CN201623362U - External burst automatic optical power control circuit - Google Patents
External burst automatic optical power control circuit Download PDFInfo
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- CN201623362U CN201623362U CN2010201480658U CN201020148065U CN201623362U CN 201623362 U CN201623362 U CN 201623362U CN 2010201480658 U CN2010201480658 U CN 2010201480658U CN 201020148065 U CN201020148065 U CN 201020148065U CN 201623362 U CN201623362 U CN 201623362U
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Abstract
The utility model provides an external burst automatic optical power control circuit, which comprises a sampling resistance, a burst sampling hold circuit, a buffer circuit, a sampling compensation circuit and a microcontroller, wherein the controller is provided with an A/D analog-to-digital conversion end and at least one D/A digital-to-analog conversion end, and the bias current control signal of a laser is output by one of the D/A digital-to-analog conversion ends; one end of the sampling resistance is grounded, the other end thereof and the input end of the burst sampling hold circuit are connected with the positive pole of a backlight diode of the laser, the output end of the burst sampling hold circuit is connected with the input end of the buffer circuit, and the output end of the buffer circuit is connected with the A/D analog-to-digital conversion end of the microcontroller; and the sampling compensation circuit is connected between the microcontroller and the burst sampling hold circuit, and BEN synchronizing signal is acted on the burst sampling hold circuit and the sampling compensation circuit. The utility model can ensure the relative stability of the optical power and the extinction ratio of an ONU optical module under burst working condition, and has better stability and expansibility of a circuit.
Description
Technical field
The utility model relates to a kind of above gigabit passive optical network user of gigabit optical module (Gigabit-Capable Passive Optical Network Unit that is used for, abbreviation GPON ONU) drive circuit for laser (Auto Power Control, be called for short APC) automatic optical power control circuit, relate in particular to a kind of external burst automatic optical power control circuit.
Background technology
Optical fiber inserts the preferred manner that becomes Access Network in the world gradually, and EPON (Passive Optical Network is called for short PON) technology becomes the highest technical scheme of cost performance especially in Optical Access Network.Passive optical network technique adopts time division multiplexing (Time DivisionMultiplexer, TDM) transmission means up, broadcast downstream makes optical-fiber network broadband application rate higher, be positioned at each network user's unit ONU (Optical Network Unit of terminal, be called for short ONU) accept the following transmission control system signal of local side (Optical Line Termianl is called for short OLT) on the one hand and in effective time, upload light signal to OLT.Wherein, the ONU optical module is uploaded to the OLT light signal can relate to two important technology indexs: the stability of luminous power and extinction ratio, receive accuracy, the especially optical power stability of light signal with directly having influence on the OLT termination.But the factor that the light signal optical power stability is uploaded in decision is the drive circuit for laser of ONU optical module.At present, be used for gigabit passive optical network (GPON ONU) optical module employing drive circuit for laser as shown in Figure 1, comprise: the laser, microcontroller and the closed loop laser driver chip that constitute by laser diode LD and diode PD backlight, this chip comprises: modulated current circuit, bias current circuit and built-in burst APC circuit etc., the built-in burst APC circuit of back facet current Im input that diode PD backlight produces is realized the auto light power controlled function of ONU module with this.But there is following shortcoming in built-in burst APC circuit: 1, the ONU optical module of the type integrated chip IC scheme at work, when if inter-packet gap is grown (greater than 2s), when next burst packets arrives, module is luminous unusual, show as the level"1" and the level "0" that need a period of time to rebulid light signal, in the normal optical transmission is unallowed, can cause loss of data, this mainly is because of the definition difference of each producer integrated chip IC scheme inside to burst APC circuit, do not take into full account the matter of time that in special occasions, happens suddenly, failing the long period maintains the sampling of the back facet current Im that diode PD backlight produces, causes the luminous power instability; 2, in actual transmissions, the received burst control signal of each ONU optical module is not simultaneously, Bao Changyu inter-packet gap difference is bigger, short bag length can reach below the 200ns, long bag can be more than the 100us, under the long situation of continuous short bag, the module of some IC schemes the long extinction ratio of the long relatively bag of its extinction ratio can occur and diminish, can reach 3～4dB at most, so big extinction ratio fluctuation is not obviously wished to occur, this is disadvantageous for local side OLT, and the main cause that produces this phenomenon is the settling time that the bandwidth problem of diode PD backlight itself has influenced back facet current Im, causes precision not high; 3, the autgmentability of circuit is bad, owing to be subjected to the restriction of existing integrated IC scheme, causes ONU optical module what's new upgrading difficulty.
Summary of the invention
For overcoming above shortcoming, the utility model provides a kind of external burst automatic optical power control circuit of light power stabilising.
For reaching above goal of the invention, the utility model provides a kind of external burst automatic optical power control circuit, comprise: a sampling resistor, a burst sampling holding circuit, a buffer circuit, a sampling compensating circuit and a microcontroller, this controller is provided with an A/D analog-to-digital conversion end and at least one D/A digital-to-analogue conversion end; One end ground connection of described sampling resistor, the input of the other end and described burst sampling holding circuit is connected with the diode cathode backlight of laser, the output of described burst sampling holding circuit connects the input of described buffer circuit, and the output of buffer circuit is connected with the A/D analog-to-digital conversion end of described microcontroller; Described sampling compensating circuit is connected between described microcontroller and the burst sampling holding circuit, and the BEN synchronizing signal acts on described burst sampling holding circuit and sampling compensating circuit.
Described burst sampling holding circuit, comprise: a single-pole single-throw switch (SPST) and a sampling keep electric capacity, the input A of described single-pole single-throw switch (SPST) connects the diode cathode backlight of described laser, and its output B connects described sampling and keeps electric capacity one end, this electric capacity other end ground connection.
Described sampling compensating circuit comprises: a discharge resistance, single-pole double-throw switch (SPDT) and an energy pre-storage electric capacity, and described single-pole double-throw switch (SPDT) is provided with the end that the first link A0 is electrically connected described energy pre-storage electric capacity, this electric capacity other end ground connection; The second link B 0 connects the output B of single-pole single-throw switch (SPST) by described discharge resistance; The 3rd link B1 is the input of sampling compensating circuit.
The D/A digital-to-analogue conversion end of described microcontroller is one, be used for output laser bias current control signal, described buffer circuit comprises: a low-pass filter circuit and ratio amplifying circuit mutually together, the input of described low-pass filter circuit connects the output B of single-pole single-throw switch (SPST), described in-phase proportion amplifying circuit comprises: an operational amplifier, first divider resistance and second divider resistance, the positive input terminal of described operational amplifier connects the output of low-pass filter circuit, its negative input end is provided with two shunt: first is electrically connected an end of first divider resistance, this divider resistance other end ground connection along separate routes; Second is electrically connected an end of second divider resistance along separate routes, and the 3rd link B1 of this divider resistance other end and described single-pole double-throw switch (SPDT) is electrically connected the A/D analog-to-digital conversion end of described microcontroller.
The D/A digital-to-analogue conversion end of described microcontroller is two, and one of them is used for output laser bias current control signal, and another is electrically connected the 3rd link B1 of described single-pole double-throw switch (SPDT); Described buffer circuit comprises: a low-pass filter circuit and an operational amplifier, and the input of described low-pass filter circuit connects the output B of single-pole single-throw switch (SPST), and its output connects the positive input terminal of described operational amplifier; The negative input end and the output of operational amplifier interconnect.
Described low-pass filter circuit is the single order low-pass filter circuit, comprise: first filter resistance and first filter capacitor, the positive input terminal of described operational amplifier connects an end of described first filter capacitor and connects the output B of described single-pole single-throw switch (SPST), the other end ground connection of described first filter capacitor by first filter resistance.
Described low-pass filter circuit is the second-order low-pass filter circuit, comprise: first filter resistance, first filter capacitor, second filter resistance, second filter capacitor, the positive input terminal of described operational amplifier connects an end of described second filter capacitor and is electrically connected the output B of described single-pole single-throw switch (SPST) by described first filter resistance and second filter resistance series connection back, one end of first filter capacitor is connected between first filter resistance and second filter resistance, and the other end of described first filter capacitor and second filter capacitor is ground connection respectively.
Described low-pass filter circuit is the second-order low-pass filter circuit, comprise: first filter resistance, first filter capacitor, second filter resistance, second filter capacitor, the positive input terminal of described operational amplifier connects an end of described second filter capacitor and passes through described first filter resistance and the output B of the described single-pole single-throw switch (SPST) of second filter resistance series connection back electrical connection, the other end ground connection of described second filter capacitor; One end of first filter capacitor is connected between first filter resistance and second filter resistance, and the other end connects the output of described operational amplifier.
Because technique scheme has adopted burst sampling holding circuit and sampling compensating circuit, not only can guarantee ONU optical module luminous power real-time stabilization under the burst operating state, also guaranteed the relative stability of ONU optical module extinction ratio under the burst operating state.In addition because optical network system manufacturer is to the continuous technology of upgrading requirement of ONU optical module function, external burst automatic optical power control circuit also be convenient to expanded function (as, TX-SD, TX Power Monitor etc.) the requirement of upgrading circuit design.
Description of drawings
Fig. 1 represents that prior art ONU optical module adopts built-in burst APC circuit frame principle figure.
Fig. 2 represents that the ONU optical module adopts the external burst automatic optical power control circuit of the utility model frame principle figure.
Fig. 3 represents the external burst automatic optical power control circuit of the utility model shown in Figure 2 frame principle figure first embodiment.
Fig. 4 represents external burst automatic optical power control circuit schematic diagram shown in Figure 3.
Fig. 5 represents the external burst automatic optical power control circuit of the utility model shown in Figure 2 frame principle figure second embodiment.
Fig. 6 represents external burst automatic optical power control circuit schematic diagram shown in Figure 5.
Fig. 7 A represents first kind of embodiment circuit diagram of low-pass filter circuit shown in Figure 3.
Fig. 7 B represents first kind of embodiment circuit diagram of low-pass filter circuit shown in Figure 3.
Fig. 7 C represents first kind of embodiment circuit diagram of low-pass filter circuit shown in Figure 3.
Embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
As shown in Figure 2, ONU optical module laser driver circuit, comprise: be provided with laser, microcontroller, open loop laser driver chip and the external burst automatic optical power control circuit of laser diode LD and diode PD backlight, integrated modulated current circuit, bias current circuit etc. in the open loop laser driver chip.
External burst automatic optical power control circuit first embodiment as shown in Figure 3 and Figure 4, comprise: a sampling resistor 1, a burst sampling holding circuit 2, a buffer circuit 3A, a sampling compensating circuit 4 and a microcontroller 5A, this controller is provided with an A/D analog-to-digital conversion end and a D/A digital-to-analogue conversion end, and the laser bias current control signal is exported by D/A digital-to-analogue conversion end.One end ground connection of sampling resistor 1, the input of the other end and described burst sampling holding circuit 2 is connected with the diode cathode backlight of laser, the output of burst sampling holding circuit 2 connects the input of buffer circuit 3A, and the output of buffer circuit 3A is connected with the A/D analog-to-digital conversion end of microcontroller 5A.Sampling compensating circuit 4 is connected between microcontroller 5A and the burst sampling holding circuit 2, and BEN synchronizing signal (Burst Enable is called for short BEN) acts on burst sampling holding circuit 2 and sampling compensating circuit 4.Burst sampling holding circuit 2, comprise: a single-pole single-throw switch (SPST) 21 and a sampling keep electric capacity 22, the input A of single-pole single-throw switch (SPST) 21 connects the diode cathode backlight of laser, and the output B of single-pole single-throw switch (SPST) 21 connects sampling and keeps electric capacity 22 1 ends, this electric capacity other end ground connection.Buffer circuit 3A comprises: a low-pass filter circuit 31A and ratio amplifying circuit mutually together, the input of low-pass filter circuit 31A connects the output B of single-pole single-throw switch (SPST) 21, the in-phase proportion amplifying circuit comprises: an operational amplifier 32, first divider resistance 33 and first divider resistance 34, the positive input terminal of operational amplifier 32 connects the output of low-pass filter circuit 31A, its negative input end is provided with two shunt: first is electrically connected an end of first divider resistance 33, this divider resistance other end ground connection along separate routes; Second is electrically connected an end of first divider resistance 34 along separate routes, and the 3rd link B1 of this divider resistance other end and single-pole double-throw switch (SPDT) 42 is electrically connected the output of operational amplifier 32.Sampling compensating circuit 4 comprises: a discharge resistance 41, single-pole double-throw switch (SPDT) 42 and an energy pre-storage electric capacity 43, single-pole double-throw switch (SPDT) 42 are provided with the end that the first link A0 is electrically connected energy pre-storage electric capacity 43, this electric capacity other end ground connection; The second link B 0 connects the output B of single-pole single-throw switch (SPST) 21 by discharge resistance 41; The 3rd link B1 is electrically connected the A/D analog-to-digital conversion end of microcontroller 5.
External burst automatic optical power control circuit second embodiment as shown in Figure 5 and Figure 6 comprises: a sampling resistor 1, a burst sampling holding circuit 2, a buffer circuit 3B, a sampling compensating circuit 4 and a microcontroller 5B.This embodiment circuit theory is close with first embodiment, and its difference is: buffer circuit 3B is different with microcontroller 5B.Microcontroller 5B is provided with an A/D analog-to-digital conversion end and two D/A digital-to-analogue conversion ends, one of them D/A digital-to-analogue conversion end is used for output laser bias current control signal, and another D/A digital-to-analogue conversion end is electrically connected the 3rd link B1 of the single-pole double-throw switch (SPDT) 42 of sampling compensating circuit 4.Buffer circuit 3B comprises: a low-pass filter circuit 31B and an operational amplifier 32, the input of low-pass filter circuit 31B connects the output B of the single-pole single-throw switch (SPST) 21 of burst sampling holding circuit 2, the positive input terminal of its output concatenation operation amplifier 32.The negative input end and the output of operational amplifier 32 interconnect.Low- pass filter circuit 31A, 31B among two embodiment are general.
Low-pass filter circuit shown in Fig. 7 A is the single order low-pass filter circuit, comprise: the first filter resistance R31 and the first filter capacitor C31, the positive input terminal of operational amplifier 32 connects the end of the first filter capacitor C31 and passes through the output B that the first filter resistance R31 connects single-pole single-throw switch (SPST) 21, the other end ground connection of the first filter capacitor C31.
Low-pass filter circuit 31 shown in Fig. 7 B is the second-order low-pass filter circuit, comprise: the first filter resistance R31, the first filter capacitor C31, the second filter resistance R32, the second filter capacitor C32, the positive input terminal of operational amplifier 32 connects the end of the second filter capacitor C32 and is electrically connected the output B of single-pole single-throw switch (SPST) 21 by the first filter resistance R31 and second filter resistance R32 series connection back, the end of the first filter capacitor C31 is connected between the first filter resistance R31 and the second filter resistance R32, and the other end of the first filter capacitor C31 and the second filter capacitor C32 is ground connection respectively.
Low-pass filter circuit 31 shown in Fig. 7 C is the second-order low-pass filter circuit, comprise: the first filter resistance R31, the first filter capacitor C31, the second filter resistance R32, the second filter capacitor C32, the positive input terminal of operational amplifier 32 connects the end of the second filter capacitor C32 and passes through the first filter resistance R31 and the output B of second filter resistance R32 series connection back electrical connection single-pole single-throw switch (SPST) 21, the other end ground connection of the second filter capacitor C32; The end of the first filter capacitor C31 is connected between the first filter resistance R31 and the second filter resistance R32, the output of other end concatenation operation amplifier 32.
External burst automatic optical power control circuit of the present utility model, its operation principle is as follows:
When the sampled level that is obtained by sampling resistor 1 was a square-wave signal with the BEN signal Synchronization, when (BEN ON), laser diode LD was luminous when the BEN signal is effective, and back facet current Im flows through sampling resistor 1, formation real-time and effective sampled level V
Sample, when the BEN invalidating signal (BEN OFF), laser diode LD turn-offs, and the sampled level of sampling resistor 1 is zero.Single-pole single-throw switch (SPST) 21 is under the control of BEN signal Synchronization, to sampled level V
SampleKeep, when the BEN signal was effective, single-pole single-throw switch (SPST) 21 closures made sampling keep electric capacity 22 chargings, carry out level and keep, and when the BEN invalidating signal, single-pole single-throw switch (SPST) 21 disconnects, and avoids sampling to keep electric capacity 22 discharges.Sampling keeps the level of electric capacity 22 owing to the modulation signal that exists among the back facet current Im to a certain degree, so sampled level V
SampleBe not to be steady clean level, need carry out sending to again to operational amplifier after the low-pass filtering, avoided sampling to keep the level of electric capacity 22 owing to the discharge of low-pass filter circuit end causes damage, level by operational amplifier output is that a stable clean direct current is flat, and the A/D analog-to-digital conversion port that can be input to microcontroller is through carrying out the control of bias current after the bottom layer treatment.No matter be that first embodiment is flat by galvanic current that amplifies through ratio of in-phase proportion amplifying circuit output, still second embodiment is that two kinds of embodiments all can utilize the DC level after the amplification to compensate the underspeed problem of burst sampling holding circuit 2 by microcontroller 5 DC level of one of D/A digital-to-analogue conversion port output and the proportional amplification of sampled value of its A/D analog-to-digital conversion end wherein.
Under the control of BEN synchronizing signal, two passages of single-pole double-throw switch (SPDT) 42 can carry out conducting and disconnection constantly in difference, when the BEN signal is effective, and the first link A0 and the second link B0 passage conducting, the first link A0 and the 3rd link B1 passage disconnect; When the BEN invalidating signal, the first link A0 and the second link B0 passage disconnect, the first link A0 and the 3rd link B1 passage conducting.As shown in Figure 4, when the BEN invalidating signal, the DC level of in-phase proportion amplifier circuit 32 outputs is charged to energy pre-storage electric capacity 43 by the first link A0 and the 3rd link B1 passage; As shown in Figure 6, when the BEN invalidating signal, the output level of the D/A analog-to-digital conversion port of microcontroller 5 charges to energy pre-storage electric capacity 43 by the first link A0 and the 3rd link B1 passage; Execute routine common feature for two: when the BEN signal was effective, the electric charge on the energy pre-storage electric capacity 43 kept electric capacity 22 to charge by the first link A0 and the second link B0 passage to sampling.
Owing to be subjected to the influence of other factorses such as PD bandwidth, the foundation of back facet current Im needs 300～400ns time just can finish, thus when short bag, influenced by this, under the adjustment of external burst automatic optical power control circuit, can make bias current Ibias increase, cause extinction ratio to reduce; When long bag, because back facet current Im set up and finished, so the problem can not produce short bag the time.During at short bag, back facet current Im sets up delay problem slow and that sampling keeps electric capacity 22 to bring, accelerates sampling and keeps level V on the electric capacity 22
SampleThe speed of setting up, so adopt 4 pairs of samplings of sampling compensating circuit to keep electric capacity 22 to carry out the short time charging charge compensation of (approximately hundreds of ns).In the practical application, should note the output level of D/A digital-to-analogue conversion port of the multiplication factor of in-phase proportion amplifying circuit or microcontroller 5 and the proportionate relationship of A/D modulus sampled level, to reach stablizing of the long sampled level down of different bags.
Claims (8)
1. external burst automatic optical power control circuit, it is characterized in that, comprise: a sampling resistor, a burst sampling holding circuit, a buffer circuit, a sampling compensating circuit and a microcontroller, this controller is provided with an A/D analog-to-digital conversion end and at least one D/A digital-to-analogue conversion end; One end ground connection of described sampling resistor, the input of the other end and described burst sampling holding circuit is connected with the diode cathode backlight of laser, the output of described burst sampling holding circuit connects the input of described buffer circuit, and the output of buffer circuit is connected with the A/D analog-to-digital conversion end of described microcontroller; Described sampling compensating circuit is connected between described microcontroller and the burst sampling holding circuit, and the BEN synchronizing signal acts on described burst sampling holding circuit and sampling compensating circuit.
2. according to the described external burst automatic optical power control circuit of claim 1, it is characterized in that, described burst sampling holding circuit, comprise: a single-pole single-throw switch (SPST) and a sampling keep electric capacity, the input A of described single-pole single-throw switch (SPST) connects the diode cathode backlight of described laser, its output B connects described sampling and keeps electric capacity one end, this electric capacity other end ground connection.
3. external burst automatic optical power control circuit according to claim 2, it is characterized in that, described sampling compensating circuit, comprise: a discharge resistance, single-pole double-throw switch (SPDT) and an energy pre-storage electric capacity, described single-pole double-throw switch (SPDT) is provided with the end that the first link A0 is electrically connected described energy pre-storage electric capacity, this electric capacity other end ground connection; The second link B0 connects the output B of single-pole single-throw switch (SPST) by described discharge resistance; The 3rd link B1 is the input of sampling compensating circuit.
4. external burst automatic optical power control circuit according to claim 3, it is characterized in that, the D/A digital-to-analogue conversion end of described microcontroller is one, be used for output laser bias current control signal, described buffer circuit comprises: a low-pass filter circuit and ratio amplifying circuit mutually together, the input of described low-pass filter circuit connects the output B of single-pole single-throw switch (SPST), described in-phase proportion amplifying circuit comprises: an operational amplifier, first divider resistance and second divider resistance, the positive input terminal of described operational amplifier connects the output of low-pass filter circuit, its negative input end is provided with two shunt: first is electrically connected an end of first divider resistance, this divider resistance other end ground connection along separate routes; Second is electrically connected an end of second divider resistance along separate routes, and the 3rd link B1 of this divider resistance other end and described single-pole double-throw switch (SPDT) is electrically connected the A/D analog-to-digital conversion end of described microcontroller.
5. external burst automatic optical power control circuit according to claim 3, it is characterized in that, the D/A digital-to-analogue conversion end of described microcontroller is two, and one of them is used for output laser bias current control signal, and another is electrically connected the 3rd link B1 of described single-pole double-throw switch (SPDT); Described buffer circuit comprises: a low-pass filter circuit and an operational amplifier, and the input of described low-pass filter circuit connects the output B of single-pole single-throw switch (SPST), and its output connects the positive input terminal of described operational amplifier; The negative input end and the output of operational amplifier interconnect.
6. according to claim 4 or 5 described external burst automatic optical power control circuits, it is characterized in that, described low-pass filter circuit is the single order low-pass filter circuit, comprise: first filter resistance and first filter capacitor, the positive input terminal of described operational amplifier connects an end of described first filter capacitor and connects the output B of described single-pole single-throw switch (SPST), the other end ground connection of described first filter capacitor by first filter resistance.
7. according to claim 4 or 5 described external burst automatic optical power control circuits, it is characterized in that, described low-pass filter circuit is the second-order low-pass filter circuit, comprise: first filter resistance, first filter capacitor, second filter resistance, second filter capacitor, the positive input terminal of described operational amplifier connects an end of described second filter capacitor and is electrically connected the output B of described single-pole single-throw switch (SPST) by described first filter resistance and second filter resistance series connection back, one end of first filter capacitor is connected between first filter resistance and second filter resistance, and the other end of described first filter capacitor and second filter capacitor is ground connection respectively.
8. according to claim 4 or 5 described external burst automatic optical power control circuits, it is characterized in that, described low-pass filter circuit is the second-order low-pass filter circuit, comprise: first filter resistance, first filter capacitor, second filter resistance, second filter capacitor, the positive input terminal of described operational amplifier connects an end of described second filter capacitor and passes through described first filter resistance and the output B of the described single-pole single-throw switch (SPST) of second filter resistance series connection back electrical connection, the other end ground connection of described second filter capacitor; One end of first filter capacitor is connected between first filter resistance and second filter resistance, and the other end connects the output of described operational amplifier.
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| CN102209410A (en) * | 2010-03-29 | 2011-10-05 | 深圳新飞通光电子技术有限公司 | External sudden automatic optical-power control circuit |
| CN102223180A (en) * | 2011-07-14 | 2011-10-19 | 成都新易盛通信技术有限公司 | Optical module with low power consumption and realizing method thereof |
| CN102269782A (en) * | 2011-06-28 | 2011-12-07 | 成都新易盛通信技术有限公司 | Method for determining resistance value in optical module production |
| CN102281101A (en) * | 2011-06-29 | 2011-12-14 | 成都优博创技术有限公司 | Method and device for timely monitoring and maintaining emission light power in burst mode |
| CN102546028A (en) * | 2012-03-05 | 2012-07-04 | 深圳市共进电子股份有限公司 | Discretely designed 10G burst transmitter |
| CN110010089A (en) * | 2019-05-28 | 2019-07-12 | 京东方科技集团股份有限公司 | Backlight drive circuit and driving method, backlight module, display module |
| CN110971990A (en) * | 2019-11-18 | 2020-04-07 | 武汉光谷信息光电子创新中心有限公司 | Method and device for detecting SD/LOS (secure digital/optical line segment) of OLT (optical line terminal) optical module |
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- 2010-03-29 CN CN2010201480658U patent/CN201623362U/en not_active Expired - Lifetime
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| CN102209410A (en) * | 2010-03-29 | 2011-10-05 | 深圳新飞通光电子技术有限公司 | External sudden automatic optical-power control circuit |
| CN102209410B (en) * | 2010-03-29 | 2015-01-07 | 深圳新飞通光电子技术有限公司 | External sudden automatic optical-power control circuit |
| CN102269782A (en) * | 2011-06-28 | 2011-12-07 | 成都新易盛通信技术有限公司 | Method for determining resistance value in optical module production |
| CN102281101A (en) * | 2011-06-29 | 2011-12-14 | 成都优博创技术有限公司 | Method and device for timely monitoring and maintaining emission light power in burst mode |
| CN102281101B (en) * | 2011-06-29 | 2014-02-05 | 成都优博创技术有限公司 | Method and device for timely monitoring and maintaining emission light power in burst mode |
| CN102223180A (en) * | 2011-07-14 | 2011-10-19 | 成都新易盛通信技术有限公司 | Optical module with low power consumption and realizing method thereof |
| CN102223180B (en) * | 2011-07-14 | 2014-05-14 | 成都新易盛通信技术股份有限公司 | Optical module with low power consumption and realizing method thereof |
| CN102546028A (en) * | 2012-03-05 | 2012-07-04 | 深圳市共进电子股份有限公司 | Discretely designed 10G burst transmitter |
| CN102546028B (en) * | 2012-03-05 | 2014-07-30 | 深圳市共进电子股份有限公司 | Discretely designed 10G burst transmitter |
| CN110010089A (en) * | 2019-05-28 | 2019-07-12 | 京东方科技集团股份有限公司 | Backlight drive circuit and driving method, backlight module, display module |
| CN110971990A (en) * | 2019-11-18 | 2020-04-07 | 武汉光谷信息光电子创新中心有限公司 | Method and device for detecting SD/LOS (secure digital/optical line segment) of OLT (optical line terminal) optical module |
| CN113346952A (en) * | 2021-08-06 | 2021-09-03 | 深圳市迅特通信技术股份有限公司 | Burst transmission coupling circuit of optical module |
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