CN102761053A - Automatic power control method and device of laser - Google Patents

Automatic power control method and device of laser Download PDF

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Publication number
CN102761053A
CN102761053A CN2011101059687A CN201110105968A CN102761053A CN 102761053 A CN102761053 A CN 102761053A CN 2011101059687 A CN2011101059687 A CN 2011101059687A CN 201110105968 A CN201110105968 A CN 201110105968A CN 102761053 A CN102761053 A CN 102761053A
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CN
China
Prior art keywords
laser
automatic power
current
temperature
operating current
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CN2011101059687A
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Chinese (zh)
Inventor
林永辉
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厦门优迅高速芯片有限公司
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Priority to CN2011101059687A priority Critical patent/CN102761053A/en
Publication of CN102761053A publication Critical patent/CN102761053A/en

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Abstract

The invention discloses an automatic power control method of an optical fiber communication laser. The method is characterized by comprising the following steps: quickly initializing; directly giving a preset initial work current according to the environmental temperature valve; switching state; and leading the laser to enter an initial maintenance step or an automatic power regulation step according to an enable signal. The initial maintenance step allows the laser to maintain the initial work current valve; and the automatic power regulations step is to regulate the work current to make optical power of the laser to stably work in a reference optical power valve. According to the automatic power control method and the corresponding device thereof, a laser can be initialized before the automatic power control is implemented, has a preset current which is directly loaded according to the environmental temperature along with high response speed, and an initial current valve is provided to subsequent automatic power control.

Description

A kind of automatic power control method of laser and device

Technical field

The present invention relates to a kind of control method and accessory circuit that is used for the fiber optic communication field laser, specifically is a kind of automated power control and initial method and corresponding device thereof of laser.

Background technology

Fibre Optical Communication Technology has clear superiority in the wire signal transmission, for many years, its technology also reaches its maturity.A core component of optical fiber communication is a laser, the signal of telecommunication is converted into light signal transmits; This laser is generally semiconductor device, and its power must reasonably be controlled, and makes laser works at safe and reliable state, if power is excessive, then can influences the life-span of laser or even cause irreversible damage.Characteristics in view of laser are provided with some steps in the driving process of laser, be equipped with corresponding automatics, make that the power of laser is properly controlled.On the one hand, the power of laser must accurately be monitored, to ensure its trouble free service; On the other hand, must make the power fast and stable of laser, to realize the fast initialization of optical fiber communication in some applications.

Summary of the invention

Based on above demand, the present invention proposes a kind of automatic power control method of laser and realizes the device of this method, and its technical scheme is following:

A kind of automatic power control method of laser, it may further comprise the steps:

1) fast initialization step; Give laser preset, an initial operating current according to ambient temperature value;

2) state switch step; After accomplishing above-mentioned steps, make said laser can get into following steps according to an enable signal:

A) initial maintenance step; Said laser is kept had initial said operating current;

B) automated power set-up procedure; Adjust the light power stabilising that said operating current makes said laser and work in a reference light performance number.

Preferred person as the present technique scheme, can do following improvement in a preferred embodiment:

In one preferred embodiment, said fast initialization step is utilized a temperature-electric current mapping table, makes said ambient temperature corresponding one by one with preset said operating current; The scope of said ambient temperature comprises the temperature range of laser operate as normal.

In one preferred embodiment, said temperature-electric current mapping table comprises:

The element address has only one address designation, and this address designation adopts binary sequence coding; And

Location contents comprises preset said operating current, and this operating current adopts binary code to represent.

Wherein, all corresponding said address designation of each said ambient temperature.

In one preferred embodiment, in the said automated power set-up procedure, the luminous power of said laser is by monitoring in real time, uses one to compare with a reference voltage with the positively related detection voltage of said laser optical power, and its duty cycle comprises following two processes:

If said detection voltage is lower than said reference voltage, then promote said operating current; Be not less than said reference voltage until said detection voltage;

If said detection voltage is higher than said reference voltage, then reduce said operating current; Be not higher than said reference voltage until said detection voltage.

In one preferred embodiment, in the said automated power set-up procedure, all utilize the form of binary arithmetic operation to the increase and decrease of said operating current, the binary result after the increase and decrease converts an analog quantity into again in order to drive said laser.

In one preferred embodiment, in the step of said automated power control, said operating current is provided with a upper limit and a lower limit; Judge all to before the increasing/subtract of said operating current whether it has reached the said upper limit/lower limit each time,, then stop said operating current is increased/reducing if reach the said upper limit/lower limit.

As the device of realizing above-mentioned control method, its technical scheme is following:

A kind of automatic power-controlling device of laser, it comprises:

One initialization module, this initialization module have a temperature sensor and an initial output; Directly export initial working current value according to ambient temperature value from said initial output;

One monitoring module, this monitoring module have a state justify end; And

One control core, this control core connects said initial output and state justify end; Also have an Enable Pin simultaneously and be connected the drive end of laser with one.

This device can have following improvement in an embodiment:

In one preferred embodiment, in the middle of the said initialization module, has a temperature-electric current mapping block between said temperature sensor and the initial output.

In one preferred embodiment, said monitoring module comprises a photoelectric tube and the sample resistance of connecting with this photoelectric tube; Other has a comparator, and its output is as said state justify end; Said comparator negative terminal connects the voltage sampling end of said sample resistance, positive reference voltage of termination.

In one preferred embodiment, said initialization module comprises said temperature sensor, temperature A/D converter and the said temperature-electric current mapping block of cascade, and said degree-electric current mapping block connects said control core through said initial output;

Said control core comprises the counting device and the bias current module that contain counter; Said counting device has a data output end and is connected with said bias current module; Said initial output is positioned at said bias current module.

The invention has the beneficial effects as follows:

1. to laser tube, realizing carrying out initialization step before the automated power control, have a predetermined current that directly loads according to ambient temperature, response speed is fast, for follow-up automated power control initial current value is provided simultaneously.

2. the setting of temperature-electric current mapping table (module) makes predetermined current need not adjust direct loading; And can reach temperature-current function relation arbitrarily through the storage scheme of making by oneself; Not influenced by automatic control circuit, be suitable for the laser of multiple occasion and various temperature curve.

3. the digitlization adjustment is adopted in automated power control, and the controllability of its precision is strong, and accuracy in detection is high.

4. but the Enable Pin of external control makes device expand multiple function easily, sets the abundant automatic control program of kind.

Description of drawings

Embodiment is described further the present invention below in conjunction with accompanying drawing:

Fig. 1 is that the embodiment of the invention one and two flow process is generally pulled;

Fig. 2 is Fig. 1 embodiment step 1 flow chart;

Fig. 3 is Fig. 1 embodiment step 3 flow chart;

Fig. 4 is embodiment two step 3 flow charts;

Fig. 5 is embodiment three block diagrams;

Fig. 6 is embodiment four block diagrams.

Embodiment

Embodiment one:

In conjunction with Fig. 1, Fig. 2, the embodiment of the invention one flow process is generally pulled and step 1 flow chart.After the whole device electrifying startup to laser; Get into the step 1 of fast initialization; This step 1 details is seen Fig. 2: at first be temperature measured value step 11, this step 11 Laser Measurement device ambient temperature obtains an analog voltage one to one; This magnitude of voltage gets into temperature A/D switch process 12 then, in this step 12, aforesaid aanalogvoltage is converted into one 8 binary number; We so set: the interval of adjacent two values of this binary number characterizes 2 degrees centigrade the temperature difference.

By so setting, in suitable operating temperature range for example-20 ℃~60 ℃, can obtain 8 bits of a sequence; Binary number with this sequence is respectively memory unit address, then can make up a look-up table, fills in the unit of look-up table under the temperature that this address characterizes as location contents, is fit to the magnitude of current code of laser works.The binary system amount mapping that this has just set up one " temperature-electric current " is used for reading suitable current amount (binary number) in table addressing step 13.This magnitude of current gets into the step 14 of predetermined current, and the code conversion of the binary system magnitude of current is obtained the drive current of an analog quantity, offers laser works.From the step 1 of fast initialization shown in Figure 2, laser is operated in according to ambient temperature on the preset preferred current value when starting immediately, have than response speed faster.

After accomplishing fast initialization step 1, get into a state switch step 2 immediately.Use an enable signal EN in this step, be or not, do not make system get into initial maintenance step 4 or automated power set-up procedure 3 through what judge this enable signal.Initial maintenance step 4 makes the operating current work that the still above fast initialization step 1 of laser obtains, and does not adjust; Automated power set-up procedure 3 is then opposite, the luminous power of monitoring laser, and adjustment in time in real time.

Fig. 3 is Fig. 1 embodiment step 3 flow chart, and this step has been showed the details of automated power control (APC).This automatic control mainly utilizes a state value CMP to judge, and contrasts by a reference quantity that characterizes reference light power and to draw.This CMP value span is 0 and 1, and value 0 characterizes laser optical power and is higher than the reference light performance number, and 1 opposite.When this step begins; Magnitude of current code from the fast initialization step gets into a counter; Accomplish counter assignment step 20, get into electric current output step 22 again, with the magnitude of current drive laser work (D/A that comprises in this step and the similar step of this electric current code sign; The A/D conversion will be repeated no more, down together); Then, the luminous power of laser and reference light power compare, and obtain the CMP value; When the CMP value is 1; Expression laser optical performance number is not as good as the reference light performance number, so Counter Value stepping 1 returns electric current output step 22; Being laser diode current is promoted slightly, afterwards the luminous power of monitoring laser again; If the CMP value is 0, expression laser optical performance number surpasses the reference light performance number, so Counter Value successively decreases 1, returns electric current output step 22, and promptly laser diode current is reduced slightly.Order according to shown in Figure 3 ceaselessly circulates, and laser optical power can be stabilized in fluctuation in the minimum scope, realizes the stable of luminous power, and this step will last till initiatively cancellation.

Embodiment two:

Like Fig. 4, be embodiment two step 3 flow charts; The main flow process of embodiment two is identical with embodiment one, can represent with Fig. 1.But it is different that embodiment two compares in automated power controlled step 3 (Fig. 1) with embodiment one, like Fig. 4, and one of them institute's upper limit determining step 26, another lower limit determining step 27.It is after the 1 step branch that upper limit determining step 26 is set in the CMP value; Be used for judging whether its operating current has reached the upper limit, if then no longer promote laser power when laser optical power during less than reference light power; Leap to the circuit output element and continue circulation, otherwise just counter is increased 1; Lower limit determining step 27 set with CMP value be after the 0 step branch, be used for judging whether its operating current is in lower limit when laser optical power during greater than reference light power, if down counter value no longer then circulates but get back to the continuation of electric current output step.The power regulating method of this embodiment two is clamped down on the operating current bound of laser, and operating state is more safe and reliable.

Embodiment three:

Fig. 5 is embodiment three block diagrams, and this embodiment three is the devices that can realize step shown in Figure 1.Have temperature sensor in the initialization module 42, measures ambient temperature is connected to control core 41 through initial output Din in real time; Monitoring module 43 is connected to control core 41 through a state justify end CMP; Control core 41 also has an Enable Pin EN except connecting initial output Din and state justify end CMP, be communicated with laser LD through drive end Drv simultaneously.

When at first Enable Pin EN is 1 (high level); Temperature sensor in the initialization module 42 is with measured preferred working current value of ambient temperature mapping; Transfer to control core 41 through initial output Din, control core 41 with this working current value be treated to can drive laser LD current signal.Enable Pin EN deploys 0 (low level) outside then, and initial output Din no longer influences control core 41.

The luminous power of monitoring module 42 real-time monitoring laser pipe LD feeds back to control core 41 through the feedback signal that monitoring is obtained from state justify end CMP at this moment, and reach laser tube LD operating current and in an acceptable scope, fluctuate, promptly be steady-working state.

Embodiment four:

Fig. 6 is embodiment four block diagrams, and this embodiment four is the devices that can realize step shown in Figure 1.The analog signal voltage value that temperature sensor 35 obtains gets into temperature A/D converter 36; 8 binary codes that obtain are corresponding one by one with the address in temperature-electric current mapping block 37; Thereby a concrete temperature value can obtain the preferred electric current code of this temperature value addressed memory storage in temperature-electric current mapping block 37, and this code gets into counting device 31 from the Din end.Wherein the Din end promptly is initial output, and the Dout end promptly is said data output end, and the CMP end promptly is the state justify end; Counting device 31 and bias current module 34 constitute the major part of described control core simultaneously.

Counting device 31 has counter; The electric current code of Din end gets into after the counting device 31; If the Enable Pin EN value of counting device 31 is 1, then the electric current code of Din end is directly given the Dout end and is kept, and this signal converts the operating current of direct drive laser LD into through bias current module 34.If Enable Pin EN value is 0, no longer receives the influence of temperature-electric current mapping block 37 after then the electric current code of Din end gets into counting device 31, but receive the influence of CMP end.

CMP end promptly transmits CMP value, and this CMP value has characterized the size of laser LD luminous power and the result of reference light performance number comparison, 1 represent less than, 0 represent greater than; The CMP value is to lean on following mechanism to realize: the light output of diode PD detection laser LD backlight; And obtain one with its light export electric current one to one; This electric current dividing potential drop on resistance R is passed through capacitor C filtering again and is promptly got more stable direct voltage, and this direct voltage inserts the negative terminal of comparator 32, compares with the reference voltage APCset of comparator 32 anodes; If represent then that greater than APCset laser LD luminous power surpasses reference value, the CMP value is 0; Less than then representing laser LD luminous power less than reference value, CMP is 1.

So when Enable Pin EN value was 0, counting device 31 adjustment was in real time finally worked under suitable current through bias current module 34 drive laser LD at first from the initial current code of Din:

When laser LD luminous power is above standard; Promptly use the final voltage that obtains that transforms of diode PD backlight to surpass reference voltage APCset; The CMP value is 0, passes through bias current module 34 drive laser LD after the counter in the counting device 31 successively decreases the electric current code again; Otherwise when laser LD luminous power is lower than standard, promptly use the final voltage that obtains that transforms of PD to be lower than reference voltage APCset, the CMP value is changed to 1, passes through bias current module 34 drive laser LD after the counter in the counting device 31 increases progressively the electric current code again; So cycle criterion, can know laser LD can be in a minimum scope steady operation, up to initiatively cancellation.By on can know that the optical power standard value of laser LD is exactly to be characterized by the APCset magnitude of voltage in fact.

In addition, whole device habitual function such as shared clock signal, reset terminal omit.

The above; Be merely preferred embodiment of the present invention, so can not limit the scope that the present invention implements according to this, the equivalence of promptly doing according to claim of the present invention and description changes and modifies; All should still belong in the scope that the present invention contains; Whether can only be limited to automated power set-up procedure or the like such as the comparison means of laser optical power and reference value, conventional miscellaneous function, the counter assignment of control core, not limit, the change of multiple details can be arranged; Although can do some conspicuous adjustment and improvement, still belong to the thinking of the present invention's protection generally.

Claims (10)

1. the automatic power control method of a laser, it is characterized in that: it may further comprise the steps:
1) fast initialization step; Give laser preset, an initial operating current according to ambient temperature value;
2) state switch step; After accomplishing above-mentioned steps, make said laser can get into following steps according to an enable signal:
A) initial maintenance step; Said laser is kept had initial said operating current;
B) automated power set-up procedure; Adjust the light power stabilising that said operating current makes said laser and work in a reference light performance number.
2. the automatic power control method of a kind of laser according to claim 1, it is characterized in that: said fast initialization step is utilized a temperature-electric current mapping table, makes said ambient temperature corresponding one by one with preset said operating current; The scope of said ambient temperature comprises the temperature range of laser operate as normal.
3. the automatic power control method of a kind of laser according to claim 2, it is characterized in that: said temperature-electric current mapping table comprises:
The element address has only one address designation, and this address designation adopts binary sequence coding; And
Location contents comprises preset said operating current, and this operating current adopts binary code to represent.
Wherein, all corresponding said address designation of each said ambient temperature.
4. the automatic power control method of a kind of laser according to claim 3; It is characterized in that: in the said automated power set-up procedure; The luminous power of said laser is by monitoring in real time; Use one to compare with a reference voltage with the positively related detection voltage of said laser optical power, its duty cycle comprises following two processes:
If said detection voltage is lower than said reference voltage, then promote said operating current; Be not less than said reference voltage until said detection voltage;
If said detection voltage is higher than said reference voltage, then reduce said operating current; Be not higher than said reference voltage until said detection voltage.
5. the automatic power control method of a kind of laser according to claim 4; It is characterized in that: in the said automated power set-up procedure; All utilize the form of binary arithmetic operation to the increase and decrease of said operating current, the binary result after the increase and decrease converts an analog quantity into again in order to drive said laser.
6. the automatic power control method of a kind of laser according to claim 5 is characterized in that: in the step of said automated power control, said operating current is provided with a upper limit and a lower limit; Judge all to before the increasing/subtract of said operating current whether it has reached the said upper limit/lower limit each time,, then stop said operating current is increased/reducing if reach the said upper limit/lower limit.
7. the automatic power-controlling device of a laser is characterized in that, it comprises:
One initialization module, this initialization module have a temperature sensor and an initial output; Directly export initial working current value according to ambient temperature value from said initial output;
One monitoring module, this monitoring module have a state justify end; And
One control core, this control core connects said initial output and state justify end; Also have an Enable Pin simultaneously and be connected the drive end of laser with one.
8. a kind of laser automatic power-controlling device according to claim 7 is characterized in that: in the middle of the said initialization module, have a temperature-electric current mapping block between said temperature sensor and the initial output.
9. a kind of laser automatic power-controlling device according to claim 8 is characterized in that: said monitoring module comprises a photoelectric tube and the sample resistance of connecting with this photoelectric tube; Other has a comparator, and its output is as said state justify end; Said comparator negative terminal connects the voltage sampling end of said sample resistance, positive reference voltage of termination.
10. a kind of laser automatic power-controlling device according to claim 9 is characterized in that:
Said initialization module comprises said temperature sensor, temperature A/D converter and the said temperature-electric current mapping block of cascade, and said initial output is positioned at said temperature-electric current mapping block;
Said control core comprises the counting device and the bias current module that contain counter; Said counting device has a data output end and is connected with said bias current module; Said initial output is positioned at said bias current module.
CN2011101059687A 2011-04-26 2011-04-26 Automatic power control method and device of laser CN102761053A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104682191A (en) * 2015-03-25 2015-06-03 江苏奥雷光电有限公司 Driving method for laser device in optical module and laser driving circuit
CN105182105A (en) * 2015-07-27 2015-12-23 电子科技大学 Automatic testing device for electric control characteristic of microannulus chip
CN105591694A (en) * 2015-12-29 2016-05-18 青岛海信宽带多媒体技术有限公司 Optical module
CN107910742A (en) * 2017-11-22 2018-04-13 青岛海信宽带多媒体技术有限公司 Optical module optical power adjustment method and device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003065620A1 (en) * 2002-01-30 2003-08-07 Huawei Technologies Co., Ltd. Optical transmission module with digital adjustment and the adjusting method
CN101218720A (en) * 2005-07-11 2008-07-09 松下电器产业株式会社 Light source, light source device, laser image forming device and integrated circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003065620A1 (en) * 2002-01-30 2003-08-07 Huawei Technologies Co., Ltd. Optical transmission module with digital adjustment and the adjusting method
CN101218720A (en) * 2005-07-11 2008-07-09 松下电器产业株式会社 Light source, light source device, laser image forming device and integrated circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104682191A (en) * 2015-03-25 2015-06-03 江苏奥雷光电有限公司 Driving method for laser device in optical module and laser driving circuit
CN104682191B (en) * 2015-03-25 2018-05-04 江苏奥雷光电有限公司 The driving method and laser drive circuit of laser in a kind of optical module
CN105182105A (en) * 2015-07-27 2015-12-23 电子科技大学 Automatic testing device for electric control characteristic of microannulus chip
CN105591694A (en) * 2015-12-29 2016-05-18 青岛海信宽带多媒体技术有限公司 Optical module
CN107910742A (en) * 2017-11-22 2018-04-13 青岛海信宽带多媒体技术有限公司 Optical module optical power adjustment method and device
CN107910742B (en) * 2017-11-22 2020-04-07 青岛海信宽带多媒体技术有限公司 Optical power adjusting method and device for optical module

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Application publication date: 20121031