CN103152103A - Optical module and adaptive regulation method for rate mode of clock and data recovery (CDR) chip of optical module - Google Patents
Optical module and adaptive regulation method for rate mode of clock and data recovery (CDR) chip of optical module Download PDFInfo
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- CN103152103A CN103152103A CN2013100536283A CN201310053628A CN103152103A CN 103152103 A CN103152103 A CN 103152103A CN 2013100536283 A CN2013100536283 A CN 2013100536283A CN 201310053628 A CN201310053628 A CN 201310053628A CN 103152103 A CN103152103 A CN 103152103A
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Abstract
The invention discloses an optical module and an adaptive regulation method for the rate mode of a clock and data recovery (CDR) chip of the optical module. The optical module comprises the CDR chip, a laser emission light source and a microprogrammed control unit (MCU), wherein the CDR chip integrates a laser driving circuit and a first CDR unit; the first CDR unit locks a received electric signal according to the set initiative rate mode, shapes the electric signal and outputs the shaped electric signal to the laser driving circuit to drive the laser emission light source to emit laser; and the and MCU regulates the initiative rate mode of the CDR chip according to initiative unlock state information acquired from the CDR chip. The MCU in the optical module acquires the unlock state information, which serves as feedback information, from the CDR chip, and the rate mode in the CDR chip is adaptively regulated, so that the CDR chip can regulate to have the rate mode suitable for locking signals at the current rate according to the current signal rate, and shape signals in a wider rate range to ensure signal quality.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, relate in particular to the rate mode self-adapting regulation method of a kind of optical module and CDR chip thereof.
Background technology
Present domestic market and international market have begun to use with the optical fiber communication direction that multiple business is merged with a large bandwidth and at a high rate; In numerous solutions, the appearance that Fiber to the home (FTTH) just is considered to the ultimate solution of broadband access.The domestic market is large-area applications.
And in the numerous schemes of FTTH, PON(EPON wherein) receive much concern again, become the light access way of present main flow; Wherein, ten gigabit passive optical networks are used widely.XFP(10Gigabit Small Form Factor Pluggable, 10G small sealing pluggable bright module) optical module is the core component in ten gigabit passive optical networks, is installed in the equipment such as OLT or ONU, carries out the transmitting-receiving of light signal.
At present, generally include laser emission element and laser pick-off unit in the XFP optical module of prior art, the laser pick-off unit comprises ROSA(Receiver Optical Subassembly, optical fiber receive module) and amplitude limiting amplifier circuit; Laser emission element comprises TOSA(Transmitter Optical Subassembly Assemble, light emission coaxial packaging assembly) and laser drive circuit, generally include the Laser emission light source in TOSA;
Perhaps the XFP optical module comprises BOSA(Bidirectional Optical Subassembly, bi-directional light assembly), BOSA can carry out Laser emission and reception.
Photodiode and TIA have been generally included in ROSA or BOSA.Described photodiode can be specifically the APD(Avalanche Photo Diode that is applied in the optical module of GPON network, avalanche photodide), it can be also the PIN photodiode (adding near the I district of intrinsic material between P, N knot, the semiconductor photo detector of formation PIN structure) that is applied in the optical module of EPON network.Photodiode can be exported corresponding response current Ipd, TIA(Tranimpedance Amplifier, trans-impedance amplifier after detecting light signal) will export corresponding differential electric signal; This differential signal is sent to limiting amplifier, the corresponding signal of telecommunication of limiting amplifier output.
Generally included the Laser emission light source in TOSA or BOSA, after the laser drive circuit of Laser emission light source receives the signal of telecommunication, according to the laser of the signal of telecommunication driving laser transmitting illuminant emission specific wavelength that receives.
Along with the lifting of network rate, when the XFP optical module carries out 10,000,000,000 above speed rates, signal quality will obviously descend; In order to ensure signal quality, adopting CDR(Clock and Data Recovery in the XFP optical module, clock and data recovery) device carries out the shaping Recovery processing to the signal of telecommunication that transmits; In XFP optical module as shown in Figure 1, the employing model is that the CDR chip of GN2010D carries out the shaping of the signal of telecommunication.
Integrated laser drive circuit and a CDR unit in the CDR chip, and limiting amplifier and the 2nd CDR unit.
The one CDR unit carries out Shape correction to the signal of telecommunication that is input to laser drive circuit, and the 2nd CDR unit carries out Shape correction to the signal of telecommunication of limiting amplifier output, thereby guarantees that optical module receives, the quality of the signal of emission.
Before the one CDR unit and the 2nd CDR unit carry out shaping to the signal of telecommunication, need to carry out Frequency Locking to the signal of telecommunication; In other words, after the signal of telecommunication was carried out Frequency Locking, a CDR unit and the 2nd CDR unit could carry out shaping to the signal of telecommunication.
Yet when network environment related to multiple transport protocols, the speed range of the signal that transmits in EPON can be very wide; Speed range may comprise: from lower than 8.5Gb/s to 11.7Gb/s.And signal frequency changes along with the change of signal rate often; That is to say, the common frequency of the signal that speed is low is also lower, and its frequency of signal that speed is high can be higher.And the CDR chip is fixed as after optical module initially powers on a predefined rate mode usually; Cause the CDR chip can not lock the signal that exceeds the extraneous speed of this predefined rate mode disposal ability, also just can't carry out shaping to these signals, ensure signal quality.
In sum, the optical module of prior art can't carry out shaping, ensure signal quality the signal of a wider speed range, does not have the compatibility of better multiple transport protocols.
Summary of the invention
Embodiments of the invention provide the rate mode self-adapting regulation method of a kind of optical module and CDR chip thereof, can make optical module carry out shaping, ensure signal quality for the signal of wider speed range, have the compatibility of multiple transport protocols.
According to an aspect of the present invention, provide a kind of optical module, having comprised: CDR chip, Laser emission light source, MCU;
Wherein, integrated laser drive circuit and a CDR unit in described CDR chip;
Described laser drive circuit is connected with described Laser emission light source by the external pin of described CDR chip, after the external pin of the one CDR unit by described CDR chip receives the signal of telecommunication, carry out shaping after according to the rate mode of making a start that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after output Shaping arrives the electric signal input end of described laser drive circuit, the described Laser emission light source Emission Lasers of signal of telecommunication driving that described laser drive circuit basis is inputted from its electric signal input end;
Described MCU is connected by communication bus with described CDR chip, and described MCU obtains from described CDR chip the out-of-lock condition information of making a start; And according to make a start rate mode adjust of the out-of-lock condition information of making a start of obtaining to described CDR chip.
Further, described optical module also comprises: photodiode and trans-impedance amplifier TIA; And also be integrated with in described CDR chip: amplitude limiting amplifier circuit and the 2nd CDR unit; Wherein,
Described photodiode is connected with TIA, the electrical signal of described TIA is connected with the electric signal input end of described amplitude limiting amplifier circuit by the external pin of described CDR chip, and described amplitude limiting amplifier circuit carries out limited range enlargement output to the signal of telecommunication of its electric signal input end input; After the signal of telecommunication of the 2nd described amplitude limiting amplifier circuit output of CDR unit reception, carry out shaping after according to the receiving end rate mode that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after shaping is exported by the external pin of described CDR chip;
Described MCU also obtains receiving end out-of-lock condition information from described CDR chip; And according to the receiving end out-of-lock condition information of obtaining, the receiving end rate mode of described CDR chip is adjusted.
Preferably, described MCU also is used for the receiving end rate mode in described CDR chip being adjusted to identical with the described rate mode of making a start after definite described photodiode does not detect the efficient light signal.
Preferably, described Laser emission light-source encapsulation is in TOSA, and described photodiode and TIA are packaged in ROSA; Perhaps,
Described Laser emission light source, photodiode and TIA are packaged in BOSA.
According to another aspect of the present invention, also provide the rate mode self-adapting regulation method of CDR chip in a kind of optical module, having comprised:
The CDR chip of MCU in described optical module from described optical module obtains the out-of-lock condition information of making a start; And according to make a start rate mode adjust of the out-of-lock condition information of making a start of obtaining to described CDR chip;
Wherein, described optical module also comprises: the Laser emission light source; Integrated laser drive circuit and a CDR unit in described CDR chip;
Described laser drive circuit is connected with described Laser emission light source by the external pin of described CDR chip, after the external pin of the one CDR unit by described CDR chip receives the signal of telecommunication, carry out shaping after according to the rate mode of making a start that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after output Shaping arrives the electric signal input end of described laser drive circuit, the described Laser emission light source Emission Lasers of signal of telecommunication driving that described laser drive circuit basis is inputted from its electric signal input end.
Preferably, make a start rate mode adjust of the out-of-lock condition information of making a start that described basis is obtained to described CDR chip specifically comprises:
If it is out-of-lock condition that described MCU judges the current out-of-lock condition information of making a start of obtaining, and the out-of-lock condition information of making a start of obtaining before is lock-out state, carry out the adjustment of the described rate mode of making a start according to following method:
With the described rate mode of making a start from the flank speed pattern, successively to the minimum speed limit mode adjustment; After the described rate mode of making a start of each adjustment, described MCU obtains from described CDR chip the out-of-lock condition information of making a start; If the out-of-lock condition information of making a start of obtaining is still adjusted for out-of-lock condition continues next time; If the out-of-lock condition information of making a start of obtaining is lock-out state, no longer continue to adjust.
Further, described method also comprises:
Described MCU also obtains receiving end out-of-lock condition information from described CDR chip; And according to the receiving end out-of-lock condition information of obtaining, the receiving end rate mode of described CDR chip is adjusted; And
Also comprise in described optical module: photodiode and trans-impedance amplifier TIA; And also be integrated with in described CDR chip: amplitude limiting amplifier circuit and the 2nd CDR unit;
Wherein, described photodiode is connected with TIA, the electrical signal of described TIA is connected with the electric signal input end of described amplitude limiting amplifier circuit by the external pin of described CDR chip, and described amplitude limiting amplifier circuit carries out limited range enlargement output to the signal of telecommunication of its electric signal input end input; After the signal of telecommunication of the 2nd described amplitude limiting amplifier circuit output of CDR unit reception, carry out shaping after according to the receiving end rate mode that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after shaping is passed through the external pin output of described CDR chip.
Preferably, the receiving end out-of-lock condition information that described basis is obtained is adjusted the receiving end rate mode of described CDR chip, specifically comprises:
If it is out-of-lock condition that described MCU judges the current receiving end out-of-lock condition information of obtaining, and the receiving end out-of-lock condition information of obtaining before is lock-out state, carry out the adjustment of described receiving end rate mode according to following method:
With described receiving end rate mode from the flank speed pattern, successively to the minimum speed limit mode adjustment; After the described receiving end rate mode of each adjustment, described MCU obtains receiving end out-of-lock condition information from described CDR chip; If the receiving end out-of-lock condition information of obtaining is still adjusted for out-of-lock condition continues next time; If the receiving end out-of-lock condition information of obtaining is lock-out state, no longer continue to adjust.
Preferably, described with described receiving end rate mode from the flank speed pattern, according to the sequence of speed, before the minimum speed limit mode adjustment, also comprise successively:
Described MCU determines that described optical module is current for non-low-power consumption mode, and the output of making a start is not closed.
Further, described method also comprises:
Described MCU adjusts to the receiving end rate mode in described CDR chip identical with the described rate mode of making a start after definite described photodiode does not detect the efficient light signal.
The optical module that the embodiment of the present invention provides, carries out the self adaptation adjustment to the rate mode in the CDR chip, and is no longer the rear fixing rate mode that powers on as feedback information due to the out-of-lock condition information in the CDR chip obtained by the MCU in optical module; Thereby the CDR chip can be according to current demand signal speed, be adjusted into the rate mode of the signal that is fit to the locking present rate, reaches the purpose that the signal for wider speed range carries out shaping, ensures signal quality; Make optical module can compatible optical-fiber network in the host-host protocol of different transmission rates.
Description of drawings
Fig. 1 is the circuit diagram that the interior CDR chip of the optical module of prior art carries out signal of telecommunication shaping;
Fig. 2 is the optical module internal circuit schematic diagram of the embodiment of the present invention;
Fig. 3 is that the MCU of the embodiment of the present invention is to the flow chart of the self-adapting regulation method of the rate mode of making a start in the CDR chip;
Fig. 4 is that the MCU of the embodiment of the present invention is to the flow chart of the self-adapting regulation method of the receiving end rate mode in the CDR chip.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.Yet, need to prove, many details of listing in specification are only in order to make the reader to one or more aspects of the present invention, a thorough understanding be arranged, even if do not have these specific details also can realize these aspects of the present invention.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant to computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: the thread of the process of moving on processor, processor, object, executable program, execution, program and/or computer.
The present inventor considers, can be by the MCU(Microprogrammed Control Unit in optical module, microprogram control unit) obtain out-of-lock condition information in the CDR chip as feedback information, the rate mode in the CDR chip is carried out the self adaptation adjustment; Thereby the CDR chip can be according to current demand signal speed, be adjusted into the rate mode of the signal that is fit to the locking present rate, reaches the purpose that the signal for wider speed range carries out shaping, ensures signal quality.
Describe the technical scheme of the embodiment of the present invention in detail below in conjunction with accompanying drawing.The optical module of the embodiment of the present invention, as shown in Figure 2, comprising: CDR chip 201, Laser emission light source 202, MCU203.
Wherein, be integrated with laser drive circuit 211 and a CDR unit 212 in CDR chip 201.
Laser drive circuit 211 is connected with Laser emission light source 202 by the external pin of CDR chip 201, after the external pin of the one CDR unit 212 by described CDR chip 201 receives the signal of telecommunication, carry out shaping after according to the rate mode of making a start that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after output Shaping is to the electric signal input end of laser drive circuit 211, and laser drive circuit 211 is according to signal of telecommunication driving laser transmitting illuminant 202 Emission Lasers from its electric signal input end input;
MCU203 is connected by communication bus with CDR chip 201, and MCU203 obtains from CDR chip 201 the out-of-lock condition information of making a start; And according to make a start rate mode adjust of the out-of-lock condition information of making a start of obtaining to CDR chip 201.Communication bus between MCU203 and CDR chip 201 can be specifically IIC(Inter-Integrated Circuit, mutual integrated circuit) bus or SPI(Serial Peripheral Interface, Serial Peripheral Interface (SPI)) bus.
Particularly, after MCU203 obtains from CDR chip 201 the out-of-lock condition information of making a start, if judging the current out-of-lock condition information of making a start of obtaining is out-of-lock condition, and the out-of-lock condition information of making a start of obtaining before is lock-out state, carry out the adjustment of the described rate mode of making a start according to following method:
With the described rate mode of making a start from the flank speed pattern, successively to the minimum speed limit mode adjustment; After the described rate mode of making a start of each adjustment, described MCU obtains from described CDR chip the out-of-lock condition information of making a start; If the out-of-lock condition information of making a start of obtaining is still adjusted for out-of-lock condition continues next time; If the out-of-lock condition information of making a start of obtaining is lock-out state, no longer continue to adjust.
In fact, MCU203 can periodically obtain from CDR chip 201 the out-of-lock condition information of making a start, and for example, triggers MCU203 with the timer of setting cycle and obtains from CDR chip 201 the out-of-lock condition information of making a start; Perhaps, MCU203 obtains from CDR chip 201 the out-of-lock condition information of making a start in each cyclic process of main program.
For example, be in the CDR chip of GN2010D in model, the rate mode of making a start of setting sorts from the flank speed pattern to the minimum speed limit pattern, is respectively: first rate pattern, the second rate mode, third speed pattern.
Rate mode is set to the first rate pattern if make a start, and a CDR unit 212 can lock the signal of telecommunication of 10.3Gb/s-11.7Gb/s speed.
Rate mode is set to the second rate mode if make a start, and a CDR unit 212 can lock the signal of telecommunication of 9.95Gb/s-11.3Gb/s speed.
Rate mode is set to the third speed pattern if make a start, and a CDR unit 212 can lock 8.5Gb/s speed left and right and the following signal of telecommunication; And needn't carry out shaping for the too low signal of telecommunication of speed, to its direct bypass channel.
Fig. 3 shows the flow process of the self-adapting regulation method of the rate mode of making a start in the CDR chip that MCU is GN2010D to model, comprises the steps:
S301:MCU obtains from the CDR chip out-of-lock condition information of making a start.
Particularly, MCU obtains the value of the correlation behavior position related register by communication bus from the CDR chip; Value such as the mode bit TX CDR LOL that obtains reg19.bit1; If the value of TX CDR LOL is 1, show that the out-of-lock condition information of making a start is losing lock; If the value of TX CDR LOL is 0, show that the out-of-lock condition information of making a start is locking.
If S302:MCU judges the out-of-lock condition information of making a start and is converted to out-of-lock condition by lock-out state, carry out following steps S303; If judge the out-of-lock condition Information preservation lock-out state of making a start, the adjustment of the rate mode of need not making a start jumps to step S320 and finishes.
Particularly, if it is out-of-lock condition that MCU judges the current out-of-lock condition information of making a start of obtaining, and the out-of-lock condition information of making a start of obtaining before is lock-out state, be converted to out-of-lock condition by lock-out state determining the out-of-lock condition information of making a start, showing namely that signal rate has occured to change causes a CDR unit can not lock the current signal of telecommunication, following steps S303 is carried out in need to the make a start adjustment of rate mode.If the current out-of-lock condition information of making a start of obtaining still remains lock-out state, show the adjustment of the rate mode of need not making a start, jump to step S320 and finish.
S303:MCU judge optical module current whether be low-power consumption mode, and make a start output whether close; Optical module is current is non-low-power consumption mode if judge, and makes a start to export and do not close, and continues execution in step S304, the adjustment of the rate mode of making a start; Otherwise, jump to step S320 and finish.
The rate mode of making a start in S304:MCU CDR chip is set to the flank speed pattern---the first rate pattern.
S305:MCU obtains from the CDR chip out-of-lock condition information of making a start.
S306:MCU judges whether the current out-of-lock condition information of making a start of obtaining is out-of-lock condition; If proceed next time and adjust, execution in step S307; If not, show that under the first rate pattern CDR unit can lock the signal of telecommunication of current transmission, needn't carry out again next time and adjust, jump to step S320 and finish.
The rate mode of making a start in S307:MCU CDR chip is set to the second rate mode.
S308:MCU obtains from the CDR chip out-of-lock condition information of making a start.
S309:MCU judges whether the current out-of-lock condition information of making a start of obtaining is out-of-lock condition; If proceed next time and adjust, execution in step S310; If not, show that under the first rate pattern CDR unit can lock the signal of telecommunication of current transmission, needn't carry out again next time and adjust, jump to step S320 and finish.
The rate mode of making a start in S310:MCU CDR chip is set to the third speed pattern.
S320: finish.
Further, the optical module of the embodiment of the present invention also comprises: photodiode 204 and trans-impedance amplifier TIA205; And also be integrated with in CDR chip 201: amplitude limiting amplifier circuit 213 and the 2nd CDR unit 214.
MCU203 also obtains receiving end out-of-lock condition information from CDR chip 201; And according to the receiving end out-of-lock condition information of obtaining, the receiving end rate mode of described CDR chip 201 is adjusted.
Particularly, after MCU203 obtains receiving end out-of-lock condition information from CDR chip 201, if judging the current receiving end out-of-lock condition information of obtaining is out-of-lock condition, and the receiving end out-of-lock condition information of obtaining before is lock-out state, carry out the adjustment of described receiving end rate mode according to following method:
With described receiving end rate mode from the flank speed pattern, successively to the minimum speed limit mode adjustment; After the described receiving end rate mode of each adjustment, described MCU obtains receiving end out-of-lock condition information from described CDR chip; If the receiving end out-of-lock condition information of obtaining is still adjusted for out-of-lock condition continues next time; If the receiving end out-of-lock condition information of obtaining is lock-out state, no longer continue to adjust.
Similarly, MCU203 can periodically obtain receiving end out-of-lock condition information from CDR chip 201, for example, triggers MCU203 with the timer of setting cycle and obtains receiving end out-of-lock condition information from CDR chip 201; Perhaps, MCU203 obtains receiving end out-of-lock condition information from CDR chip 201 in each cyclic process of main program.
For example, be in the CDR chip of GN2010D in model, the receiving end rate mode of setting sorts from the flank speed pattern to the minimum speed limit pattern, is respectively: first rate pattern, the second rate mode, third speed pattern.
If the receiving end rate mode is set to the first rate pattern, the 2nd CDR unit 214 can lock the signal of telecommunication of 10.3Gb/s-11.7Gb/s speed.
If the receiving end rate mode is set to the second rate mode, the 2nd CDR unit 214 can lock the signal of telecommunication of 9.95Gb/s-11.3Gb/s speed.
If the receiving end rate mode is set to the third speed pattern, the 2nd CDR unit 214 can lock 8.5Gb/s speed left and right and the following signal of telecommunication; And needn't carry out shaping for the too low signal of telecommunication of speed, to its direct bypass channel.
Fig. 4 shows the flow process of the self-adapting regulation method of the receiving end rate mode in the CDR chip that MCU is GN2010D to model, comprises the steps:
S401:MCU obtains receiving end out-of-lock condition information from the CDR chip.
Particularly, MCU obtains the value of the correlation behavior position related register by communication bus from the CDR chip; Such as the value of obtaining mode bit RX CDR LOL; If the value of RX CDR LOL is 1, show that receiving end out-of-lock condition information is losing lock; If the value of RX CDR LOL is 0, show that receiving end out-of-lock condition information is locking.
Information is converted to out-of-lock condition by lock-out state if S402:MCU judges the receiving end out-of-lock condition, carries out following steps S404; Otherwise, need not carry out the adjustment of receiving end rate mode, jump to step S420 and finish.
Particularly, if it is out-of-lock condition that MCU judges the current receiving end out-of-lock condition information of obtaining, and the receiving end out-of-lock condition information of obtaining before is lock-out state, be converted to out-of-lock condition by lock-out state determining receiving end out-of-lock condition information, showing namely that signal rate has occured to change causes a CDR unit can not lock the current signal of telecommunication, need to carry out the adjustment of receiving end rate mode, carry out following steps S404.If the current receiving end out-of-lock condition information of obtaining still remains lock-out state, show and need not carry out the adjustment of receiving end rate mode, jump to step S420 and finish.
Receiving end rate mode in S404:MCU CDR chip is set to the flank speed pattern---the first rate pattern.
S405:MCU obtains receiving end out-of-lock condition information from the CDR chip.
S406:MCU judges whether the current receiving end out-of-lock condition information of obtaining is out-of-lock condition; If proceed next time and adjust, execution in step S407; If not, show that under the first rate pattern CDR unit can lock the signal of telecommunication of current transmission, needn't carry out again next time and adjust, jump to step S420 and finish.
Receiving end rate mode in S407:MCU CDR chip is set to the second rate mode.
S408:MCU obtains receiving end out-of-lock condition information from the CDR chip.
S409:MCU judges whether the current receiving end out-of-lock condition information of obtaining is out-of-lock condition; If proceed next time and adjust, execution in step S410; If not, show that under the first rate pattern CDR unit can lock the signal of telecommunication of current transmission, needn't carry out again next time and adjust, jump to step S420 and finish.
Receiving end rate mode in S410:MCU CDR chip is set to the third speed pattern.
S420: finish.
Owing to considering, for the XFP optical module mode of operation of transmission continuously normally, and originating terminal signal speed is identical with receiver signal speed usually; Therefore, MCU adjusts to the receiving end rate mode in CDR chip 201 identical with the described rate mode of making a start after definite photodiode 204 does not detect the efficient light signal.
Above-mentioned Laser emission light source can be packaged in TOSA, and photodiode and TIA can be packaged in ROSA; Perhaps, above-mentioned Laser emission light source, photodiode and TIA is packaged in BOSA.
The optical module that the embodiment of the present invention provides, carries out the self adaptation adjustment to the rate mode in the CDR chip, and is no longer the rear fixing rate mode that powers on as feedback information due to the out-of-lock condition information in the CDR chip obtained by the MCU in optical module; Thereby the CDR chip can be according to current demand signal speed, be adjusted into the rate mode of the signal that is fit to the locking present rate, reaches the purpose that the signal for wider speed range carries out shaping, ensures signal quality; Make optical module can compatible optical-fiber network in the host-host protocol of different transmission rates.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to complete by program, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an optical module, comprising: CDR chip, Laser emission light source, MCU;
Wherein, integrated laser drive circuit and a CDR unit in described CDR chip;
Described laser drive circuit is connected with described Laser emission light source by the external pin of described CDR chip, after the external pin of the one CDR unit by described CDR chip receives the signal of telecommunication, carry out shaping after according to the rate mode of making a start that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after output Shaping arrives the electric signal input end of described laser drive circuit, the described Laser emission light source Emission Lasers of signal of telecommunication driving that described laser drive circuit basis is inputted from its electric signal input end;
Described MCU is connected by communication bus with described CDR chip, and described MCU obtains from described CDR chip the out-of-lock condition information of making a start; And according to make a start rate mode adjust of the out-of-lock condition information of making a start of obtaining to described CDR chip.
2. optical module as claimed in claim 1, also comprise: photodiode and trans-impedance amplifier TIA; And also be integrated with in described CDR chip: amplitude limiting amplifier circuit and the 2nd CDR unit; Wherein,
Described photodiode is connected with TIA, the electrical signal of described TIA is connected with the electric signal input end of described amplitude limiting amplifier circuit by the external pin of described CDR chip, and described amplitude limiting amplifier circuit carries out limited range enlargement output to the signal of telecommunication of its electric signal input end input; After the signal of telecommunication of the 2nd described amplitude limiting amplifier circuit output of CDR unit reception, carry out shaping after according to the receiving end rate mode that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after shaping is exported by the external pin of described CDR chip;
Described MCU also obtains receiving end out-of-lock condition information from described CDR chip; And according to the receiving end out-of-lock condition information of obtaining, the receiving end rate mode of described CDR chip is adjusted.
3. optical module as claimed in claim 1, wherein,
Described MCU also is used for the receiving end rate mode in described CDR chip being adjusted to identical with the described rate mode of making a start after definite described photodiode does not detect the efficient light signal.
4. described optical module as arbitrary in claim 1-3, is characterized in that, described Laser emission light-source encapsulation is in TOSA, and described photodiode and TIA are packaged in ROSA; Perhaps,
Described Laser emission light source, photodiode and TIA are packaged in BOSA.
5. the rate mode self-adapting regulation method of CDR chip in an optical module, is characterized in that, comprising:
The CDR chip of MCU in described optical module from described optical module obtains the out-of-lock condition information of making a start; And according to make a start rate mode adjust of the out-of-lock condition information of making a start of obtaining to described CDR chip;
Wherein, described optical module also comprises: the Laser emission light source; Integrated laser drive circuit and a CDR unit in described CDR chip;
Described laser drive circuit is connected with described Laser emission light source by the external pin of described CDR chip, after the external pin of the one CDR unit by described CDR chip receives the signal of telecommunication, carry out shaping after according to the rate mode of making a start that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after output Shaping arrives the electric signal input end of described laser drive circuit, the described Laser emission light source Emission Lasers of signal of telecommunication driving that described laser drive circuit basis is inputted from its electric signal input end.
6. method as claimed in claim 5, is characterized in that, make a start rate mode adjust of the out-of-lock condition information of making a start that described basis is obtained to described CDR chip specifically comprises:
If it is out-of-lock condition that described MCU judges the current out-of-lock condition information of making a start of obtaining, and the out-of-lock condition information of making a start of obtaining before is lock-out state, carry out the adjustment of the described rate mode of making a start according to following method:
With the described rate mode of making a start from the flank speed pattern, successively to the minimum speed limit mode adjustment; After the described rate mode of making a start of each adjustment, described MCU obtains from described CDR chip the out-of-lock condition information of making a start; If the out-of-lock condition information of making a start of obtaining is still adjusted for out-of-lock condition continues next time; If the out-of-lock condition information of making a start of obtaining is lock-out state, no longer continue to adjust.
7. method as claimed in claim 6, is characterized in that, also comprises:
Described MCU also obtains receiving end out-of-lock condition information from described CDR chip; And according to the receiving end out-of-lock condition information of obtaining, the receiving end rate mode of described CDR chip is adjusted; And
Also comprise in described optical module: photodiode and trans-impedance amplifier TIA; And also be integrated with in described CDR chip: amplitude limiting amplifier circuit and the 2nd CDR unit;
Wherein, described photodiode is connected with TIA, the electrical signal of described TIA is connected with the electric signal input end of described amplitude limiting amplifier circuit by the external pin of described CDR chip, and described amplitude limiting amplifier circuit carries out limited range enlargement output to the signal of telecommunication of its electric signal input end input; After the signal of telecommunication of the 2nd described amplitude limiting amplifier circuit output of CDR unit reception, carry out shaping after according to the receiving end rate mode that arranges, the signal of telecommunication that receives being locked, and the signal of telecommunication after shaping is passed through the external pin output of described CDR chip.
8. method as claimed in claim 7, is characterized in that, the receiving end out-of-lock condition information that described basis is obtained is adjusted the receiving end rate mode of described CDR chip, specifically comprises:
If it is out-of-lock condition that described MCU judges the current receiving end out-of-lock condition information of obtaining, and the receiving end out-of-lock condition information of obtaining before is lock-out state, carry out the adjustment of described receiving end rate mode according to following method:
With described receiving end rate mode from the flank speed pattern, successively to the minimum speed limit mode adjustment; After the described receiving end rate mode of each adjustment, described MCU obtains receiving end out-of-lock condition information from described CDR chip; If the receiving end out-of-lock condition information of obtaining is still adjusted for out-of-lock condition continues next time; If the receiving end out-of-lock condition information of obtaining is lock-out state, no longer continue to adjust.
9. method as claimed in claim 8, is characterized in that, described with described receiving end rate mode from the flank speed pattern, according to the sequence of speed, before the minimum speed limit mode adjustment, also comprise successively:
Described MCU determines that described optical module is current for non-low-power consumption mode, and the output of making a start is not closed.
10. described method as arbitrary in claim 5-9, is characterized in that, also comprises:
Described MCU adjusts to the receiving end rate mode in described CDR chip identical with the described rate mode of making a start after definite described photodiode does not detect the efficient light signal.
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