CN101171537A - Interconnect mechanism for connecting a laser driver to a laser - Google Patents
Interconnect mechanism for connecting a laser driver to a laser Download PDFInfo
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- CN101171537A CN101171537A CNA2006800152703A CN200680015270A CN101171537A CN 101171537 A CN101171537 A CN 101171537A CN A2006800152703 A CNA2006800152703 A CN A2006800152703A CN 200680015270 A CN200680015270 A CN 200680015270A CN 101171537 A CN101171537 A CN 101171537A
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Abstract
A transmission mechanism for transmitting an electrical signal from the output stage of an electro-optic transducer driver to an electro-optic transducer. The transmission mechanism includes the electro-optic transducer, the electro-optic transducer driver and a termination resistor. A first node of the termination resistor is coupled to the first differential input terminal of the electro-optic transducer. A second node of the termination resistor is coupled to the first output node of the electro-optic transducer driver. In addition, a second differential input terminal of the electro-optic transducer is coupled to a second output node of the electro-optic transducer driver. Such connections provide for a first DC path from the first differential input terminal of the electro-optic transducer to the second electro-optic transducer driver output node and a second DC path from the first node of the termination resistor to first electro-optic transducer driver output node.
Description
Technical field
The present invention relates generally to optical sender.More specifically, the present invention relates to a kind of being used for is connected to interconnection device on the laser instrument with laser driver with high signal fidelity, low-voltage and power attenuation.
Technical background
Computer and network technologies have changed our world.Along with the increase of the quantity of network information communication, it is more important that high rate data transmission becomes.Many high speed data transmission networks depend on optical transceiver and similarly are easy to send and receive the equipment that forms the numerical data of performance with the light signal on the optical fiber.Therefore, it is a kind of extensive high-speed applications that optical-fiber network is construed to, little of Local Area Network, arrives Internet backbone greatly.
Typically, by as the optical sender (being also referred to as electro-optic transducer) of laser or light emitting diode (LED) network in realize data transmission.When electric current passed through, electro-optic transducer was luminous, and the light intensity that sends is the function of size of current.The electric current that electro-optic transducer driver produces suitable size produces light intensity with the corresponding appropriate amount of data that is transmitting to pass to electro-optic transducer.
In order to determine a binary value, lower electric current (is called " I here
BIAS") thereby by electro-optic transducer the light of lower-wattage level is transmitted on the optical fiber.For definite opposite binary value (oppositebinary value), thereby higher electric current makes the light of high power level (as I by light converter
BIASAdd maximum modulation current, be called " I here
MOD") be transmitted on the optical fiber.Therefore, by on bias current, adding modulating current (0 and " I
MOD" between change), can send correct bit sequence.
Fig. 1 shows driver-transducer (driver-transducer) circuit 100, and it comprises the electro-optic transducer 101 with the diode form of custom-made.Manufacture method at the electro-optic transducer 101 of present technique field diode form is known.The power of the light of electric light variator 101 emissions is with approximately proportional in the amount of current of interested frequency range (the frequency range of interest) by electro-optic transducer 101.
Fig. 1 also shows the driver output stage 110 of electrical to optical converter.The driver output stage 110 of electrical to optical converter applies suitable current according to data and passes electrical to optical converter 101.In the exemplary embodiment, electrical to optical converter 110 is for being known as " DC coupling " to electrical to optical converter 110.Note not illustrating among Fig. 1, but can between electro-optic transducer driver output stage 110 and transducer 101, use transmission structure, as transmission line.
Especially, bias current sources 111 is drawn (draws) bias current I by electro-optic transducer 101
BIASIn addition, modulation current source 112 perhaps obtains maximum modulation current I in fractionation mode (split manner) by bipolar transistor 121 and 122 by bipolar transistor 121 or by bipolar transistor 122
MODThe total amount of the modulating current that draws by electrical to optical converter 101 depend on the differential data signals DATA that is applied to respective bipolar transistor 121 and 122 base terminals and DATA!
The DC coupling circuit 100 of Fig. 1 all has superiority when drawing by electrical to optical converter 101 by bipolar transistor 122 when modulating current.In addition, bias current I
BIASApply bias voltage to electro-optic transducer 101 and driving output stage 110.Thereby circuit 100 is efficiently.
Yet usually, DC coupling uses single-ended strategy to drive electrical to optical converter 101.In other words, electrical to optical converter 101 must be connected to or the output terminal of transistor 121 or the output terminal connection of transistor 122, and can not connect the output terminal of the two simultaneously.For example, electro-optic transducer 101 is connected to transistor 122, and transistor 121 is by being used for the right terminating resistor of balance complementary transistor 105 terminations.Therefore, DC coupling circuit 100 does not utilize the symmetrical advantage that the complementary characteristic of transistor 121 and 122 produces fully.For example, in single-ended configuration, some speed that complementary pair 121 and 122 is had and the advantage of signal fidelity aspect can lose.
In addition, because DC coupling circuit 200 is single-ended, so in circuit loop, need very low (inductance ground) inductively.This is because all circuit turn back to ground by a transistor in these transistors, rather than turns back to ground by two transistors in the difference channel.For example, bias source 111 place's electric current return path ground connection.Yet, in optical transmission circuit, be difficult to produce Low ESR ground.
Fig. 2 shows another legacy drive-converter circuitry 200.In this circuit, the modulating current of electro-optic transducer driver output stage 210 is ac-coupled to electro-optic transducer 201.Bias current sources 211 provides bias current sources IBIAS to add IMOD/2 by electro-optic transducer 201.Modulation current source 212 makes modulating current pass through electro-optic transducer 201 by ac coupling capacitor device 225A and 225B.
Especially, modulation current source draws maximum modulation current I in the mode that splits by bipolar transistor 221 and 222
MOD1/n doubly (here, " n " is AC coupling coefficient).By pull-up resistor 223 and by the magnitude of current that bipolar transistor 221 draws depend on data-signal DATA and DATA! Because the electric current total amount perseverance of drawing from bipolar transistor 221 and 222 is I
MOD/ n, therefore, the magnitude of current that draws by source pull-up resistor 224 and bipolar transistor 222 also depend on DATA and DATA!
According to data-signal DATA, can be by the magnitude of current that bipolar transistor 222 draws from 0 to I
MOD/ n changes.Conversely, the electric current that draws by bipolar transistor 221 also can be with the mode of the electric current complementation of drawing by bipolar transistor 222 from 0 to I
MOD/ n changes., last difference current is by transmitting device 205 AC coupling.For example difference current is by electric capacity 225A and 225B, (each all has resistance R by corresponding transmission line 226A and 227B with by corresponding loading resistor 227A and 227B
L) exchange coupling, thus the fraction that equals by the AC coupling coefficient " n " of the difference current of bipolar transistor 222 and 221 only provided by electro-optic transducer 201.Therefore, according to data-signal DATA, the modulating current that provides by electro-optic transducer 301 from 0 to I
MODChange.
The advantage of AC coupling driver-transducer current 200 of Fig. 2 is that circuit is at the compensation characteristic that has made full use of transistor 221 and 222 aspect speed and the signal fidelity.Yet AC coupling driver-converter circuitry 200 has very big shortcoming really.In ac driver-converter circuitry 200, driver current output stage 210 must be drawn more modulating current than the driver current output stage 110 of DC coupling driver-converter circuitry 100 among Fig. 1.For example, the modulating current that draws in the driver current 210 is I
MOD/ n, wherein, " n " (coupling coefficient) in order to reach performance the best, is desirably about 50% less than 1.In addition, coupling capacitance 225A and 225B make driver output stage 210 and transducer 201 must use bias current respectively, thereby cause using power efficiency low.
As other shortcoming,,, the existence of pull- up resistor 223 and 224 must use higher service voltage so meaning drive circuit 210 because pull-up resistor may cause bigger pressure drop.The drive circuit 210 of DC-coupled configuration can be worked under 3.3 volts, yet the drive circuit 310 of AC-coupled configuration can use 5 volts service voltage.
Summary of the invention
Embodiment disclosed by the invention relates to a kind of being used for from the output stage of the electro-optic transducer driver transmitting device to the electro-optic transducer transmission of electric signals.This transmitting device comprises: electro-optic transducer, electro-optic transducer driver and terminating resistor.
Electro-optic transducer can be laser instrument or LED, and it comprises first and second differential input ends.When work, first differential input end is configured to be coupled with voltage source.Electro-optic transducer driver comprises first output node and second output node.Terminating resistor also has first node and Section Point.
First differential input end coupling of the first node of terminating resistor and electro-optic transducer.First output node coupling of the Section Point of terminating resistor and electro-optic transducer driver.In addition, second output node of second differential input end of electro-optic transducer and electro-optic transducer driver coupling.Such connection provides first DC path and second DC path from the first node of terminating resistor to the first electro-optic transducer driver output node from first differential input end of electro-optic transducer to the second electro-optic transducer driver output node.
Content part of the present invention will the deeply selection of the notion of description in embodiment with a kind of form introduction of simplification.Content part of the present invention is not intended to limit the key feature or the essential feature of claimed object, also is not intended to be used for limiting the scope of claimed object.
Other feature and advantage will propose in the following embodiments, wherein can be partly apparent from instructions, and perhaps by concrete enforcement embodiment acquisition disclosed herein.The feature and advantage of embodiment disclosed herein can realize and acquisition by device and the combination that particularly points out in appended claims.By following instructions and appended claims, the present invention these and further feature will become clear more fully, perhaps can understand these and further feature of the present invention by following illustrated enforcement of the present invention.
Description of drawings
In order further to illustrate above and other advantage of the present invention and feature, will carry out more concrete description for the present invention by the embodiment shown in the reference in the accompanying drawings.Should be appreciated that these accompanying drawings have only been described exemplary embodiment of the present invention and therefore should do not thought its scope that limited.By using accompanying drawing, can describe and explain the present invention by supplementary features and details.In the accompanying drawings:
Fig. 1 shows wherein, and electro-optic transducer driver and electro-optic transducer are the circuit diagrams of the legacy drive-converter circuitry of DC coupling;
Fig. 2 shows wherein, and electro-optic transducer driver and electric light driver are the circuit diagrams of the legacy drive-converter circuitry of AC coupling;
Fig. 3 shows the circuit diagram that contains the optical transmission circuit of transmitting device according to embodiment of the present invention;
Fig. 4 shows the circuit diagram according to the DC coupling transmitting device of embodiment of the present invention; And
Fig. 5 shows the circuit diagram according to the AC coupling transmitting device of embodiment of the present invention.
Embodiment
Embodiment disclosed by the invention relates to a kind of optical transmission circuit, comprises: driver output stage, electro-optic transducer and be used for transmitting to electro-optic transducer from driving stage the transmission mechanism/interconnect stage of electric signal.The termination (termination) that transmission mechanism/interconnect stage can use the single-termination resistor to provide as transmission line structure.Therefore, utilize less voltage to supply with driving circuit and save available voltage space (voltageheadroom).In addition, some embodiments can increase by signal on traditional optical transmission circuit and power-performance, can also reduce production costs.
Fig. 3 shows the optical transmission circuit 300 that can use embodiment disclosed herein.Simultaneously, will describe some details of optical transmission circuit 300,300 of optical transmission circuits are described by by way of example, and are not used in the scope of restriction claim of the present invention.Embodiment disclosed in this invention is suitable for 1G, 2G, 4G, 10G and the more light link of high bandwidth optic fibre.In addition, embodiment disclosed in this invention can be used in light (as, the laser) emittor/receiver of any form factor, as XFP, SFP and SFF, and is not limited to above-mentioned example.As described, embodiment disclosed by the invention is not limited by optical transceiver environment.
Optical transmission circuit 300 can be from being connected to the source of electro-optic transducer 310, and for example host computer system shown in arrow 301, receives electric signal.Electro-optic transducer driver 310 can be but be not limited to laser driver or light emitting diode (LED) driver, and drive electro-optic transducer 330 by control operational factor such as bias current.Between electro-optic transducer driver 310 and electro-optic transducer 330, insert transmitting device or interconnection level 320, thereby optimize from electro-optic transducer driver 310 to electro-optic transducer the transmission of 330 electric signal.
Electro-optic transducer driver 310 has two output terminals or node, and these two output terminals or node all with transmitting device 320 couplings, as by connecting shown in 311 and 312.Although show two connections that are used for differential signal between electro-optic transducer driver 310 and the transmitting device 320, electro-optic transducer driver 310 also can have more than 2 signals with transmitting device 320 and is connected.
Attention is in instructions and claims, and " coupling " is defined as between the two or more circuit objects of expression without any the indirect connection that has two or more insertion circuit objects between the direct connection of inserting circuit object and the two or more circuit object.For example, two circuit objects that are directly connected to the other side are " couplings " each other.If between same two circuit objects one or more insertion circuit objects being arranged also is " coupling " each other.
Transmission mechanism/interconnect stage 320 is by connecting 311 and 312 from electro-optic transducer driver 310 reception electric signal.Although two input nodes are shown, transmission mechanism/interconnect stage 320 also can have any amount of input node as required.In a lot of embodiments, transmission mechanism/interconnect stage 320 has the input node with the output terminal equal number of electro-optic transducer driver 310, but this not necessarily.Just as mentioned, the transmission between transmission mechanism/interconnect stage 320 optimization electro-optic transducer driver and the electro-optic transducer.The embodiment of transmission mechanism/interconnect stage 320 will be described below.Notice in some embodiments, transmission mechanism/interconnect stage 320 can be the part of electro-optic transducer driver 310, can be in the outside of electro-optic transducer driver 310, perhaps can have for the part of the part of electro-optic transducer driver 310 with in the part of electro-optic transducer driver 310 outsides.
Electro-optic transducer 330 input ends are connected to the output node of transmission mechanism/interconnect stage 320, connect shown in 321 and 322 as passing through.Electro-optic transducer 330 can have two input ends, as shown in Figure 3, perhaps as required additional input end can be arranged.Electro-optic transducer 330 can be laser instrument or LED, and receives electric signal from transmitting device 320, and with the light signal of this electrical signal conversion for the information that can represent in the electric signal to be comprised.Thereby can connecting on 302 in output, electro-optic transducer 330 launches light signal.It also can be for example to be coupled to the optical fiber of far-end optical transceiver that light connects 302.Like this, optical transmission circuit 300 obtains electric signal, is converted into light signal, and communicates by letter with external source.
Optical transmission circuit 300 can be the part of optical transceiver module and/or can be the part of host computer system.Alternatively, the some parts of transmission circuit 300 can be in optical transceiver, and other parts can be in host computer system simultaneously.For example, transmission circuit 300 can all be included in the optical transceiver module.Optical transceiver can be coupled to host computer system.Alternatively, the assembly of transmission circuit 300, for example electro-optic transducer driver 310, can be contained in the host computer system, and Sheng Xia assembly is contained in the optical transceiver module simultaneously.The layout of transmission circuit 300 assemblies, perhaps, unimportant to embodiments of the present invention in host computer system or at optical transceiver module.
Forward Fig. 4 now to, show the corresponding exemplary DC coupling light of a specific embodiment transmission circuit 400 with transmission circuit 300.Notice that present embodiment is only with explaining the scope that is not limited to claim of the present invention.
As shown, optical transmission circuit 400 comprises electro-optic transducer driver output stage 405 (also being known as " driver-level 405 " here).In the embodiment that illustrates, electro-optic transducer driver 405 is shown current mode logic (CML) output stage.The CML output stage normally has the difference output stage of two complementary output nodes, thereby output stage can be utilized the speed of difference output and the advantage of signal fidelity.Notice that embodiment disclosed by the invention also can use the electro-optic transducer driver level of other types.In some embodiments, electro-optic transducer driver 405 can be a laser driver.
Optical transmission circuit 400 comprises the voltage source 450 that is used for providing to circuit electric current.In order to produce the AC compounent of electric current, electro-optic transducer driver output stage 405 have be used to receive will as the differential data of optical signal transmission (by signal DATA and DATA! Illustrate) the differential data input end.Data input difference bipolar transistor has the base stage that is coupled to the differential data input end to 406A and 406B.Such as, if light transmission electric current 400 is the parts that are coupled to the optical transceiver of host computer system, data can provide by host computer system.In the embodiment that illustrates, transistor 406A has the base stage that is coupled to data-signal DATA, simultaneously transistor 406B have the complementary data signal of being coupled to DATA! Base stage.In addition, bipolar transistor has to be coupled to 406A and 406B provides modulating current I
MODModulation current source 408 on emitter separately.Therefore, by current source 408, draw modulating current from data input bipolar transistor 406A and 406B emitter.
In addition, the collector coupled of transistor 406B is to bias current sources 402.In some embodiments, be coupled with inductor 403 between collector node and bias current sources 402, this inductor 403 can be any rational inductor.In addition, following will the detailed description in detail, transistor 406B pulling bias current I
BIASBy electro-optic transducer 470.Advantage is, because photoelectricity transmission circuit 400 is DC coupling, so be applied with identical bias current on driver-level 405 and electro-optic transducer 470.
Data input bipolar transistor 406A and 406B also have the collector with the input of transmission mechanism/interconnect stage 410 coupling.Collector serves as the output node of electro-optic transducer driver level 405.In the embodiment that illustrates, the collector coupled of transistor 406A is to transmission line structure 411, and the collector coupled of transistor 406B is to transmission line structure 412 simultaneously.In some embodiments. Transmission line structure 411 and 412 can be printed circuit board (PCB) (a PCB trace), but this not necessarily.
Notice that transmission line structure 411 and 412 is used for the output node of driver-level 405 is coupled to the input difference end of electro-optic transducer 470.Therefore, if conditions permit (circumstance warrant) transmission line structure 411 can be different length with 412.Yet in some embodiments, the output node of driver-level 405 can not use transmission line structure 411 and 412 or do not use the transmission line structure in any other structure discussed below to be coupled to electro-optic transducer 470.
In any case, should be noted that the output node of driver-level 405 all is coupled, either directly or indirectly, to the differential input end of electro-optic transducer 470.Therefore, this makes optical transmission line 400 can utilize the advantage of difference output aspect speed and signal fidelity.This has only an output node to be coupled to transducer and the DC coupling transmission circuit of another node by resistor termination is different with previously discussed.
As typical example, need terminated line structure 411 and 412 to prevent the degradation of the light signal that has sent that unnecessary reflection causes.In traditional transmission circuit, two transmission line structures all need termination.Advantageously, principle of the present invention allows single terminal to terminate at all transmission line structures in the optical transmission line 400 effectively.In other words, transmission line structure 411 and 412 does not need terminal separately.For example, can be between first differential input end of transmission structure 411 and electro-optic transducer 470 coupled end termination resistor 420.Go out as shown, a node of termination resistor 420 also is coupled to voltage source 450.In some embodiments, termination resistor 420 can be coupled to voltage source 450 by any rational inductor 451.
Typically, termination resistor 420 has the resistance value with the impedance phase of transmission line 411 and 412 coupling.And any other transmission line structure also can be the part of optical transmission circuit 400.In some embodiments, termination resistor 420 can be in the magnitude that is about 20-50 ohm.Yet if conditions permit, other values also can be used.Advantageously, use single-end termination resistor 420 to come the various transmission line structures of the termination system that makes to use lower voltage VCC from voltage source 450, and make electro-optic transducer 470 can use higher available drive current, will be in following more detailed explanation.In addition,, only a spot of resistor need be set, reduce the difficulty and the cost of manufacturing process, can reduce production costs because near electro-optic transducer.
With reference to Fig. 4, in some embodiments, electro-optic transducer 470 is included in TO Can encapsulation or the analog structure.Under these circumstances, usually need to implement extra transmission line structure and transmit light signal with head by TO Can.For example, the right hand node of termination resistor 420 can be coupled on the transmission line structure 430, and transmission line structure 412 also is coupled on the transmission line structure 431 simultaneously.In some embodiments, transmission line structure 430 and 431 can be based on the feedthrough (TO Can header basefeed-through) of TO Can head, but this not necessarily.In other embodiment, transmission line structure 412 and 431 can be identical transmission line structure.
As previously mentioned, electro-optic transducer 470 can make laser instrument or LED and have first and second differential input ends.First difference input (anode among Fig. 4) is configured to be coupled to voltage source 450 when transmission circuit 400 work.As shown in the figure, first node is coupled to the right hand node of termination resistor 420 by transmission line structure 430.On the other hand, second difference input node (negative electrode among Fig. 4) can be directly or is indirectly coupled to the collector of transistor 406B by transmission line 412 and/or 431.
The electric current topology of having described that is used for transmission circuit 400 produces two DC path, and its advantage is to allow transmission circuit 400 to have effective power-performance.For example, transistor 406B pulling electric current is by first DC path, and wherein first DC path is from voltage source 450 and inductor 451, and the input of first and second difference of process electro-optic transducer 470 is connected to ground by inductor 403 and current source 402 then.Notice that electric current can pass any transmission line structure that can be coupling between other circuit block, as transmission line structure 412 and/or 431.As previously mentioned, do not have termination resistor on this paths, this makes also can cause bigger pressure drop the intrinsic pressure drop of electro-optic transducer 470 on the path and other assemblies.Advantage is, can use less voltage source 450 to provide to drive the required electric current of electro-optic transducer 470.In addition, can drive electro-optic transducer 470 by a spot of voltage available space.Because there is not big loss (strain) on voltage space, this allows circuit to work in the scope of big electric current and temperature.
In second DC path, transistor 406A pulling electric current arrives transistor 406A from voltage source 450 and inductor 451 through termination resistor 420.Notice that electric current can be by being coupling in any transmission line structure between other circuit block in the path, in transmission-line structure 411 and/or 430.In this DC path, will have pressure drop at termination resistor 420 two ends.Yet,, can realize having mentioned voltage headroom savings and power efficiency because pressure drop does not occur in the current path of electro-optic transducer 470.
Now, the AC coupling embodiment of photocurrent 400 is described referring to Fig. 5.Notice that discusses among circuit topology and Fig. 4 is similar, and much assembly is identical, thereby repeats no more here.Because present embodiment is an AC coupling, optical transmission circuit 400 also is included in pull-up resistor 481 that is coupled between the collector of voltage source 450 and transistor 406A and the pullup resistor 482 that is coupled between the collector of voltage source 450 and the pipe 406B of collective.Optical transmission circuit 400 also is included in the ac coupling capacitor device 483 of coupling between the collector of transistor 406A and the transmission line structure 411, and the ac coupling capacitor 488 of coupling between the collector of transistor 406B and transmission-line structure 412.As already mentioned, AC coupling needs driver 405 and electro-optic transducer 470 to use biasing respectively.Therefore, some power efficiencies of in Fig. 4, discussing have been lost.In addition, because stray inductance, ac coupling capacitor device 483 and 488 may be introduced some distorted signals.
Yet the AC coupling embodiment although there is not the performance of the embodiment that relates among Fig. 4 so good, but still has advantage than traditional AC-coupled transmit circuits.For example, the topology of Fig. 5 still allows the various transmission-line structure in the single-end termination resistor 420 termination transmission circuits 400.In addition, topology also allows two discrete DC path.The embodiment that relates to as Fig. 4, the DC path by electro-optic transducer 470 does not comprise termination resistor 420.Therefore, the embodiment of Fig. 5 still can utilize low voltage source and the previous voltage headroom savings of discussing.
Therefore, the optical transmission circuit that relates to of embodiment disclosed in this invention comprises driver output stage, electro-optic transducer and is used for electric signal is transferred to from driver the transmission mechanism/interconnect stage of electro-optic transducer.In AC coupling and DC coupling embodiment, the termination that transmission mechanism/interconnect stage uses the single-termination resistor to provide as transmission line structure.Therefore, can use less voltage source to come driving circuit and the available voltage space of saving.In addition, the DC coupling embodiment uses differential transmission scheme, thereby allows optical transmission circuit to utilize the advantage of difference output end aspect speed and fidelity.Thereby embodiment disclosed in this invention is compared tool with traditional AC coupling with the DC coupling optical transmission circuit and is had greatly improved.
Under the situation that does not depart from its principle or essential characteristic, the present invention can other concrete mode implement.That described embodiment is only thought the property illustrated in all respects and nonrestrictive.So scope of the present invention is limited by appended claims rather than aforementioned specification.All modification that fall into the implication of claims equivalent and scope are all in the scope of claims.
Claims (22)
1. one kind is used for from the output stage of the electro-optic transducer driver transmitting device to the electro-optic transducer transmission of electric signals.This transmitting device comprises:
First and second differential input ends of electro-optic transducer, wherein, described first differential input end is configured to be coupled with voltage source when work;
Termination resistor with first node, first differential input end coupling of described first node and described electro-optic transducer;
The first electro-optic transducer driver output node is with the Section Point coupling of described terminating resistor;
The second electro-optic transducer driver output node is with second differential input end coupling of described electro-optic transducer;
First DC path, from first differential input end of described electro-optic transducer to the described second electro-optic transducer driver output node; And
Second DC path, from the first node of described terminating resistor to the described first electro-optic transducer driver output node.
2. transmitting device according to claim 1 is characterized in that, also comprises:
The transmission line that between first output node of the Section Point of described terminating resistor and electro-optic transducer driver, is coupled; And
Second difference at described electro-optic transducer is imported the transmission line that is coupled between second output node of node and described electro-optic transducer driver.
3. transmitting device according to claim 2 is characterized in that, described transmission line is one of in printed circuit board (PCB) (PCB) trace and the basic feedthrough.
4. transmitting device according to claim 1 is characterized in that, also comprises:
Import the transmission line that is coupled between the node at the first node of described terminating resistor and first difference of described electro-optic transducer; And
Second difference at described electro-optic transducer is imported the transmission line that is coupled between second output node of node and described electro-optic transducer driver.
5. transmitting device according to claim 4 is characterized in that, described transmission line is one of in a printed circuit board trace and the basic feedthrough.
6. transmitting device according to claim 1 is characterized in that, when work, the output node of described first and second electro-optic transducer driver is configured to provide direct current biasing and ac modulation to electro-optic transducer.
7. transmitting device according to claim 1 is characterized in that, the described first and second electro-optic transducer driver output node DC coupling are to first and second differential input ends of described electro-optic transducer.
8. transmitting device according to claim 1 is characterized in that, the described first and second electro-optic transducer driver output nodes are ac-coupled to first and second differential input ends of described electro-optic transducer.
9. transmitting device according to claim 1 is characterized in that, described electro-optic transducer is one of in laser diode or the light emitting diode (LED).
10. transmitting device according to claim 1 is characterized in that, first and second output nodes of described electro-optic transducer are the parts of current mode logic (CML) electro-optic transducer driver output stage.
11. an optical transmission circuit comprises:
Electro-optic transducer;
Electro-optic transducer driver; And
The interconnection level that between described electro-optic transducer driver and described electro-optic transducer, is coupled; Wherein, described interconnection level comprises following:
First and second differential input ends of electro-optic transducer, wherein, described first difference when work
Input end is configured to be coupled with voltage source;
Terminating resistor with first node, first differential input end coupling of described first node and described electro-optic transducer;
The first electro-optic transducer driver output node is with the Section Point coupling of described terminating resistor;
The second electro-optic transducer driver output node is with second differential input end coupling of described electro-optic transducer;
First DC path, from first differential input end of described electro-optic transducer to the described second electro-optic transducer driver output node; And
Second DC path, from the first node of described terminating resistor to the described first electro-optic transducer driver output node.
12. optical transmission circuit according to claim 11 is characterized in that, described interconnection level also comprises:
The transmission line that between first output node of the Section Point of described terminating resistor and described electro-optic transducer driver, is coupled; And
Second difference at described electro-optic transducer is imported the transmission line that is coupled between second output node of node and described electro-optic transducer driver.
13. optical transmission circuit according to claim 12 is characterized in that, described transmission line is one of in printed circuit board (PCB) (PCB) trace and the basic feedthrough.
14. optical transmission circuit according to claim 11 is characterized in that, interconnection level also comprises:
Import the transmission line that is coupled between the node at the first node of described terminating resistor and first difference of described electro-optic transducer; And
Second difference at described electro-optic transducer is imported the transmission line that is coupled between second output node of node and described electro-optic transducer driver.
15. optical transmission circuit according to claim 14 is characterized in that, described transmission line is one of in a printed circuit board trace and the basic feedthrough.
16. optical transmission circuit according to claim 11 is characterized in that, the described first and second electro-optic transducer driver output nodes are configured to provide direct current biasing and ac modulation to described electro-optic transducer when work.
17. optical transmission circuit according to claim 11 is characterized in that, the described first and second electro-optic transducer driver output node DC coupling to first and second differential input ends of described electro-optic transducer are.
18. optical transmission circuit according to claim 11 is characterized in that, described first and second electro-optic transducer driver output node is ac-coupled to first and second differential input ends of described electro-optic transducer.
19. optical transmission circuit according to claim 11 is characterized in that, described electro-optic transducer is one of in laser diode or the light emitting diode (LED).
20. optical transmission circuit according to claim 11 is characterized in that, described electro-optic transducer driver is one of in laser driver or the led driver.
21. optical transmission circuit according to claim 11, it is characterized in that described optical transmission circuit is one of surpassing in the laser transceiver of 10G of 1G laser transceiver, 2G laser transceiver, 4G laser transceiver, 8G laser transceiver, 10G laser transceiver or the link of suitable optical fiber light.
22. optical transmission circuit according to claim 11 is characterized in that, optical transmission circuit is one of in XFP laser transceiver, SFP laser transceiver or the SFF laser transceiver.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65998105P | 2005-03-09 | 2005-03-09 | |
| US60/659,981 | 2005-03-09 | ||
| US11/370,311 | 2006-03-08 |
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| CN101171537A true CN101171537A (en) | 2008-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800152703A Pending CN101171537A (en) | 2005-03-09 | 2006-03-09 | Interconnect mechanism for connecting a laser driver to a laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591219A (en) * | 2011-01-05 | 2012-07-18 | 浙江彩虹鱼通讯技术有限公司 | Interface control circuit and method, all-fiber joint and all-fiber transmission line |
| CN109067388A (en) * | 2018-08-31 | 2018-12-21 | 龙迅半导体（合肥）股份有限公司 | A kind of CML structure output driving stage circuit |
-
2006
- 2006-03-09 CN CNA2006800152703A patent/CN101171537A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591219A (en) * | 2011-01-05 | 2012-07-18 | 浙江彩虹鱼通讯技术有限公司 | Interface control circuit and method, all-fiber joint and all-fiber transmission line |
| CN102591219B (en) * | 2011-01-05 | 2015-09-09 | 浙江彩虹鱼通讯技术有限公司 | Interface control circuit, method, all-fiber joint and all-fiber transmission line |
| CN109067388A (en) * | 2018-08-31 | 2018-12-21 | 龙迅半导体（合肥）股份有限公司 | A kind of CML structure output driving stage circuit |
| CN109067388B (en) * | 2018-08-31 | 2022-05-24 | 龙迅半导体（合肥）股份有限公司 | CML structure output drive stage circuit |
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