CN101854211B - High-speed single-fiber bidirectional optical module - Google Patents
High-speed single-fiber bidirectional optical module Download PDFInfo
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- CN101854211B CN101854211B CN2010101956194A CN201010195619A CN101854211B CN 101854211 B CN101854211 B CN 101854211B CN 2010101956194 A CN2010101956194 A CN 2010101956194A CN 201010195619 A CN201010195619 A CN 201010195619A CN 101854211 B CN101854211 B CN 101854211B
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Abstract
The invention discloses a high-speed single-fiber bidirectional optical module comprising a burst laser driver, a microcontroller, a single-fiber bidirectional optical member, an avalanche photodiode bias control circuit, a limiting amplifier and SFP(Screen Filter Pressure)+ connector, wherein the burst laser driver, the microcontroller and the limiting amplifier are respectively connected with the SFP+ connector and communicated with a host computer through the SFP+ connector; the microcontroller is respectively connected with the burst laser driver and the limiting amplifier; and the single-fiber bidirectional optical member is connected between the burst laser driver and the limiting amplifier. The invention has the advantages of reducing the design cost, decreasing the complexity of circuit design and well meeting the requirement of outputting shake to receiving end signals by 10GEPON. The invention can provide low shake signal output with the same quality when inputting at different optical signal strength without influencing the output quality of ONU (Optical Network Unit) receiving end signals because of the intensity of downlink optical signals.
Description
Technical field
the present invention relates to 10G Ethernet passive optical network (10GEPON) technology, particularly relate to a kind of high-speed single-fiber bidirectional SFP+ 10G EPON ONU optical module.
Background technology
The demand that use bandwidth along with next generation network
constantly increases, and these application comprise high definition IPTV broadcasting and multimedia delivery system etc., its bandwidth demand head and shoulders above current access technology the maximum bandwidth that can provide.Therefore, 10G Ethernet passive optical network (10GEPON) technology is an attractive solution, can coexist as same fiber optic network with existing 1G EPON scheme simultaneously.
have and detect the estimated value that optical output power can provide the optical transmitting set average power for the module user in optical module is used, with this as diagnosis basis, to guarantee the module operate as normal.In traditional continuous mode optical transmitting set was used, the numerical value of optical power detector was to stem from being installed on the electric current of the photodiode dorsad (MPD) on the laser driver.This electric current and reflector optical output power are approximated to proportional relation.Yet only conducting in the relatively short time cycle of laser in burst mode is used; And the length of the time that at every turn happens suddenly is also inequality; This as far as bandwidth compared to the little photodiode of laser modulation bandwidth; And can't in time reflect the actual luminous power of making a start, and increased the degree of difficulty that luminous power detects in the burst mode application.
Summary of the invention
the present invention has overcome shortcoming of the prior art, and a kind of high-speed single-fiber bidirectional optical module is provided.
technical scheme of the present invention is following: a kind of high-speed single-fiber bidirectional optical module comprises burst type laser driver, microcontroller, single fiber bi-directional optical device, avalanche photodide bias control circuit, limiting amplifier and SFP+ connector; Said burst type laser driver is connected with laser, and laser is provided with photodiode dorsad, in burst type laser driver set inside the photodiode control circuit of taking a sample/keep is arranged dorsad; Said microcontroller obtains laser optical power in real time through the control circuit of taking a sample/keep of photodiode dorsad, is that laser affords redress through laser bias voltage electric current and modulated current and avalanche photodide bias voltage.Through real-Time Compensation, make high-speed single-fiber bidirectional optical module can be operated under the total temperature environment.
are according to embodiments of the invention; Said single fiber bi-directional optical device comprises the avalanche photodide receiver; The avalanche photodide receiver comprises transimpedance amplifier; Be used to provide the high speed optoelectronic conversion, the local side light signal that receives is changed into the small voltage signal, and the signal shaping is amplified to the output of receipts end signal through the limiting amplifier that has the clock signal restore funcitons.Owing to adopt limiting amplifier, can satisfy 10G EPON to receiving the requirement of end signal output jitter with frequency and signal restore funcitons.
according to the embodiment of the invention, said microcontroller is realized the total temperature compensation through look-up table.Its look-up table is following: at first, record under the total temperature offset of laser; Secondly, when real-time working, obtain the temperature of laser in real time,, thereby obtain the offset under this temperature then through consulting the inner form of microcontroller; If there is not corresponding temperature in the table of controller, can utilizes in the microcontroller table adjacent temperature to do linear interpolation and do compensation.Do compensation through interpolation, precision can afford redress.
compared with prior art; Advantage of the present invention is: the burst type laser driver that has the characteristic of taking a sample/keep through employing is sampled to photodiode electric current dorsad; The circuit that control is formed with microcontroller IC realizes that luminous power detects the digital supervision function; Need increase a high-speed analog switch and electric capacity compared with traditional outer samples/holding circuit; This design not only reduces design cost and has also reduced the complex circuit designs degree, and microcontroller also can see through external interrupt service routine Auto-Sensing transmitter real-time status and export the external electric interface to; The present invention also has the limiting amplifier of frequency and signal restore funcitons through employing; And collocation is to high-frequency signals line impedence control on the circuit board; Can satisfy 10G EPON well to receiving the requirement of end signal output jitter; The low jitter signal output of equal in quality can be provided under the signal strength input of not sharing the same light, therefore, can not influence ONU because of descending smooth signal is strong and weak and receive end signal output quality.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is SFP+ 10G EPON ONU optical module frame principles figure;
Fig. 2 is that burst mode has average T X power detector and the circuit structure diagram of the state indication of making a start;
Fig. 3 adopts the receipts terminal circuit figure with low jitter output signal;
burst type laser driver 1, microcontroller 2, single fiber bi-directional optical device 3, avalanche photo diode (APD) bias control circuit 4, limiting amplifier (10G LIA) 5, connector 6, photodiode (MPD) 21 dorsad, laser 22, photodiode take a sample/keep control circuit 23,1577nm avalanche photo diode (APD) receiver 31, light signal lost (LOS) circuit 32, transimpedance amplifier (TIA) 33, clock signal restorer (CDR Retime) 34, received end signals (RXD) 35 dorsad.
Embodiment
Disclosed all characteristics in
this specification, or the step in disclosed all methods or the process except mutually exclusive characteristic and/or the step, all can make up by any way.
Disclosed arbitrary characteristic in
these specifications (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
SFP+ 10G EPON ONU as shown in Figure 1 optical module frame principles figure comprises burst type laser driver 1, microcontroller 2, single fiber bi-directional optical device (BOSA) 3, avalanche photo diode (APD) bias control circuit 4, limiting amplifier (10G LIA) 5 and SFP+ connector 6; Wherein burst type laser driver 1, microcontroller 2 and limiting amplifier 5 are connected with SFP+ connector 6 respectively, communicate through SFP+ connector 6 and host computer; Microcontroller 2 is connected with burst type laser driver 1, single fiber bi-directional optical device (BOSA) 3 and limiting amplifier (10G LIA) 5 respectively, controls the work of burst type laser driver 1, single fiber bi-directional optical device (BOSA) 3 and limiting amplifier (10G LIA) 5 through microcontroller 2; Wherein single fiber bi-directional optical device (BOSA) 3 is connected between burst type laser driver 1 and the limiting amplifier 5, sends and receives information through optical fiber.
burst type laser driver 1 is used to drive single fiber bi-directional optical device 3; Burst type laser driver 1 converts TxData to the light signal and reaches local side optical line terminator (OLT; Optical Line Terminal), and by burst signal (Tx_BRST) control start.With 10G EPON SFP+ optical module is example; Figure is as shown in Figure 1 for its frame principles: comprise the single fiber bi-directional optical device (BOSA) that 1310nm laser and 1577nm avalanche photo diode (APD) receiver are formed, burst type laser driver 1 will provide laser bias voltage electric current and modulated current.Microcontroller utilizes the look-up table mode that total temperature laser bias voltage electric current and modulated current and avalanche photo diode (APD) slide-back are provided, can be in total temperature environment operate as normal to guarantee optical transceiver module.The SFP+ connector provides the communication that interconnects of 10G EPON ONU optical module and physical layer.
microcontroller look-up table is concrete to be realized as follows: at first, record under the total temperature offset of laser.Such as total temperature be-20-85oC, (such as 3oC) records the offset under each temperature respectively at certain intervals in this temperature range, and is stored in microcontroller inside to the offset of each temperature and the correspondence that records as a table.Secondly, when real-time working, obtain the temperature of laser in real time,, thereby obtain the offset under this temperature then through consulting the inner form of microcontroller.Such as the current time be MT; Obtain the work temperature of module (laser) in real time; The table of microcontroller storage inside is searched in utilization, and the adjacent temperature of temperature T is T1 and T2 in the acquisition table, and obtains corresponding offset and be respectively DAC1 and DAC2; Utilize linear interpolation can obtain MT constantly, temperature is that the corresponding offset of T is DACr=DAC1+ (T-T1) * (DAC2-DAC1)/(T2-T1).It should be noted that also and can adopt other interpolation method, such as quadratic interpolation etc.
Optical module among
the present invention can be indicated the luminous power in output and the burst mode application in real time.As shown in Figure 2, burst type laser driver 1 is connected with laser 22, and laser is provided with photodiode (MPD) 21 dorsad, and photodiode is taken a sample/kept dorsad, and to be arranged on the burst type laser driver inner for control circuit 23.When the burst of making a start is opened (Tx_BRST enable); Burst type laser driver 1 will be opened laser 22; And convert TxData to the light signal and be uploaded to optical line terminator; Simultaneously dorsad 21 pairs of laser 22 luminous powers of photodiode to carry out opto-electronic conversion be electric current, by resistance R 1 electric current is changed into voltage, the MPD input of burst type laser driver 1 can be taken a sample and be stored in inside and taken a sample/keep in the electric capacity the voltage on the resistance R 1; When burst was closed by the time, this voltage will export the A/D converter of microcontroller 2 from the MPD output of burst type laser driver to; Simultaneously it can produce a triggering signal (BRSTOUT) and starts microprocessor external interrupt service routine and begin to carry out voltage sampling, and microprocessor will be accomplished sampling in 100 microseconds, and sampled value is stored among the EEPROM.Because laser Output optical power intensity is directly proportional with photodiode electric current I PD dorsad, and the voltage VPD=IPD * R1 on the R1, so through representing the laser Output optical power through the VPD that samples.
Optical module among
the present invention has the limiting amplifier of frequency and signal restore funcitons, to satisfy 10G EPON to receiving the requirement of end signal output jitter.As shown in Figure 3, microcontroller 2 is lost (LOS) circuit 32, limiting amplifier 5, clock signal restorer (CDR Retime) 34, is received and hold signal (RXD) 35 to be connected successively with light signal; Microcontroller 2 is connected with avalanche photo diode (APD) bias control circuit 4,1577nm avalanche photo diode (APD) receiver 31, transimpedance amplifier (TIA) 33, limiting amplifier (LIA) 5 successively.1577nm avalanche photo diode (APD) receiver 31 comprises transimpedance amplifier (TIA) 33; Be used to provide the high speed optoelectronic conversion; To receive the light signal and change into the small voltage signal, and the signal shaping will be amplified to receipts end signals (RXD) output through the limiting amplifier (LIA) that has clock signal restore funcitons (CDR Retime).
microcontroller and APD bias control circuit will make APD can stable operation in the different operating temperature.The light signal that APD will receive converts current signal to and converts the small voltage signal to by transimpedance amplifier, and limiting amplifier further amplifies the small voltage signal.Electric signal after the amplification with signal shaping output, reaches the low jitter signal output that the signal strength input of not sharing the same light provides equal in quality down via the clock signal restorer.
the present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (3)
1. a high-speed single-fiber bidirectional optical module comprises burst type laser driver, microcontroller, single fiber bi-directional optical device, avalanche photodide bias control circuit, limiting amplifier and SFP+ connector; It is characterized in that said burst type laser driver is connected with laser, laser is provided with photodiode dorsad, in burst type laser driver set inside the photodiode control circuit of taking a sample/keep is arranged dorsad; Said microcontroller obtains laser optical power in real time through the control circuit of taking a sample/keep of photodiode dorsad, is that laser affords redress through laser bias voltage electric current and modulated current and avalanche photodide bias voltage.
2. high-speed single-fiber bidirectional optical module according to claim 1; It is characterized in that: said single fiber bi-directional optical device comprises the avalanche photodide receiver; The avalanche photodide receiver comprises transimpedance amplifier; Be used to provide the high speed optoelectronic conversion, the local side light signal that receives is changed into the small voltage signal, and the signal shaping is amplified to the output of receipts end signal through the limiting amplifier that has the clock signal restore funcitons.
3. high-speed single-fiber bidirectional optical module according to claim 1 and 2 is characterized in that: said microcontroller is realized the total temperature compensation through look-up table.
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| CN2010101956194A CN101854211B (en) | 2010-06-09 | 2010-06-09 | High-speed single-fiber bidirectional optical module |
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| CN2010101956194A CN101854211B (en) | 2010-06-09 | 2010-06-09 | High-speed single-fiber bidirectional optical module |
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| CN102255670A (en) * | 2011-07-13 | 2011-11-23 | 武汉电信器件有限公司 | Single-fibre two-way light module |
| CN103731209A (en) * | 2013-12-05 | 2014-04-16 | 国家电网公司 | Single-optical-fiber bidirectional communication method for high-voltage direct current transmission |
| CN104158593B (en) * | 2014-08-27 | 2016-11-30 | 索尔思光电（成都）有限公司 | A kind of process LOS signal and the method for oscillation-damped, circuit and equipment |
| CN109557623A (en) * | 2019-02-22 | 2019-04-02 | 深圳海荻威光电科技有限公司 | A kind of optical fiber receiver-transmitter module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512686A (en) * | 2002-12-26 | 2004-07-14 | 上海恒拓光电科技有限公司 | Simplified Ethernet passive optical network transmiter-receiver and method for its signal transmission |
| CN101447830A (en) * | 2008-12-26 | 2009-06-03 | 武汉电信器件有限公司 | Ethernet passive optical network (EPON) optical line terminal photoelectric module with digital supervision and reporting functions |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512686A (en) * | 2002-12-26 | 2004-07-14 | 上海恒拓光电科技有限公司 | Simplified Ethernet passive optical network transmiter-receiver and method for its signal transmission |
| CN101447830A (en) * | 2008-12-26 | 2009-06-03 | 武汉电信器件有限公司 | Ethernet passive optical network (EPON) optical line terminal photoelectric module with digital supervision and reporting functions |
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