CN1832650B - System for adjusting light source characteristics by applying cuttable resistor and adjusting method thereof - Google Patents

Abstract

The invention discloses a system for adjusting the light output power to be constant and simultaneously achieving the qualified extinction ratio and an adjusting method thereof, wherein the system is used for adjusting an automatic power control loop by cutting a proper resistance value on a driving circuit board by using a laser cutting resistance technology. Because the cuttable resistor is welded together with other components by using the surface patch technology, the complex production and manufacturing process can be saved, the stability of the product can be improved, and the production cost can be further saved.

Description

System and adjustment method for adjusting light source characteristics using cuttable resistance

technical field

The present invention relates to a system for adjusting the characteristics of the light source of an optical transceiver, in particular to a cutting-type resistor that can be cut dynamically and in real time by means of laser cutting to adjust the optical transceiver. A system and an adjustment method for light source characteristics such as light output power and extinction ratio.

Background technique

Due to some components that need to use a light source to emit light, such as: the light source contained in the Optical Transceiver (such as: Laser Diode (LD), Vertical Cavity Surface Emitter Laser; VCSEL)) will produce different optical characteristics under different ambient temperatures; even under long-term use, its optical characteristics will also decline due to aging. Therefore, in the driver used to drive this type of light source, it is often necessary to have a mechanism that can adjust the optical output power of the light source, which is generally called an Automatic Power Control (APC) circuit. By adjusting the light output power of the light source through the automatic power control circuit, and then connecting a control resistor with an appropriate resistance value, the light source characteristics of the light source such as the average launched light output power (Mean Launched Power) and the extinction ratio (Extinction Ratio) can be stabilized. It is very important to apply such a technology in the transmitting end circuit of the optical transceiver.

The above technical content is further described as follows: please refer to FIG. 1, an optical transceiver 1 includes a light source 10 electrically connected to a driver 12, and an automatic power control circuit (not shown) is built in the driver 12, for example : the driver of Mindspeed 2068, Maxim 3646 model commonly used in this field, etc., meanwhile, the driver 12 is electrically connected to a first control resistor 13 and a second control resistor 14, and one end of the driver 12 is electrically connected to a power supply terminal 18 , to provide an appropriate power supply for the system; in order to achieve the above-mentioned purpose, the practice in the prior art is to obtain the corresponding current of the real-time output optical power of the light source 10 from the driver 12, and form a voltage drop through the first control resistor 13, After using the automatic power control loop feedback, by adjusting the resistance value of the first control resistor 13, the corresponding current of the output optical power of the automatic power control loop is properly adjusted, that is, the output optical power of the light source 10 can be adjusted relative to the ambient temperature. The generated variation reaches the minimum value, and even the output light power can be made constant, so that the average emitted light output power of the light source 10 is stabilized; in addition, by changing the resistance value of the second control resistor 14, the automatic power control loop can be made The current output to the light source 10 can be modulated to achieve a better extinction ratio of the light source; it can be seen that the change of the resistance value of the first control resistor 13 and the second control resistor 14 can be adjusted with the automatic power control circuit. Light source characteristics such as average emitted light output power and extinction ratio.

Even so, there are still many ways in the prior art for the implementation of such a technology, for example as follows: the first way is to use the first control resistor 13 and the second control resistor 14 of the variable resistance type, which can directly Use a screwdriver to adjust the knob on the variable resistor, and when the adjustment is completed, fix the knob with glue, but this method is very labor-intensive, so the cost cannot be reduced; the second method uses an additional external resistor to match the automatic power Adjust the control loop, find out the appropriate resistance value and then weld it with a control resistor with an appropriate resistance value. This method can not save the complicated manufacturing steps; the third is to use EEPROM with temperature sensing control function as the control Resistor, after calculating the characteristic curve of the light source, the EEPROM can provide the corresponding resistance value for the light source application through the conversion circuit, but such a structure and manufacturing process are also complicated, and the cost is not easy to reduce; the fourth way is The EEPROM with digital resistance function is used as the control resistance, and with the corresponding software, when the adjustment is completed, the appropriate resistance value can be written into the EEPROM to achieve the same purpose. In this way, the component cost is still not easy to reduce; the above-mentioned way In addition to the difficulty in reducing the cost of components, there is also a general disadvantage that it is difficult to introduce automated production, which makes it relatively difficult to reduce the manufacturing cost, so there is indeed room for improvement.

Contents of the invention

The present invention provides a system and an adjustment method for adjusting the characteristics of a light source using a cuttable resistor. Since a laser cutting machine can be directly driven by combining an external control modulator, the cutting can be performed in real time after adjusting an automatic power control loop in the driver. Cutting resistors can achieve the purpose of adjusting the light output power of the light source, and have the advantages of easy automation and low cost.

According to the above idea, the present invention provides a system for adjusting the characteristics of a light source using a cuttable resistor, the system includes: a light source; a driver for driving the light source to emit light, wherein the driver includes an automatic power control circuit; and a first A cuttable resistor is electrically connected to the driver, and the first cutable resistor is dynamically and real-time cut to an appropriate resistance value by means of laser cutting, so that the automatic power control loop in the driver is relatively changed, so that the driver The light output power output to the light source remains constant, or varies less than 1dB at different temperatures.

According to the above idea, the system further includes a second cuttable resistor electrically connected to the driver.

According to the idea above, the system further includes: a laser cutting machine electrically connected to the driver for receiving instructions from the driver to perform laser cutting operations.

According to the above idea, the present invention provides an adjustment method for adjusting the characteristics of a light source using a cuttable resistor, wherein the method includes the following steps: providing a system, including a light source and a driver, and the driver includes an automatic power control loop; A plurality of components of the driver and a first cuttable resistor are welded to a substrate; a laser cutting machine is electrically connected to the automatic power control circuit of the substrate; when the resistance value of the first cutable resistor changes , the automatic power control loop in the driver will change relatively, while adjusting the automatic power control loop, the automatic power control loop will generate an instruction to drive the laser cutting machine to cut the first cuttable resistor Operation, so that the light output power output by the driver to the light source remains constant, or the variation is less than 1dB at different temperatures; and when the adjustment of the automatic power control loop is completed, the automatic power control loop will generate an instruction to stop The operation of the laser cutting machine.

According to the above idea, when the plurality of components and the first cuttable resistor are welded to the substrate at the same time, a second cuttable resistor is also welded to another position of the substrate at the same time.

According to the above idea, while adjusting the automatic power control loop, the automatic power control loop will generate an instruction to drive the laser cutting machine to perform cutting operations on the first cuttable resistor and the second cuttable resistor respectively.

According to the above idea, the system is applied in an optical transceiver (Optical Transceiver).

According to the above idea, the light source is a laser diode (Laser Diode; LD) or a vertical cavity surface emitting diode (Vertical Cavity Surface Emitter Laser; VCSEL).

According to the above idea, the cuttable resistor can change its resistance value after being cut by a laser, wherein the laser is Nd-YAG Laser.

According to the above idea, the cuttable resistor is a surface mount type (Surface Mound Device; SMD) cuttable resistor.

According to the above idea, when the resistance value of the first cuttable resistor changes, the automatic power control loop in the driver will change relatively, so that the light output power output from the driver to the light source remains constant, and the light output from the driver to the light source can also be kept constant. The variation of power at different temperatures is less than 1dB; and when the resistance value of the second cuttable resistor changes, the automatic power control loop in the driver will change relatively, thereby controlling the current output from the driver to the light source.

According to the above idea, when the resistance value of the second cuttable resistor changes, the automatic power control loop in the driver will change relatively, so that the light output power output from the driver to the light source remains constant, and the light output from the driver to the light source can also be kept constant. The variation of power at different temperatures is less than 1dB; and when the resistance value of the first cuttable resistor changes, the automatic power control loop in the driver will change relatively, thereby controlling the current output from the driver to the light source.

Description of drawings

FIG. 1 is a schematic functional block diagram of a system for adjusting optical output power using a control resistor in the prior art.

FIG. 2 is a schematic functional block diagram of a system for adjusting characteristics of a light source using a cuttable resistor according to the present invention.

3A to 3D are schematic diagrams of cutting methods of the cuttable resistors described in the present invention.

FIG. 4 is a schematic block diagram of the flow of the adjustment method for adjusting the characteristics of the light source using a cuttable resistor according to the present invention.

Description of reference symbols

1 optical transceiver 10 light source

12 Driver 13 First control resistor

14 Second control resistor 18 Power terminal

2 optical transceivers 20 light sources

22 Driver 23 First Cuttable Resistor

231 Cutting line 232 Cutting line

233 cutting line 234 cutting line

24 Second Cuttable Resistor 26 Laser Cutting Machine

28 Power terminal 41～45 steps

Detailed ways

Embodiment of the present invention please refer to shown in Fig. 2 first, basically, the assembly and its relative position used in the optical transceiver 2 are roughly similar to the prior art, but the present invention especially uses a first cutable resistor 23 to replace The first control resistor 13, and a second cuttable resistor 24 can also be used to replace the second control resistor 14, and is electrically connected to two corresponding positions of the driver 22, wherein the driver 22 also has the same The same automatic power control (Automatic Power Control; APC) loop in the driver 12, the driver 22 can be, for example, a component model Mindspeed 2068, MAXIM 3646 commonly used in the art or other components with similar functions, and the light source 20 is also Electrically connected to the driver 22, wherein the light source 20 can be a laser diode (Laser Diode; LD) or a vertical cavity surface emitting diode (VerticalCavity Surface Emitter Laser; VCSEL), etc., and one end of the driver 22 is electrically connected to a power supply terminal 28, to provide the power energy required by the overall system.

On the other hand, when adjusting the automatic power control loop, a laser cutter 26 is electrically connected to one end of the driver 22. The laser cutter 26 can provide the function of laser cutting and cutting resistance. At the same time, the laser cutter 26 has The function that allows the designer to set the laser cutting program by himself, the user can set the laser cutting machine 26 by himself, so that it can accept the instruction of the automatic power control circuit in the driver 22, so that the driving laser cutting machine 26 can be synchronized for the cutting type When the automatic power control loop adjustment is completed, the laser cutting machine 26 will stop the cutting operation at the same time. Preferably, the laser can be a Nd-YAG Laser or the like.

The control method applied by the present invention is as follows, please refer to Fig. 2 and Fig. 4 at the same time, wherein Fig. 4 is a block diagram of the process of implementing the present invention; The cutting resistor 23 and the second cutting resistor 24 are placed on a substrate (not shown in the figure), as in step 41, preferably these components can be combined with the first cutting resistor 23 and the second cutting resistor 24 At the same time, it is designed as a Surface Mound Device (SMD), so that automatic equipment can be used to weld its components to the preset position of the substrate during manufacturing, which improves the efficiency and success rate of manufacturing; next, a laser One end of the cutting machine 26 is electrically connected to the substrate, that is, it is connected to the automatic power control circuit in the driver 22, as in step 42; next, an instruction can be generated by adjusting the automatic power control circuit in the driver 22 to drive synchronously The laser cutting machine sequentially performs cutting operations on the first cuttable resistor 23 and the second cuttable resistor 24, such as step 43, wherein the first cuttable resistor 23 or the second cuttable resistor 24 is cut by the laser While cutting, its resistance value will continue to increase. Through the feedback of the automatic power control loop, the corresponding current of the real-time output optical power of the driver 22 and its corresponding extinction ratio can be obtained; next, it is judged whether the automatic power control loop is Well adjusted? As in step 44, wherein the judging mechanism can be determined by the designer, if the adjustment has not been completed, then return to step 43 to continue the adjustment; finally, when it is confirmed that the adjustment is completed, the automatic power control loop in the adjustment driver 22 also generates a command to make the laser cutting machine 26 stop the laser cutting operation, as in step 45, the laser cutting machine 26 can be removed after completion, so that the automatic adjustment of the appropriate optical characteristics required by the optical transceiver 2 can be completed. Certainly.

In the above-mentioned technology, when the laser cutting machine is used to cut the cuttable resistor, if the one shown in FIG. The current transmission capability of the cutting resistor 23 decreases, that is, its resistance value will increase compared with that before cutting. Similarly, a plurality of cutting lines 231, 232 can also be cut on the first cutable resistor 23, as shown in the figure As shown in 3B, or cut into a plurality of cutting lines 231, 233, as shown in Figure 3C, the resistance value of the first cuttable resistor 23 can also be increased during the process of adjusting the automatic power control loop, or as shown in Figure 3D As shown, cutting the cutting line 234 on the first cuttable resistor 23 with a laser can also achieve the same purpose.

It can be seen from the above description that the embodiment of the present invention uses a cuttable resistor to adjust the optical output power of the driver. The cuttable resistor can be soldered to the substrate together with other components in advance, and finally adjusted to an appropriate resistance value. , so that complicated manufacturing steps can be omitted, thereby saving costs. At the same time, the technology of the present invention can use the laser cutting machine to directly receive the instructions of the automatic power control loop in the driver 22 to directly control the resistance value of the cuttable resistor. It is easier to achieve automation, and the cost can be further reduced. It can be seen that the technology of the present invention does have industrial application value.

The above descriptions are only preferred embodiments of the present invention, and the above embodiments are only used to illustrate rather than limit the scope of the claims of the present invention, and the scope of protection of the present invention is defined by the claims of the present invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (16)

1. but use the system that cutting type resistance is adjusted light source characteristic for one kind, this system comprises:

One light source;

One driver, in order to drive this light source luminescent, wherein this driver comprises an automatic power control circuit; And

But one first cutting type resistance is electrically connected on this driver,

But this first cutting type resistance comes dynamic real-time to cut out suitable resistance value by the mode of laser cutting, automatic power control circuit in the driver is changed relatively, keep constant so that driver exports the optical output power of light source to, or the amount of variability under different temperature is less than 1dB.

2. but application cutting type resistance as claimed in claim 1 is adjusted the system of light source characteristic, but this automatic power control circuit in this driver is changed relatively, and then control the size of current that this driver exports this light source to.

3. but application cutting type resistance as claimed in claim 1 is adjusted the system of light source characteristic, but wherein this system also comprises one second cutting type resistance, is electrically connected on this driver.

4. but application cutting type resistance as claimed in claim 3 is adjusted the system of light source characteristic, but this automatic power control circuit in this driver is changed relatively, the optical output power that makes this driver export this light source to keeps constant, or the amount of variability under different temperature is less than 1dB; But and this automatic power control circuit in this driver is changed relatively during the resistance change of this second cutting type resistance, and then control the size of current that this driver exports this light source to.

5. but application cutting type resistance as claimed in claim 1 is adjusted the system of light source characteristic, and wherein said light source is laser diode or vertical cavity surface-emitting type diode, and this system applies is among an optical transceiver.

6. but application cutting type resistance as claimed in claim 3 is adjusted the system of light source characteristic, changes its resistance value but the wherein said first or second cutting type resistance can cut the back by a laser, and wherein said laser is the inferior lattice laser of neodymium.

7. but application cutting type resistance as claimed in claim 3 is adjusted the system of light source characteristic, but but the wherein said first or second cutting type resistance is respectively the cutting type resistance of a SMD LED surface-mount device LED.

8. but application cutting type resistance as claimed in claim 1 is adjusted the system of light source characteristic, and wherein this system also comprises: a laser cutting machine, be electrically connected to this driver, and operate so that carry out laser cutting in order to the instruction that receives this driver.

9. but use the method for adjustment that cutting type resistance is adjusted light source characteristic for one kind, wherein this method comprises the following step:

One system is provided, comprises a light source and a driver, comprise an automatic power control circuit in this driver;

But on a plurality of assemblies and one first cutting type resistance welded to a substrate with this driver;

One laser cutting machine is electrically connected on this automatic power control circuit of this substrate; But when the resistance change of this first cutting type resistance, this automatic power control circuit in this driver is changed relatively, when adjusting this automatic power control circuit, this automatic power control circuit can produce an instruction, but drive this laser cutting machine and carry out cutting operation for this first cutting type resistance, the optical output power that makes this driver export this light source to keeps constant, or the amount of variability under different temperature is less than 1dB; And

Finish when adjusting this automatic power control circuit, this automatic power control circuit can produce an instruction, stops the operation of this laser cutting machine.

10. but application cutting type resistance as claimed in claim 9 is adjusted the method for adjustment of light source characteristic, but this automatic power control circuit in this driver is changed relatively, and then control the size of current that this driver exports this light source to.

11. but application cutting type resistance as claimed in claim 9 is adjusted the method for adjustment of light source characteristic, wherein also comprise a step, but with one second cutting type resistance welded to the another location of this substrate.

But 12. application cutting type resistance as claimed in claim 11 is adjusted the method for adjustment of light source characteristic, but this automatic power control circuit in this driver is changed relatively, the optical output power that makes this driver export this light source to keeps constant, or the amount of variability under different temperature is less than 1dB; But and this automatic power control circuit in this driver is changed relatively during the resistance change of this second cutting type resistance, and then control the size of current that this driver exports this light source to.

But 13. application cutting type resistance as claimed in claim 11 is adjusted the method for adjustment of light source characteristic, when wherein adjusting this automatic power control circuit, this automatic power control circuit can produce an instruction, but but drives this laser cutting machine and carry out cutting operation respectively for this first cutting type resistance and the second cutting type resistance.

14. but application cutting type resistance as claimed in claim 11 is adjusted the method for adjustment of light source characteristic, but cutting the back by a laser respectively, the wherein said first or second cutting type resistance changes its resistance value, and wherein said laser is the inferior lattice laser of neodymium.

But 15. application cutting type resistance as claimed in claim 11 is adjusted the method for adjustment of light source characteristic, but but the wherein said first or second cutting type resistance is respectively the cutting type resistance of a SMD LED surface-mount device LED.

But 16. application cutting type resistance as claimed in claim 9 is adjusted the method for adjustment of light source characteristic, wherein said light source is laser diode or vertical cavity surface-emitting type diode, and this method is applied among the optical transceiver.

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