CN103441423B - Narrow-linewidth tunable laser system and operation method - Google Patents
Narrow-linewidth tunable laser system and operation method Download PDFInfo
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- CN103441423B CN103441423B CN201310395264.7A CN201310395264A CN103441423B CN 103441423 B CN103441423 B CN 103441423B CN 201310395264 A CN201310395264 A CN 201310395264A CN 103441423 B CN103441423 B CN 103441423B
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Abstract
The present invention is narrow-linewidth tunable laser system and operation method, the tunable laser module of system contains semiconductor laser and the drive circuit be attached thereto and Wavelength tunable and controls submodule, and it is system power supply that positive voltage is converted to negative voltage by the switching regulator connecing inductance and diode of power management submodule.The microcontroller be connected with main frame is connected with drive circuit through digital-to-analogue conversion, transmits host command and laser status.Microcontroller and detection of power loss submodule timing detection laser circuit voltage, find that power down recovers in time.Its operation method is: after initialization, microcontroller sends preset default data frame to laser, read laser return data frame, determine errorless, timing detects with or without power down, Receiving Host upgrades instruction and sends to laser, sends work state information current for laser to main frame.Native system only needs single power supply, is easy to embed use; The tuning control inerface simple, intuitive of main frame, power down self-inspection is guaranteed reliable.
Description
Technical field
The present invention relates to semiconductor laser field, be specially a kind of narrow-linewidth tunable laser system and operation method.
Background technology
Tunable laser is a kind of important light source device, provides the fields such as platform, interconnection and optical switch all to need to use tunable laser in wavelength-division multiplex system, local oscillator, reconfigurable optical bifurcated multiplexed network, interferometer measuration system, packet technology, multi-service.
Tunable laser has that cost is low, volume is little, lightweight, electro-optical efficiency is high, control the features such as simple, and wavelength, power and channel spacing are adjustable, therefore obtain applying more and more widely.The multiplex external-cavity semiconductor laser of tunable laser realizes, within the scope of wavelengthtunable, use hot tunable etalon filter to realize the long single mode of operation of selected standing wave, inner wavelength locker ensure that the stability of wavelength, directly can enable lambda switch rapidly by control circuit, thus reach tuning object.Integrated semiconductor optical amplifier has been used for the control to luminous power, and wavelength locker is by realizing the monitoring of forward direction power output and stable to the FEEDBACK CONTROL of semiconductor optical amplifier.
Research shows, the inefficacy about 50% of current semiconductor laser is due to driving problems, and about 25% is laser self reason, and other 25% is that incorrect use causes.Therefore seem particularly important in the peripheral additional driver circuit of laser.The performance of drive circuit directly has influence on the life-span of electro-optical efficiency, laser output stability and laser, also needs to add peripheral control circuit for tunable laser.For the ease of producing and installing, tunable laser and additional all drive circuits, control circuit are pre-installed on special circuit board, form a tunable laser module.
There are three main technical problems in current integrated tunable laser module: 1, need positive and negative two groups of Power supplies, tunable laser needs the negative voltage of one group of big current to power.Being embedded in the middle of other system to allow tunable laser module be easy to, have developed by the tunable laser module of single power supply.Single supply adopts polarity inversion topological structure to complete the conversion that positive electricity is pressed onto negative voltage, because polarity inversion topological structure has a Right-half-plant zero in its control to Output transfer function, and therefore this topological structure existence and stability problem.2, control complicated, use the related development personnel of tunable laser module or engineering staff etc. to need to be familiar with very much OIF(optical interconnection forum, the abbreviation of OpticalInternetworkingForum) multi-source agreement.3, have the occasion of particular/special requirement (as there is the occasion of other strong electromagnetic) tunable laser to there will be the faults such as power down at some, these application scenarios, owing to often relating to the defence safety of country, more need the working stability of tunable laser module reliable.
Therefore the tuneable laser system that exploitation one overcomes the problems referred to above is needed at present badly.
Summary of the invention
The object of the invention is to design a kind of narrow-linewidth tunable laser system, is furnished with power management submodule, this module breaker in middle pressurizer realizes the conversion that positive electricity is pressed onto negative voltage, and this tunable laser module uses common single power supply, is easy to embed application system and installs and uses.
Another object of the present invention designs the operation method of above-mentioned narrow-linewidth tunable laser system.
The narrow-linewidth tunable laser system of design of the present invention, include tunable laser module, tunable laser module contain semiconductor laser with install on circuit boards, the drive circuit submodule that is connected with laser and Wavelength tunable control submodule, also comprise power management submodule, the critical piece of power management submodule is switching regulator, the input of positive voltage access switching regulator, the output termination inductance of switching regulator and diode, realize input positive voltage and be reversed to negative voltage, export negative voltage.Input and the output of switching regulator are also connected to input and output capacitors respectively, as building-out capacitor to provide larger phase margin.
This narrow-linewidth tunable laser system is connected with main frame, and microcontroller is connected with drive circuit submodule through digital-to-analogue conversion submodule, and microcontroller is connected with main frame through four line digital interfaces.The control information of main frame sends into drive circuit submodule through microcontroller, digital-to-analogue conversion submodule, and control the wavelength tuning of laser, the operating state of laser also sends main frame to through microcontroller.Main frame can be placed in far-end.
This narrow-linewidth tunable laser system is also furnished with detection of power loss submodule, this submodule comprises precision instrument amplifier and analog to digital converter, detection resistance in precision instrument amplifier and laser circuit is in parallel, and precision instrument amplifier is connected with microcontroller through analog to digital converter.The magnitude of voltage of precision instrument amplifier acquisition testing resistance also amplifies, and through analog to digital converter, analog voltage signal is converted to digital voltage signal.Microcontroller is by the clock control timing detectable voltage signals in it, lower than the magnitude of voltage that its laser stored normally works, then be judged as power down, microcontroller sends instruction to laser, laser is sent into through digital-to-analogue conversion submodule and drive circuit submodule, make it to recover normal work, avoid laser power down to quit work, ensure that its working stability is reliable.
This narrow-linewidth tunable laser system is also furnished with protective circuit submodule; it is connected with laser; comprise time-delay soft start protective circuit, current-limiting protection circuit and power-on shock protection circuit three parts; prevent the overdriving of drive circuit submodule, avoid semiconductor laser to be subject to surge, protection laser safety starts and reliably working.
The step of the operation method of narrow-linewidth tunable laser system of the present invention is as follows:
I, start
Power management submodule is energized, and powers to tunable laser module and microcontroller, microcontroller initialization;
II, default data frame
Microcontroller sends one group of default data frame to laser, comprises the power of the output light of laser, wavelength and channel spacing, and this default data frame needs to pre-set according to user;
III, reading return data frame
Laser receives default data frame, runs by this, sends return data frame to microcontroller simultaneously; Microcontroller receives return data frame acknowledgment laser and runs errorless, sends work state information current for laser to main frame; Otherwise return Step II, microcontroller sends default data frame to laser again;
IV, laser detection of power loss
Microcontroller, by the detectable voltage signals of the clock control timing acquiring detection of power loss submodule in it, when voltage detecting is normal, continues timing and detects; And work as the magnitude of voltage detecting voltage and normally work lower than the laser that it stores, be then judged as power down, return Step II, microcontroller sends default data frame to laser again; Timing sense cycle sets at microcontroller;
V, host computer control instruction
When needing wavelength, luminous power, the channel spacing upgrading laser, administrative staff send from the control inerface of main frame to microcontroller interrupts current operation request and changes data one or more wavelength, luminous power, channel spacing;
VI, send more new data frame
Microcontroller Receiving Host control command, and perform interrupt requests immediately, dataframe will be upgraded to laser;
The return data frame of VII, reading update data frame
Laser receives more new data frame, runs in new state by this, sends return data frame to microcontroller simultaneously; Microcontroller receives return data frame acknowledgment laser by more new state operation is errorless, sends work state information current for laser to main frame; Otherwise return step VI, microcontroller sends more new data frame to laser again;
VIII, continuation laser detection of power loss
Microcontroller, by the detectable voltage signals of the clock control timing acquiring detection of power loss submodule in it, when voltage detecting is normal, continues timing and detects; Otherwise return step VI, microcontroller sends more new data frame to laser again.
Compared with prior art, the advantage of narrow-linewidth tunable laser system of the present invention and operation method is: 1, power management submodule achieves the conversion that positive electricity is pressed onto negative voltage, the tunable laser module of native system only needs the single power supply of 9 ~ 20V, laser module to be easier to be embedded in the middle of other system; 2, achieve the tunable of laser module by main frame, the software control interface simple, intuitive of main frame, do not need developer or engineering staff to go to understand concrete communication protocol and just can complete the tuning of laser module luminous power, wavelength and channel spacing; 3, detection of power loss submodule and the microcontroller implementation self-inspection of laser module, solves the power-off problems of laser, does not interrupt, enhance robustness and the practicality of tunable laser to guarantee that special occasions laser runs; 4, protective circuit guarantees the safety of laser start-up and operation.
Accompanying drawing explanation
The structured flowchart of this narrow-linewidth tunable laser system of Fig. 1 embodiment;
The structured flowchart of power management submodule in Fig. 2 Fig. 1;
The flow chart of the operation method embodiment microcontroller of this narrow-linewidth tunable laser system of Fig. 3.
Embodiment
Below in conjunction with the accompanying drawing of embodiment, the present invention is further described.
Narrow-linewidth tunable laser system embodiment
The structured flowchart of this narrow-linewidth tunable laser system embodiment is shown in Fig. 1.Tunable laser module contain semiconductor laser with install on circuit boards, the drive circuit submodule that is connected with laser, Wavelength tunable control submodule, detection of power loss submodule and protective circuit.The semiconductor laser of this example is 26 pin butterfly refrigeration external-cavity semiconductor laser.Microcontroller is connected with digital-to-analogue conversion submodule by serial peripheral equipment interface SPI (SerialPeripheralInterface), and the output of digital-to-analogue conversion submodule connects drive circuit submodule.
This example adopts STC15L2K60S2 microcontroller, and its inside is integrated with high accuracy R/C clock, and under normal temperature, temperature is waftd is 5 ‰, and separately need not add external crystal-controlled oscillation, operating voltage is 2.4 ~ 3.6V, shares the power supply of laser module, without the need to extra power supply.This routine microcontroller is connected with the main frame being placed in far-end through four line digital interface RS422.Two groups of High-speed Asynchronous Secial Communication ports, the order of Receiving Host transmission simultaneously and return laser light device module status information.
Drive circuit submodule comprises and is supplied to the high stability of laser, the constant-current source of low-ripple coefficient and thermoelectric refrigerating unit (TEC) control circuit, by microprocessor controls.
Power management submodule provides power supply for laser module and microcontroller, the structured flowchart of power management submodule as shown in Figure 2, positive voltage V
inthe input of access switching regulator, the output termination inductance L of switching regulator and diode D, input and the output of switching regulator are also connected to input capacitance C respectively
inwith output capacitance C
out, as building-out capacitor, export negative voltage V
out.Because laser module needs the electric current of 1.5A when starting, under high load currents condition, cabling and assembly layout most important, otherwise large switching current will cause circuit malfunctions.The printed circuit plate portion of the installation power management submodule of this example without covering copper face, input capacitance C
inbe less than 3mm with the distance of switching regulator input pin, between the two, wire length is 0.8mm ~ 1.2mm, output capacitance C
outcabling and the distance of switching regulator be more than or equal to 10mm, avoid large switching current to cause circuit malfunctions.Output current is more than or equal to the linear voltage regulator of 1.5A as power management submodule positive voltage source.
Described detection of power loss submodule comprises precision instrument amplifier AD8221 and analog to digital converter, and the detection resistance in precision instrument amplifier and laser circuit is in parallel, and precision instrument amplifier is connected with microcontroller through analog to digital converter.In order to avoid the noise in precision instrument amplifier AD8221 power pins can make its penalty, make it to obtain the power supply of galvanic current pressure, its power pins adds shunt capacitance with decoupling.
This example adopts single supply system, and the input range of instrument amplifier is in the voltage range of instrument amplifier power supply, and namely between its positive supply and earth potential, instrument amplifier output voltage difference is less than its supply voltage.
Described protective circuit submodule comprises time-delay soft start protective circuit, current-limiting protection circuit and power-on shock protection circuit three parts.
The operation method embodiment of narrow-linewidth tunable laser system
This example is the operation method of above-mentioned narrow-linewidth tunable laser system embodiment, and the flow chart that microcontroller runs as shown in Figure 3, comprises the steps:
I, start
Power management submodule is energized, and powers to tunable laser module and microcontroller, microcontroller initialization;
II, default data frame
Microcontroller sends one group of default data frame to laser, comprises the power of the output light of laser, wavelength and channel spacing, and this default data frame needs to pre-set according to user, namely arranges the operating state of laser acquiescence; This routine default data frame is the Output optical power of laser is 15.5dBm, and channel spacing is 50GHz, and wavelength is 1550.12nm.
III, reading return data frame
Laser receives default data frame, runs by this, sends return data frame to microcontroller simultaneously; Microcontroller receives return data frame acknowledgment laser and runs errorless; Otherwise return Step II, microcontroller sends default data frame to laser again;
IV, laser detection of power loss
Microcontroller, by the detectable voltage signals of the clock control timing acquiring detection of power loss submodule in it, when voltage detecting is normal, continues timing and detects; Otherwise return Step II, microcontroller sends default data frame to laser again; Timing sense cycle sets at microcontroller, and this example is set to 100 milliseconds of ms;
V, host computer control instruction
When needing wavelength, luminous power, the channel spacing upgrading laser, administrative staff send from the control inerface of main frame to microcontroller interrupts current operation request and changes data one or more wavelength, luminous power, channel spacing;
In adjustable extent, the upper and lower any adjustment of wavelength can be completed by channel spacing by the control system interface of main frame, in adjustable extent, also directly can input any adjustment that required wavelength value realizes wavelength.This example is 1528.38nm ~ 1563.45nm based on the Wavelength tunable scope of ITU channel spacing.This example arranges 10,14,15.5dBm tri-kinds of Output optical power working points.The multiple ITU channel spacing such as 50GHz, 100GHz or 200GHz can be selected in centre wavelength interval;
VI, send more new data frame
Microcontroller Receiving Host control command, and perform interrupt requests immediately, dataframe will be upgraded to laser;
The return data frame of VII, reading update data frame
Laser receives more new data frame, runs in new state by this, sends return data frame to microcontroller simultaneously; Microcontroller receives return data frame acknowledgment laser by more new state operation is errorless; Otherwise return step VI, microcontroller sends more new data frame to laser again;
VIII, continuation laser detection of power loss
Microcontroller, by the detectable voltage signals of the clock control timing acquiring detection of power loss submodule in it, when voltage detecting is normal, continues timing and detects; Otherwise return step VI, microcontroller sends more new data frame to laser again.
Above-described embodiment, be only the specific case further described object of the present invention, technical scheme and beneficial effect, the present invention is not defined in this.All make within scope of disclosure of the present invention any amendment, equivalent replacement, improvement etc., be all included within protection scope of the present invention.
Claims (4)
1. the operation method of narrow-linewidth tunable laser system, described narrow-linewidth tunable laser system includes tunable laser module, tunable laser module contain semiconductor laser with install on circuit boards, the drive circuit submodule that is connected with laser and Wavelength tunable control submodule
Also comprise power management submodule, the critical piece of power management submodule is switching regulator, the input of positive voltage access switching regulator, and the output termination inductance of switching regulator and diode, export negative voltage;
Input and the output of described switching regulator are also connected to input and output capacitors respectively;
Install the printed circuit plate portion of described power management submodule without covering copper face, the distance of described input capacitance and switching regulator input pin is less than 3mm, and between the two, wire length is 0.8mm ~ 1.2mm; Output capacitance C
outcabling and the distance of switching regulator be more than or equal to 10mm;
Output current is more than or equal to the linear voltage regulator of 1.5A as power management submodule positive voltage source;
Microcontroller is connected with drive circuit submodule through digital-to-analogue conversion submodule, and microcontroller is connected with main frame through four line digital interfaces;
Also be furnished with detection of power loss submodule, this detection of power loss submodule comprises precision instrument amplifier and analog to digital converter, and the detection resistance in precision instrument amplifier and laser circuit is in parallel, and precision instrument amplifier is connected with microcontroller through analog to digital converter;
The feature of described narrow-linewidth tunable laser system operation method is that step is as follows:
I, start
Power management submodule is energized, and powers to tunable laser module and microcontroller, microcontroller initialization;
II, default data frame
Microcontroller sends one group of default data frame to laser, comprises the power of the output light of laser, wavelength and channel spacing, and this default data frame needs to pre-set according to user;
III, return data frame is read
Laser receives default data frame, runs by this, sends return data frame to microcontroller simultaneously; Microcontroller receives return data frame acknowledgment laser and runs errorless, sends work state information current for laser to main frame; Otherwise return step II, microcontroller sends default data frame to laser again;
IV, laser detection of power loss
Microcontroller, by the detectable voltage signals of the clock control timing acquiring detection of power loss submodule in it, when voltage detecting is normal, continues timing and detects; And work as the magnitude of voltage detecting voltage and normally work lower than the laser that it stores, be then judged as power down, return step II, microcontroller sends default data frame to laser again; Timing sense cycle sets at microcontroller;
V, host computer control instruction
When needing wavelength, luminous power, the channel spacing upgrading laser, administrative staff send from the control inerface of main frame to microcontroller interrupts current operation request and changes data one or more wavelength, luminous power, channel spacing;
VI, more new data frame is sent
Microcontroller Receiving Host control command, and perform interrupt requests immediately, dataframe will be upgraded to laser;
VII, the return data frame of reading update data frame
Laser receives more new data frame, runs in new state by this, sends return data frame to microcontroller simultaneously; Microcontroller receives return data frame acknowledgment laser by more new state operation is errorless, sends work state information current for laser to main frame; Otherwise return step VI, microcontroller sends more new data frame to laser again;
VIII, laser detection of power loss is continued
Microcontroller, by the detectable voltage signals of the clock control timing acquiring detection of power loss submodule in it, when voltage detecting is normal, continues timing and detects; Otherwise return step VI, microcontroller sends more new data frame to laser again.
2. the operation method of narrow-linewidth tunable laser system according to claim 1, is characterized in that:
The power pins of described precision instrument amplifier adds shunt capacitance.
3. the operation method of narrow-linewidth tunable laser system according to claim 1, is characterized in that:
The input range of described instrument amplifier is in its power supply voltage range, and its output voltage difference is less than its supply voltage scope.
4. the operation method of narrow-linewidth tunable laser system according to claim 1, is characterized in that:
Also be furnished with protective circuit submodule, it is connected with laser, comprises time-delay soft start protective circuit, current-limiting protection circuit and power-on shock protection circuit three parts.
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| CN108390728B (en) * | 2018-02-24 | 2020-03-06 | 青岛海信宽带多媒体技术有限公司 | Optical module power-on control method and device |
| CN112198746B (en) * | 2019-07-08 | 2022-04-19 | 深圳市Tcl高新技术开发有限公司 | Laser light source drive circuit and system |
| CN114552378B (en) | 2020-11-20 | 2023-03-31 | 中国科学院苏州纳米技术与纳米仿生研究所 | Narrow linewidth laser |
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