CN201674503U - Optical module for long-distance transmission - Google Patents
Optical module for long-distance transmission Download PDFInfo
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- CN201674503U CN201674503U CN2010201804159U CN201020180415U CN201674503U CN 201674503 U CN201674503 U CN 201674503U CN 2010201804159 U CN2010201804159 U CN 2010201804159U CN 201020180415 U CN201020180415 U CN 201020180415U CN 201674503 U CN201674503 U CN 201674503U
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Abstract
The utility model discloses an optical module for long-distance transmission, which comprises an emitting optical assembly and a receiving optical assembly, wherein the emitting optical assembly adopts a DFB laser of a globe lens, the signal input end of the emitting optical module is connected to the modulation signal output end of an emitting driving circuit through a coupling circuit, and electric signals to be emitted are coupled to the DFB laser adopting the globe lens through the coupling circuit after being processed by the emitting driving circuit. The optical module of the utility model has the advantages of low cost and strong transmission performance.
Description
Technical field
The utility model relates to the optical communication technique field, specifically, relates to a kind of optical module that is used for long Distance Transmission.
Background technology
Gigabit Ethernet is widely used in the optical communication field.When gigabit Ethernet was used between the server data passes and backbone network in a large number, the point-to-point transmission of using optical fiber to grow distance was a networking plan relatively more commonly used.Transmission applications distances more common in the gigabit Ethernet has 10km, 40km, 80km, 120km etc., wherein the transmission range right and wrong about 40km usually see a kind of.
Transmission range is long more, and the chromatic dispersion of light and decay are serious more, thereby has influence on the accuracy of transfer of data.The gigabit optical module that is used for 40km or above transmission range in the market all is the Distributed Feedback Laser that adopts non-globe lens.This class laser spectrum is extremely narrow, and luminous power is bigger, is convenient to long Distance Transmission.
But the Distributed Feedback Laser cost of non-globe lens is very high, and because the luminous power of its generation is bigger, easily produces reflection when transmitting in light path, thereby influences the transmission performance of light signal.Along with the extensive use of optical communication technique, adopt the optical module of this class laser can not satisfy the demand in market gradually.
Summary of the invention
The utility model provides the long Distance Transmission optical module that a kind of cost is low, transmission performance is strong at the cost height of the optical module existence of the non-globe lens Distributed Feedback Laser of available technology adopting, the problem and shortage a little less than the transmission performance.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of optical module that is used for long Distance Transmission, comprise the emission optical assembly and receive optical assembly, described emission optical assembly is for adopting the Distributed Feedback Laser of globe lens, its signal input part connects the modulation signal output of emission drive circuit through coupling circuit, the armed signal of telecommunication is coupled to the Distributed Feedback Laser of described employing globe lens again through described coupling circuit after the emission drive circuit is handled.
The optical module of said structure adopts the globe lens Distributed Feedback Laser as the emission optical assembly, and product cost is low, and since this laser self light gathering slightly a little less than, can suitably reduce the emission luminous power, thereby reduce reflection of light, improved the transmission performance of optical module.
Aforesaid optical module, for realizing signal modulation to laser, described coupling circuit comprises two coupling branch roads, is connected between the signal input part of the positively-modulated signal output part of described emission drive circuit and negatively-modulated signal output part and corresponding Distributed Feedback Laser thereof.
Aforesaid optical module, for shortening the time that modulation signal rises and descends, accelerate the signal modulating speed, every the coupling branch road has included coupling capacitance, one end of described coupling capacitance connects a modulation signal output of described emission drive circuit on the one hand, connects positive source by pull-up resistor on the other hand; The other end of described coupling capacitance connects a signal input part of the Distributed Feedback Laser of described employing globe lens on the one hand, on the other hand by impedance matching circuit ground connection.
Preferably, described impedance matching circuit is the circuit that electric capacity and resistance are in series.
Aforesaid optical module also comprises amplitude limiting amplifier circuit, and the electrical signal of described reception optical assembly connects the amplitude limit input of described amplitude limiting amplifier circuit.
Aforesaid optical module, described reception optical assembly is preferably the ROSA of PIN type or APD type.The overall optical module preferably adopts SFP structure or SFF structure to encapsulate.
Description of drawings
Fig. 1 is the theory diagram that is used for an embodiment of optical module of long Distance Transmission described in the utility model;
Fig. 2 is a circuit connection diagram of launching optical assembly and emission drive circuit among Fig. 1 embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Fig. 1 and Fig. 2 show the embodiment that the utility model is used for the optical module of long Distance Transmission.Wherein, Fig. 1 is the theory diagram of this embodiment, and Fig. 2 is a circuit connection diagram of launching optical assembly and emission drive circuit among this embodiment.
Shown in the block diagram of Fig. 1, the optical module of this embodiment comprises emission optical assembly 1 and receives optical assembly 2 that wherein, emission optical assembly 1 is for adopting the Distributed Feedback Laser of globe lens.The signal input part of emission optical assembly 1 connects the modulation signal output of emission drive circuit 4 through coupling circuit 3.The armed signal of telecommunication is coupled to emission optical assembly 1 through coupling circuit 3 after transferring to 4 processing of emission drive circuit from interface circuit 6 again
The optical module of said structure adopts the globe lens Distributed Feedback Laser as the emission optical assembly, and product cost is low, and since this laser self light gathering slightly a little less than, can suitably reduce the emission luminous power, thereby reduce reflection of light, improved the transmission performance of optical module.
In this embodiment, receive the ROSA that optical assembly 2 can be selected PIN type or APD type for use, and receive the amplitude limit input of the electrical signal connection amplitude limiting amplifier circuit 5 of optical assembly 2, and then by amplitude limiting amplifier circuit 5 connecting interface circuit 6.Reception optical assembly 3 transfers to interface circuit 6, and then exports in the post processing electric circuit module through interface circuit 6 after the light signal that receives is converted to the signal of telecommunication after the amplitude limiting amplifier circuit limit is put processing.
Emission optical assembly 1 among this embodiment and emission drive circuit 4 thereof can adopt circuit connection diagram shown in Figure 2, are specially:
The emission drive circuit adopts integrated chip U1 and peripheral circuit thereof to constitute, and integrated chip U1 is connected by coupling circuit with launching between the optical assembly TOSA1.Coupling circuit comprises two coupling branch roads, is connected between the signal input part 2 and 4 of the positively-modulated signal output part OUT+ of integrated chip U1 and negatively-modulated signal output part OUT-and corresponding TOSA.
The coupling branch road that is connected 2 of the signal input parts of the positively-modulated signal output part OUT+ of integrated chip U1 and TOSA includes coupling capacitance C17, the end of coupling capacitance C17 connects positively-modulated signal output part OUT+ on the one hand, connects positive source by pull-up resistor R9 on the other hand; The other end of coupling capacitance C17 connects the signal input part 2 of TOSA on the one hand, on the other hand the impedance matching circuit ground connection that is in series by capacitor C 13 and resistance R 14.
The coupling branch road that is connected 4 of the signal input parts of the negatively-modulated signal output part OUT-of integrated chip U1 and TOSA includes coupling capacitance C16, the end of coupling capacitance C16 connects negatively-modulated signal output part OUT-on the one hand, connects positive source by pull-up resistor R8 on the other hand; The other end of coupling capacitance C16 connects the signal input part 4 of TOSA on the one hand, on the other hand the impedance matching circuit ground connection that is in series by capacitor C 11 and resistance R 13.
The armed signal of telecommunication enters integrated chip U1 from the electric signal input end IN+ and the IN-of interface circuit 6 by integrated chip U1; Modulation signal after integrated chip U1 handles is from OUT+ and the OUT-output of U1, and the coupling circuit through said structure is coupled among the TOSA then, and converts corresponding light signal to through TOSA and send.
Adopt the coupled circuit configuration of electric capacity and pull-up resistor form, the impedance matching circuit structure that cooperates Reasonable Parameters, can make and launch drive circuit and the Distributed Feedback Laser TOSA matched well that adopts globe lens, and shorten the time that modulation signal rises and descends, accelerate the modulating speed of signal, thereby realize that normal light signal sends.
In this embodiment, described reception optical assembly is preferably the ROSA of PIN type or APD type.The overall optical module preferably adopts SFP structure or SFF structure to encapsulate.
Above embodiment only in order to the explanation the technical solution of the utility model, but not limits it; Although the utility model is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the utility model technical scheme required for protection.
Claims (7)
1. optical module that is used for long Distance Transmission, comprise the emission optical assembly and receive optical assembly, it is characterized in that, described emission optical assembly is for adopting the Distributed Feedback Laser of globe lens, its signal input part connects the modulation signal output of emission drive circuit through coupling circuit, the armed signal of telecommunication is coupled to the Distributed Feedback Laser of described employing globe lens again through described coupling circuit after the emission drive circuit is handled.
2. optical module according to claim 1, it is characterized in that, described coupling circuit comprises two coupling branch roads, is connected between the signal input part of the positively-modulated signal output part of described emission drive circuit and negatively-modulated signal output part and corresponding Distributed Feedback Laser thereof.
3. optical module according to claim 2, it is characterized in that, every the coupling branch road has included coupling capacitance, and an end of described coupling capacitance connects a modulation signal output of described emission drive circuit on the one hand, connects positive source by pull-up resistor on the other hand; The other end of described coupling capacitance connects a signal input part of the Distributed Feedback Laser of described employing globe lens on the one hand, on the other hand by impedance matching circuit ground connection.
4. optical module according to claim 3 is characterized in that, described impedance matching circuit is the circuit that electric capacity and resistance are in series.
5. according to each described optical module in the claim 1 to 4, it is characterized in that optical module also comprises amplitude limiting amplifier circuit, the electrical signal of described reception optical assembly connects the amplitude limit input of described amplitude limiting amplifier circuit.
6. optical module according to claim 5 is characterized in that, described reception optical assembly is the ROSA of PIN type or APD type.
7. optical module according to claim 6 is characterized in that, optical module adopts SFP structure or SFF structure to encapsulate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201804159U CN201674503U (en) | 2010-04-27 | 2010-04-27 | Optical module for long-distance transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201804159U CN201674503U (en) | 2010-04-27 | 2010-04-27 | Optical module for long-distance transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674503U true CN201674503U (en) | 2010-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201804159U Expired - Fee Related CN201674503U (en) | 2010-04-27 | 2010-04-27 | Optical module for long-distance transmission |
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| CN (1) | CN201674503U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594460A (en) * | 2012-02-24 | 2012-07-18 | 郭丰亮 | Deflection-type LED (light-emitting diode) optical communication transceiver |
-
2010
- 2010-04-27 CN CN2010201804159U patent/CN201674503U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594460A (en) * | 2012-02-24 | 2012-07-18 | 郭丰亮 | Deflection-type LED (light-emitting diode) optical communication transceiver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101215 Termination date: 20190427 |
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| CF01 | Termination of patent right due to non-payment of annual fee |