection module of the embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to accompanying drawing and enumerate preferred embodiment, to further explain of the present invention.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 invention a thorough understanding arranged, even if there are not these specific details also can realize these aspects of the present invention.
Terms such as " module " that the application uses, " 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 invention is that the photodiode in the ONU optical module can produce corresponding response electric current I pd with it after detecting light signal; Ipd judges whether to receive effective light signal through monitoring; If judge and do not receive effective light signal; Then adjustment increases the threshold value in the limiting amplifier; The amplitude that prevents to be coupled to the noise of limiting amplifier input surpasses threshold value; Thereby under the situation that does not receive effective light signal, suppressed noise, prevented because of the wrong output of the noise jamming signal of telecommunication.Receive effective light signal if judge, then the threshold value in the limiting amplifier is adjusted into normal value, carry out the output of the normal signal of telecommunication.
Specify the technical scheme of the embodiment of the invention below in conjunction with accompanying drawing.The ONU optical module of the embodiment of the invention, as shown in Figure 2, comprising: ROSA or BOSA, limiting amplifier 201, response current detection module 202, MCU (Microprogrammed Control Unit, mini program controlling unit) 203.
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 strong more, and then the Ipd of output is big more.
The negative electrode of photodiode links to each other with the current input terminal of response current detection module 202, and the Ipd of photodiode output flow into response current detection module 202.Response current detection module 202 is in order to detecting Ipd, and according to the Ipd of input from its voltage output end output correspondent voltage.That is to say that the voltage of response current detection module 202 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 202 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 MCU203 is connected with the voltage output end of response current detection module 202, in order to detect the voltage of response current detection module 202 outputs.MCU203 also links to each other with limiting amplifier 201 through bus, and in order to write numerical value through bus to limiting amplifier 201, limiting amplifier 201 is provided with threshold value according to the numerical value that MCU203 writes.This bus can be a parallel bus, also can be universal serial bus, for example iic bus.
MCU203 judges whether to receive effective light signal according to the voltage of the response current detection module that detects 202 outputs; MCU203 writes relevant numerical through bus to limiting amplifier 201 according to judged result, and limiting amplifier 201 is provided with threshold value according to the numerical value that receives.
The differential signal output of TIA among the differential signal input of limiting amplifier 201 and ROSA or the BOSA links to each other, in order to receive the differential signal of TIA output;
Perhaps; The differential signal input of limiting amplifier 201 links to each other through the differential signal output of the TIA among electric capacity and ROSA or the BOSA, is coupled to the differential signal of the differential signal input of this limiting amplifier 201 from the differential signal output of TIA in order to reception.
Limiting amplifier 201 compares the amplitude difference and the said threshold value of the differential signal that receives; Export differential electric signal according to comparative result: if the differential signal that receives greater than the threshold value that is provided with in this limiting amplifier, then carries out amplitude limit to the differential signal that receives and amplifies output; If the differential signal that receives is not then exported differential signal less than the threshold value that is provided with in this limiting amplifier, promptly the output amplitude difference is 0 differential signal.
A kind of physical circuit in the above-mentioned response current detection module 202, as shown in Figure 3, comprising: current mirror circuit 301 and sampling resistor 302.
The current input terminal of current mirror circuit 301 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 301 of photodiode output; The image current output of current mirror circuit 301 links to each other with sampling resistor 302, and the image current of Ipd flows into power supply ground through sampling resistor 302, and promptly the image current output of current mirror circuit 301 is received power supply ground through sampling resistor 302.
The image current output of current mirror circuit 301 and the tie point of sampling resistor 302 are as the voltage output end of response current detection module 202, thereby the voltage on the sampling resistor 302 is the output voltage of current detection module 402.MCU203 detects the output voltage of current detection module 402; Promptly detect the voltage on the sampling resistor 302; And the voltage on the sampling resistor 302 has reflected the size of the image current of current mirror circuit 301; The image current of current mirror circuit 301 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.
MCU203 controls a kind of method flow of signal of telecommunication output according to the voltage of the response current detection module output shown in Figure 3 that detects, and is as shown in Figure 4, comprises the steps:
S401:MCU203 compares the voltage that detects and first voltage setting value (or claiming voltage setting value A), second voltage setting value (or claiming voltage setting value B); If the voltage that detects is less than voltage setting value A, execution in step S402 then; If the voltage that detects is greater than voltage setting value B, execution in step S403 then.
S402: less than voltage setting value A, then MCU203 writes first numerical value (or claiming numerical value A) to limiting amplifier 201 as if the voltage that detects.
If the voltage that detects is less than voltage setting value A, then MCU203 judges that the ONU optical module does not receive effective light signal, writes numerical value A to limiting amplifier 201; Numerical value A is a bigger numerical value; Limiting amplifier 201 is set to high value to threshold value according to the numerical value A that receives; Thereby under the situation that does not receive effective light signal, prevented that the mistake of introducing the signal of telecommunication that noise causes to the differential input end of limiting amplifier 201 because of circuit from exporting.Voltage setting value A is predefined.
S403: greater than voltage setting value B, then MCU203 writes second value (or claiming numerical value B) to limiting amplifier 201 as if the voltage that detects.
If the voltage that detects is less than voltage setting value B, then MCU203 judges that the ONU optical module receives effective light signal, writes numerical value B to limiting amplifier 201; Limiting amplifier 201 is set to normal value (this normal value can be the threshold values that are provided with usually in the limiting amplifier 201 in the ONU optical module of prior art) to threshold value according to the numerical value B that receives, thereby the amplitude limit that carries out normal differential signal amplifies output.Voltage setting value B is predefined.
Those skilled in the art can set above-mentioned voltage setting value A, voltage setting value B, numerical value A, numerical value B according to actual conditions.For example, setting voltage set point A is that 5mV, voltage setting value B are that 10mV, numerical value A are 128, numerical value B is 50.The voltage setting value A that is provided with can equate also can not wait with voltage setting value B.If voltage setting value B and voltage setting value A do not wait, be between stagnant regions between voltage setting value A and the voltage setting value B then, with the concussion that prevents that single-point from switching.Generally speaking, voltage setting value A is less than voltage setting value B.
MCU203 controls the another kind of method flow of signal of telecommunication output according to the voltage of the response current detection module output shown in Figure 3 that detects, and is as shown in Figure 5, comprises the steps:
S501:MCU203 confirms the luminous power of the light signal that photodiode is surveyed according to the voltage that detects.
Particularly, MCU203 can adopt the method for tabling look-up to confirm luminous power according to the magnitude of voltage that detects; Perhaps, calculate luminous power according to magnitude of voltage that detects and current sampling resistor resistance.MCU203 confirms the method that the method for luminous power is well known to those skilled in the art according to the magnitude of voltage that detects, and repeats no more here.
S502:MCU203 compares the luminous power of confirming and first set value of the power (or claiming set value of the power A), second set value of the power (or claiming set value of the power B); If the luminous power of confirming is less than set value of the power A, execution in step S503 then; If the luminous power of confirming is greater than set value of the power B, execution in step S504 then.
S503: less than set value of the power A, then MCU203 writes numerical value A to limiting amplifier 201 as if the luminous power of confirming.
Limiting amplifier 201 is set to high value to threshold value according to the numerical value A that receives, thereby under the situation that does not receive effective light signal, has prevented that the mistake of introducing the signal of telecommunication that noise causes to the differential input end of limiting amplifier 201 because of circuit from exporting.Set value of the power A is predefined.
S504: greater than set value of the power B, then MCU203 writes numerical value B to limiting amplifier 201 as if the luminous power of confirming.
Limiting amplifier 201 is set to normal value to threshold value according to the numerical value B that receives, thereby the amplitude limit that carries out normal differential signal amplifies output.Set value of the power B is predefined.
Those skilled in the art can set above-mentioned set value of the power A, set value of the power B according to actual conditions.For example, setting power set point A be-33dBm, set value of the power B be-31dBm.The set value of the power A that is provided with can equate also can not wait with set value of the power B.If set value of the power B and set value of the power A do not wait, be between stagnant regions between set value of the power A and the set value of the power B then, with the concussion that prevents that single-point from switching.Generally speaking, set value of the power A is less than set value of the power B.
Another kind of physical circuit in the above-mentioned response current detection module 202, as shown in Figure 6, comprising: current mirror circuit 602, the first sampling resistor R604, the second sampling resistor R605.
The current input terminal of current mirror circuit 602 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 602 of photodiode output; The image current output of current mirror circuit 602 links to each other with the first sampling resistor R604; The image current of Ipd flows into power supply ground through the first sampling resistor R604, and promptly the image current output of current mirror circuit 602 is received power supply ground through the first sampling resistor R604.
The voltage input end of MCU203 links to each other with the image current output of current mirror circuit 602, and just the voltage input end of MCU203 links to each other with the first sampling resistor R604.In addition, the voltage input end of MCU203 also links to each other with the end of the second sampling resistor R605, and the other end of the second sampling resistor R605 links to each other with the control output end of MCU203.Promptly the second sampling resistor R605 is connected between the image current output of control output end and current mirror circuit 602 of MCU203.
MCU203 can pass through its control output end; The variation of control sampling resistor resistance: if MCU203 is from its control output end output low level; The sampling resistor resistance that then is linked into the image current output of current mirror circuit 602 is: R604 and R605 parallel resistor resistance; That is to say that the image current that the image current output of current mirror circuit 602 flows out flow into power supply ground through R604 and R605; MCU203 is a high resistant if its control output end is set; The sampling resistor resistance that then is linked into the image current output of current mirror circuit 602 is the resistance of R604; That is to say that the image current that the image current output of current mirror circuit 602 flows out only flow into power supply ground through R604.
Generally speaking, the control output end of MCU203 can be general purpose I/O port of MCU203, and it can be in three kinds of states: output high level, output low level, or be high-impedance state.State with the control output end output low level of MCU203 among this paper is called first state (or claiming state A); With the control output end of MCU203 is that the state of high resistant is called second state (or claiming state B).
MCU203 is input to the voltage of its voltage input end in order to detection, and this voltage is that the image current of current mirror circuit 602 outputs is through voltage that sampling resistor produced.MCU203 confirms the luminous power of the light signal that said photodiode is surveyed according to the voltage that detects.
Because under first state and second state, the sampling resistor resistance of image current output that is linked into current mirror circuit 602 is different, and therefore, the method for MCU203 calculating luminous power under first state and second state is also just different.So MCU203 also confirms luminous power according to the current state of its control output end when confirming luminous power according to the magnitude of voltage that detects.Be MCU203 according to the magnitude of voltage that detects, with and the current state of control output end be first state or second state, confirm luminous power.
After MCU203 determines luminous power, will further confirm current state, and then whether decision carries out the transformation of state:
If MCU203 confirms that luminous power greater than first optical power threshold of setting, shows that then the luminous power of detection is in the high power section, confirm that then current state is first state; MCU203 is under first state, and from its control output end output low level, then the sampling resistor resistance is: R604 and R605 parallel resistor resistance; So, the sampling resistor resistance is less, can avoid the overtension on the sampling resistor, also just avoid being input to the voltage input end of MCU203 overtension, surpass the reference voltage detection of MCU203; Thereby the luminous power that guarantees the high power section detects the detection range that is no more than MCU, has avoided luminous power to detect ultra scope.
If MCU203 confirms that luminous power is less than second optical power threshold of setting; The luminous power that then shows detection is in the low-power section, confirms that then current state is second state, and MCU203 is under second state; Controlling its control output end is high-impedance state, and then the sampling resistor resistance is: the resistance of R604; So; The sampling resistor resistance is bigger; Can be so that under the less situation of the image current of current mirror circuit 602 outputs, the voltage on the sampling resistor still be maintained in the higher scope, like this; MCU203 can guarantee the precision through the voltage of its voltage input end detection, thereby avoids can't guaranteeing owing to the brownout that detects the problem of accuracy of detection.
The first above-mentioned optical power threshold is greater than second optical power threshold; Those skilled in the art can be provided with first optical power threshold and second optical power threshold according to actual conditions.For example, first optical power threshold and second optical power threshold are set to be respectively-16dBm and-14dBm.Because first optical power threshold and second optical power threshold are unequal, then between first optical power threshold and second optical power threshold, have produced between stagnant regions, can avoid single-point to switch and cause the control output end of MCU203 reforming phenomena to occur.
MCU203 can more accurately confirm luminous power through the voltage of response current detection module output as shown in Figure 6.
MCU203 is after determining luminous power, and the flow process of controlling the method for signal of telecommunication output according to the luminous power of confirming can be identical with above-mentioned step S502-S504, repeats no more here.
Further, MCU203 can also be according to the voltage that detects, and during less than set value of the power A, the indication of control light detecting signal does not receive effective light signal to the output of control light detecting signal: MCU203 in the luminous power of confirming; During less than set value of the power B, the indication of control light detecting signal receives effective light signal in the luminous power of confirming.Light detecting signal specifically can be LOS (Loss of Signal, a signal loss detection indication) signal, perhaps SD (Signal Detect, input indication) signal.
The embodiment of the invention is because the response current Ipd that produces according to photodiode has or not the judgement that receives effective light signal; And then the threshold value of adjustment limiting amplifier; Thereby can under the situation that does not receive effective light signal, suppress noise, avoid because of the wrong output of the noise jamming signal of telecommunication.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; This program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. optical network unit optical module comprises:
The negative electrode of the photodiode in the response current detection module, its current input terminal and said optical module links to each other, in order to detecting the response current of said photodiode output, and according to said response current from its voltage output end output correspondent voltage;
Mini program controlling unit MCU and limiting amplifier, the voltage input end of said MCU links to each other with the voltage output end of said response current detection module, and said MCU links to each other with limiting amplifier in the said optical module through bus; Said MCU is in order to detecting the voltage of said response current detection module output, and writes relevant numerical through said bus to said limiting amplifier according to the voltage that detects;
Said limiting amplifier is provided with threshold value according to the numerical value that writes, and receives the differential signal of the TIA output in the said optical module, and amplitude difference and the said threshold value of the differential signal that receives compared, and exports differential electric signal according to comparative result.
2. optical module as claimed in claim 1 is characterized in that, said response current detection module specifically comprises: current mirror circuit and sampling resistor;
The current input terminal of said current mirror circuit links to each other with the negative electrode of said photodiode, and the image current output of said current mirror circuit is received power supply ground through said sampling resistor; The image current output of said current mirror circuit and the tie point of said sampling resistor are the voltage output end of said response current detection module.
3. optical module as claimed in claim 2 is characterized in that, said MCU writes relevant numerical through said bus to said limiting amplifier according to the voltage that detects and is specially:
Said MCU is if the voltage of confirming to detect less than voltage setting value A, then writes numerical value A to said limiting amplifier; If the voltage of confirming to detect then writes numerical value B to said limiting amplifier greater than voltage setting value B; Perhaps,
Said MCU confirms the luminous power of the light signal that said photodiode is surveyed according to the voltage that detects; If the luminous power of confirming then writes numerical value A to said limiting amplifier less than set value of the power A; If the luminous power of confirming then writes numerical value B to said limiting amplifier greater than set value of the power B.
4. optical module as claimed in claim 1 is characterized in that, said response current detection module specifically comprises:
The current mirror circuit and first sampling resistor, the current input terminal of said current mirror circuit links to each other with the negative electrode of said photodiode, and the image current output of said current mirror circuit is received power supply ground through first sampling resistor;
Second sampling resistor is connected between the image current output of control output end and said current mirror circuit of said MCU; And
Said MCU also is used for confirming luminous power according to the voltage that detects; And, control the output of its control output end according to the luminous power of confirming.
5. optical module as claimed in claim 4 is characterized in that, said MCU is according to the luminous power of confirming, the output of controlling its control output end is specially:
If MCU confirms said luminous power greater than first optical power threshold, then control its control output end output low level;
If MCU confirms said luminous power less than second optical power threshold, then controlling its control output end is high-impedance state.
6. optical module as claimed in claim 5 is characterized in that, said MCU confirms that according to the voltage that detects luminous power is specially:
Said MCU is according to the voltage that detects, with and the current state of control output end be first state or second state, confirm luminous power;
Wherein, first state refers to the state of the control output end output low level of said MCU; The control output end that second state refers to said MCU is the state of high resistant.
7. optical module as claimed in claim 5 is characterized in that, said MCU writes relevant numerical through said bus to said limiting amplifier according to the voltage that detects and is specially:
After said MCU confirms luminous power according to the voltage that detects, if the luminous power of confirming then writes numerical value A to said limiting amplifier less than set value of the power A; If the luminous power of confirming then writes numerical value B to said limiting amplifier greater than set value of the power B.
8. like the described optical module of claim 1-7, it is characterized in that said MCU also is used for according to the voltage that detects, the output of control light detecting signal.
9. control the method that the signal of telecommunication is exported in an optical network unit optical module, comprising:
MCU detects the voltage of response current detection module output; And
Voltage according to detecting writes relevant numerical to limiting amplifier;
Wherein, the negative electrode of the photodiode in the current input terminal of said response current detection module and the said optical module links to each other, in order to detecting the response current of said photodiode output, and according to said response current from its voltage output end output correspondent voltage;
The voltage input end of said MCU links to each other with the voltage output end of said response current detection module, and said MCU links to each other with said limiting amplifier through bus; Said limiting amplifier is provided with threshold value according to said MCU through the numerical value that said bus writes; And receive the differential signal of the TIA output in the said optical module; The amplitude difference and the said threshold value of the differential signal that receives are compared, according to comparative result output differential electric signal.
10. method as claimed in claim 9 is characterized in that, said voltage according to detection writes relevant numerical to limiting amplifier and specifically comprises:
Said MCU is if the voltage of confirming to detect less than voltage setting value A, then writes numerical value A to said limiting amplifier; If the voltage of confirming to detect then writes numerical value B to said limiting amplifier greater than voltage setting value B; Perhaps,
Said MCU confirms the luminous power of the light signal that said photodiode is surveyed according to the voltage that detects; If the luminous power of confirming then writes numerical value A to said limiting amplifier less than set value of the power A; If the luminous power of confirming then writes numerical value B to said limiting amplifier greater than set value of the power B.
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