CN101533990B - Method for manufacturing 1310/1550 laser having high stability and low return loss at working temperature - Google Patents
Method for manufacturing 1310/1550 laser having high stability and low return loss at working temperature Download PDFInfo
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- CN101533990B CN101533990B CN2009100616313A CN200910061631A CN101533990B CN 101533990 B CN101533990 B CN 101533990B CN 2009100616313 A CN2009100616313 A CN 2009100616313A CN 200910061631 A CN200910061631 A CN 200910061631A CN 101533990 B CN101533990 B CN 101533990B
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Abstract
The invention discloses a method for manufacturing 1310/1550 laser having high stability and low return loss at working temperature, belonging to the field of optical communication active devices. The technical proposal is as follows: firstly determining the light-emitting diode core wave length range of the corresponding laser at normal temperature; secondly, customizing an isolator for the light-emitting diode core wave length range of the corresponding laser at normal temperature, wherein corresponding wave length of peak value isolation of the isolator is 3-6 mum more than the actual measurement of the light-emitting diode core wave length range of the corresponding laser at normal temperature; thirdly, manufacturing a special tube for containing the tube core and a special contact pin bushing for containing the isolator and ladle needle inserting core; fourthly, correspondingly coupling the tube core and the isolator with the laser according to the peak value isolation of the isolator being 3-6 mum more than the tube core wave length of the laser at normal temperature; fifthly, welding to fix all the metal components of the laser and detecting the finished product.
Description
Technical field
The present invention relates to optical communication active device field, specifically produce a kind of effective ways that descend the low return loss laser of high stability in working order.
Background technology
Laser light source can adopt Fabry one by sieve laser (FP-LD), distributed feedback laser (DFB-LD) and other luminescent devices according to different application scenarios in the market, and wherein DFB-LD is highly suitable for long system of distance.In order to reduce the influence of light reflection to light signal generating, reduce the return loss value, what at present the traditional manufacture method of laser all adopted is: will send light the diode core of 1310/1550 standard ± 10nm wavelength and peak value isolation 1310/1550 ± 10nm wavelength isolator at random the proportioning wavelength be coupled and reach maximum Output optical power and produce laser.
Yet regrettably, there are a lot of drawbacks in this traditional processing technology and method, and its drawback is:
With regard to laser, the operating current and the working temperature of its operation wavelength and laser have confidential relation, and have following approximate formula:
df/dT≈10GHZ/℃(1)
df/dI≈1GHZ/mA(2)
Wherein f is the operating frequency of laser, and T is a die temperature, and I is a bias current.This shows that the operation wavelength of the tube core of laser is along with the variation of working temperature is drifted about.
Owing to use the radio frequency optical module of laser to be mounted in the optical fiber repeater, generally speaking, housing temperature can be than normal temperature height when optical module is in running order, when the operation wavelength of the tube core of laser is drifted about out isolator isolation acceptability limit along with the variation of working temperature, isolator does not just reach the catoptrical requirement of isolation at the isolation of laser tube core operation wavelength, the overall performance reduction that the return loss value rises and will cause optical module, even the paralysis of overall optical transmission system and collapse.For example: when laser diode tube core normal temperature wavelength is 1310nm+10nm, the isolator peak value isolation corresponding wavelength of random pair is 1310nm-10nm, this moment, laser and isolator may all be qualified products at normal temperatures, but in working order, the laser diode tube core just might drift arrive 1326nm, and isolator peak value isolation is also at the 1300nm place, isolation at the 1326nm place is likely the effective isolation radiative effect of not reaching, the laser that their pairing is produced the return loss value also just occurred and has risen, linear variation, flatness is not enough, serious jitter phenomenon, the lower curtate noise rises, and product is defective.
In sum, the laser that present existing mode is produced is because its drawback and limitation can't normally be used in the production of radio frequency optical module in the 3G system, as mandatory use, the consequence of bringing has under hot environment often that the active device about 50% occurs that return loss reduces, serious jitter phenomenon, lower curtate noise rise and cause the flatness of whole system and linearity not to satisfy the demands.
Summary of the invention
The objective of the invention is to solve the drawback of prior art, a kind of operating period acceptance rate that increases considerably the 1310/1550nm laser is proposed, reduce the return loss of 1310/1550nm in environment for use, increase the stability in use of 1310/1550 product, improve the index performance of 1310/1550nm laser, provide the manufacture method of new 1310/1550nm laser for adapting to whole 3G optical transmission system.
For realizing this purpose, the present invention adopts the corresponding laser diode normal temperature of the peak value isolation wavelength wavelength customization of the isolator core means as technological approaches, its concrete mode: at first the laser diode tube core is pursued with spectrometer in normal temperature environment and only authenticate its spectral characteristic, determine its normal temperature wave-length coverage; Second step: the normal temperature wavelength of corresponding laser diode tube core customizes isolator, as: the normal temperature wavelength of laser diode tube core is 1310nm, then to should upwards being offset 3-6nm by laser diode, the corresponding wavelength of the peak value isolation of isolator should be 1313-1316nm.The 3rd step: with the body and the contact pin cover that assemble isolator tail optical fiber of 304 stainless steels according to drawing making assembling tube core; The 4th step: with tube core and isolator according to isolator peak value isolation corresponding wavelength than the corresponding coupled laser of the big 3-6nm of laser tube core normal temperature wavelength; The 5th step: all metalworks of welding fixed laser, and detect finished product.
The present invention becomes the body of assembling tube core and the contact pin cover of assembling isolator and tail optical fiber with 304 stainless steels according to drawing making.304 stainless component content index requests: chromium 〉=19%, nickel 〉=9%, carbon content＜0.03% and have nonmagnetic: the body design must be considered to join for pine with the laser diode tube core; Join for pine between the palpus consideration of contact pin Analysis of Nested Design and isolator and the tail optical fiber; The present invention joins the laser diode pine that to put into body welding fixing, and uses the body after the coupling cramp lower chuck is clamped the assembling laser diode, then tail optical fiber is sandwiched the upper grip of coupling cramp, carries out being coupled to the first time maximum coupling efficiency; The isolator that corresponding laser diode upwards is offset 3-6nm is fixed into the contact pin cover with epoxide-resin glue and is inserted in tail optical fiber on the upper grip, carries out being coupled to the second time maximum coupling efficiency, and compresses with body on the lower chuck; The present invention puts into coupling cramp between laser point type bonding machine welding fixing plug pin cover and the tail optical fiber and between contact pin cover and the body; Record bright dipping luminous power, normal temperature return loss value, 80 celsius temperature return loss values, insertion loss after the last test, qualified products index standard value is: luminous power is not less than 3mw, and normal temperature return loss value is not higher than-45db, and 80 degrees centigrade of return loss values are not higher than-40db.
Isolator method for customizing of the present invention is as follows: under microscopy environment, a polarizer and Faraday polarization apparatus be closely linked form a double-layer structure, be fixed on the support, another polarizer is fixed in another support, the support of band polarizer and Faraday polarization apparatus and the support of band polarizer are positioned in the cylindrical magnet ring, a support is fixed in the magnet ring, another can smoothly rotate, determine input and output polarization state of light direction then, by the monitoring of collimater and spectrometer promote slidably support make its relative another fixed support smoothly rotate to an angle and carry out craft effect standard, the isolator spectrogram of spectrometer monitoring is along with the different peak value isolation of the angle that promotes move left and right, when monitor control index reaches peak value isolation corresponding wavelength when corresponding laser diode normal temperature wavelength upwards is offset in the wave-length coverage of 3-6nm, with the fixing slidably support of epoxide-resin glue, send the baking of progressively heating in the hot environment, reach best fastening shape to epoxide-resin glue, test mark incidence surface, exiting surface, and spectra re-recorded characteristic, the accurate value of maximum isolation degree wave length shift, insert loss, qualified isolator index standard value is that the peak value isolation is greater than 45dB, insert loss less than 0.25dB, wave-length coverage is the wave-length coverage that corresponding laser diode tube core normal temperature wavelength upwards is offset 3-6nm.Standby.
Compared with prior art, the present invention has the following advantages: utilized laser tube core to be subjected to variations in temperature and the characteristic of drifting about, change the method for customizing of isolator and the coupling technique of laser according to the spectral drift ratio that accurately calculates, laser is just in time dropped on after the wavelength drift under operational environment on the peak value isolation of isolator, isolate catoptrical effects of jamming fully thereby reach; The present invention also puts at design body and contact pin and has proposed material 304 stainless chromium 〉=19% that explicitly call for, nickel 〉=9%, carbon content＜0.03% and have nonmagnetic, carbonization when having solved the antioxidant anticorrosive of assembling supporting body and welding and cause the phenomenon of aging back optical power down has improved the stability of laser finished product; Necessary close-fitting when also having proposed design assembling laser body among the present invention, assembling process is a compression joint technique, improved the fastness of tube core assembling, ensured in the laser production process and the problem of the concentricity after producing, avoided owing to the problem of eccentric coupling less than the eccentric optical power down that produces of maximum luminous power and aging back.Process after the whole improvement is produced upward simple, rate of finished products is high, and it is extremely low to improve cost, has improved stability and the qualification rate of laser in 3G system optical transmission greatly, promoted the performance of overall optical transmission system, descended about 2 times than traditional mode of production pattern cost.Through the laser of output is according to the method tested, its index under operational environment reaches: the return loss value is not higher than-40db, and luminous power is not less than 3mw.Thereby the problem of shake makes the flatness of total system and the index that requires that linear index reaches the 3G system when having solved active device in the 3G optical communication system completely and particularly working under the hot environment under operational environment.
Concrete data related in description of the present invention, embodiment and the accompanying drawing are optimization scheme of the present invention, should be as the restriction to the inventive method protection.
Description of drawings
Fig. 1 is the spectral composition schematic diagram of laser luminous die;
Fig. 2 is the spectral composition schematic diagram of isolator peak value isolation degree test;
Fig. 3 looks the decomposition texture schematic diagram for the assembled shaft of the isolator of use this method manufacturing;
Fig. 4 is the used pipe structure schematic diagram of assembling laser tube core.；
In Fig. 1, arrow indication place reads the place for the laser tube wavelength.
In Fig. 2, arrow indication place is that the place is read in the monitoring of peak value isolation corresponding wavelength.
In Fig. 3, magnet ring-1, polarizer-2a, 2b, Faraday rotator-3, support-4a, 4b.
In Fig. 4, laser diode-5, body-6, contact pin cover-7, isolator-8, tail optical fiber-9.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments: at first the laser diode tube core is pursued with spectrometer in normal temperature environment and only authenticate its spectral characteristic, determine its normal temperature wave-length coverage (see figure 1); The second step corresponding laser diode ground normal temperature wavelength upwards is offset 3-6nm and customizes isolator, as: the normal temperature wavelength of laser diode tube core is 1310nm, and then the corresponding wavelength to the peak value isolation that should laser diode upwards be offset the isolator that 3-6nm customizes should be 1313-1316nm.Method for customizing following (seeing the assembly structure of Fig. 3 isolator): under microscopy environment, being closely linked forms a double-layer structure with a polarizer (2a among Fig. 3) and Faraday polarization apparatus (among Fig. 3 3), be fixed on the support (4a among Fig. 3), another polarizer (2b among Fig. 3) is fixed in another support (4b among Fig. 3), to be positioned over the support (4b among Fig. 3) of the support (4a among Fig. 3) of polarizer (2a among Fig. 3) and Faraday polarization apparatus (among Fig. 3 3) and band polarizer (among Fig. 3 4) in the magnet ring (among Fig. 3 1), a support is fixed in the magnet ring, another can smoothly rotate, determine input and output polarization state of light direction then, by the monitoring of collimater and spectrometer promote slidably support make its relative another fixed support smoothly rotate to an angle and carry out craft effect standard, the isolator spectrogram of spectrometer monitoring is along with the different peak value isolation of the angle that promotes move left and right, when monitor control index reaches peak value isolation corresponding wavelength when corresponding laser diode normal temperature wavelength upwards is offset in the wave-length coverage of 3-6nm, with the fixing slidably support of epoxide-resin glue, send the baking of progressively heating in the hot environment, reach best fastening shape to epoxide-resin glue, test mark incidence surface, exiting surface, and spectra re-recorded characteristic, the accurate value of maximum isolation degree wave length shift, insert loss, qualified isolator index standard value is that the peak value isolation is greater than 45dB, insert loss less than 0.25dB, wave-length coverage is the wave-length coverage that corresponding laser diode tube core normal temperature wavelength upwards is offset 3-6nm.Standby.The 3rd step: become the body (see figure 3) of assembling tube core and the contact pin cover of assembling isolator and tail optical fiber according to drawing making with 304 stainless steels.304 stainless component content index requests: chromium 〉=19%, nickel 〉=9%, carbon content＜0.03% and have nonmagnetic: the body design must be considered join (see figure 3) with the laser diode tube core for pine; Join (see figure 4) for pine between the palpus consideration of contact pin Analysis of Nested Design and isolator and the tail optical fiber; The 4th step laser diode (among Fig. 4 5) pine was joined that to put into body (Fig. 4 6) welding back fixing, and use body after the coupling cramp lower chuck is clamped the assembling laser diode (among Fig. 4 6), then tail optical fiber (among Fig. 4 9) is sandwiched the upper grip of coupling cramp, carry out being coupled to the first time maximum coupling efficiency; The customization isolator (among Fig. 4 8) that corresponding laser diode upwards is offset 3-6nm is fixed into the specific contact pin cover made with 304 stainless steels (among Fig. 4 7) with epoxide-resin glue and is inserted in tail optical fiber on the upper grip (among Fig. 4 9), carry out being coupled to the second time maximum coupling efficiency, and compress with body (among Fig. 4 6) on the lower chuck; The 5th step put into the laser all component on coupling cramp and the anchor clamps between laser point type bonding machine welding fixing plug pin cover (Fig. 4 7) and the tail optical fiber (Fig. 4 9) and between contact pin cover (Fig. 4 7) and the body (Fig. 4 6); Record bright dipping luminous power, normal temperature return loss value, 80 celsius temperature return loss values, insertion loss after the last test, qualified products index standard value is: luminous power is not less than 3mw, and normal temperature return loss value is not higher than-45db, and 80 degrees centigrade of return loss values are not higher than-40db.
Claims (2)
1. the method for the production 1310/1550nm laser of the low return loss of high stability under working temperature, the step of this method is as follows:
The first step is pursued with spectrometer in normal temperature environment the laser diode tube core and only to be authenticated its spectral characteristic, determines its normal temperature wave-length coverage;
Second step, the normal temperature wavelength customization isolator of corresponding laser diode tube core, the peak value isolation corresponding wavelength of isolator is that the normal temperature wavelength of the corresponding laser diode tube core of actual measurement upwards is offset 3-6nm;
The 3rd step is with the body and the contact pin cover that assemble isolator and tail optical fiber of 304 stainless steels according to drawing making assembling tube core;
The 4th step, the tube core pine joined to put into body welding back fixing, and use body after the coupling cramp lower chuck is clamped the assembling tube core, then tail optical fiber is sandwiched the upper grip of coupling cramp, carry out being coupled to the first time maximum coupling efficiency, again isolator is fixed into contact pin cover with epoxide-resin glue and is inserted in tail optical fiber on the upper grip, carry out being coupled to the second time maximum coupling efficiency, and compress with body on the lower chuck;
The 5th step, the laser all component on coupling cramp and the coupling cramp is put into laser point type bonding machine, welding between contact pin cover and the tail optical fiber is fixing and welding between contact pin cover and the body is fixing, and detect finished product.
2. method according to claim 1, wherein second step was in particular: under microscopy environment, a polarizer and Faraday polarization apparatus be closely linked form a double-layer structure, be fixed on the support, another polarizer is fixed in another support, to be positioned in the cylindrical magnet ring with the support of a polarizer and a Faraday polarization apparatus with the support of another polarizer, a support is fixed in the magnet ring, another support can smoothly rotate, determine input and output polarization state of light direction then, by the monitoring of collimater and spectrometer promote slidably support make its relative another fixed support smoothly rotate to an angle and carry out craft effect standard, the isolator spectrogram of spectrometer monitoring is along with the different peak value isolation of the angle that promotes move left and right, when monitor control index reaches peak value isolation corresponding wavelength when the normal temperature wavelength of corresponding laser diode tube core upwards is offset in the wave-length coverage of 3-6nm, with the fixing slidably support of epoxide-resin glue, send the baking of progressively heating in the hot environment, reach best fastening shape to epoxide-resin glue, test mark incidence surface, exiting surface, and spectra re-recorded characteristic, the accurate value of maximum isolation degree wave length shift, insert loss, qualified isolator index standard value is that the peak value isolation is greater than 45dB, insert loss less than 0.25dB, wave-length coverage is the wave-length coverage that the normal temperature wavelength of corresponding laser diode tube core upwards is offset 3-6nm.
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| CN2009100616313A CN101533990B (en) | 2009-04-17 | 2009-04-17 | Method for manufacturing 1310/1550 laser having high stability and low return loss at working temperature |
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| CN2009100616313A CN101533990B (en) | 2009-04-17 | 2009-04-17 | Method for manufacturing 1310/1550 laser having high stability and low return loss at working temperature |
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| CN101533990B true CN101533990B (en) | 2011-01-05 |
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Assignee: Shenzhen Carrier Communication Technology Co., Ltd. Assignor: WUHAN SMART-GRID NEW ENERGY TECH. CO., LTD. Contract record no.: 2011440020467 Denomination of invention: The production method of 1310/1550nm laser with high stability and low return loss of working temperature Granted publication date: 20110105 License type: Exclusive License Open date: 20090916 Record date: 20111212 |
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