CN202373844U - VCSEL (Vertical Cavity Surface Emitting Laser) drive circuit for plastic optical fiber transmission module - Google Patents
VCSEL (Vertical Cavity Surface Emitting Laser) drive circuit for plastic optical fiber transmission module Download PDFInfo
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- CN202373844U CN202373844U CN2011205369705U CN201120536970U CN202373844U CN 202373844 U CN202373844 U CN 202373844U CN 2011205369705 U CN2011205369705 U CN 2011205369705U CN 201120536970 U CN201120536970 U CN 201120536970U CN 202373844 U CN202373844 U CN 202373844U
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Abstract
The utility model discloses a VCSEL (Vertical Cavity Surface Emitting Laser) drive circuit for a plastic optical fiber transmission module. The VCSEL laser comprises a laser diode and a backlight diode, wherein a drive circuit is arranged between a drive chip and the VCSEL laser; a decoupling capacitor C18 and a resistor R18 are connected between a pin OUTN of the drive chip and a pin LD+ of the laser diode in series; a decoupling capacitor C21 and a resistor R27 are connected between a pin OUTP of the drive chip and a pin LD- of the laser diode in series; both ends of the pin LD+ of the laser diode and both ends of the pin LD- of the laser diode are connected with a resistor R20 in parallel; a pin PD+ of the backlight diode is connected with an inductor L8 in series, and then is connected to a pin IPIN of the drive chip; and the pin LD+ of the laser diode is connected with a terminal SVCC. By adopting the VCSEL laser drive circuit for the plastic optical fiber transmission module, provided by the utility model, the VCSEL laser can be driven by the drive chip at lower cost, so that the total cost of the plastic optical fiber transmission module is reduced, and the VCSEL laser drive circuit has good economic benefit.
Description
Technical field
The utility model belongs to communication technical field, is specifically related to a kind of planar laser with vertical cavity drive circuit that is applied to the plastic fiber transport module.
Background technology
At present, the optical fiber that communications optical cable is used all is to adopt silica fiber, by high-purity silicon dioxide SiO basically
2Add that an amount of dopant forms, the characteristics of its traditional fiber are that the cost cost is high, and loss is low, can grow the transmission of distance.But because people are to short distance, intensive wiring, from Fiber to the home, the demand of fiber to the desk constantly strengthens, and it is low that traditional silica fiber can not satisfy its cost, the characteristic that flexibility is good, this moment, plastic fiber also just arose at the historic moment.Plastic fiber (Plastic Optical Fiber, abbreviation POF), it is the optical fiber of processing with a kind of light penetrating copolymer.Because can utilize the ripe simple drawing process of polymer, so cost is lower, softness, firm, I&M is convenient, can be in a large number as in short-range transmission system.
Along with the information age development of Communication Technique, the application of plastic fiber must present a kind of development of blowout formula, no matter is that Fiber to the home; Or be applied in consumer electronics, home networking, automobile; Aircraft, the information transmission in the vehicles such as train can be used plastic fiber.
Plastic fiber is because material problem own causes the through-put power decay big, through the about average out to 80dB/KM of test attenuation rate.In addition, therefore relatively responsive because plastic fiber is mainly used in the terminal use for cost, so need a kind of low-cost laser to be used as transmitting terminal.From DFB (Distribute Feedback); FP (Febry-peront), VCSEL (Vertical Cavitv Surface-Emitting Laer) laser, the VCSEL laser has higher coupling efficiency; Size is little; Higher switching speed, characteristics such as low cost can effectively reduce the manufacturing cost of product.
In the technology of traditional driving VCSEL laser; What adopt is special-purpose VCSEL laser driving chip (MAX3735), and the biasing and the modulated current that reduce flowing through laser through the built-in chip type circuit function reach the purpose that drives VCSEL laser operate as normal.Utilize chip itself to regulate electric current, need to adopt special-purpose VCSEL laser driving chip, this causes the module cost to rise.
The utility model content
The technical problem that the utility model will solve provides a kind of VCSEL drive circuit for laser that is applied to the plastic fiber transport module, to solve the high problem of cost because of using special-purpose VCSEL laser driving chip to cause.
For solving the problems of the technologies described above, the technical scheme that the utility model is taked is: a kind of VCSEL drive circuit for laser that is applied to the plastic fiber transport module is provided, and said VCSEL laser comprises laser diode and diode backlight; It is characterized in that: said drive circuit is arranged between chip for driving and the VCSEL laser; Connect between the OUTN pin of said chip for driving and the LD+ pin of laser diode decoupling capacitor C18 and resistance R 18; Connect between the OUTP pin of said chip for driving and the LD-pin of laser diode decoupling capacitor C21 and resistance R 27; The LD+ pin of said laser diode and LD-pin two ends parallel resistance R20; Insert the IPIN pin of chip for driving behind the PD+ pin series inductance L8 of said diode backlight; The LD+ pin of said laser diode is connected with the SVCC end; Be provided with between the LD+ pin of said SVCC end and laser diode by the parallelly connected current branch of resistance R 14 and inductance L 6.
The drive current range of said chip for driving output is 1mA ~ 99mA.Said chip for driving is Fabry-Paro laser driving chip or distributed feedback laser chip for driving.Insert the IBOUT pin of chip for driving behind the LD-pin series inductance L7 of said laser diode.Said resistance R 14, resistance 18, resistance R 20 and resistance R 27 are adjustable resistance.
The modulation electric of chip for driving output fails to be convened for lack of a quorum and gets into the VCSEL laser again through overdrive circuit earlier; Because drive circuit is shunted the electric current of chip for driving output; Make the electric current that gets into the VCSEL laser be reduced in the working range, guarantee the normal operation of VCSEL laser.The diode backlight that the VCSEL laser is inner can be monitored the optical output power of VCSEL laser, and power output is fed back to chip for driving, and when optical output power descended, drive current is increase thereupon just; When optical output power increased, drive current just descended thereupon, made laser keep constant optical output power all the time.The VCSEL drive circuit for laser that is applied to the plastic fiber transport module that adopts the utility model to provide; Just do not need the high special-purpose VCSEL laser driving chip of cost to drive the VCSEL laser; But substitute with lower-cost other chip for driving; Thereby reduced plastic fiber transport module total cost, had good economic benefits.
Description of drawings
Fig. 1 is the simplified electrical circuit diagram that is applied to the VCSEL drive circuit for laser of plastic fiber transport module.
Fig. 2 is the circuit theory diagrams of plastic fiber transport module.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is carried out detailed description.
As shown in Figure 1, the VCSEL drive circuit for laser that is applied to the plastic fiber transport module is arranged between chip for driving and the VCSEL laser.The VCSEL laser comprises laser diode and diode backlight; Drive circuit is arranged between chip for driving and the VCSEL laser; Connect between the OUTN pin of chip for driving and the LD+ pin of laser diode decoupling capacitor C18 and resistance R 18; Connect between the OUTP pin of chip for driving and the LD-pin of laser diode decoupling capacitor C21 and resistance R 27; The LD+ pin of laser diode and LD-pin two ends parallel resistance R20; Insert the IPIN pin of chip for driving behind the PD+ pin series inductance L8 of diode backlight; The LD+ pin of laser diode is connected with the SVCC end; Be provided with between the LD+ pin of SVCC end and laser diode by the parallelly connected current branch of resistance R 14 and inductance L 6.Insert the IBOUT pin of chip for driving behind the LD-pin series inductance L7 of laser diode.
The drive current range of chip for driving output is 1mA ~ 99mA.Chip for driving is Fabry-Paro laser driving chip or distributed feedback laser chip for driving.Resistance R 14, resistance 18, resistance R 20 and resistance R 27 are adjustable resistance.
Chip for driving is exported the signal of telecommunication after modulating from OUTN pin and OUTP pin; Modulated current is provided for the VCSEL laser; Pass through decoupling capacitor C18, decoupling capacitor C21, resistance R 18, resistance R 27 respectively; Be added in the LD+ and the LD-two ends of laser diode, the SVCC end provides a driving voltage through the current branch (but the authenticity of inhibit signal is filtered low frequency signal) by resistance R 14 and inductance L 6 parallel connections to the VCSEL laser.Insert the IBOUT pin of chip for driving behind the LD-pin series inductance L7 of laser diode, to bias current of VCSEL laser output, the acting in conjunction through above-mentioned two electric currents just can drive the VCSEL laser works.It should be noted that bias current must be greater than the threshold current of VCSEL laser itself, the VCSEL laser just can operate as normal.When bias current greater than the threshold current of VCSEL laser itself, chip for driving provides modulated current for the VCSEL laser again, makes the luminous power of VCSEL laser best, to satisfy communicating requirement.
As shown in Figure 2; Two-way both-end differential signal TX+, TX-get into chip for driving through two capacitor C 22 and C20 AC coupled respectively; Chip for driving is handled modulation signal, by the OUTN pin and the output of OUTP pin of chip for driving, gets into the VCSEL laser through overdrive circuit again.The IPIN pin of access chip for driving behind the PD+ pin series inductance L8 of the diode backlight that the VCSEL laser is inner, the luminous power of feedback VCSEL laser is given chip for driving, comes luminous power stable and adjusting VCSEL laser.
Two resistance R mod and the Rapc that connects MODSET pin and the APCSET pin of chip for driving is used for regulating the size of the bias current and the adjusting electric current of chip for driving output respectively.
Claims (5)
1. VCSEL drive circuit for laser that is applied to the plastic fiber transport module, said VCSEL laser comprises laser diode and diode backlight; It is characterized in that: said drive circuit is arranged between chip for driving and the VCSEL laser; Connect between the OUTN pin of said chip for driving and the LD+ pin of laser diode decoupling capacitor C18 and resistance R 18; Connect between the OUTP pin of said chip for driving and the LD-pin of laser diode decoupling capacitor C21 and resistance R 27; The LD+ pin of said laser diode and LD-pin two ends parallel resistance R20; Insert the IPIN pin of chip for driving behind the PD+ pin series inductance L8 of said diode backlight; The LD+ pin of said laser diode is connected with the SVCC end; Be provided with between the LD+ pin of said SVCC end and laser diode by the parallelly connected current branch of resistance R 14 and inductance L 6.
2. the VCSEL drive circuit for laser that is applied to the plastic fiber transport module according to claim 1 is characterized in that: the drive current range of said chip for driving output is 1mA ~ 99mA.
3. the VCSEL drive circuit for laser that is applied to the plastic fiber transport module according to claim 1 and 2 is characterized in that: said chip for driving is Fabry-Paro laser driving chip or distributed feedback laser chip for driving.
4. the VCSEL drive circuit for laser that is applied to the plastic fiber transport module according to claim 1 is characterized in that: the IBOUT pin that inserts chip for driving behind the LD-pin series inductance L7 of said laser diode.
5. the VCSEL drive circuit for laser that is applied to the plastic fiber transport module according to claim 1 is characterized in that: said resistance R 14, resistance 18, resistance R 20 and resistance R 27 are adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205369705U CN202373844U (en) | 2011-12-20 | 2011-12-20 | VCSEL (Vertical Cavity Surface Emitting Laser) drive circuit for plastic optical fiber transmission module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205369705U CN202373844U (en) | 2011-12-20 | 2011-12-20 | VCSEL (Vertical Cavity Surface Emitting Laser) drive circuit for plastic optical fiber transmission module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202373844U true CN202373844U (en) | 2012-08-08 |
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ID=46597536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205369705U Expired - Fee Related CN202373844U (en) | 2011-12-20 | 2011-12-20 | VCSEL (Vertical Cavity Surface Emitting Laser) drive circuit for plastic optical fiber transmission module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202373844U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739031A (en) * | 2016-04-19 | 2016-07-06 | 武汉电信器件有限公司 | COB-based surface-mount laser diode interface matching apparatus |
-
2011
- 2011-12-20 CN CN2011205369705U patent/CN202373844U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739031A (en) * | 2016-04-19 | 2016-07-06 | 武汉电信器件有限公司 | COB-based surface-mount laser diode interface matching apparatus |
| CN105739031B (en) * | 2016-04-19 | 2017-11-03 | 武汉电信器件有限公司 | The laser diode Interface Matching device mounted based on COB |
| US10700488B2 (en) | 2016-04-19 | 2020-06-30 | Wuhan Telecommunication Devices Co., Ltd. | COB bonding laser diode interface mating device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140331 Granted publication date: 20120808 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150331 Granted publication date: 20120808 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20131220 |
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| EXPY | Termination of patent right or utility model |