CN110061800B - Wavelength stabilizing system of tunable DWDM wavelength optical node - Google Patents
Wavelength stabilizing system of tunable DWDM wavelength optical node Download PDFInfo
- Publication number
- CN110061800B CN110061800B CN201910312830.0A CN201910312830A CN110061800B CN 110061800 B CN110061800 B CN 110061800B CN 201910312830 A CN201910312830 A CN 201910312830A CN 110061800 B CN110061800 B CN 110061800B
- Authority
- CN
- China
- Prior art keywords
- wavelength
- laser
- control
- temperature
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0213—Groups of channels or wave bands arrangements
Abstract
The invention discloses a wavelength stabilizing system of a tunable DWDM wavelength optical node, which comprises a wavelength selection switch and a laser tube control circuit, wherein the laser tube control circuit is connected with a laser tube; the wavelength selection switch is connected with the microprocessor, the microprocessor is connected with a digital-to-analog conversion circuit which is controlled according to DWDM wavelength selected by the wavelength selection switch, and a thermistor which is used for collecting the temperature of the laser tube, the thermistor is arranged in the laser in a contact way and is connected with a precise operational amplifier circuit which compares sampling voltage with analog voltage, the precise operational amplifier circuit is connected with a refrigerator control circuit, the refrigerator control circuit is connected with a semiconductor refrigerator, the semiconductor refrigerator is arranged in the laser in a contact way and is arranged in the laser tube, and the refrigerator control circuit controls the power supply current and the power supply direction according to the comparison result of the precise operational amplifier circuit so that the semiconductor refrigerator can carry out heating or refrigerating work, thereby stabilizing the temperature of the laser tube of the laser at a set value.
Description
Technical Field
The invention belongs to the field of limited televisions, and particularly relates to a wavelength stabilizing system of a tunable DWDM wavelength optical node.
Background
With the increasing demand of network bandwidth, the number of optical nodes used in the network increases dramatically, in order to eliminate optical beat frequency interference (OBI), a Dense Wavelength Division Multiplexing (DWDM) technology may be adopted, the wavelength of optical signals returned by the optical nodes is designed to be tunable, and the problem of OBI noise is solved by adopting optical nodes with different returned optical wavelengths. At present, a coaxial TOSA laser, an external electronic refrigerator and a thermistor are adopted, and an operational amplifier circuit is adopted to control the electronic refrigerator, so that the tuning function of the output wavelength of the laser is realized. However, the effect of the scheme is not ideal, the stability of the wavelength of the output optical signal is not good, the output wavelength has a fluctuation range of 0.1-0.3 nm, and optical beat frequency interference can be generated when the optical node is actually used. If the wavelength-tuned DFB laser adopting butterfly package is very expensive, it cannot be used in the very large required customer premises RFoG optical node.
Disclosure of Invention
In order to overcome the defects in the prior art, namely, in view of the situation that the wavelength stability is not ideal enough when the current refrigerator is externally arranged, the invention provides a wavelength stabilizing method of a tunable DWDM wavelength optical node, which can effectively solve the problem of OBI (optical beat interference) noise of a bidirectional HFC network return channel and reduce the expenditure cost at the same time.
The technical scheme adopted by the invention is as follows:
a wavelength stabilizing system of a tunable DWDM wavelength optical node is applied to a wavelength-tuned RFoG optical node, is arranged at a user end, comprises a wavelength selection switch and a laser tube control circuit, and is characterized in that: the laser tube control circuit is connected with a laser tube which outputs rated optical power after controlling bias current; the wavelength selection switch is connected with a microprocessor, the microprocessor is connected with a digital-to-analog conversion circuit controlled according to the DWDM wavelength selected by the wavelength selection switch and a thermistor used for collecting the temperature of the laser tube, the thermistor is arranged in the laser in a way of contacting with the laser tube, the thermistor and the digital-to-analog conversion circuit are connected with a precise operational amplifier circuit for comparing sampling voltage with analog voltage, the precise operational amplifier circuit is connected with a refrigerator control circuit, the refrigerator control circuit is connected with a semiconductor refrigerator, the semiconductor refrigerator is arranged in the laser and is in contact with the laser tube, and the refrigerator control circuit controls the power supply current and the power supply direction according to the comparison result of the precise operational amplifier circuit so that the semiconductor refrigerator can perform heating or refrigerating work, and the temperature of the laser tube of the laser is stabilized at a set value. The invention adopts a laser with a built-in refrigerator and a thermistor, and through a digital-to-analog conversion circuit, a precise operational amplifier control circuit, a semiconductor refrigerator control circuit and microprocessor control software, the optical wavelength can be stably controlled within a required wavelength range, the optical wavelength tunable function of the whole machine is realized, and the wavelength stability reaches the high precision of 0.001 nm.
Further, the digital-to-analog conversion circuit adopts a digital-to-analog chip of AD5647R of the american AD company.
Further, the output channel of the digital-analog chip is provided with control voltage values corresponding to 16 wavelengths and voltage values corresponding to 1 initial wavelength, and after the control voltage values are compared with the sampling voltage of the thermistor arranged in the laser, the corresponding control values are output to control the refrigerating current or the heating current of the semiconductor refrigerator, so that the working temperature of the laser tube reaches a required value, and further the required tuning optical wavelength is obtained.
Further, the calculation steps of the control voltage values of 16 wavelengths and the control values of the corresponding wavelengths are as follows:
(1) presetting voltage values Va00 of 1 initial wavelength to perform basic test on an output channel A of the digital-analog chip, and adjusting the voltage value of the output channel A of the digital-analog chip through control software;
control voltage value Va00 of wavelength 1.5 Rb/(Rb +10)1)
Wherein Rb is the laser thermal resistance value at 25 ℃ provided by a laser manufacturer;
(2) after the adjustment is finished, setting and storing each dial position from the lowest dial position to the highest dial position;
(3) inputting corresponding wavelength into each dial position, and automatically calculating control voltage values Va 01-Va 16 of 16 wavelengths by combining a K coefficient and an Rb value;
(4) calculating and storing the control value of each wavelength;
the calculation of the respective control values Daxx is as follows:
RL＝10*Va01/(1.5-Va01) 2)
TL＝1/(LN(RL/10)/3930+1/298.15)-273.15 3)
Txx＝∑(2.5/(§xx))+TL 4)
Rtxx＝10*Exp(3900*(1/(Txx+273.15)-1/298.15)) 5)
Daxx＝4096*Rtxx/(Rtxx+10) 6)
where RL is the lowest wavelength laser thermistor; TL is the temperature of the laser at the lowest wavelength and is calculated by a thermistor of the laser; t isxxThe temperature of the laser with each wavelength is expressed, xx is 2-16, the lowest wavelength is the 1 st wavelength, 2 is the 2 nd wavelength, and the like; xx is a temperature wavelength change rate parameter, which can be set through a menu; rtxxThe resistance value represents the thermal resistance value of the laser at each wavelength, and xx is 2-16; da (Da)xxThe DA value converted by the A channel control voltage of each wavelength dial gear is represented, and xx is 2-16; LN is the logarithm of base e.
Further, the wavelength stabilizing control mode of the laser is that when the laser is started, a transition period is firstly passed, then the control voltage is smoothly adjusted to the control voltage of the current dial position, the laser is enabled to work at the set temperature of the dial position, the output wavelength of the laser is the wavelength of the set dial position, the instant working temperature of the laser is sampled at regular time in the working process, the voltage value corresponding to the current temperature of the laser is calculated according to the sampling value, the voltage value is compared with the control voltage value of the dial position, if the voltage value corresponding to the current temperature of the laser is consistent with the control voltage value of the dial position, the laser stably works at the temperature of the current dial position, if the voltage value corresponding to the temperature of the current laser deviates from the control voltage value of the dial position by more than 0.1V, the output wavelength of the laser already deviates from the set value, the laser is closed at this time, and after 20 seconds, the laser is restarted to enable the laser to work at the next dial position, and so on until the gear can be stably shifted. The invention obtains the wavelength change rule at different temperatures by testing the wavelength characteristics output by the laser tube, and carries out relatively accurate voltage control and compensation according to the change of the thermistor value of the laser tube, thereby ensuring the realization of stable wavelength tuning.
Further, the precision operational amplifier of the precision operational amplifier control circuit adopts MAX4238 of Maxim company in the United states. In the precise operational amplifier control circuit, the voltage value and the loop gain of the precise operational amplifier are tested and calculated, a proper feedback value is selected according to the thermistor performance of the laser and the temperature variation parameter of the wavelength of the laser, and meanwhile, the signal line of the operational amplifier is subjected to ground loop protection, so that the signal cleanliness is improved, and good control precision is realized.
Further, the driving chip in the refrigerator control circuit adopts MAX8521E from Maxim corporation in America. The refrigerator control circuit is matched with a peripheral precise operational amplifier control circuit and a digital-to-analog conversion circuit, selects excellent related components, and realizes the refrigeration and heating control of the semiconductor refrigerator through reasonable planning and layout of the circuit and optimized debugging of circuit parameters, so that the laser can stably work at the required wavelength.
The invention has the beneficial effects that:
1. the output optical signal wavelength of the tunable DWDM RFoG optical node adopting the wavelength stabilizing technology can be continuously adjustable in 16 different DWDM wavelength ranges, and the OBI (optical beat frequency interference) noise problem of a bidirectional HFC network return channel can be effectively solved by using a plurality of RFoG optical nodes with stable DWDM wavelength in a cable television network.
2. The optical node developed by adopting the wavelength stabilization technical scheme of the invention can meet the requirements of seamless evolution and operation expenditure reduction in the process of the evolution of a cable television operator to the all-fiber network infrastructure, and has stronger market competitiveness and better market prospect.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
FIG. 2 is a schematic diagram of the pin arrangement after the refrigerator and thermistor are built in according to the present invention.
Fig. 3 is a flow chart of the wavelength setting of the laser of the present invention.
Fig. 4 is a flow chart of the stabilization control of the laser of the present invention.
FIG. 5 is a table showing the correspondence between the control voltage values of the respective bits and the input DA values of the corresponding control chips according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
Referring to fig. 1, a wavelength stabilizing technique for a tunable DWDM wavelength optical node is applied to a wavelength-tuned RFoG optical node, and is installed at a user end, and includes a wavelength selective switch 1, where the wavelength selective switch 1 is connected to a microprocessor 2, the microprocessor 2 controls a digital-to-analog conversion circuit 3 according to a DWDM wavelength selected by the wavelength selective switch 1, the digital-to-analog conversion circuit 3 is connected to a precision operational amplifier circuit 4 to amplify an analog signal, the precision operational amplifier circuit 4 is connected to a refrigerator control circuit 5, the refrigerator control circuit 5 is connected to a semiconductor refrigerator 6, and the semiconductor refrigerator is enabled to perform heating or cooling work by controlling a magnitude of a power supply current and a power supply direction. The laser tube control circuit 8 controls the bias current of the laser tube 9, so that the laser tube 9 outputs rated optical power. The semiconductor refrigerator 6 is in close contact with the laser tube 9, namely the semiconductor refrigerator 6 is arranged in the laser, the thermistor 7 is also in close contact with the laser tube 9, namely the thermistor 7 is arranged in the laser and used for collecting the temperature of the laser tube, the microprocessor 2 determines the working temperature of the laser according to the sampling value of the thermistor 7, and the control of the output wavelength of the laser tube 9 is realized through the power supply current and the power supply direction of the refrigerator control circuit 5. The thermistor 7 is connected with the precision operational amplifier circuit 4, and the temperature of the laser tube 9 of the laser is stabilized at a set value through comparison of the precision operational amplifier.
To realize the wavelength tunable function, the wavelength of the output light needs to be controlled. The realization principle is as follows: the microprocessor 2 outputs a control signal, converts the control signal into an analog voltage signal through a digital-analog converter, compares the analog voltage signal with the sampling voltage of the thermistor 7 arranged in the laser, and drives the semiconductor refrigerator 6 arranged in the laser by the driving chip of the refrigerator control circuit 5 according to a set value to realize the control of the working state of the refrigerator and stabilize the temperature of the laser tube of the laser at the set value. The stable control of the wavelength of the output optical signal in a required range is realized through the digital-to-analog conversion circuit 3, the precise operational amplifier circuit 4, the refrigerator control circuit 54 and the microprocessor 2 control software, and the optical wavelength tunable function of the whole machine is realized. The pin arrangement of the laser tube with the built-in semiconductor refrigerator and the thermistor of the embodiment is shown in figure 2.
In the present embodiment, in the design of the digital-to-analog conversion circuit 3, the digital-to-analog chip used is AD5647R of AD corporation in usa. Referring to the wavelength interval DWDM standard of ITU-T G.962, considering that an interval is every 0.25nm and a wavelength variation range of 3.75nm is adopted by combining the performance characteristics of a laser, wherein the wavelength range is 1610 +/-10 nm, 16 tunable wavelength control points are totally arranged, and 16 wavelength dial positions are set. Thus, 16 voltage values (17 voltage values when 1 initial wavelength voltage is added) need to be set for the output channel of the AD5647R, so as to compare with the sampling voltage of the laser built-in thermistor, control the cooling current (or heating current), make the laser tube work at the required temperature, and further obtain the corresponding tuned optical wavelength. By testing the wavelength characteristics output by the laser tube, the wavelength change rule at different temperatures is obtained, relatively accurate voltage control and compensation are performed according to the change of the thermistor value, and the realization of stable tuning wavelength is ensured.
In the present embodiment, the precision operational amplifier used in the precision operational amplifier circuit 4 is MAX4238 of Maxim corporation in the united states. The voltage value and the loop gain of the precision operational amplifier are tested and calculated, then a proper feedback value is selected according to the thermistor performance of the laser and the temperature variation parameter of the laser wavelength, and meanwhile, the ground loop protection is carried out on the operational signal line, so that the signal cleanliness is improved, and the good control precision is realized.
The heat dissipation of the semiconductor cooler will directly affect the temperature control effect, especially in cooling mode. Therefore, no matter the refrigerator is internally arranged or externally arranged, the heat dissipation of the laser is a key factor of the wavelength tuning and stability of the whole optical wave, and particularly when the temperature of the working environment is higher, the examination on the refrigerating capacity is larger, and the good heat dissipation of the refrigerator is required. The heat dissipation process of the refrigerator needs the whole machine to provide a heat dissipation block with a large area, the design of the built-in refrigerator is adopted, and the refrigerator is close to the core laser tube of the laser, so that a good heat dissipation effect can be achieved, the performance of the refrigerator of the laser is effectively improved, the optical working wavelength and the output optical power with stable performance are obtained, and wavelength tunable and stable work is achieved.
In addition, in order to realize the accurate test of the temperature of the laser and provide reliable and reasonable test quantity for the precision of the temperature and wavelength control quantity, a high-performance thermistor needs to be close to the laser tube of the laser as much as possible in the laser design, and a proper optical isolator needs to be integrated in the structural design in order to ensure the good signal-to-noise ratio of the laser and reduce the echo interference; to reduce optical coupling losses.
The driving chip in the refrigerator control circuit 5 adopts MAX8521E of Maxim corporation, and cooperates with the digital-to-analog conversion circuit and the precise operational amplifier circuit to realize the refrigeration or heating control of the semiconductor refrigerator, so that the laser can work stably at the required wavelength.
And (3) testing a control circuit of the semiconductor refrigerator, comparing the heating and refrigerating performances of the laser of the built-in refrigerator with the heating and refrigerating performances of the laser of the external refrigerator, and inspecting the related refrigerating efficiency and the precision operational amplifier control precision. When an external refrigerator laser is adopted, and the precision operational amplifier control mode cannot realize control precision, the digital-analog chip is directly adopted to combine with microprocessor software to control the temperature of the electronic refrigerator, and relevant software testing and adjustment are carried out, but ideal wavelength stability control cannot be achieved. Therefore, the laser with the built-in semiconductor refrigerator 6 is adopted in the invention, the response speed of the built-in thermistor 7 is very high, the control is carried out by adopting the precise operational amplifier circuit 4, the control and the response of the thermistor are basically synchronous, at the moment, the control precision can be well realized by a precise operational amplifier control mode through repeated testing and adjustment of related control software, and the wavelength stability can reach the high precision of 0.001 nm.
The basic principle of wavelength control of tunable lasers is that the wavelength of the laser varies with temperature. The control software realizes the stable output of the optical wavelength and the optical power by controlling the temperature of the laser and the related optical wavelength temperature compensation and other technologies.
Software sets that each complete machine can set 16 wavelength gears, each wavelength interval is 0.25nm, and the wavelength change of 3.75nm is realized totally. Then, a lambda 00 is defined as an initial wavelength, and a basic test is carried out to obtain related data, so that the purpose of controlling the target wavelength can be realized.
Referring to fig. 3, the steps of calculating the control voltage values of 16 wavelengths and the control values of the corresponding wavelengths according to the present invention are as follows:
(1) presetting voltage values Va00 of 1 initial wavelength lambda 00 to perform basic test on an output channel A of the digital-analog chip, and adjusting the voltage value of the output channel A of the digital-analog chip through control software;
control voltage value Va00 of wavelength 1.5 Rb/(Rb +10)1)
Wherein Rb is the laser thermal resistance value (generally 10k omega) at 25 ℃ provided by a laser manufacturer;
(2) after the adjustment is finished, setting and storing each dial position from the lowest dial position to the highest dial position;
(3) inputting corresponding wavelength into each dial position, and automatically calculating control voltage values Va 01-Va 16 of 16 wavelengths by combining a K coefficient and an Rb value; k is defined as the resistance change coefficient (generally 3900) of the thermistor under the temperature change.
(4) Calculating and storing the control value of each wavelength;
the calculation of the respective control values Daxx is as follows:
RL＝10*Va01/(1.5-Va01) 2)
TL＝1/(LN(RL/10)/3930+1/298.15)-273.15 3)
Txx＝∑(2.5/(§xx))+TL 4)
Rtxx＝10*Exp(3900*(1/(Txx+273.15)-1/298.15)) 5)
Daxx＝4096*Rtxx/(Rtxx+10) 6)
where RL is the lowest wavelength laser thermistor; TL is the temperature of the laser at the lowest wavelength and is calculated by a thermistor of the laser; t isxxThe temperature of the laser with each wavelength is expressed, xx is 2-16, the lowest wavelength is the 1 st wavelength, 2 is the 2 nd wavelength, and the like; xx is a temperature wavelength change rate parameter, which can be set through a menu; rtxxThe resistance value represents the thermal resistance value of the laser at each wavelength, and xx is 2-16; da (Da)xxThe DA value converted by the A channel control voltage of each wavelength dial gear is represented, and xx is 2-16; LN is the logarithm of base e.
Taking the lowest wavelength of 1609.026nm as an example, the table shows the calculated control voltage value of each dial of the laser and the input DA value of the corresponding control chip (i.e. the control value of each wavelength, which is used for software implementation and is used for controlling the voltage value of each dial in principle), as shown in fig. 5.
Referring to fig. 4, the wavelength stabilizing control method of the laser device in this embodiment is that when the laser device is turned on, a transition period is first passed, then the control voltage is smoothly adjusted to the control voltage of the current dial, the laser device is made to operate at the set temperature of the dial, the output wavelength of the laser device is the wavelength of the set dial, the instant operating temperature of the laser device is sampled at regular time during the operating process, the voltage value corresponding to the current temperature of the laser device is calculated according to the sampling value, the voltage value is compared with the control voltage value of the dial, if the two values are consistent, the laser device stably operates at the temperature of the current dial, if the voltage value corresponding to the temperature of the laser device deviates from the control voltage value of the dial by more than 0.1V, the output wavelength of the laser device has deviated from the set value, the laser device is turned off at this time, and the laser device is restarted after 20 seconds, and enabling the laser to work at the next shifting position, and so on until the laser can be stabilized at the corresponding shifting position. The invention obtains the wavelength change rule at different temperatures by testing the wavelength characteristics output by the laser tube, and carries out relatively accurate voltage control and compensation according to the change of the thermistor value of the laser tube, thereby ensuring the realization of stable wavelength tuning. Wherein the A channel in the figure refers to the A channel of AD 5627R; the B channel refers to the B channel of AD 5627R; v AD5/1024 (AD ═ AD); the counter is used for counting the temperature sampling times of the laser; the waiting state refers to a transition state in the middle of switching the laser from off to on; and T refers to the current working temperature of the laser, and is calculated by the temperature sampling voltage value of the laser.
The invention adopts the tunable DWDM RFoG optical node of the wavelength stabilizing technology, the wavelength of the output optical signal can be continuously adjusted in 16 different DWDM wavelength ranges, and the OBI (optical beat frequency interference) noise problem of the return channel of the bidirectional HFC network can be effectively solved by using a plurality of RFoG optical nodes with stable DWDM wavelength in the cable television network.
The product developed by adopting the wavelength stabilization technical scheme of the invention can meet the requirements of seamless evolution and operation expenditure reduction in the process of the evolution of a cable television operator to the all-fiber network infrastructure, and has stronger market competitiveness and better market prospect.
Claims (5)
1. A wavelength stabilizing system of a tunable DWDM wavelength optical node is applied to a wavelength-tuned RFoG optical node, is arranged at a user end, comprises a wavelength selection switch and a laser tube control circuit, and is characterized in that: the laser tube control circuit is connected with a laser tube which outputs rated optical power after controlling bias current; the wavelength selection switch is connected with a microprocessor, the microprocessor is connected with a digital-to-analog conversion circuit controlled according to the DWDM wavelength selected by the wavelength selection switch and a thermistor used for collecting the temperature of the laser tube, the thermistor is arranged in the laser in a way of contacting with the laser tube, the thermistor and the digital-to-analog conversion circuit are connected with a precise operational amplifier circuit for comparing sampling voltage with analog voltage, the precise operational amplifier circuit is connected with a refrigerator control circuit, the refrigerator control circuit is connected with a semiconductor refrigerator, the semiconductor refrigerator is arranged in the laser and is in contact with the laser tube, and the refrigerator control circuit controls the power supply current and the power supply direction according to the comparison result of the precise operational amplifier circuit so that the semiconductor refrigerator can perform heating or refrigerating work, and the temperature of the laser tube of the laser is stabilized at a set value; the output channel of the digital-analog chip is provided with control voltage values corresponding to 16 wavelengths and voltage values corresponding to 1 initial wavelength, and after the control voltage values are compared with the sampling voltage of the thermistor arranged in the laser, the corresponding control values are output to control the refrigerating current or the heating current of the semiconductor refrigerator, so that the working temperature of the laser tube reaches a required value, and further the required tuning optical wavelength is obtained; the calculation steps of the control voltage values of 16 wavelengths and the control values of the corresponding wavelengths are as follows:
(1) presetting voltage values Va00 of 1 initial wavelength to perform basic test on an output channel A of the digital-analog chip, and adjusting the voltage value of the output channel A of the digital-analog chip through control software;
wavelength control voltage value Va00=1.5 Rb/(Rb +10)1)
Wherein Rb is the laser thermal resistance value at 25 ℃ provided by a laser manufacturer;
(2) after the adjustment is finished, setting and storing each dial position from the lowest dial position to the highest dial position;
(3) inputting corresponding wavelength into each dial position, and automatically calculating control voltage values Va 01-Va 16 of 16 wavelengths by combining a K coefficient and an Rb value; k is the resistance value change coefficient of the thermistor when the temperature changes;
(4) calculating and storing the control value DA of each wavelength;
the calculation of the respective control values Daxx is as follows:
RL=10*Va01/(1.5-Va01） 2)
TL=1/(LN(RL/10)/3930+1/298.15)-273.15 3)
Txx=∑(2.5/（§xx）)＋TL 4)
Rtxx=10*Exp(3900*(1/(Txx+273.15)-1/298.15)) 5)
Daxx=4096*Rtxx/( Rtxx+10) 6)
where RL is the lowest wavelength laser thermistor; TL is the temperature of the laser at the lowest wavelength and is calculated by a thermistor of the laser; t isxxRepresenting the temperature of the laser with each wavelength, xx = 2-16, the lowest wavelength is the 1 st wavelength, 2 is the 2 nd wavelength, and so on; xx is a temperature wavelength change rate parameter, which can be set through a menu; rtxxRepresents the thermal resistance value of the laser at each wavelength, and xx = 2-16; da (Da)xxThe control voltage is a DA value converted by the A channel control voltage of each wavelength dial gear, and xx = 2-16; LN is the logarithm of base e.
2. A wavelength stabilization system for a tunable DWDM wavelength optical node according to claim 1, characterized by: the digital-to-analog conversion circuit adopts a digital-to-analog chip AD5647R of American AD company.
3. A wavelength stabilization system for a tunable DWDM wavelength optical node according to claim 1, characterized by: the wavelength stabilizing control mode of the laser is that when the laser is started, a transition period is firstly passed, then the control voltage is smoothly regulated to the control voltage of the current dial position, the laser works at the set temperature of the dial position, at the moment, the output wavelength of the laser is the wavelength of the set dial position, the instant working temperature of the laser is regularly sampled in the working process, the voltage value corresponding to the current temperature of the laser is calculated according to the sampling value, the voltage value is compared with the control voltage value of the dial position, if the voltage value and the control voltage value are consistent, the laser stably works at the temperature of the current dial position, if the voltage value corresponding to the temperature of the current laser deviates from the control voltage value of the dial position by more than 0.1V, the output wavelength of the laser deviates from the set value, at the moment, the laser is closed, and after 20 seconds, the laser works at the next dial position, and so on until the gear can be stably shifted.
4. A wavelength stabilization system for a tunable DWDM wavelength optical node according to any of claims 1-3, characterized by: the precision operational amplifier of the precision operational amplifier circuit adopts MAX4238 of Maxim company in America.
5. A wavelength stabilization system for a tunable DWDM wavelength optical node according to any of claims 1-3, characterized by: the driving chip in the refrigerator control circuit adopts MAX8521E of Maxim company in America.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910312830.0A CN110061800B (en) | 2019-04-18 | 2019-04-18 | Wavelength stabilizing system of tunable DWDM wavelength optical node |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910312830.0A CN110061800B (en) | 2019-04-18 | 2019-04-18 | Wavelength stabilizing system of tunable DWDM wavelength optical node |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110061800A CN110061800A (en) | 2019-07-26 |
| CN110061800B true CN110061800B (en) | 2020-08-25 |
Family
ID=67319389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910312830.0A Active CN110061800B (en) | 2019-04-18 | 2019-04-18 | Wavelength stabilizing system of tunable DWDM wavelength optical node |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110061800B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111930162A (en) * | 2020-08-01 | 2020-11-13 | 武汉金信诺光电子有限公司 | Wavelength control circuit of optical module |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100472900C (en) * | 2006-03-31 | 2009-03-25 | 中兴通讯股份有限公司 | Wavelength control circuit for tunable laser |
| US20130070795A1 (en) * | 2011-09-16 | 2013-03-21 | Sumitomo Electric Industries, Ltd. | Method to switch emission wavelength of tunable laser diode |
| CN107069424A (en) * | 2017-06-15 | 2017-08-18 | 上海理工大学 | Distributed Feedback Laser drive device that high power low-power consumption is tunable |
| CN107394579A (en) * | 2017-07-04 | 2017-11-24 | 浙江省广电科技股份有限公司 | A kind of RFoG optical nodes of wavelength tuning |
| CN107390330B (en) * | 2017-08-31 | 2019-08-20 | 武汉光迅科技股份有限公司 | A kind of BOSA and its temprature control method of Wavelength tunable |
| CN107623249A (en) * | 2017-09-30 | 2018-01-23 | 武汉光迅科技股份有限公司 | A kind of tunable wave length module |
| CN109412013B (en) * | 2018-11-09 | 2023-08-08 | 武汉联特科技股份有限公司 | Wavelength tunable optical module, remote wavelength switching method and locking method |
-
2019
- 2019-04-18 CN CN201910312830.0A patent/CN110061800B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110061800A (en) | 2019-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107863676B (en) | Optical soliton crystal optical frequency comb generation system and method based on micro-ring resonant cavity | |
| JP5730469B2 (en) | Tunable light source device | |
| US5396059A (en) | Digital processor-controlled arrangement for monitoring and modifying system operating parameters | |
| CN112564802B (en) | Dimmable module and full-temperature wave locking method thereof | |
| US10162117B2 (en) | Uncooled operation of microresonator devices | |
| CN101369713A (en) | Control device for implementing optical module wavelength locking and method thereof | |
| CN110061800B (en) | Wavelength stabilizing system of tunable DWDM wavelength optical node | |
| JP4494781B2 (en) | Frequency locking of other area laser diodes | |
| CN104242051A (en) | External cavity tunable laser and cavity mode locking method thereof | |
| US20160204569A1 (en) | Wavelength tunable optical transmitter | |
| CN100472900C (en) | Wavelength control circuit for tunable laser | |
| WO2006082917A1 (en) | Laser device, laser device controller, method for controlling laser device, method for switching wavelength of laser device and laser device control data | |
| CN204858271U (en) | Laser system suitable for can carry atom interferometer | |
| JP2001196689A (en) | Method and device for stabilizing laser wavelength | |
| CN105762635A (en) | Wavelength control device for adjustable optical module, and method thereof | |
| JP5718034B2 (en) | Wavelength tunable light source device and method for controlling wavelength tunable light source device | |
| CN112086857B (en) | Method and device for acquiring splicing position of continuously tunable laser and corresponding method and device for outputting continuously tunable laser | |
| US10673205B2 (en) | Wavelength tunable laser module and method of controlling wavelength thereof | |
| CN103941790A (en) | High-speed wide-range high-precision programmable power source of multi-electrode active photoelectric devices | |
| CN115939931A (en) | Semiconductor laser control system | |
| Gupta et al. | Integration of cryocooled superconducting analog-to-digital converter and SiGe output amplifier | |
| US8301035B2 (en) | Optical communication apparatus, control apparatus, and method for controlling optical output | |
| CN115810976A (en) | Wavelength locker, tunable laser and wavelength locking control method | |
| JP3651764B2 (en) | Semiconductor laser wavelength control method and optical device | |
| CN106410603A (en) | Method and device for online regulation of performance parameters of semiconductor optical amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |