CN105610515A - Low rate DC-20Mbps double-emission SFP optical module - Google Patents
Low rate DC-20Mbps double-emission SFP optical module Download PDFInfo
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- CN105610515A CN105610515A CN201610162656.2A CN201610162656A CN105610515A CN 105610515 A CN105610515 A CN 105610515A CN 201610162656 A CN201610162656 A CN 201610162656A CN 105610515 A CN105610515 A CN 105610515A
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- light source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
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Abstract
The invention discloses a low rate DC-20Mbps double-emission SFP optical module. The low rate DC-20Mbps double-emission SFP optical module includes a microcontroller and two same optical emission modules, wherein the two optical emission modules are connected with the micro-control unit; each optical emission module includes a temperature compensating unit, a light source driver and a light source; the light source driver is connected with the light source, and is used for driving the light source to emit light according to the light source drive current; and each temperature compensating unit is connected with the light source driver and the light source, and is used for detecting the current temperature value of the optical module, compensating the optical emission power of the optical module and controlling the magnitude of the drive current transmitted to the light source from the light source driver so as to adjust the optical emission power. The low rate DC-20Mbps double-emission SFP optical module can compensate the optical emission power in different temperatures in the temperature compensating mode by canceling a traditional APC circuit, thus being able to guarantee realization of reliable data transmission when the data rate is as low as the direct current.
Description
Technical field
The present invention relates to optical module field, particularly the two transmitting of a kind of low rate DC-20Mbps SFP optical modePiece.
Background technology
In a lot of application of optic communication, all need high message transmission rate, thereby realize number efficientlyReportedly defeated demand, but in some special applications, message transmission rate requires from DC0 to tens of Mb/s,But its reliability requirement to transmission data is very high. Such as power system is for the IEEE of signal transmissionC37.94 standard, definition speed is 2.048Mb/s, minimumly can arrive 64kb/s. But in the face of so lowSpeed high reliability transport demand, conventional SFP, owing to cannot realizing the signal transmission of very low frequencies, is to enterRow transmitting, may lose some low-frequency information.
In existing scheme, there are some to adopt the backward compatible scheme to low rate of two-forty SFP module,The specific implementation of these schemes is as follows: adopt differential data input, output, AC coupling, the letter of dataNumber type be generally Pecl (PositiveEmitterCoupledLogic positive emitter coupling logic level),CML (Current-ModeLogic current mode logic); Adopt APC (automaticpowercontrolAutomated power control) circuit controls transmitting power; Applied Digital diagnostic function chip and EEPROM(ElectricallyErasableProgrammableRead-OnlyMemory electric erazable programmable onlyMemory read) parameters of module is monitored and stored.
And there is following defect in this backward compatible SFP module: 1, used APC in drive circuitCircuit, power control completes by the APC circuit of integrated chip inside, owing to being high-speed applications APC circuitData constant is very short, and low-frequency cut-off frequency is higher, and the low-frequency cutoff problem that APC brings, and makes it cannotTransmission low frequency signal there will be distorted signals in the time of low rate; 2, the signal type of general low-rate signalBe all single-ended TTL, transmitting terminal chip cannot be operated in lower-speed state, may occur output optical signal dutycycleDistortion.
In existing another scheme, its pair of utilizing emitted light module adopts SFF encapsulation, cannot support hot plug.
Summary of the invention
The invention reside in the above-mentioned deficiency of customer service prior art, a kind of transmission DC letter that can be highly reliable is providedNumber and support the two transmitting of hot-swappable low rate DC-20Mbps SFP optical module.
In order to realize foregoing invention object, the technical solution used in the present invention is:
The two transmitting of a kind of low rate DC-20Mbps SFP optical modules, comprise microcontroller, identical two lightTransmitter module, described two Optical Transmit Units all connect described micro-control unit, and described light emission module comprisesTemperature compensation unit, light source drive, light source;
Described light source drive connects described light source, for driving described light source to go out according to light source drive currentLight;
Described temperature compensation unit connects described light source drive, described light source, for detection of described optical moduleCurrent temperature value, compensates the luminous power that goes out of optical module according to the size of described temperature value, controls light sourceDriver sends to the drive current size of light source, to adjust light emitting power.
Further, described light source drive circuit adopts discrete circuit, and adopts DC coupled modes to carry outConnect.
Further, described light source drive, described temperature compensation unit also connect micro-control unit, described inThe temperature value information that micro-control unit sends for receiving described temperature compensation unit, optical drive unit sendsLight source drive current.
Further, the signal input part of described light emission module is provided with Transistor-Transistor Logic level signaling interface.
Further, described light source is any in VCSEL, FP, DFB or LED.
Further, the Tx_fault pin of described optical module, Rate_select pin are set to respectivelyThe pin for subsequent use of described two light emission module transmitting terminal Data Input Interfaces.
Compared with prior art, beneficial effect of the present invention
1, the two transmitting of a kind of low rate DC-20Mbps of the present invention SFP optical module is traditional by having cancelledAPC circuit, and adopt the mode of temperature-compensating to compensate the luminous power that goes out under different temperatures, Neng GoubaoCard is low to moderate direct current at data rate, and realizes transmission data reliably.
2, the two transmitting of a kind of low rate DC-20Mbps of the present invention SFP optical module passes through at light emission moduleSignal input part Transistor-Transistor Logic level signaling interface is set, make transmitting terminal chip can be under low rate state workDo, circuit structure of the present invention is simpler compared to existing technology, has overcome optical signal Duty Cycle Distortion simultaneouslyProblem.
3, the two transmitting of a kind of low rate DC-20Mbps of the present invention SFP optical module is to SFP pinTx_fault pin and Rate_select pin are re-set as two paths of signals input pin for subsequent use, furtherRaising the reliability of transfer of data.
Brief description of the drawings
It shown in Fig. 1, is the two transmitting of the low rate DC-20Mbps SFP optical module in one embodiment of the present of inventionModule frame chart.
It shown in Fig. 2, is the two transmitting of the low rate DC-20Mbps SFP optical mode in an alternative embodiment of the inventionThe module frame chart of piece.
Shown in Fig. 3, be the module pin definitions figure in one embodiment of the present of invention.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail. But this should be interpreted asThe scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology realizing based on content of the present inventionAll belong to scope of the present invention.
Embodiment 1:
It shown in Fig. 1, is the two transmitting of the low rate DC-20Mbps SFP optical module in one embodiment of the present of inventionModule frame chart, comprise microcontroller, identical two light emission modules, described two Optical Transmit Units are equalConnect described micro-control unit, described light emission module comprises temperature compensation unit, light source drive, light source;
Described light source drive connects described light source, for driving described light source to go out according to light source drive currentLight;
Described temperature compensation unit connects described light source drive, described light source, for detection of described optical moduleCurrent temperature value, compensates the luminous power that goes out of optical module according to the size of described temperature value, controls light sourceDriver sends to the drive current size of light source, to adjust light emitting power.
Concrete, temperature compensation module comprises luminous power compensating circuit and temperature sensor, luminous power compensation electricityThe light source drive current of light source drive is adjusted on road according to condition of different temperatures. Transceiver SFP of the present inventionIn optical module, what temperature compensation module adopted is the mode of thermistor compensation. According to the temperature of light source luminescentCharacteristic curve, luminous power compensating circuit, by selecting suitable thermistor, is realized under condition of different temperaturesAdjust the light source drive current of light source drive, reach the effect of luminous power compensation.
The two transmitting of a kind of low rate DC-20Mbps of the present invention SFP optical module is by having cancelled traditional APCCircuit, and adopt the mode of temperature-compensating to compensate the luminous power that goes out under different temperatures, can ensureData rate is low to moderate direct current, and realizes transmission data reliably.
Secondly, what traditional two utilizing emitted light modules adopted is SFF encapsulation, and this packaged type is not supported hot-swappable,The present invention adopts SFP to carry out module package, makes module possess hot-swappable function.
Further, described light source drive circuit adopts discrete circuit, and adopts DC coupled modes to carry outConnect.
Adopt circuit that discrete component of the present invention sets up compared with traditional APC circuit, although bright dipping, receiptsThe stability of light decreases, and can not transmit the signal of higher rate, but can transmit the signal of low rate,Or even direct current signal, this optical module structure of the present invention is simple, and power consumption is lower, does not have low-frequency cutoffProblem, the low frequency DC that can work. Like this, even if the low-frequency data of equipment end does not carry out scrambler, also canTransmit smoothly, simplified the software and hardware configuration of equipment end.
Further, described light source drive, described temperature compensation unit also connect micro-control unit, described inThe temperature value information that micro-control unit sends for receiving described temperature compensation unit, optical drive unit sendsLight source drive current.
Further, the signal input part of described light emission module is provided with Transistor-Transistor Logic level signaling interface.
In existing technology, module, by adding level shifted signal at host end, realizes single-ended TTL signal,But increase circuit complexity, meanwhile, existing this scheme, its chip can not well be supported low frequency letterNumber transmission, carrying out low frequency signal modulation, separate timing and have the problem of Duty Cycle Distortion.
The two transmitting of a kind of low rate DC-20Mbps of the present invention SFP optical module is by the letter at light emission moduleNumber input arranges Transistor-Transistor Logic level signaling interface, and transmitting terminal chip can be worked under low rate state,Circuit structure of the present invention is simpler compared to existing technology, has overcome asking of optical signal Duty Cycle Distortion simultaneouslyTopic, owing to not needing to increase extra level conversion, the solution of the present invention cost is lower.
In a specific embodiment, referring to Fig. 2, transmitter module adopts single-ended input, and signal level isTTL, is coupled to light source drive through DC, and light source drive driving light source sends 0/1 signal, and temperature is mendedRepay unit the temperature of optical module is detected, the result feedback of detection is returned to power control unit, power controlUnit processed carries out power back-off according to temperature-compensating condition to light source, controls light source drive drive current, realReveal optical power adjustment, maintain out light power stabilising function. Micro-control unit is established by I2C bus and outsideStandby communication, simultaneously operating temperature, modular power source voltage, the two-way transmitting terminal transmitting power, two of monitoring moduleRoad transmitting terminal bias current. Module possesses DDM function, with the communication function of equipment and software to moduleControl function. In use, terminal device by with the communicating by letter of multiple modules, can be real-time obtain eachThe work state information of module, comprises transmitting power, the light transmitting of light transmission channel one and light transmission channel twoThe temperature of the bias current of passage one and light transmission channel two, supply voltage value, inside modules and module are alertAccuse and warning information, can find in time to occur so abnormal module. It is right to realize by software simultaneouslyThe control of module, to there being abnormal module to process in time. Micro-control unit is only realized module parameterMonitoring effect, if do not need DDM function, can directly remove micro-control circuit part and not affect light and send outPenetrate the normal work of unit.
Further, described light source is any in VCSEL, FP, DFB or LED.
Further, the Tx_fault pin of described optical module, Rate_select pin are set up respectivelyFor the pin for subsequent use of described two light emission module transmitting terminal Data Input Interfaces.
In a specific embodiment, referring to Fig. 3, Fig. 3 is the pipe in a specific embodiment of the present inventionPin definition, table 1 is described in detail the pin in Fig. 3, pinout originating data of the present inventionInput TD1, TD2 use single-ended signal, and wherein Pin13 and Pin18 draw as the input of two-way originating dataPin, Pin7 or Pin2 can be used as two-way originating data input pin for subsequent use, and data type is TTL.As special applications product, compared with traditional SFP pin definitions, Pin2Tx_fault and Pin7Rate_select function does not need, thus this two pin is used as signal pins for subsequent use, according to the present inventionDesign, the register definitions of modules A 2h also needs to revise accordingly on the basis of 8472 agreements,Concrete amendment adjustment is referring to table 2.
Table 1
Table 2
Because the present invention is provided with a pair of input pin that transmits for subsequent use, external equipment can be met diversifiedDesigning requirement, realizes the transmitting in two-channel independent source by the pin that transmits for subsequent use in the present embodiment.
Definition of pin position of the present invention meets MSA, can make standardized product, also can adopt special definition of pin position,The multiplexed port of realization and standard SFP product, effectively improves FU area panel utilization rate.
The tx_fault of the two transmitting of a kind of low rate DC-20Mbps of the present invention SFP optical module to SFP pinPin and Rate_select pin are re-set as two paths of signals input pin for subsequent use, have further improvedThe reliability of transfer of data.
By reference to the accompanying drawings the specific embodiment of the present invention is had been described in detail above, but the present invention does not limitBe formed on above-mentioned embodiment, in the spirit and scope situation of claim that does not depart from the application, this areaTechnical staff can make various amendments or remodeling.
Claims (6)
1. the two transmitting of a low rate DC-20Mbps SFP optical module, is characterized in that bagDraw together microcontroller, identical two light emission modules, described two Optical Transmit Units all connect instituteState micro-control unit, described light emission module comprises temperature compensation unit, light source drive, lightSource;
Described light source drive connects described light source, described in driving according to light source drive currentLight source bright dipping;
Described temperature compensation unit connects described light source drive, described light source, for detection of instituteState optical module current temperature value, according to the size of described temperature value, the luminous power that goes out of optical module is enteredRow compensation, control light source drive sends to the drive current size of light source, to adjust light transmittingPower.
2. the two transmitting of a kind of low rate DC-20Mbps according to claim 1 SFP lightModule, is characterized in that, described light source drive circuit adopts discrete circuit, and adopts DCCoupled modes connect.
3. the two transmitting of a kind of low rate DC-20Mbps according to claim 1 SFP lightModule, is characterized in that, described light source drive, described temperature compensation unit also connect micro-controlUnit processed, the temperature value letter that described micro-control unit sends for receiving described temperature compensation unitBreath, the light source drive current that optical drive unit sends.
4. the two transmitting of a kind of low rate DC-20Mbps according to claim 1 SFP lightModule, is characterized in that, the signal input part of described light emission module is provided with Transistor-Transistor Logic level letterNumber interface.
5. the two transmitting of a kind of low rate DC-20Mbps according to claim 1 SFP lightModule, is characterized in that, described light source is any in VCSEL, FP, DFB or LED.
6. send out according to a kind of low rate DC-20Mbps described in claim 1-5 any one is twoPenetrate SFP optical module, it is characterized in that, the Tx_fault pin of described optical module,Rate_select pin is set to respectively described two light emission module transmitting terminal data inputThe pin for subsequent use of interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162656.2A CN105610515A (en) | 2016-03-21 | 2016-03-21 | Low rate DC-20Mbps double-emission SFP optical module |
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| CN201610162656.2A CN105610515A (en) | 2016-03-21 | 2016-03-21 | Low rate DC-20Mbps double-emission SFP optical module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253991A (en) * | 2016-09-19 | 2016-12-21 | 成都新易盛通信技术股份有限公司 | The transceiver of low rate, double receipts and double SFF optical modules |
| CN111953422A (en) * | 2020-08-17 | 2020-11-17 | 西安微电子技术研究所 | Parallel light emitting circuit |
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| CN205430255U (en) * | 2016-03-21 | 2016-08-03 | 成都新易盛通信技术股份有限公司 | Two transmission SFP optical modules of low rate DC -20Mbps |
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Patent Citations (7)
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| CN2935643Y (en) * | 2006-08-09 | 2007-08-15 | 华为技术有限公司 | Double transmission select receiving device for optical module |
| CN102801475A (en) * | 2012-08-08 | 2012-11-28 | 青岛海信宽带多媒体技术有限公司 | Single-fiber bidirectional optical assembly and dual-transmitter dual-receiver optical module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253991A (en) * | 2016-09-19 | 2016-12-21 | 成都新易盛通信技术股份有限公司 | The transceiver of low rate, double receipts and double SFF optical modules |
| CN111953422A (en) * | 2020-08-17 | 2020-11-17 | 西安微电子技术研究所 | Parallel light emitting circuit |
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