CN103022895B - Laser tube power control system - Google Patents
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Abstract
The invention discloses a laser tube power control system. The laser tube power control system comprises a comparison circuit, an adjusting circuit and a clock control circuit, wherein the comparison circuit generates a binary comparison signal on the basis of an actual output signal and a target signal value; and the adjusting circuit comprises a current generating circuit and a driving circuit. The current generating circuit is used for generating an adjusting current according to the binary comparison signal, and the driving circuit is used for outputting a feedback control signal to a laser tube according to the adjusting current. The clock control circuit is used for generating clock signals and adjusting the adjusting current according to the clock signals. According to the laser tube power control system, modulation current and a bias circuit are adjusted according to detection results of a prior sent data frame within an interval of data sending, and accordingly influence of a modulation circuit on a main data channel is avoided.
Description
Technical field
The present invention relates to digit optical communication, more specifically, is a kind of laser tube power control system configured for laser diode.
Background technology
In digital optical data communication, laser diode (laser tube) is as the core devices of the electro-optic conversion of optical communication, and the stability of its luminous efficiency and the characteristics of luminescence has vital impact to whole communication link.How ensureing the Output optical power that laser diode keeps constant at ambient conditions, and how to ensure there are enough difference powers between output high level and output low level, is the key ensureing communication link reliability.
As shown in Figure 1, be relation curve between laser tube Output optical power (Pout) and drive current (Ilaser).Wherein P1, P2, to be laser tube raise and relation curve in degree of aging constantly increase situation between the Output optical power of (curve S) and drive current in temperature P3 and P4 gradually, and Ith1, Ith2, Ith3 and Ith4 are corresponding lasing threshold electric currents.As seen from the figure, laser tube is under different temperature conditions, and altering a great deal of lasing threshold electric current and luminous efficiency, particularly, at an elevated temperature, lasing threshold ER effect is large, and luminous efficiency reduces simultaneously.In addition, as can be seen from Fig. 1 also, along with the increase of laser tube service life, the emission effciency of laser tube also can reduce, and threshold current also can correspondingly increase.
In order to solve the problem, in the application, need laser tube configuration driven circuit (LDD), adopt power control (PC) circuit to realize the control to laser tube power output by adjustment drive current.In laser tube power controls, drive current comprises bias current and modulated current.Usually, bias current keeps the electric current of constant " 0 " power level in laser tube, and accordingly, modulated current keeps the electric current of constant " 1 " power level in laser tube.
Particularly, the power of laser tube is controlled usually there are two kinds of methods, a kind of is open Loop Power control method based on tabling look-up, the method is by realizing the characteristics of luminescence of testing laser pipe under condition of different temperatures, and be made into a form and exist in the memory of chip, actual when using, the temperature recorded according to temperature sensor is tabled look-up and is recalled corresponding driving current value.Another is the automatic growth control (APC) based on feedback control principle, is detected the actual transmission power obtaining laser tube by backlight, then compares with the power preset, automatically adjusts drive circuit, make it to be consistent with preset value.
At present, laser tube drive circuit provides above two kinds of control models to select for user simultaneously.Because the bias current of laser tube and modulated current all will control, may be combined with use in two modes.Above two kinds of control modes can be adopted respectively to control laser tube bias current and modulated current.Therefore, laser tube drive circuit can comprise following four kinds of integrated modes:
1, two open loop mode.In this mode, bias current and modulated current are all realized by open loop lookup table mode.
2, modulated current closed loop bias open current loop pattern.Namely modulated current is controlled by APC, and bias current is by control of tabling look-up.
3, modulated current open loop bias current closed loop mode, namely bias current is controlled by APC, and modulated current is by control of tabling look-up.
4, two close cycles pattern, namely bias current and modulated current are all controlled by APC.
For above-mentioned 4th kind of pattern, the Chinese invention patent application that publication number is CN101395771, application number is 200780007756.7 discloses a kind of double-closed-loop control scheme.As shown in Figure 2, be the circuit diagram of an execution mode of this control program.This laser drive circuit 100a can be connected to laser diode 103.Particularly, laser drive circuit 100a comprises the laser diode drive (LDD) 106 producing laser drive current.Laser diode drive 106, according to data input, exports the laser-driven signal being applied to laser diode 103.Laser diode 103 produces laser emission 109, and a part for laser emission 109 is guided to laser detector 113.Laser detector 113 produces the feedback signal proportional with laser emission 109, and this feedback signal is applied to laser drive circuit 100a.
In the circuit, the bias current IBias and the modulated current IMod that are transported to LDD 106 are produced by dual loop power control circuit 123a.Wherein, power control loop 126a produces bias current IBias, and power control loop 129a produces modulated current IMod.Power control loop 126a is substantially identical with the working method of power control loop 129a.For power control loop 126a, it comprises the current occuring circuit 131 for generation of bias current IBias, and current occuring circuit 131 comprises the digital to analog converter 133 and P0 counter 139 that are connected to laser diode drive 106.Further, power control loop 129a also comprises d type flip flop 146, and d type flip flop 146 produces output signal D0 and is applied to P0 counter 139.Further, power control loop 129a comprises comparator 153, and the signal that it produces the reset input R being applied to d type flip flop 146 exports R0.At two inputs of comparator 153, access digital to analog converter 159 and buffer/amplifier 166 respectively, wherein, P0 desired value (namely producing the electric current corresponding to expection laser power of logical zero) is converted to analog current by comparator 153, and the signal that laser photodiode 113 produces is applied to buffer/amplifier 166, comparator 153 to two input signals, and exports " 0 " or " 1 ".Simultaneously, clock signal C k is applied to d type flip flop 146 and P0 counter 139, and clock signal is in the time in half cycles cycle, the maximal phase etc. being greater than laser diode transmission is worth the duration of multiple continuous numbers, to guarantee that d type flip flop 146 does not straddle by data-signal the switching that input signal (namely P0 echo signal) may occur and affects.Working method and the 123a of power control loop 129a are similar.
By above-mentioned feedback circuit, according to target threshold current and feedback current, bias current and modulated current can be regulated.But, the control model of what the program was taked is bit-by-bit (BIT-TO-BIT), namely control for each emission mode, control for realizing BIT-TO-BIT power, amplifier 166 and comparator 153,156 need high-speed cruising, to meet the code check requirement of optical communication, therefore higher to the requirement of these devices, be required to be high-speed, high precision device; In addition, for ensureing APC precision, two high-speed, high precision comparators 153,156 need to ensure enough comparison precision, and high speed trans-impedance amplifier 166 needs enough large bandwidth, thus consumes a large amount of power consumption.And, foregoing circuit regulates bias current and modulated current at transmission data-signal device, therefore, if clock Ck adopts the clock frequency irrelevant with transmitting data, then APC possibly in transmission data aliasing enter undesired frequency content, on the other hand, if Ck signal extracts by sending data, to meet particular requirement, then need built-in high speed clock recovery signal, which again increases larger extra power consumption.Further, due to the restriction of this circuit loop bandwidth, sending superposition and the low-frequency ripple signal of APC loop bandwidth close frequencies in data, additional noise can be which in turns increases.
Summary of the invention
Object of the present invention, is to solve the problems referred to above existing in existing laser tube power control circuit, thus provides a kind of laser tube power control system of innovation.
Laser tube power control system of the present invention, for controlling the power output of laser tube, wherein, this laser tube produces real output signal to this laser tube power control system, this laser tube power control system output feedback ontrol signal is to laser tube, thus FEEDBACK CONTROL is carried out to the power of this laser tube, and, by data transmitter, transmission command signal is exported to this laser tube power control system, control this laser tube and send this real output signal, wherein, when this transmission command signal is enabled state, this laser tube sends this real output signal, when this transmission command signal is disable state, this laser tube stops sending this real output signal, this laser tube control system comprises:
Comparison circuit, this comparison circuit produces a binary comparison signal based on this real output signal and echo signal value;
Regulating circuit, this regulating circuit comprises a current occuring circuit and a drive circuit, this current occuring circuit is used for producing one according to this binary comparison signal and regulates electric current, and this drive circuit is used for exporting this feedback control signal to this laser tube according to this adjustment electric current;
Clock control circuit, for generation of clock signal, and regulates this adjustment electric current according to clock signal;
Wherein, this clock signal comprises the first clock signal and second clock signal, when this transmission command signal is from enabled state to disable state-transition, this first clock signal changes, and this binary comparison signal is latched, and, in the disable status slot of this transmission command signal, this second clock signal changes, and makes this regulating circuit carry out Current adjustment according to the comparison signal of this latch.
Preferably, described adjustment electric current is modulated current, and described echo signal value is correspond to the target current value that this laser tube exports high level power level.
Preferably, described adjustment electric current is bias current, and described echo signal value is the target current value corresponding to this laser tube output low level power level.
Preferably, described comparison circuit comprises a comparator, the inverting input of this comparator is connected with first current/voltage converter and the first analog to digital converter in turn, and described target current value is delivered to this first analog to digital converter, the normal phase input end of this comparator is connected with second current/voltage converter, and described real output signal is delivered to this second current/voltage converter.
Preferably, described comparison circuit comprises a comparator, the inverting input of this comparator is connected with first current/voltage converter and the first analog to digital converter in turn, and described target current value is delivered to this first analog to digital converter, the normal phase input end of this comparator is connected with a high-level detection and the second current/voltage converter in turn, and described real output signal is delivered to this second current/voltage converter.
Preferably, described clock control circuit comprises a clock controller for generation of clock signal and a d type flip flop, this clock controller produces described first clock signal and second clock signal, and this d type flip flop latches described binary comparison signal according to the transformation of described first clock signal.
Preferably, described current occuring circuit comprises a counter and a digital to analog converter, when described second clock signal changes in described disable status slot, this counter carries out computing according to binary comparison signal of described latch, and this digital to analog converter exports described adjustment electric current according to the value of this counter.
Preferably, described first current/voltage converter and described second current/voltage converter are low speed devices.
Preferably, described comparator is low speed devices.
Preferably, described first current/voltage converter is low speed devices, and described second current/voltage converter is high speed device.
Preferably, described comparator is low speed devices.
Preferably, described counter is bidirectional counter.
Laser tube power control system of the present invention, complete during data send and the detection of laser tube power output is compared, but power output is not regulated, and in the gap sending data, modulated current and biasing circuit are regulated according to the testing result of previous transmission Frame, thus avoids modulation loop on the impact of main data channel.
Accompanying drawing explanation
Fig. 1 is the relation curve under different temperature conditions and degree of aging between laser tube power output and drive current;
Fig. 2 is the structured flowchart of existing a kind of double-closed-loop control;
Fig. 3 is the schematic diagram of laser tube power control system of the present invention;
Fig. 4 is the composition schematic diagram of an execution mode of laser tube power control system of the present invention;
Fig. 5 is the Control timing sequence figure of the laser tube power control system in Fig. 4;
Fig. 6 is the waveform transformation figure of several signal of telecommunication in laser tube power control system in Fig. 4.
Embodiment
Below in conjunction with the drawings and specific embodiments, the formation of control system of the present invention and operation principle are described.In the de-scription, the function and effect for module conventional in prior art is only briefly described or omits, and to the part of outstanding feature of the present invention with illustrate in detail with the difference part in existing application.
With reference to Fig. 3, in general, the present invention aims to provide a kind of power control system 100 for laser tube, it controls for the power output of the laser tube 11 to laser tube assembly 10, wherein, laser tube 11 produces real output signal IPIN to laser tube power control system 100 by a laser detector 12 (such as photodiode), laser tube power control system 100 output feedback ontrol signal Id is to laser tube 11, thus FEEDBACK CONTROL is carried out to the power of this laser tube 11, and, for application of the present invention, this its exterior is exported by data transmitter 20 pairs of laser tube power control system 100 and sends command signal (Burst signal), control this laser tube and send this real output signal, wherein, when Burst signal is enabled state (such as logical one), laser tube 11 sends real output signal IPIN, when Burst signal is disable state, laser tube 11 stops sending this real output signal IPIN.With reference to Fig. 5, show the transmission timing figure of Burst signal, when Burst is high level (logical one), laser tube 11 sends data (IPIN signal) by laser detector 12, when Burst is low level (logical zero), laser tube 11 stops sending data (IPIN signal).
In laser tube assembly 10, laser tube 11 is when producing laser emission, part laser emission is detected by photodiode 11, photodiode 11 produces real output signal IPIN, in the present embodiment, this real output signal is a current signal, this current signal is transported in power control system 100 of the present invention as feedback signal, power control system 100 is according to this feedback signal, output feedback ontrol signal Id, laser tube 11 responds this Id signal, produces the expection radiation after adjustment, namely exports the target power value of expectation.
As previously discussed, during laser tube 11 power output, output and " low level " signal (logical zero) of comprising " high level " signal (logical one) export, and when the Id signal sent is high level signal, laser tube 11 exports high level power; Correspondingly, when the Id signal sent is low level signal, laser tube 11 output low level power.Below also will describe in detail, Id signal can produce according to the adjustment electric current produced by this system, and this adjustment electric current, after overdrive circuit (such as, drive circuit can amplify this regulating circuit), exports the Id signal for being characterized by current signal.Similarly to the prior art, this adjustment electric current corresponds to high level output and the low level output of above-mentioned laser tube 11, comprises modulated current (I
mod) and bias current (I
bias).And a main purpose of the present invention, be how FEEDBACK CONTROL is carried out to this adjustment electric current (modulated current and bias current), so that the power output of laser tube 11 is adjusted in target zone.
In addition, data transmitter 20 is as the external module of this system, and it sends for control data, i.e. the power stage of laser tube 11.In real world applications, laser tube 11 is not for carry out data transmission (i.e. power stage) consistently, in GPON/EPON consensus standard such as in current FTTH (fiber entering household), may need to carry out different data conveyings, namely after one group of data is sent, produce a data slot (namely going up the time slot between one group of data and next group data transmission), and then carry out the transmission of another group data.To the control of data conveying, realized by data transmitter 20.
With further reference to Fig. 3, in power control system 100 of the present invention, comprise comparison circuit 110, regulating circuit 120 and clock control circuit 130.
Particularly, comparison circuit 110 produces a binary comparison signal based on real output signal IPIN and echo signal value; Regulating circuit 120 comprises a current occuring circuit 121 and a drive circuit 122, current occuring circuit 121 for produce according to this binary comparison signal one regulate electric current, drive circuit 122 for according to this adjustment electric current output feedback ontrol signal Id to this laser tube 11; Clock control circuit 130 for generation of clock signal, and regulates this adjustment electric current according to clock signal.
Especially, in power control system 100 of the present invention, clock signal comprises the first clock signal and second clock signal, when sending command signal (Burst) from enabled state to disable state-transition, this first clock signal changes, and this binary comparison signal is latched, and, in the disable status slot sending command signal (Burst), this second clock signal changes, and makes regulating circuit 120 carry out Current adjustment according to the comparison signal of this latch.
With reference to Fig. 4, it is the composition schematic diagram of an execution mode of power control system 100 of the present invention.In this embodiment, modulated current control section and bias current control section all adopt power control system of the present invention, namely modulated current control section adopts 100a, bias current control section adopts 100b, thus, two power control section divide 100a, 100b to form a power control system of double-closed-loop laser tube for laser tube.Easy understand, in modulated current control section 100a, the echo signal value for comparing with real output signal IPIN is correspond to the target current value P that this laser tube exports high level power level
avg target; Accordingly, in bias current control section 100b, the echo signal set for comparing in real output signal IPIN corresponds to the target current value P of this laser tube output low level power level
0 target.
Particularly, with reference to Fig. 4, divide in 100a in the power control section controlled for modulated current, comparison circuit 110a comprises comparator 111a, the inverting input of this comparator 111a is connected with current/voltage converter (I/V) 112a and analog to digital converter (DAC) 113a, target current value P in turn
avg targetbe delivered to analog to digital converter 113a, the normal phase input end of comparator 111a is connected with current/voltage converter (I/V) 114a, and real output signal IPIN is delivered to this current/voltage converter 114a.In the illustrated embodiment, IPIN is a current signal, and it is converted to an average voltage level V by current/voltage converter 114a
pavg(with reference to Fig. 6, namely averaging to the data of all transmission in a Burst), the comparison signal as IPIN is transported to the normal phase input end of comparator 111a, target current value P
avg targetcarry out Analog-digital Converter through analog to digital converter 110a, and then be converted into voltage signal V by current/voltage converter 112a
atar, and being transported to the inverting input of comparator 111a, comparator 111a is to average voltage level V
pavgwith voltage signal V
atarcompare, and export comparative result R
avg, in arranging preferably, as average voltage level V
pavgbe greater than voltage signal V
atartime, comparator 111a outputs signal R
avgfor high level (logical one), this represents that the high level luminous power that laser tube 11 exports is less than preset value, otherwise, as average voltage level V
pavgbe less than voltage signal V
atartime, comparator 111a outputs signal R
avgfor low level (logical zero), this represents that the high level luminous power that laser tube 11 exports is greater than preset value.Also will describe in detail below, regulating circuit afterwards and clock circuit will according to the output signal R of comparator 111a
avg, modulated current is regulated.
For in the control section 100b of bias current, setting and the 110a of comparison circuit 110b are similar, normal phase input end unlike the amplifier 111b of this comparison circuit 110b adds a high-level detection 115b, particularly, comparison circuit 110b comprises a comparator 111b, the inverting input of comparator 111b is connected with current/voltage converter (I/V) 112b and analog to digital converter (DAC) 113b in turn, and target current value P
0 targetbe delivered to this analog to digital converter 113b, the normal phase input end of comparator 111b is connected with high-level detection (THD) 115b and current/voltage converter (I/V) 114b in turn, and real output signal IPIN is delivered to this current/voltage converter 114b.High-level detection 115b can adopt conventional peak detection circuit to form.Easy understand, on optimum configurations, the gain of two current/voltage converters 112b, 114b should be identical.Target current value P
0 targetcarry out digital-to-analogue conversion through digital to analog converter 113b and convert voltage signal V to through current/voltage converter 112b
p0tarafter, be transported to the inverting input of comparator 111b, on the other hand, real output signal IPIN is after the current/voltage-converted of 114b, by high-level detection 115b, real output signal IPIN corresponding during laser tube 11 high level is detected (specifically seeing the following temporal specification to Fig. 6) again, and export comparison signal V
p0be conveyed into the normal phase input end of comparator 111b.Comparator 111b, according to the comparative result of two signals, exports high level or low level output signal R
p0.Similar with the output principle of comparator 111a, work as V
p0be greater than V
p0tartime, comparator 111b outputs signal R
p0for high level (logical one), this represents that the low level luminous power that laser tube 11 exports is less than preset value, otherwise, work as V
p0be less than V
p0tartime, comparator 111b outputs signal R
p0for low level (logical zero), this represents that the low level luminous power that laser tube 11 exports is greater than preset value.Afterwards, follow-up regulating circuit and clock circuit will according to the output signal R of comparator 111b
p0, regulate bias current, this will hereafter more describe in detail.
In above-mentioned comparison circuit 110a and 110b, the comparison signal being input to comparator 111a, 111b two inputs is voltage signal.Easy understand, also can adopt the mode of current signal, and two inputs real output signal and echo signal being applied to comparator compare.
Further, regulating circuit in control section 100a and control section 100b comprises current occuring circuit 121a, 121b and drive circuit 122a, 122b respectively, more specifically, current occuring circuit 121a, 121b comprises counter 1211a, 1211b and digital to analog converter 1212a, 1212b respectively.Counter 1211a, 1211b under the control of respective clock control circuit, respectively to binary comparison signal R
avgand R
p0count, then result is outputted to digital to analog converter 1212a, 1212b, carry out digital-to-analogue conversion, produce modulated current signal I respectively
modwith bias current signal I
bias, modulated current signal I
modwith bias current signal I
biasafter carrying out a certain proportion of amplification respectively by drive circuit 122a, 122b, generate feedback control signal Id and output to laser tube 11.Drive circuit 122a, 122b are respectively modulated current driver and bias current driver, and they can discretely be arranged, and also accessible site is in same laser tube driver.
Alternately, current occuring circuit 121a, 121b also can adopt other set-up modes to produce modulated current signal and bias current signal.Such as, current occuring circuit 121a, 121b can be analog circuits, and binary comparison signal exports R
avgand R
p0can loop filter be passed through, draw analog signal output and produce modulated current and bias current after passing ratio conversion.
As mentioned above, current occuring circuit 121a, 121b is the adjustment carrying out two kinds of electric currents under the control of clock control circuit.Particularly, in control section 100a, 100b, clock control circuit comprises clock controller 131a, 131b for generation of clock signal and d type flip flop 132a, 132b respectively, clock controller 131a, 131b produce the first clock signal clk1 and second clock signal clk2, d type flip flop 132a, 132b according to the transformation of this first clock signal clk1, to binary comparison signal R
avgand R
p0latch.On the other hand, counter 1211a, 1211b according to the transformation of second clock signal clk2, to R
avgand R
p0carry out counting behaviour and Current adjustment.In the present embodiment, clock controller 131a, 131b can be two independently unit, also can be the clock control cells that two control sections 100a, 100b share.
With reference to Fig. 4, clock controller produces the first clock signal clk1 and second clock signal clk2 according to transmission command signal (Burst), and, when Burst signal changes from enabled state (Burston) to disable state (Burst off), the trailing edge of the transmission command signal namely shown in Fig. 4 clock, first clock signal clk1 changes (T1 moment), now by d type flip flop 132a, 132b latch signal R
avgand R
p0after this disable status slot of transmission command signal is entered (namely during this period of time, laser 11 does not carry out data transmission), and, utilize clock controller 131a, 131b, in this time slot, make second clock signal clk2 change (T2 moment), thus make counter 1211a, 1211b start to latch binary signal R
avgand R
p0count, in this embodiment, counter 1211a, 1211b are bidirectional counter, namely the result latched according to d type flip flop 132a, 132b carries out adding 1 or subtract 1 computing, when the output of d type flip flop 132a, 132b is high level (logical one), counter 1211a, 1211b add 1, otherwise then subtract 1.In a time slot, (do not comprise two moment of Burst signal reversion), second clock signal clk1 only changes once, and namely time slot counter 1211a, a 1211b only complete a plus and minus calculation.For modulated current control section 100a, if Counter Value increases, then the output current (i.e. modulated current Imod) of corresponding digital to analog converter 1212a increases, and is delivered to laser tube 11 after amplifying certain proportion by drive circuit 122a.If now suppose that bias current is constant, then the average light power of laser tube 11 also can increase, and the increase of average light power can cause V
pavgreduce, thus, Vpavg can be made to approach Vatar gradually, thus finally make export power and predetermined power consistent, realize the control to power output.The principle of bias current control section 100b and modulated current control section 100a is similar.
Composition graphs 4, in this embodiment, when instruction transmission signal Burst gets back to enabled state from disable state, first clock signal clk1 and second clock signal clk2 also changes, and (the first clock signal ckl1 is low level from high level upset, second clock signal clk2 is high level from low level upset), thus complete this adjustment operation, and enter next cycle period.In addition, easy understand, second clock signal clk2, in the conversion in T2 moment, should carry out after trigger completes latch, and namely the time difference of T1 and T2 should meet the latch operation of trigger.
For modulated current control section 100a, current/voltage converter 112a, 114a can adopt low speed devices, and for bias current control section 100b, current/voltage converter 114b need adopt high speed device, and current/voltage converter 112b adopts common low speed devices.This is because at modulated current control section 100a, real output signal IPIN is converted into average voltage level by the current/voltage converter 114a by low speed, does not therefore need high speed processing in transfer process.And for bias current control section 100b, due to need by the output signal IPIN corresponding when low-level of power of high-level detection 115b detection laser pipe 11, current/voltage converter 114b need complete the current/voltage-converted to IPIN signal at high speed, because it need adopt high speed device.Particularly, as shown in Figure 6, for IPIN signal is through the waveform transformation figure of current/voltage converter 114b and high-level detection 115b, wherein, real output signal IPIN is that the electric current of photodiode 12 exports, wherein high impulse is corresponding to the testing circuit of (i.e. output logic " 1 ") under high level state, and low pulse is corresponding to (the i.e. detection electric current of output logic " 0 " under low level state.IPIN signal is output voltage signal Vipin after current/voltage-converted, and due to the dipole inversion of current/voltage converter circuit, now high impulse corresponds to the transmitted power of low level state, and low pulse corresponds to the transmitted power of high level state.Voltage signal Vipin is output voltage signal Vp0 after high-level detection 115b again.When sending the disable state of command signal (Burst off stage), this output is pre-set into a scheduled voltage Vpo_reset.When sending the enabled state of command signal and starting (Burst start), high-level detection 115b starts working, and after one section of stabilization time Tset, circuit exports the high value equaling Vipin, thus realizes high level measuring ability.After the transmission of this secondary data terminates, Vpo is reset to Vpo_reset again, to adapt to the quick foundation during different data send in (during Burst), meets specific protocol (as PON agreement etc.) demand.
In the above-described embodiment, adopt two close cycles power control mode, namely bias current control and modulated current control section all adopt feedback control scheme of the present invention.Alternately, also can only bias current control and modulation control loop in one adopt this feedback control scheme, and the another kind of opened loop control scheme that adopts, such as, " modulation circuit open loop biasing circuit closed loop " pattern can be adopted, also can adopt " biasing circuit open-loop modulation circuit closed loop " pattern.For opened loop control, as previously mentioned, the open-loop control method that look-up table etc. is commonly used can be adopted.
Laser tube power control system of the present invention, is particularly suitable for the communication network such as GPON/EPON based on burst (BURST) pattern.During data send, (BURST ON) completes and compares the detection of laser tube power output, but power output is not regulated, and in the gap (BURST OFF) sending data, modulated current and biasing circuit are regulated according to the testing result of previous transmission Frame (data namely sent during a BURST ON), thus avoids modulation loop on the impact of main data channel.
Compared with existing power control system, the present invention regulates according to each transmission data, but regulate according to each data slot, this regulative mode meets the gradual feature of the aging and variations in temperature of laser tube, avoid the use of high-speed comparator, high-frequency clock generative circuit simultaneously, greatly reduce design difficulty and the circuit power consumption of circuit thus.
In addition, in control system of the present invention, have employed bidirectional counter to preserve adjustment result, which avoid and adopt electric capacity to store easily electric leakage and the precision disappearance that causes, thus substantially increase the control precision of circuit, and be applicable to the application of long BURST OFF.Further, modulated current control loop and bias current control all can select control system of the present invention, independently work, thus facilitate the combination of different control model.
Claims (11)
1. a laser tube power control system, for controlling the power output of laser tube, wherein, this laser tube produces real output signal to this laser tube power control system, this laser tube power control system output feedback ontrol signal is to laser tube, thus FEEDBACK CONTROL is carried out to the power of this laser tube, and, by data transmitter, transmission command signal is exported to this laser tube power control system, control this laser tube and send this real output signal, wherein, when this transmission command signal is enabled state, this laser tube sends this real output signal, when this transmission command signal is disable state, this laser tube stops sending this real output signal, it is characterized in that, this laser tube control system comprises:
Comparison circuit, this comparison circuit comprises the comparison circuit for modulated current and the comparison circuit for bias current, this comparison circuit produces a binary comparison signal based on this real output signal and echo signal value, the described comparison circuit for modulated current and the comparison circuit for bias current include a comparator, the inverting input of this comparator is connected with first current/voltage converter and the first analog to digital converter in turn, and target current value is delivered to this first analog to digital converter, the normal phase input end of this comparator is connected with second current/voltage converter, and described real output signal is delivered to this second current/voltage converter,
Regulating circuit, this regulating circuit comprises the regulating circuit producing modulated current and the regulating circuit producing bias current, the regulating circuit of described generation modulated current and the regulating circuit of generation bias current include a current occuring circuit and a drive circuit, described current occuring circuit comprises a counter and a digital to analog converter, regulate electric current for producing one according to this binary comparison signal, this drive circuit is used for exporting this feedback control signal to this laser tube according to this adjustment electric current;
Clock control circuit, for generation of clock signal, and regulates this adjustment electric current according to clock signal;
Wherein, this clock signal comprises the first clock signal and second clock signal, when this transmission command signal is from enabled state to disable state-transition, this first clock signal changes, and this binary comparison signal is latched, and, in the disable status slot of this transmission command signal, this second clock signal changes, and makes this regulating circuit carry out Current adjustment according to the comparison signal of this latch.
2. laser tube power control system according to claim 1, is characterized in that, described adjustment electric current is modulated current, and described echo signal value is correspond to the target current value that this laser tube exports high level power level.
3. laser tube power control system according to claim 1, is characterized in that, described adjustment electric current is bias current, and described echo signal value is the target current value corresponding to this laser tube output low level power level.
4. laser tube power control system according to claim 1, it is characterized in that, described comparison circuit comprises a comparator, the inverting input of this comparator is connected with first current/voltage converter and the first analog to digital converter in turn, and described target current value is delivered to this first analog to digital converter, the normal phase input end of this comparator is connected with a high-level detection and the second current/voltage converter in turn, and described real output signal is delivered to this second current/voltage converter.
5. laser tube power control system according to claim 1, it is characterized in that, described clock control circuit comprises a clock controller for generation of clock signal and a d type flip flop, this clock controller produces described first clock signal and second clock signal, and this d type flip flop latches described binary comparison signal according to the transformation of described first clock signal.
6. laser tube power control system according to claim 1 or 5, it is characterized in that, described current occuring circuit comprises a counter and a digital to analog converter, when described second clock signal changes in described disable status slot, this counter carries out computing according to binary comparison signal of described latch, and this digital to analog converter exports described adjustment electric current according to the value of this counter.
7. laser tube power control system according to claim 1, is characterized in that, described first current/voltage converter and described second current/voltage converter are low speed devices.
8. laser tube power control system according to claim 1, is characterized in that, described comparator is low speed devices.
9. laser tube power control system according to claim 4, is characterized in that, described first current/voltage converter is low speed devices, and described second current/voltage converter is high speed device.
10. laser tube power control system according to claim 4, is characterized in that, described comparator is low speed devices.
11. laser tube power control system according to claim 6, is characterized in that, described counter is bidirectional counter.
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| CN103915755B (en) * | 2014-02-28 | 2017-02-15 | 嘉兴禾润电子科技有限公司 | Automatic laser average optical power control system for burst mode |
| CN103904542B (en) * | 2014-03-11 | 2016-08-17 | 厦门优迅高速芯片有限公司 | A kind of laser driver double-closed-loop control method that can be used for burst mode |
| CN104320194A (en) * | 2014-09-30 | 2015-01-28 | 东南大学 | Parallel optical interconnection realization apparatus |
| CN104579458A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Light power compensation method and circuit |
| DE102016212929B4 (en) | 2016-07-14 | 2020-12-24 | Trumpf Laser Gmbh | Laser pulse generator and method for generating a laser pulse |
| CN110911955B (en) * | 2019-12-09 | 2021-07-30 | 深圳市杰普特光电股份有限公司 | Laser power monitoring system and control method |
| CN217405911U (en) * | 2021-12-10 | 2022-09-09 | 山东大学 | Parameter-adjustable pulse laser light source |
| CN117293641B (en) * | 2023-11-27 | 2024-03-01 | 深圳市通甪科技有限公司 | Laser energy feedback circuit, laser energy feedback device and laser ablation instrument |
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| US6188498B1 (en) * | 1998-07-15 | 2001-02-13 | Maxim Integrated Products, Inc. | Local control for burst mode optical transmitters |
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