CN1797994A - Bias circuit for direct modulated laser - Google Patents
Bias circuit for direct modulated laser Download PDFInfo
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- CN1797994A CN1797994A CNA2004100919296A CN200410091929A CN1797994A CN 1797994 A CN1797994 A CN 1797994A CN A2004100919296 A CNA2004100919296 A CN A2004100919296A CN 200410091929 A CN200410091929 A CN 200410091929A CN 1797994 A CN1797994 A CN 1797994A
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Abstract
Being setup inside optical transmitting module, the bias circuit includes following parts: a laser drive of optical transmitting module of using positive power supplier; a designed triode drive circuit between directive modulated lasers; and a conversion circuit of positive / negative power supply of providing negative power source for triode drive circuit and the said lasers. The output of voltage controlled current source is the input control signal of the triode drive circuit. Current change outputted from voltage-controlled current source of the drive is in use for controlling voltage of base pole in triode, and then current of collector is in use for driving laser to output optical power corresponding to current change. Control loop of automatic control circuit for optical power is formed through drive circuit of triode. Features are: simple and high efficiency, raised stability of module performance, and reduced cost.
Description
Technical field
The present invention relates to be applicable to the bias circuit for direct modulated laser of digital fiber transmission system technical field, in particular a kind of circuit for optical transmission module realization directly modulated lasers bias current power supply in digital fiber communication system or the digital fiber-optic network.
Background technology
The optical transmission system of prior art uses the 2.5Gb/s optical transmission module to send the light signal business, comprises STM-16 signal and OC-48 signal, and their speed is 2488.320Mb/s.Usually a large amount of use of the optical transmission module in the WDM optical transmission system has refrigeration directly modulated lasers, this laser to satisfy the transmission performance requirement of 80Km～360Km.Provide bias current and modulated current by laser driver chip and peripheral circuit for directly modulated lasers, thereby realize the electricity/light conversion of digital signal, the biasing circuit of directly modulated lasers and modulation circuit design playing an important role for the optical transmission module overall performance.
Current 2.5Gb/s has the refrigeration directly modulated lasers mainly to adopt 14 pin butterfly encapsulating structures, at encapsulating structure inner integrated laser tube core, the PIN pipe of realizing the average light power monitoring and negative tempperature coefficient thermistor and the TEC device that is used for die temperature control.Refrigeration directly modulated lasers intraware and pin definitions schematic diagram are arranged as shown in Figure 1, intraware comprises LD, power monitoring PIN manages dorsad, thermistor TH and TEC refrigerator, link to each other by a dotted line between laser anode and the individual laser package among the figure, represent that most of producers link together laser anode and encapsulation in laser inside, consider and need compatible many producers laser product on the modular design, and the laser anode of most of laser producer links with package casing is electric in that encapsulation is inner, charged for fear of the laser shell, therefore the laser anode must determine directly modulated lasers need adopt negative supply to power bias current to laser is provided together with laser shell good earth.
Laser bias current provides operate as normal required working direct current for direct modulated laser, this electric current during greater than threshold current laser just can be operated in the stimulated radiation state.The High Speed Modulation electric current can be carried on the bias current by dual mode, and a kind of is direct current DC coupled modes, and promptly modulated current directly is superimposed upon on the bias current, and driver directly is connected with the high frequency modulated interface of laser.Another kind of promptly modulated current is superimposed upon on the bias current with the form of positive and negative alternation in order to exchange the AC coupled modes, and driver and laser high-frequency modulation interface are by the electric capacity AC coupled.
The laser P/I curve of two kinds of coupled modes that provide as Fig. 2, wherein, when the high-frequency signal that Fig. 2 A has provided driver and laser adopts direct-coupled mode, the relation of laser bias current Ibias and modulated current Imod and laser output light signal, when the high-frequency signal that Fig. 2 B has provided driver and laser adopted the mode of AC coupled, Ibias and Imod and laser were exported the relation of light signal.From the P/I curve of first kind of coupled modes, can see, under the constant prerequisite of laser modulation current Imod, the operating current Iop=Ibias+Imod/2 of laser, change bias current Ibias and will cause the variation of laser works electric current I op, thereby cause the change of exporting average light power Pav.In the P/I of second kind of coupled modes curve, therefore the operating current Iop=Ibias of laser changes the change that bias current Ibias will directly cause the output average light power.Adopt the modular circuit design of different electric power systems for driver and directly modulated lasers, driver can only adopt with the high-frequency signal of directly modulated lasers and exchange the AC coupled modes, therefore under this coupled modes, the size of the bias current Ibias of laser has directly determined the size of laser output average light power Pav.
For light communication system, the stable resistance to overturning for system of the average power of light carrier plays crucial effects, has therefore comprised in the optical transmission module design and has kept the stable control circuit of laser output power.The photogenerated current Impd corresponding with laser output average luminous power that this circuit uses the optical power monitoring PIN pipe in the laser assembly to provide comes the operating current Iop of FEEDBACK CONTROL laser, operating current Iop is the average electric current that flows through laser, and this electric current has determined the size of laser output average luminous power Pav.Stablize the operating current Iop of laser, just can reach the purpose of stable laser Output optical power.Most of for this reason laser driver chips are all integrated keep the laser works electric current steady control circuit, it introduces internal control circuit with the photogenerated current of optical power monitoring PIN pipe as pilot signal, come to provide bias current by a voltage-controlled current source for laser, this circuit can be realized the automatic control of laser output average light power according to the size that laser bias current is adjusted in the variation that laser is exported average light power automatically, the luminous power automatic control circuit APC (Automatic Power Control) that generally adopts on Here it is the optical transmission module.
Provided the theory diagram of basic APC circuit as Fig. 3.In this APC circuit, driver and laser all adopt the negative supply power supply, optical power monitoring PIN pipe in the laser assembly provides the corresponding photogenerated current Impd with laser output average luminous power Pav, Impd offers the internal control circuit of driver, by fixed resistance Impd is converted to voltage signal, compare with user's setting voltage Power Set with this voltage signal, operational amplification circuit changes voltage difference into the driving voltage of voltage-controlled current source, the output current of voltage-controlled current source adopts the direct-current coupling mode to offer laser, be the bias current Ibias of laser, the relation of the operating current of laser and Output optical power is shown in Fig. 2 A at this moment, under the constant prerequisite of laser modulation current, the size of adjusting bias current Ibias just can realize the purpose of stable laser power output Pav.Present most of laser drivers are inner integrated this part circuit has only been reserved the interface that luminous power is provided with port and bias current and modulated current are provided for laser assembly.
In this APC circuit, adopt the interface circuit design of the driver of negative supply power supply can become very complicated, particularly generally use digital regulation resistance to carry out under the situation of parameter adjustment and control in inside modules, if digital regulation resistance is done parameter adjustment in the negative supply environment, then communication interface of digital regulation resistance etc. need be by level conversion in the positive supply environment.Optical module generally uses digital regulation resistance to realize adjusting the parameter of control at present, and the communication interface conversion also can correspondingly increase, and this causes the modular circuit design redundant complicated.If driver adopts the positive supply power supply, then control circuit and interface circuit design are simplified, but the voltage-controlled current source of driver can't directly provide bias current to directly modulated lasers, if the voltage-controlled current source that does not use driver to provide provides bias current as laser, the APC circuit that then needs to cast aside the integrated APC circuit of internal drive and redesign laser, the circuit design of optical transmission module is just too complicated like this.
In addition, the positive and negative power supply of optical transmission module can exert an influence to the performance of module when fluctuation occurring, and particularly the fluctuation meeting of negative supply impacts the stability of APC circuit, and this just requires to increase the circuit design of opposing positive-negative power fluctuation in module.In existing technical literature and patent, there is not the design of biasing circuit between the driver that relates to the power supply of directly modulated lasers and positive supply about directly modulated lasers APC circuit design.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The purpose of this invention is to provide a kind of bias circuit for direct modulated laser, interface circuit as the bias current between a kind of directly modulated lasers and the driver, the problem of biasing circuit design between the driver of solution directly modulated lasers and positive supply power supply provides a kind of advantages of simplicity and high efficiency implementation flexibly; Be implemented in the biasing circuit design of driver and directly modulated lasers under the positive supply condition of power supply, adopt single positive supply power supply in inside modules, use the positive-negative power translation circuit to come to provide negative supply as directly modulated lasers separately, thereby avoided the influence of negative supply fluctuation to module performance, increase the stability of module product, become one of challenging technology in the optical transmission module design.
Technical scheme of the present invention is as follows:
A kind of bias circuit for direct modulated laser, it is arranged in the optical transmission module, this circuit comprises the laser intraware, described laser intraware comprises PIN pipe and the laser of realizing the average light power monitoring, described laser is used to carry out the output of luminous power, and described PIN pipe is used to respond to the output monitoring current corresponding with luminous power; Wherein, described circuit comprises that also one adopts the laser driver of the optical transmission module of positive supply power supply, and driver and the transistor drive circuit that directly designs between the modulated laser, and positive-negative power translation circuit provides negative supply for described transistor drive circuit and described laser;
Described laser driver comprises the feedback control circuit of luminous power automatic control circuit, and its voltage-controlled current source is output as the input control signal of described transistor drive circuit;
Described resistor voltage divider circuit is used to control described transistor base voltage with the electric current variation of the voltage-controlled current source output of described driver, drives the luminous power of described laser output respective change again with collector current;
Between driver control circuit and laser intraware, form luminous power automatic control circuit control loop by transistor drive circuit.
Described circuit, wherein, described transistor drive circuit comprises a resistor voltage divider circuit and the stable triode of a temperature characterisitic, described resistor voltage divider circuit comprises a plurality of divider resistances of series connection, and between described divider resistance, connect the base stage of described triode, described resistor voltage divider circuit is the change transitions of the driver voltage-controlled current source output current of positive supply power supply the variation of described transistor base voltage, thereby causes the variation of transistor collector electric current.
Described circuit, wherein, described transistor drive circuit also comprises voltage stabilizing circuit, and it comprises a voltage stabilizing didoe and at least one voltage regulation resistance, and described transistor drive circuit electrically connects by described voltage stabilizing didoe and described laser driver.
A kind of bias circuit for direct modulated laser provided by the present invention, adopt the method for the invention, laser driver can adopt the positive supply power supply, by transistor drive circuit of design between driver and laser, having solved the APC feedback control circuit needs the problem of design iterations, adopt the positive-negative power translation circuit to come to provide negative supply, increased the stability of APC circuit working, eliminated the fluctuation of module negative supply its Effect on Performance for transistor drive circuit and laser; Compared with prior art, the optical transmission module circuit design is simply efficient, under the prerequisite that guarantees the optical transmission module service behaviour, has improved the stability of module performance, and that has reduced circuit repeats and realize cost.
Description of drawings
Fig. 1 is the laser intraware schematic diagram of prior art;
Fig. 2 A and Fig. 2 B are respectively the DC coupled mode of prior art and the P/I curve chart under the AC coupled mode;
Fig. 3 is the schematic block circuit diagram of the basic luminous power automatic control circuit APC of prior art;
Fig. 4 is the APC schematic block circuit diagram of the single positive supply power supply of the employing in the described luminous power automatic control circuit of the present invention;
Fig. 5 is the performance diagram that the typical PNP triode Vbe voltage in the circuit of the present invention changes with Ic;
Fig. 6 is the transistor drive circuit schematic diagram of bias circuit for direct modulated laser of the present invention;
Fig. 7 has the temperature variant curve chart of refrigeration directly modulated lasers Output optical power in the circuit of the present invention;
Fig. 8 has the curve chart of refrigeration directly modulated lasers Output optical power with the module for power supply change in voltage in the circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, will be described in detail concrete preferred embodiment of the present invention.
Bias circuit for direct modulated laser of the present invention, its core technology is at the driver of the optical transmission module that adopts the positive supply power supply and directly designs a transistor drive circuit between the modulated laser that this transistor drive circuit and laser provide negative supply by a positive-negative power translation circuit; The voltage-controlled current source of use driver is exported and is controlled transistor base voltage, thereby the collector current of control triode comes drive laser with collector current again.
Circuit of the present invention is using resistor voltage divider circuit to realize control between the different electrical power power supply circuits dexterously on the circuit design, by this transistor drive circuit and a positive-negative power translation circuit driver and the laser intraware of positive supply power supply are connected, make the APC feedback control loop rebulid, the biasing circuit design of optical transmission module is greatly simplified.Do not use the extraneous negative supply that provides to be transistor drive circuit and laser power supply in the circuit, power and be to use the positive-negative power translation circuit to produce a metastable negative supply from positive supply, because the output of the voltage of power converting circuit is subjected to the influence of input voltage fluctuation very little, thereby improved the stability of transistor drive circuit work, eliminated the influence of the variation of negative supply supply power voltage the APC circuit.
Bias circuit for direct modulated laser of the present invention, it has the refrigeration bias circuit for direct modulated laser as shown in Figure 4, comprise laser intraware, positive-negative power translation circuit, laser driver and several parts of transistor drive circuit, described laser intraware is realized the luminous power output of laser, and provides the monitoring current Impd corresponding with Output optical power for the APC circuit; The positive-negative power translation circuit is realized the conversion from the positive supply to the negative supply, for the bias current of laser provides negative supply; Laser driver has then comprised the feedback control circuit of APC, and the output of the voltage-controlled current source of driver becomes the input control signal of transistor drive circuit; Transistor drive circuit is made of a component piezoresistance and the stable PNP triode of temperature characterisitic.Described resistor voltage divider circuit is the change transitions of the driver voltage-controlled current source output current of positive supply power supply the variation of transistor base voltage, thereby cause the variation of transistor collector electric current, the collector current drive laser makes Output optical power make respective change.The PIN pipe of laser inside detects the variation of Output optical power, variation by photogenerated current feeds back to laser driver, driver is adjusted the size of voltage controlled current output current again according to the variation of photogenerated current, finally form complete reliable APC control loop.
All can form complete reliable APC control loop for most of directly modulated lasers, the forward voltage Vf of described directly modulated lasers is 1.2V～1.8V generally speaking, when laser adopts the negative supply power supply, the laser anode links to each other with ground level, and the voltage of laser cathode is lower than laser forward conduction voltage Vf
*Then laser unlatching work.Transistor drive circuit as shown in Figure 4, compare with traditional APC circuit, this circuit has been introduced a transistor drive circuit and a positive-negative power translation circuit, solved the bias current power supply of laser, driver still adopts the positive supply power supply, between driver control circuit and laser intraware, form the APC control loop by transistor drive circuit again, made full use of integrated APC observation circuit and the voltage controlled current Source drive of driver.
Use power converting circuit to come to provide negative supply simultaneously as transistor drive circuit and laser, the influence of having avoided power-supply fluctuation that this part circuit is caused, improved the stability of APC circuit working, the concrete application example of transistor drive circuit sees also shown in Figure 6.When its operation principle was amplified operating state for being in when triode, the size of laser bias current was by the base current decision of flowing through positive-negative-positive triode VT1, and it is that base voltage Vb is lower than laser forward conduction voltage Vf that triode enters the condition of amplifying operating state
*Add that positive-negative-positive triode economize on electricity presses Vbe, promptly Vb≤-Vf
*+ Vbe, wherein Vf
*Be the forward conduction voltage of laser, because laser works is under the situation of negative supply power supply, so Vf in the formula
*Before add negative sign, generally the representative value of the PNP triode Vbe of silicon materials is-0.7V.The electric current that flows through laser and triode this moment is less, and the pressure drop that electric current produces on resistance and filter inductance can be ignored.Along with base voltage Vb voltage continues to reduce, the base current of triode VT1 increases, and flows through the corresponding increase of emitter current of VT1, and promptly the bias current Ibias of laser increases, and the pressure drop on resistance and the inductance simultaneously increases, and laser forward voltage drop Vf increases.When Vb was reduced to certain numerical value, the Ibias that flows through laser just in time equaled the threshold current Ith of laser, and the base voltage Vb of this moment can be expressed as:
Vb＝Vf+Vbe+Ith*(R16//R17+RL9) (1)
R16//R17 is the parallel impedance of resistance R 16 and resistance R 17 in the following formula, and RL9 is the dc impedance of inductance L 9.When base voltage Vb voltage reduced again, laser forward voltage drop Vf increased, and Ibias continues to increase, and directly modulated lasers enters normal operating conditions, the corresponding increase of laser Output optical power Pav, and the P-I curve of the laser of employing AC coupled modes is shown in Fig. 2 B.This shows that base voltage Vb has determined transistor drive circuit to offer the size of the bias current Ibias of laser, Ibias is the Iop of laser, thereby has directly determined the size of laser Output optical power Pav.
The temperature characterisitic that it is pointed out that the PNP triode is one of key factor that influences this drive circuit operate as normal, and the economize on electricity of PNP triode generally presses Vbe to change along with ambient temperature.If suppose that the collector current Ic of triode is constant, Ie=Ic+Ib, wherein base current Ib is much smaller than collector current Ic, so can think that emitter current Ie is approximate constant, be that laser bias current Ibias is constant, along with the economize on electricity of variations in temperature triode is pressed Vbe and will be changed.
If this parameter is changed significantly under-55 ℃～150 ℃ ambient temperature, the variation delta Vb that then controls voltage base voltage Vb may exceed the adjustable range of transistor drive circuit, provided the characteristic curve of a typical PNP triode economize on electricity pressure Vbe as shown in Figure 5 with collector current Ic variation, comprising the influence of temperature to curve, if it is bigger that the economize on electricity of PNP triode presses Vbe to change, then need to redefine as the case may be circuit parameter under-55 ℃～150 ℃ ambient temperatures.Under different temperatures, the power output that the APC circuit will maintain the refrigeration directly modulated lasers is stable, mean that for the laser that adopts the AC coupled modes bias current Ibias should keep stable, the emitter current Ie that is transistor drive circuit keeps stable, can be similar to this moment to think that collector current Ic keeps stable.Hypothesis set electrode current Ic=50mA, as can be seen from the figure under the constant prerequisite of collector current Ic, Vbe voltage difference is pressed in the economize on electricity of varying environment temperature correspondence, under the ambient temperature of-55 ℃, 25 ℃ and 150 ℃ the economize on electricity of this PNP triode press Vbe voltage be respectively-0.95V ,-0.8V and-0.6, Δ Vbe=0.35V, Δ Vbe will be less than 0.35V in the normal operating temperature range of module.Therefore the variation of the base stage of PNP triode control voltage Vb under different temperatures will be less than 0.35V, and this can satisfy the requirement of application fully for circuit of the present invention.
Be comparatively practical transistor drive circuit as shown in Figure 6, this circuit is made up of two parts, first is the voltage stabilizing circuit that resistance R 6 and voltage stabilizing didoe VD8 constitute, when the pressure drop VDD on the VD8 is stabilized in 4.0V, this voltage stabilizing circuit can provide representative value 50mA electric current, consider that there is ± 5% fluctuation in module for power supply voltage VCC, so the minimum current that can provide is 37.5mA, maximum current is 62.5mA.The electric current that provides if desired is bigger, can change this circuit parameter and satisfy application demand.Second portion is the bleeder circuit that resistance R 4, R11 and R14 constitute between positive voltage VCC and negative supply voltage VEE, dividing potential drop between R11 and the R14 is as the base stage control voltage of triode VT1, the direct current of bleeder circuit and the bias current Ibias ' of laser driver output are crossed in resistance R 4 upper reaches, resistance R 4 is converted to change in voltage with the variation of the Ibias ' of driver like this, and this voltage variety offers the base stage of triode VT1 again by R11 and R14 dividing potential drop.The base voltage of VT1 is determined by following formula:
Vb＝VEE+R14*(VDD-VEE-R4*Ibias’)/(R4+R1I+R14) (2)
When the voltage-controlled current source output offset current Ib ias ' of driver is 0, the base voltage that obtains by resistance R 11 and R14 dividing potential drop is Vb=VEE+R14* (VDD-VEE)/(R4+R11+R14), this voltage equals forward conduction voltage, the economize on electricity of laser threshold current between the pressure drop that produces on resistance and the inductance and transistor base and emitter of laser again and presses sum, i.e. formula (1).When the voltage-controlled current source output current of driver changes, resistance R 4 will convert the variation of electric current to the variation of transistor base voltage, thereby change the size of emitter current, promptly change the size of laser bias current, the circuit parameter among Fig. 6 is applicable to the LC25W series laser of BOOKHAM.
The optical transmission module that is to use bias circuit for direct modulated laser technology of the present invention as shown in Figure 7 is under different temperatures, laser output power is with the curve of optical transmission module variation of ambient temperature, wherein provided the test result of 4 specimen, as can be seen from the figure the Output optical power of each optical transmission module changes under-15 ℃ to 65 ℃ ambient temperature less than ± 0.5dB, this deviation prove that new APC control circuit is satisfied in the industry to the index request of optical transmission module Output optical power stability to the control of laser output power in the scope that system design allows.
Be to use the optical transmission module of circuit engineering of the present invention to take place under ± 5% situation about changing as shown in Figure 8 at power supply VCC, laser output power is with the curve of power supply VCC change in voltage, provided the test result of above-mentioned 4 specimen equally, as can be seen from the figure when ± 5% variation takes place in power supply VCC voltage, the Output optical power of each optical transmission module almost remains unchanged, and proves that the APC control circuit that uses the technology of the present invention has good effect aspect the mains fluctuations overcoming.
In sum, use the APC circuit of the optical transmission module of the technology of the present invention to have the good temperature stability and the ability of anti-power-supply fluctuation; Adopt the method for the invention, compared with prior art, improved the flexibility of optical transmission module circuit design.Under the prerequisite that guarantees the optical transmission module performance, reduced the design iterations of circuit, reduced cost.
Should be understood that the above-mentioned description at specific embodiment of the present invention is too concrete, can not therefore be interpreted as the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (3)
1, a kind of bias circuit for direct modulated laser, it is arranged in the optical transmission module, this circuit comprises the laser intraware, described laser intraware comprises PIN pipe and the laser of realizing the average light power monitoring, described laser is used to carry out the output of luminous power, and described PIN pipe is used to respond to the output monitoring current corresponding with luminous power; It is characterized in that, described circuit comprises that also one adopts the laser driver of the optical transmission module of positive supply power supply, and driver and the transistor drive circuit that directly designs between the modulated laser, and positive-negative power translation circuit provides negative supply for described transistor drive circuit and described laser;
Described laser driver comprises the feedback control circuit of luminous power automatic control circuit, and its voltage-controlled current source is output as the input control signal of described transistor drive circuit; And
The electric current variation of the voltage-controlled current source output of described driver is used to control described transistor base voltage, drives the luminous power of described laser output respective change again with collector current;
Between driver control circuit and laser intraware, form luminous power automatic control circuit control loop by transistor drive circuit.
2, circuit according to claim 1, it is characterized in that, described transistor drive circuit comprises a resistor voltage divider circuit and the stable triode of a temperature characterisitic, described resistor voltage divider circuit comprises a plurality of divider resistances of series connection, and between described divider resistance, connect the base stage of described triode, described resistor voltage divider circuit is the change transitions of the driver voltage-controlled current source output current of positive supply power supply the variation of described transistor base voltage, thereby causes the variation of transistor collector electric current.
3, circuit according to claim 2, it is characterized in that, described transistor drive circuit also comprises voltage stabilizing circuit, and it comprises a voltage stabilizing didoe and at least one voltage regulation resistance, and described transistor drive circuit electrically connects by described voltage stabilizing didoe and described laser driver.
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| CNB2004100919296A CN100463380C (en) | 2004-12-27 | 2004-12-27 | Bias circuit for direct modulated laser |
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| CNB2004100919296A CN100463380C (en) | 2004-12-27 | 2004-12-27 | Bias circuit for direct modulated laser |
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| CN100463380C CN100463380C (en) | 2009-02-18 |
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| CN103050887A (en) * | 2012-12-26 | 2013-04-17 | 华为技术有限公司 | Electric absorption mode modulated laser system |
| CN103389450A (en) * | 2012-05-07 | 2013-11-13 | 中磊电子股份有限公司 | Light judgment circuit |
| CN104821484A (en) * | 2015-04-30 | 2015-08-05 | 无锡亮源激光技术有限公司 | Pulse modulation drive circuit of miniature semiconductor laser |
| CN109302237A (en) * | 2018-11-20 | 2019-02-01 | 中国电子科技集团公司第四十研究所 | A kind of laser modulation circuit and method based on white noise |
| CN109326954A (en) * | 2017-07-31 | 2019-02-12 | 科大国盾量子技术股份有限公司 | A kind of laser high-speed driving module for quantum communications single-photon source |
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| JP2000022631A (en) * | 1998-06-29 | 2000-01-21 | N Ii C Cable Media Kk | Method and circuit for controlling optical transmission |
| CN1147074C (en) * | 2000-01-27 | 2004-04-21 | 华为技术有限公司 | Single-fiber two-way integral optical module for burst reception |
| CN1426175A (en) * | 2001-12-12 | 2003-06-25 | 上海博为光电科技有限公司 | Burst type light sender |
| CN1192520C (en) * | 2002-01-30 | 2005-03-09 | 华为技术有限公司 | Digital regulated light transmission module and regulating method thereof |
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| CN103389450A (en) * | 2012-05-07 | 2013-11-13 | 中磊电子股份有限公司 | Light judgment circuit |
| CN103389450B (en) * | 2012-05-07 | 2015-11-04 | 中磊电子股份有限公司 | Light decision circuitry |
| CN103050887A (en) * | 2012-12-26 | 2013-04-17 | 华为技术有限公司 | Electric absorption mode modulated laser system |
| CN104821484A (en) * | 2015-04-30 | 2015-08-05 | 无锡亮源激光技术有限公司 | Pulse modulation drive circuit of miniature semiconductor laser |
| CN104821484B (en) * | 2015-04-30 | 2018-01-05 | 无锡亮源激光技术有限公司 | A kind of micro semiconductor laser device impulse modulation drive circuit |
| CN109326954A (en) * | 2017-07-31 | 2019-02-12 | 科大国盾量子技术股份有限公司 | A kind of laser high-speed driving module for quantum communications single-photon source |
| CN109326954B (en) * | 2017-07-31 | 2024-01-26 | 科大国盾量子技术股份有限公司 | Laser high-speed driving module for quantum communication single photon source |
| CN109302237A (en) * | 2018-11-20 | 2019-02-01 | 中国电子科技集团公司第四十研究所 | A kind of laser modulation circuit and method based on white noise |
| CN112929088A (en) * | 2019-12-06 | 2021-06-08 | 华为技术有限公司 | Central unit, remote unit, small station system and communication method |
| CN112929088B (en) * | 2019-12-06 | 2022-10-28 | 华为技术有限公司 | Central unit, remote unit, small station system and communication method |
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| CN100463380C (en) | 2009-02-18 |
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