CN103441423A - Narrow-linewidth tunable laser system and operation method thereof - Google Patents
Narrow-linewidth tunable laser system and operation method thereof Download PDFInfo
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Abstract
The invention provides a narrow-linewidth tunable laser system and an operation method thereof. A tunable laser module of the system comprises a semiconductor laser, a driving circuit and a wavelength-tunable control submodule, wherein the driving circuit and the wavelength-tunable control submodule are connected with the semiconductor laser. A switch voltage stabilizer, connected with an inductor and a diode, of a power management submodule enables positive voltage to be converted into negative voltage so as to supply electricity to the system. A microcontroller connected with a host is connected with the driving circuit through digital-to-analog conversion to transmit instructions of the host and states of the laser. The microcontroller and a power failure detection submodule are used for detecting circuit voltage of the laser at regular time, and power is recovered in time when power failure is found out. The operation method of the narrow-linewidth tunable laser system includes the steps that after being initialized, the microcontroller transmits preset default data frames to the laser, the data frames returned by the laser are read, the situation that the data frames have no error is determined, whether power failure occurs or not is detected at regular time, updated instructions of the host are received and transmitted to the laser, and the current working state information of the laser is transmitted to the host. The system only needs to be powered up by a single power supply and can be used easily in an embedded mode. A tuning control interface of the host is simple and visual, and reliable operation is guaranteed through power failure self-detection.
Description
Technical field
The present invention relates to semiconductor laser field, be specially a kind of narrow linewidth tuneable laser system and operation method.
Background technology
Tunable laser is a kind of important light source device, in wavelength-division multiplex system, local oscillator, reconfigurable optical bifurcated multiplexed network, interferometer measuration system, packet technology, multi-service, provides the fields such as platform, interconnection and optical switch all to need to use tunable laser.
Tunable laser has that cost is low, volume is little, lightweight, electro-optical efficiency is high, control the characteristics such as simple, and wavelength, power and channel spacing are adjustable, therefore obtains applying more and more widely.The multiplex external-cavity semiconductor laser of tunable laser realizes, in the wavelengthtunable scope, realize the single mode operation of selected wavelength with hot tunable etalon filter, inner wavelength locker has guaranteed the stability of wavelength, directly by control circuit, can enable rapidly lambda switch, thereby reach tuning purpose.Integrated semiconductor optical amplifier has been used for to the control of luminous power, and wavelength locker is realized the monitoring of forward direction power output and stablizes by the FEEDBACK CONTROL to semiconductor optical amplifier.
Research shows, the inefficacy of semiconductor laser at present 50% is approximately due to driving problems, and approximately 25% is the 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, for tunable laser, also needs to add peripheral control circuit.For the ease of producing and installing, tunable laser and all drive circuits that add, control circuit pre-installation, on special-purpose 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 to need the negative voltage power supply of one group of large electric current.In order to allow the tunable laser module be easy to be embedded in the middle of other system, developed the tunable laser module by single power supply.Single supply adopts the polarity inversion topological structure to complete the conversion that positive electricity is pressed onto negative voltage, because the polarity inversion topological structure is controlled to having RHP zero point in the Output transfer function at it, so this topological structure existence and stability problem.2, control complicatedly, use the related development personnel of tunable laser module or engineering staff etc. need to be familiar with very much OIF(optical interconnection forum, the abbreviation of Optical Internetworking Forum) multi-source agreement.3, at some, have occasion (as there is the occasion of other strong electromagnetic) tunable laser of specific (special) requirements to there will be the faults such as power down, these application scenarios, owing to often relating to national defence safety, more need the working stability of tunable laser module reliable.
Therefore need at present a tuneable laser system that overcomes the problems referred to above of exploitation badly.
Summary of the invention
The objective of the invention is to design a kind of narrow linewidth tuneable laser system, is furnished with the power management submodule, in this module, switching regulator realizes that positive electricity is pressed onto the conversion of negative voltage, and this tunable laser module is used common single power supply, is easy to embed application system and installs and uses.
Another object of the present invention is the operation method of the above-mentioned narrow linewidth tuneable laser system of design.
The narrow linewidth tuneable laser system of design of the present invention, include the tunable laser module, drive circuit submodule on the tunable laser module contains semiconductor laser and is arranged on circuit board, that be connected with laser and wavelength adjustable control submodule, also comprise the power management submodule, the critical piece of power management submodule is switching regulator, the input of positive voltage access switching regulator, output termination inductance and the diode of switching regulator, realize that the input positive voltage is reversed to negative voltage, the output negative voltage.The input of switching regulator and output also are connected to respectively input and output capacitors, and electric capacity is to provide larger phase margin by way of compensation.
This narrow linewidth tuneable laser system is connected with main frame, and microcontroller is connected with the drive circuit submodule through the digital-to-analogue conversion submodule, and microcontroller is connected with main frame through four line digital interfaces.The control information of main frame is sent into the drive circuit submodule through microcontroller, digital-to-analogue conversion submodule, controls the wavelength tuning of laser, and the operating state of laser also sends main frame to through microcontroller.Main frame can be placed in far-end.
This narrow linewidth tuneable laser system also is furnished with the detection of power loss submodule, this submodule comprises precision instrument amplifier and analog to digital converter, detection resistance on 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 timing of the clock control in it detectable voltage signals, the magnitude of voltage of the laser normal operation of storing lower than it, be judged as power down, microcontroller sends instruction to laser, send into laser through digital-to-analogue conversion submodule and drive circuit submodule, make it to recover normal operation, avoid the laser power down to quit work, guarantee that its working stability is reliable.
This narrow linewidth tuneable laser system also is furnished with the protective circuit submodule; it is connected with laser; comprise time-delay soft start protective circuit, current-limiting protection circuit and three parts of power-on shock protection circuit; the semiconductor laser of overdriving, avoid that prevents the drive circuit submodule is subject to surge, and the protection laser safety starts and reliably working.
The step of the operation method of narrow linewidth tuneable laser system of the present invention is as follows:
I, beginning
The energising of power management submodule, give tunable laser module and microcontroller power supply, the microcontroller initialization;
II, default data frame
Microcontroller sends one group of default data frame to laser, comprises power, wavelength and the channel spacing of the output light of laser, and this default data frame need to set in advance according to the user;
III, read the return data frame
Laser is received the default data frame, by this operation, sends the return data frame to microcontroller simultaneously; Microcontroller receives that the operation of return data frame acknowledgment laser is errorless, and the work state information that laser is current sends main frame to; Otherwise return to Step II, microcontroller sends the 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 regularly to detect; And the magnitude of voltage that the laser of storing lower than it when detection voltage works is judged as power down, return to Step II, microcontroller sends the default data frame to laser again; Regularly sense cycle is set at microcontroller;
V, host computer control instruction
When needs upgrade wavelength, luminous power, the channel spacing of laser, administrative staff send from the control interface of main frame to microcontroller interrupts one or more data current operation request and change wavelength, luminous power, channel spacing;
VI, send more new data frame
Microcontroller Receiving Host control command, and carry out immediately interrupt requests, more new data frame sends to laser;
The return data frame of VII, reading update data frame
Laser is received more new data frame, by this, in new state operation, sends the return data frame to microcontroller simultaneously; Microcontroller receives that return data frame acknowledgment laser is by more the new state operation is errorless, and the work state information that laser is current sends main frame to; Otherwise return to 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 regularly to detect; Otherwise return to step VI, microcontroller sends more new data frame to laser again.
Compared with prior art, the advantage of narrow linewidth tuneable laser system of the present invention and operation method is: 1, the power management submodule has realized that positive electricity is pressed onto the conversion of negative voltage, the tunable laser module of native system only needs the single power supply of 9～20V, and laser module is easier to be embedded in the middle of other system; 2, realized 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 microcontroller implementation the self check of laser module, solved the power-off problems of laser, to guarantee the operation of special occasions laser, do not interrupt, strengthened robustness and the practicality of tunable laser; 4, protective circuit is guaranteed the safety of laser start-up and operation.
The accompanying drawing explanation
The structured flowchart of this narrow linewidth of Fig. 1 tuneable laser system 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 of Fig. 3 tuneable laser system.
Embodiment
Below in conjunction with the accompanying drawing of embodiment, the present invention is further described.
Narrow linewidth tuneable laser system embodiment
The structured flowchart of this narrow linewidth tuneable laser system embodiment is shown in Fig. 1.Drive circuit submodule on the tunable laser module contains semiconductor laser and is arranged on circuit board, that be connected with laser, wavelength adjustable control submodule, detection of power loss submodule and protective circuit.This routine semiconductor laser is 26 pin butterfly refrigeration external-cavity semiconductor laser.Microcontroller is connected with the digital-to-analogue conversion submodule by serial peripheral equipment interface SPI (Serial Peripheral Interface), and the output of digital-to-analogue conversion submodule connects the drive circuit submodule.
This example adopts the STC15L2K60S2 microcontroller, it is inner integrated high accuracy R/C clock, and under normal temperature, to waft be 5 ‰ to temperature, need not separately add external crystal-controlled oscillation, operating voltage is 2.4～3.6V, shares the power supply of laser module, without extra power supply.This routine microcontroller is connected with the main frame that is placed in far-end through four line digital interface RS422.Two groups of High-speed Asynchronous Secial Communication ports, Receiving Host sends simultaneously order and return laser light device module status information.
The drive circuit submodule comprises the high stability that offers laser, constant-current source and thermoelectric refrigerating unit (TEC) control circuit of low-ripple coefficient, by microprocessor controls.
The 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, the input of switching regulator and output also are connected to respectively input capacitance C
inwith output capacitance C
out, electric capacity, export negative voltage V by way of compensation
out.Need the electric current of 1.5A when starting due to laser module, under the high load currents condition, cabling and assembly layout are most important, otherwise large switching current will cause circuit to break down.The printed circuit plate portion of the installation power management submodule of this example is without covering copper face, input capacitance C
inbe less than 3mm with the distance of switching regulator input pin, the two wire length is 0.8mm～1.2mm, output capacitance C
outcabling and switching regulator the distance be more than or equal to 10mm, avoid large switching current will cause circuit to break down.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 on precision instrument amplifier and laser circuit is in parallel, and precision instrument amplifier is connected with microcontroller through analog to digital converter.Noise on precision instrument amplifier AD8221 power pins can make its performance worsen, and makes it to obtain galvanic current and presses power supply, and its power pins adds shunt capacitance with decoupling.
This example adopts the single supply system, the input range of instrument amplifier in the voltage range of instrument amplifier power supply, between its positive supply and earth potential, poor its supply voltage that is less than of instrument amplifier output voltage.
Described protective circuit submodule comprises time-delay soft start protective circuit, current-limiting protection circuit and three parts of power-on shock protection circuit.
The operation method embodiment of narrow linewidth tuneable laser system
The operation method that this example is above-mentioned narrow linewidth tuneable laser system embodiment, the flow chart of microcontroller operation as shown in Figure 3, comprises the steps:
I, beginning
The energising of power management submodule, give tunable laser module and microcontroller power supply, the microcontroller initialization;
II, default data frame
Microcontroller sends one group of default data frame to laser, comprises power, wavelength and the channel spacing of the output light of laser, and this default data frame need to set in advance according to the user, and the operating state of laser acquiescence is set; The Output optical power that this routine default data frame is laser is 15.5dBm, and channel spacing is 50GHz, and wavelength is 1550.12nm.
III, read the return data frame
Laser is received the default data frame, by this operation, sends the return data frame to microcontroller simultaneously; Microcontroller receives that the operation of return data frame acknowledgment laser is errorless; Otherwise return to Step II, microcontroller sends the 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 regularly to detect; Otherwise return to Step II, microcontroller sends the default data frame to laser again; Regularly sense cycle is set at microcontroller, and this example is made as 100 milliseconds of ms;
V, host computer control instruction
When needs upgrade wavelength, luminous power, the channel spacing of laser, administrative staff send from the control interface of main frame to microcontroller interrupts one or more data current operation request and change wavelength, luminous power, channel spacing;
Control system interface by main frame can complete the upper and lower any adjustment of wavelength by channel spacing in adjustable extent, also can in adjustable extent, directly input any adjustment that required wavelength value realizes wavelength.The wavelength adjustable extent of this example based on the ITU channel spacing is 1528.38nm～1563.45nm.This example arranges 10,14, tri-kinds of Output optical power working points of 15.5dBm.The multiple ITU channel spacings such as 50GHz, 100GHz or 200GHz can be selected in the centre wavelength interval;
VI, send more new data frame
Microcontroller Receiving Host control command, and carry out immediately interrupt requests, more new data frame sends to laser;
The return data frame of VII, reading update data frame
Laser is received more new data frame, by this, in new state operation, sends the return data frame to microcontroller simultaneously; Microcontroller receives that return data frame acknowledgment laser is by more the new state operation is errorless; Otherwise return to 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 regularly to detect; Otherwise return to step VI, microcontroller sends more new data frame to laser again.
Above-described embodiment, be only the specific case that purpose of the present invention, technical scheme and beneficial effect are further described, and the present invention not is defined in this.All any modifications of making, be equal to replacement, improvement etc., within all being included in protection scope of the present invention within scope of disclosure of the present invention.
Claims (10)
1. the narrow linewidth tuneable laser system, include the tunable laser module, and drive circuit submodule on the tunable laser module contains semiconductor laser and is arranged on circuit board, that be connected with laser and wavelength adjustable control submodule is characterized in that:
Also comprise the power management submodule, the critical piece of power management submodule is switching regulator, the input of positive voltage access switching regulator, output termination inductance and the diode of switching regulator, output negative voltage.
2. narrow linewidth tuneable laser system according to claim 1 is characterized in that:
The input of described switching regulator and output also are connected to respectively input and output capacitors.
3. narrow linewidth tuneable laser system according to claim 2 is characterized in that:
The printed circuit plate portion of described power management submodule is installed without covering copper face, the distance of described input capacitance and switching regulator input pin is less than 3mm, and 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.
4. narrow linewidth tuneable laser system according to claim 2 is characterized in that:
Output current is more than or equal to the linear voltage regulator of 1.5A as power management submodule positive voltage source.
5. according to the described narrow linewidth tuneable laser system of any one in claim 1 to 4, it is characterized in that:
Described microcontroller is connected with the drive circuit submodule through the digital-to-analogue conversion submodule, and microcontroller is connected with main frame through four line digital interfaces.
6. narrow linewidth tuneable laser system according to claim 5 is characterized in that:
Also be furnished with the detection of power loss submodule, this detection of power loss submodule comprises precision instrument amplifier and analog to digital converter, and the detection resistance on precision instrument amplifier and laser circuit is in parallel, and precision instrument amplifier is connected with microcontroller through analog to digital converter.
7. narrow linewidth tuneable laser system according to claim 6 is characterized in that:
The power pins of described precision instrument amplifier adds shunt capacitance.
8. narrow linewidth tuneable laser system according to claim 6 is characterized in that:
The input range of described instrument amplifier in its power supply voltage range, poor its supply voltage scope that is less than of its output voltage.
9. narrow linewidth tuneable laser system according to claim 5 is characterized in that:
Also be furnished with the protective circuit submodule, it is connected with laser, comprises time-delay soft start protective circuit, current-limiting protection circuit and three parts of power-on shock protection circuit.
10. the operation method of narrow linewidth tuneable laser system according to claim 6 is characterized in that step is as follows:
I, beginning
The energising of power management submodule, give tunable laser module and microcontroller power supply, the microcontroller initialization;
II, default data frame
Microcontroller sends one group of default data frame to laser, comprises power, wavelength and the channel spacing of the output light of laser, and this default data frame need to set in advance according to the user;
III, read the return data frame
Laser is received the default data frame, by this operation, sends the return data frame to microcontroller simultaneously; Microcontroller receives that the operation of return data frame acknowledgment laser is errorless, and the work state information that laser is current sends main frame to; Otherwise return to Step II, microcontroller sends the 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 regularly to detect; And the magnitude of voltage that the laser of storing lower than it when detection voltage works is judged as power down, return to Step II, microcontroller sends the default data frame to laser again; Regularly sense cycle is set at microcontroller;
V, host computer control instruction
When needs upgrade wavelength, luminous power, the channel spacing of laser, administrative staff send from the control interface of main frame to microcontroller interrupts one or more data current operation request and change wavelength, luminous power, channel spacing;
VI, send more new data frame
Microcontroller Receiving Host control command, and carry out immediately interrupt requests, more new data frame sends to laser;
The return data frame of VII, reading update data frame
Laser is received more new data frame, by this, in new state operation, sends the return data frame to microcontroller simultaneously; Microcontroller receives that return data frame acknowledgment laser is by more the new state operation is errorless, and the work state information that laser is current sends main frame to; Otherwise return to the 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 regularly to detect; Otherwise return to step VI, microcontroller sends more new data frame to laser again.
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Cited By (3)
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| CN108390728A (en) * | 2018-02-24 | 2018-08-10 | 青岛海信宽带多媒体技术有限公司 | Optical module electrification control method and device |
| CN112198746A (en) * | 2019-07-08 | 2021-01-08 | 深圳市Tcl高新技术开发有限公司 | Laser light source drive circuit and system |
| US11901699B2 (en) | 2020-11-20 | 2024-02-13 | Suzhou Institute Of Nano-Tech And Nano-Bionics (Sinano) , Chinese Academy Of Sciences | Narrow linewidth laser |
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| US11901699B2 (en) | 2020-11-20 | 2024-02-13 | Suzhou Institute Of Nano-Tech And Nano-Bionics (Sinano) , Chinese Academy Of Sciences | Narrow linewidth laser |
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