CN202172408U - Low cost SFP module with high-precision digital diagnosis function - Google Patents
Low cost SFP module with high-precision digital diagnosis function Download PDFInfo
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- CN202172408U CN202172408U CN2011202386287U CN201120238628U CN202172408U CN 202172408 U CN202172408 U CN 202172408U CN 2011202386287 U CN2011202386287 U CN 2011202386287U CN 201120238628 U CN201120238628 U CN 201120238628U CN 202172408 U CN202172408 U CN 202172408U
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Abstract
The utility model discloses a low cost SFP module with a high-precision digital diagnosis function, relating to the optical fiber communication technology field. The utility model aims to provide the low cost SFP module satisfying the digital diagnosis function specified in a SFF-8472. The technical main points of the utility model are that by employing a single chip integrated by a laser driving and limiting amplitude amplifier and cooperating with a controller unit, the high-precision digital diagnosis function is realized; by accessing a filter between a light receiving interface assembly and an amplitude limiting amplifier of the laser driving and limiting amplitude amplifier unit, the module sensitivity and signal quality are improved, and by employing a resistor adding manner on the pins of a digital potentiometer of the controller unit, a fault problem that electricity does not generate light is avoided happening. The low cost SFP module with the high-precision digital diagnosis function can be used in an LC single fiber bidirectional SFP module, a SC single fiber bidirectional SFP module and an LC double fiber SFP module.
Description
Technical field
The utility model relates to a kind of Fibre Optical Communication Technology, especially a kind of SFP module with the high accuracy number diagnostic function.
Background technology
Abbreviation is explained in the literary composition
The control of APC (Automatic Power Control) automated power
APD (Avalanche Photo Diode) avalanche photodide
BOSA (Bidirectional Optical Sub-Assembly) bidirectional interface assembly
DDM (Digital Diagnostic Monitor) digital diagnostic monitoring
LA (Limit Amplifier) limiting amplifier
LDD (Laser Diode Driver) laser diode drives
MSA (Multi-Source Agreement) multi-source agreement
PIN (Positive Intrinsic-Negative) PIN diode
ROSA (Receiver Optical Sub-Assembly) receiving interface of optical assembly
SFP (Small From-Factor Pluggable) SFP optical module
TIA (Trans-Impedance Amplifier) trans-impedance amplifier
TOSA (Transmitter Optical Sub-Assembly) light transmission interface assembly
SFP is a kind of small light module of supporting hot plug, and it meets polynary agreement (MSA) standard, generally adopts the LC interface, and the single fiber bi-directional module has two types of LC and SC.SFP speed generally can be widely used in the communications fields such as data, telecommunications up to 4.25G.
The SFP optical module than 1 * 9, the SFF optical module has the hot plug of support function; Easy to maintenance; And the GBIC optical module of the early stage hot plug of volume ratio is half as large; Can therefore be widely used in every profession and trades such as communication, monitoring, electric power in the optical module quantity of many one times of onesize device panel configuration, realize the conversion of the light signal and the signal of telecommunication.
Present SFP on the market generally adopts laser driving chip and amplitude limit to amplify the design that two master chips of integrated chip add microprocessor.Two-piece type structure general cost is higher, and owing to adopt microprocessor unit, needs software development, also needs the programming program code in the production, and these all can increase design and manufacturing cost, and the stability of the stability of software decision SFP module performance.In addition, existing SFP module also has following deficiency:
1. adopt the independently scheme of laser driving chip and limiting amplifier chip, integrated level is not high, and peripheral components is many, and the optical module cost is high;
2. adopt general microprocessor, ADC generally has only 8 ~ 10, and resolution is limited, and the numerical diagnostic precision and the scope of realization are lower;
3. generally adopt the mode of external digital regulation resistance or resistance, potentiometer, the adjustment that goes out optical parameter has increased material cost or the debugging difficulty and the consistency of optical module.
The utility model content
The utility model purpose of the utility model is: to the problem of above-mentioned existence, a kind of employing monolithic transceiver Laser Drive and amplitude limit amplification integrated chip is provided, has the low cost S FP of high accuracy number diagnostic function (the high accuracy number diagnostic function is designated hereinafter simply as DDM).
The technical scheme that the utility model adopts is such:
A kind of SFP module of low-cost band high accuracy number diagnostic function; Comprise controller unit, electric interface unit, Laser Drive and limiting amplifier unit, light transmission interface assembly and receiving interface of optical assembly, electric interface unit is used to realize the signal transmission of controller unit, Laser Drive and limiting amplifier unit and external circuit; The laser driver of Laser Drive and limiting amplifier unit partly is used for receiving the signal of telecommunication to be sent that transmits from external circuit through electric interface unit, and the laser that drives light transmission interface assembly is luminous, realizes the conversion of the signal of telecommunication to light signal; The receiving interface of optical assembly is used for converting the light signal that receives to the signal of telecommunication; Export to the limiting amplifier part of Laser Drive and limiting amplifier unit; The signal of telecommunication that limiting amplifier amplifies back output is transferred to external circuit through electric interface unit; The laser driver part also is used to monitor the back facet current of light transmission interface assembly, and light transmission interface assembly is carried out automated power control, realizes the stable of transmitting optical power; Controller unit and limiting amplifier are partly monitored the received optical power of receiving interface of optical assembly, and when received optical power during less than certain threshold value, the limiting amplifier part is exported receiving optical signals to controller circuitry and external circuit and lost index signal.
Preferably, the laser driver part also has the automated power control unit, turn-offs signal input end, fault indication signal output; Said automated power control unit is used for gathering the current signal of light transmission interface assembly PIN photodiode, and to light transmission interface assembly output offset electric current; Turn-offing signal input end is connected with electric interface unit; The laser driver part also is used for monitoring the operating state of light transmission interface assembly laser; When said laser and laser driver partly occur when unusual; Laser driver partly sends fault indication signal, and said fault indication signal output is connected to electric interface unit and controller unit;
Said controller unit comprises an AD sample circuit, the 2nd AD sample circuit; The one AD sample circuit is used to gather the optical power signals that of laser driver output; The 2nd AD sample circuit is used to gather the bias current of laser driver output;
Said controller unit also is used to be provided with automated power Control current and modulated current size.
Preferably, limiting amplifier partly has light signal lossing signal output, and said light signal lossing signal output is connected to electric interface unit and controller unit.
Preferably, said controller unit also comprises first digital regulation resistance and second digital regulation resistance; First digital regulation resistance is used to be provided with automated power Control current size; Second digital regulation resistance is used to be provided with the modulated current size.
Preferably, a parallelly connected resistance respectively on first digital regulation resistance and second digital regulation resistance.
Preferably, said receiving interface of optical assembly is the receiving interface of optical components in the light transmitting-receiving interface module; Light transmission interface assembly is the light transmission interface components in the light transmitting-receiving interface module.
Preferably; Said receiving interface of optical assembly is the PIN type; Said controller unit also has the 3rd AD sample circuit, output of receiving interface of optical assembly and the proportional image current of received optical power, and the 3rd AD Acquisition Circuit of controller unit is used to gather said image current.
Preferably, be connected to 2 rank Bessel filters between the limiting amplifier of receiving interface of optical assembly and Laser Drive and the limiting amplifier unit part.
Preferably; Also has the APD high-voltage control circuit; Said controller unit also has the 3rd AD sample circuit and DA transducer, and said receiving interface of optical assembly is the APD type, output of receiving interface of optical assembly and the proportional image current of received optical power; The 3rd AD sample circuit of controller unit is used to gather said image current, and the DA transducer of controller unit is used for to APD high-voltage control circuit output control signal.
Preferably, be connected to 2 rank Bessel filters between the limiting amplifier of receiving interface of optical assembly and Laser Drive and the limiting amplifier unit part.
In sum, owing to adopted technique scheme, the beneficial effect of the utility model is:
1. adopt the integrated laser device to drive and limiting amplifier chip Mindspeed M02095/02096, effectively reduced peripheral components, reduced the optical module production cost;
2. adopt DS1856 as controller unit; Be integrated with the digital regulation resistance of 12 ADC, two 256 step-lengths on it; Laser Drive and limiting amplifier chip Mindspeed M02095/02096 have the automated power control unit and turn-off signal input end; Controller cooperates with the limiting amplifier chip with Laser Drive, has realized high accuracy DDM function;
3. thereby that has avoided the built-in digital regulation resistance of controller unit control laser goes out luminous power and extinction ratio parameter; At powered on moment; The digital regulation resistance resistance is greater than 1 megaohm, and laser driver is under abnormal operating state, the present invention respectively on these two digital regulation resistances resistance of each parallel connection to ground; The resistance value that goes out luminous power and extinction ratio parameter at powered on moment control laser can not be greater than 1 megaohm just like this, thereby can not get into malfunction and not luminous;
4. the present invention has added one 2 rank Bezier low pass filter between the LA of the limiting amplifier part of the TIA of receiving interface of optical assembly and Laser Drive and limiting amplifier unit; The have an appointment improvement of 1 ~ 3dB of the receiving sensitivity of SFP optical module; And electric eye figure improves significantly; Change under the little situation at cost, improved the transmission performance of optical module.
Description of drawings
Fig. 1 is the SFP modular structure sketch map of the utility model.
Fig. 2 is the structural representation of light transmitting section among Fig. 1.
Fig. 3 is the structural representation that light is accepted part among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Like Fig. 1, the disclosed SFP optical module of the utility model comprises 20 pin golden finger electric interface units, controller unit, Laser Drive and limiting amplifier unit, light transmission interface assembly, the receiving interface of optical assembly that satisfies MSA (polynary agreement) normalized definition.
The utility model adopts the DS1856 chip to constitute controller unit, selects for use Mindspeed M02095/02096 chip to constitute Laser Drive and limiting amplifier unit.
Controller unit realizes meeting the numerical diagnostic function (DDM) of MSA agreement in order to realize control and the monitoring to Laser Drive and limiting amplifier unit, and controller unit externally provides the I2C interface of standard to communicate by letter with external circuit; Laser driver partly receives from the next high-speed electrical signals of external circuit; The laser that drives light transmission interface assembly is luminous, realizes the conversion of the signal of telecommunication to light signal, and keeps watch on the back facet current of optical transmission module interface module; Carry out the control of APC automated power, realize the stable of transmitting optical power; PIN in the receiving interface of optical assembly or APD photodiode convert the light signal that receives to high-speed electrical signals; Amplify to the limiting amplifier part through trans-impedance amplifier (TIA) in the receiving interface of optical assembly; Limiting amplifier amplifies the signal of telecommunication of the standard of back output, gives external circuit through 20 pin golden finger electrical interfaces.
Adopt when the receiving interface of optical assembly under the situation of APD photodiode device, the SFP module also comprises the APD high-voltage control circuit, the required puncture high pressure of APD high-voltage control circuit output APD photodiode, the sensitivity that improves the receiving interface of optical assembly.Because the characteristic of APD optical device is along with temperature change, the utility model carries out temperature-compensating with thermistor to high pressure on APD high voltage control unit.
As shown in Figure 2 is the structural representation of light transmitting section in the utility model.The high-speed electrical signals of coming from external circuit enters into the Laser Drive part from 20 pin golden finger electrical interfaces; Laser driver (LDD) drive laser is luminous; And monitor the current signal of PIN photodiode backlight, send the power stability of light signal through the automated power control unit control in the Laser Drive part.When laser diode was luminous, PIN photodiode backlight produced the Ipd electric current with the proportional relation of output light intensity.Set automated power Control current Iapc through the digital regulation resistance Rapc resistance value that controller circuitry is set, the automated power control unit compares Ipd and automated power Control current Iapc.As Iapc>during Ipd, expression laser diode Output optical power is less than setting power, and the automated power control unit will increase the Output optical power of laser diode through increasing bias current Ibias; < during Ipd, expression laser diode Output optical power is greater than setting power, and the automated power control unit will be through reducing the Output optical power that bias current Ibias reduces laser diode as Iapc.Thereby final Iapc equates to realize the stable control to Output optical power with Imd.
The ratio of average light power p1 when average light power p0 was with " 1 " when extinction ratio was defined as signal " 0 ", under the certain situation of luminous power, the size of extinction ratio becomes certain relation with the size of modulated current Imod.The resistance of another digital regulation resistance Rmod in the adjustment controller unit is provided with the size of modulated current Imod, thereby the size of extinction ratio is set.
Inner integrated two digital regulation resistances of controller; Be used for being Rapc and Rmod respectively, 256 step-lengths respectively arranged, external equipment; Like external circuit; Through I2C interface operation controller relevant register, the resistance of digital regulation resistance can accurately be set, thereby realize the accurate control of laser luminous power and extinction ratio.Avoided the complicated hand debugging process of production line.
Controller unit inside is integrated with 12 high-precision adc circuits; Can monitor the laser that laser driver partly exports and go out optical power signals and bias current, controller unit is also monitored luminous fault indication signal (fault indication signal is produced by the safety circuit of the Laser Drive part chip internal state according to laser and interlock circuit) simultaneously.
Laser Drive partly has the shutoff signal input end, turn-offs signal input end and is connected to electric interface unit, and external circuit is luminous still not luminous through turn-offing signal input end control laser.When fault appears in the laser drive part branch, will give external circuit through 20 pin golden finger electric interface unit output laser fault indication signals.
What the utility model adopted the built-in digital regulation resistance control laser of controller goes out luminous power and extinction ratio parameter; But because the digital regulation resistance in this controller is at powered on moment; The digital regulation resistance resistance is greater than 1 megaohm; Can laser driver is under abnormal operating state like this, the safety circuit of internal drive will be exported fault indication signal, and turn-off the output of laser.Cause optical module not luminous for fear of powered on moment owing to the reason of digital regulation resistance; The utility model respectively on these two digital regulation resistances resistance of each parallel connection to ground; The resistance value that goes out luminous power and extinction ratio parameter at powered on moment control laser can not be greater than 1 megaohm just like this, thereby can not get into malfunction and not luminous.
As shown in Figure 2 is the structural representation of light receiving part in the utility model.For signal receiving end, the utlity model has PINTIA and APDTIA dual mode.When adopting the PINTIA mode; PIN photodiode converts the light signal that receives to the signal of telecommunication and gives trans-impedance amplifier (TIA); Trans-impedance amplifier (TIA) output high-speed electrical signals is given limiting amplifier (LA), and the signal of telecommunication of limiting amplifier (LA) outputting standard is given external circuit.
Under the APDTIA situation, need the APD high-voltage control circuit to offer the required puncture high pressure of APD, other operation principle is basic identical with PINTIA.The circuit that the utility model adopts is supported the receiving interface of optical assembly (ROSA) of Vpd and Isource dual mode; The ROSA of Vpd mode; Need to adopt independent mirror current source to be used to monitor the size of received optical power; And the ROSA of Isource, self is used for the received power monitoring with regard to the outgoing mirror image current.The image current of the operating current proportion relation of mirror current source output and PIN or APD, the proportional relation of this electric current and received optical power.The size of the image current of the mirror current source output of ADC monitoring PIN or the APD of controller unit through 12 is monitored the size of received optical power.
When controller unit finds that the received optical power size is lower than threshold value, the limiting amplifier part will be exported the light signal lossing signal and give external circuit and controller.External circuit can be visited received optical power and receiving optical signals state through the I2C interface.
In order to improve the reception quality of signals, the utility model has added one 2 rank Bezier low pass filter between trans-impedance amplifier (TIA) and limiting amplifier (LA), and to different received speed, the filter circuit parameter is selected different.Through simulation calculation and experiment, increase filter after, the have an appointment improvement of 1 ~ 3dB of the receiving sensitivity of the SFP optical module of the utility model, and electric eye figure improves significantly, and changes under the little situation at cost, improved the transmission performance of optical module.
The controller inside that the utility model adopts also is integrated with temperature sensor and electric voltage observation circuit, through inner 12 ADC, realizes the monitoring of high-precision temperature and operating voltage.
The circuit framework of the controller that the utility model adopts; Realized the precise monitoring of analog quantitys such as working temperature, operating voltage, received optical power, transmitting optical power, bias current; Also realize simultaneously the supervision and the control of states such as laser failure, Received Loss Of Signal; Externally provide the I2C interface of standard to be used for visit and the control of external circuit, satisfy the SFF-8472 requirement optical module.
When adopting BOSA, (replace TOSA and ROSA), this programme is also supported the SFP module of single fiber bi-directional, according to the interface of BOSA, can be divided into LC single fiber bi-directional SFP module and SC single fiber bi-directional SFP module again.The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. the SFP module of a low-cost band high accuracy number diagnostic function; Comprise controller unit, electric interface unit, Laser Drive and limiting amplifier unit, light transmission interface assembly and receiving interface of optical assembly, electric interface unit is used to realize the signal transmission of controller unit, Laser Drive and limiting amplifier unit and external circuit; The laser driver of Laser Drive and limiting amplifier unit partly is used for receiving the signal of telecommunication to be sent that transmits from external circuit through electric interface unit, and the laser that drives light transmission interface assembly is luminous, realizes the conversion of the signal of telecommunication to light signal; The receiving interface of optical assembly is used for converting the light signal that receives to the signal of telecommunication; Export to the limiting amplifier part of Laser Drive and limiting amplifier unit; The signal of telecommunication that limiting amplifier amplifies back output is transferred to external circuit through electric interface unit, it is characterized in that, the laser driver part also is used to monitor the back facet current of light transmission interface assembly; Light transmission interface assembly is carried out automated power control, realize the stable of transmitting optical power; Controller unit and limiting amplifier are partly monitored the received optical power of receiving interface of optical assembly, and when received optical power during less than certain threshold value, the limiting amplifier part is exported receiving optical signals to controller circuitry and external circuit and lost index signal.
2. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 1 is characterized in that, the laser driver part also has the automated power control unit, turn-offs signal input end, fault indication signal output; Said automated power control unit is used for gathering the current signal of light transmission interface assembly PIN photodiode, and to light transmission interface assembly output offset electric current; Turn-offing signal input end is connected with electric interface unit; The laser driver part also is used for monitoring the operating state of light transmission interface assembly laser; When said laser and laser driver partly occur when unusual; Laser driver partly sends fault indication signal, and said fault indication signal output is connected to electric interface unit and controller unit;
Said controller unit comprises an AD sample circuit, the 2nd AD sample circuit; The one AD sample circuit is used to gather the optical power signals that of laser driver output; The 2nd AD sample circuit is used to gather the bias current of laser driver output;
Said controller unit also is used to be provided with automated power Control current and modulated current size.
3. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 1 and 2; It is characterized in that; Limiting amplifier partly has light signal lossing signal output, and said light signal lossing signal output is connected to electric interface unit and controller unit.
4. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 2 is characterized in that said controller unit also comprises first digital regulation resistance and second digital regulation resistance; First digital regulation resistance is used to be provided with automated power Control current size; Second digital regulation resistance is used to be provided with the modulated current size.
5. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 4 is characterized in that, on first digital regulation resistance and second digital regulation resistance, distinguishes a parallelly connected resistance.
6. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 4 is characterized in that, said receiving interface of optical assembly is the receiving interface of optical components in the light transmitting-receiving interface module; Light transmission interface assembly is the light transmission interface components in the light transmitting-receiving interface module.
7. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 6; It is characterized in that; Said receiving interface of optical assembly is the PIN type; Said controller unit also has the 3rd AD sample circuit, output of receiving interface of optical assembly and the proportional image current of received optical power, and the 3rd AD Acquisition Circuit of controller unit is used to gather said image current.
8. according to claim 1 or 6 or 7 described a kind of low-cost SFP modules of being with the high accuracy number diagnostic functions; It is characterized in that, be connected to 2 rank Bessel filters between the limiting amplifier part of receiving interface of optical assembly and Laser Drive and limiting amplifier unit.
9. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 6; It is characterized in that; Also has the APD high-voltage control circuit; Said controller unit also has the 3rd AD sample circuit and DA transducer, and said receiving interface of optical assembly is the APD type, output of receiving interface of optical assembly and the proportional image current of received optical power; The 3rd AD sample circuit of controller unit is used to gather said image current, and the DA transducer of controller unit is used for to APD high-voltage control circuit output control signal.
10. the SFP module of a kind of low-cost band high accuracy number diagnostic function according to claim 9 is characterized in that, is connected to 2 rank Bessel filters between the limiting amplifier part of receiving interface of optical assembly and Laser Drive and limiting amplifier unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202386287U CN202172408U (en) | 2011-07-08 | 2011-07-08 | Low cost SFP module with high-precision digital diagnosis function |
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| CN2011202386287U CN202172408U (en) | 2011-07-08 | 2011-07-08 | Low cost SFP module with high-precision digital diagnosis function |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299746A (en) * | 2011-07-08 | 2011-12-28 | 成都新易盛通信技术有限公司 | Small from-factor pluggable (SFP) module with low costs and high precision digit diagnosis function |
| CN104052548A (en) * | 2014-06-20 | 2014-09-17 | 武汉鑫森华科技产业发展有限公司 | Small pluggable optical module used for electrical equipment communication |
| CN106253990A (en) * | 2016-09-05 | 2016-12-21 | 飞昂通讯科技南通有限公司 | A kind of high-speed low-power-consumption light transceiving chip |
| CN107579781A (en) * | 2017-10-18 | 2018-01-12 | 成都优博创通信技术股份有限公司 | Optical signal receiving module and optica signal receivingl transmitting apparatus |
| CN109495182A (en) * | 2018-10-16 | 2019-03-19 | 武汉光迅科技股份有限公司 | A kind of the receiving end calibrating method and device of relevant optical module |
| CN111835429A (en) * | 2020-08-04 | 2020-10-27 | 国家电网有限公司信息通信分公司 | Optical module, method for correcting transmitting optical power of optical module and controller |
| CN114070393A (en) * | 2020-08-04 | 2022-02-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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2011
- 2011-07-08 CN CN2011202386287U patent/CN202172408U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299746A (en) * | 2011-07-08 | 2011-12-28 | 成都新易盛通信技术有限公司 | Small from-factor pluggable (SFP) module with low costs and high precision digit diagnosis function |
| CN104052548A (en) * | 2014-06-20 | 2014-09-17 | 武汉鑫森华科技产业发展有限公司 | Small pluggable optical module used for electrical equipment communication |
| CN106253990A (en) * | 2016-09-05 | 2016-12-21 | 飞昂通讯科技南通有限公司 | A kind of high-speed low-power-consumption light transceiving chip |
| CN107579781A (en) * | 2017-10-18 | 2018-01-12 | 成都优博创通信技术股份有限公司 | Optical signal receiving module and optica signal receivingl transmitting apparatus |
| CN107579781B (en) * | 2017-10-18 | 2024-04-12 | 成都优博创通信技术股份有限公司 | Optical signal receiving module and optical signal transmitting/receiving device |
| CN109495182A (en) * | 2018-10-16 | 2019-03-19 | 武汉光迅科技股份有限公司 | A kind of the receiving end calibrating method and device of relevant optical module |
| CN109495182B (en) * | 2018-10-16 | 2020-07-31 | 武汉光迅科技股份有限公司 | Receiving end calibration method and device of coherent optical module |
| CN111835429A (en) * | 2020-08-04 | 2020-10-27 | 国家电网有限公司信息通信分公司 | Optical module, method for correcting transmitting optical power of optical module and controller |
| CN111835429B (en) * | 2020-08-04 | 2021-11-09 | 国家电网有限公司信息通信分公司 | Optical module, method for correcting transmitting optical power of optical module and controller |
| CN114070393A (en) * | 2020-08-04 | 2022-02-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN114070393B (en) * | 2020-08-04 | 2023-02-17 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHENGDU EOPTOLINK TECHNOLOGY, INC. Free format text: FORMER NAME: CHENGDU EOPTOLINK TECHNOLOGY INC., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Hite Industrial Park No. 21 High-tech Zone Gaopeng road in Chengdu city of Sichuan province 610041 No. 2 Building 5 floor Patentee after: Eoptolink Technology Inc., Ltd. Address before: 610031 Sichuan province Chengdu city Chengdu high tech Zone Gaopeng Road No. 21, Industrial Park No. 2 Building 5 floor Patentee before: Eoptolink Technology Inc. |
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| CX01 | Expiry of patent term |
Granted publication date: 20120321 |
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| CX01 | Expiry of patent term |