CN101854211A - High-speed single-fiber bidirectional optical module - Google Patents
High-speed single-fiber bidirectional optical module Download PDFInfo
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- CN101854211A CN101854211A CN201010195619A CN201010195619A CN101854211A CN 101854211 A CN101854211 A CN 101854211A CN 201010195619 A CN201010195619 A CN 201010195619A CN 201010195619 A CN201010195619 A CN 201010195619A CN 101854211 A CN101854211 A CN 101854211A
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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+10GEPONONU optical module.
Background technology
The demand of using 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 1GEPON scheme simultaneously.
In optical module is used, have and detect the estimated value that optical output power can provide the optical transmitting set average power for the module user, 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 for 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 as follows: 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; Described burst type laser driver is connected with laser, and laser is provided with photodiode dorsad, is provided with dorsad the photodiode control circuit of taking a sample/keep in burst type laser driver inside; Described microcontroller obtains laser optical power in real time by the control circuit of taking a sample/keep of photodiode dorsad, is that laser affords redress by laser bias voltage electric current and modulated current and avalanche photodide bias voltage.By real-Time Compensation, make high-speed single-fiber bidirectional optical module can be operated under the total temperature environment.
According to embodiments of the invention, described 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 receiving end signal by the limiting amplifier that has the clock signal restore funcitons.Owing to adopt limiting amplifier, can satisfy 10GEPON to the requirement of receiving end signal output jitter with frequency and signal restore funcitons.
According to the embodiment of the invention, described microcontroller is realized the total temperature compensation by look-up table.Its look-up table is as follows: 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 by consulting the form of microcontroller inside; If there is not corresponding temperature in the table of controller, can utilizes the interior adjacent temperature of microcontroller table to do linear interpolation and do compensation.Do compensation by 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 by 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 by employing, and collocation is to high-frequency signals line impedence control on the circuit board, can satisfy 10GEPON well to the requirement of receiving 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 be because of the strong and weak ONU receiving end signal output quality that influences of descending smooth signal.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is SFP+10GEPONONU 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 receiving end circuit diagram 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 (10GLIA) 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 (CDRRetime) 34, receiving end signal (RXD) 35 dorsad.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
SFP+10GEPONONU 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 (10GLIA) 5 and SFP+ connector 6 as shown in Figure 1; Wherein burst type laser driver 1, microcontroller 2 and limiting amplifier 5 are connected with SFP+ connector 6 respectively, communicate by 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 (10GLIA) 5 respectively, by the work of microcontroller 2 control burst type laser drivers 1, single fiber bi-directional optical device (BOSA) 3 and limiting amplifier (10GLIA) 5; 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 by optical fiber.
Burst type laser driver 1 is used to drive single fiber bi-directional optical device 3, and burst type laser driver 1 converts TxData to the light signal and reaches the local side optical line terminator (OLT OpticalLineTerminal), and is started by burst signal (Tx_BRST) control.With the 10GEPONSFP+ optical module is example, its frame principles figure is as shown in Figure 1: 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 10GEPONONU optical module and physical layer.
The microcontroller look-up table is implemented as follows: at first, record under the total temperature offset of laser.Such as total temperature be-20-85oC, (such as 3oC) records offset under each temperature respectively at certain intervals in this temperature range, and the offset of each temperature and the correspondence that records is stored in microcontroller inside as a table.Secondly, when real-time working, obtain the temperature of laser in real time,, thereby obtain the offset under this temperature then by consulting the form of microcontroller inside.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, the adjacent temperature of temperature T is T1 and T2 in the acquisition table, and obtain corresponding offset and be respectively DAC1 and DAC2, utilize linear interpolation can obtain MT constantly, temperature is that the offset of T correspondence 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 the photodiode control circuit 23 of taking a sample/keep is arranged on burst type laser driver inside dorsad.When the burst of making a start is opened (Tx_BRSTenable), 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 be 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 finished 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 by representing the laser Output optical power by the VPD that samples.
Optical module among the present invention has the limiting amplifier of frequency and signal restore funcitons, to satisfy 10GEPON to the requirement of receiving end signal output jitter.As shown in Figure 3, microcontroller 2 is lost (LOS) circuit 32, limiting amplifier 5, clock signal restorer (CDRRetime) 34, receiving end signal (RXD) 35 and is connected successively with light signal; Microcontroller 2 is connected successively with avalanche photo diode (APD) bias control circuit 4,1577nm avalanche photo diode (APD) receiver 31, transimpedance amplifier (TIA) 33, limiting amplifier (LIA) 5.1577nm 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 receiving end signal (RXD) output by the limiting amplifier (LIA) that has clock signal restore funcitons (CDRRetime).
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 described burst type laser driver is connected with laser, laser is provided with photodiode dorsad, is provided with dorsad the photodiode control circuit of taking a sample/keep in burst type laser driver inside; Described microcontroller obtains laser optical power in real time by the control circuit of taking a sample/keep of photodiode dorsad, is that laser affords redress by 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: described 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 receiving end signal by 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: described microcontroller is realized the total temperature compensation by 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104158593A (en) * | 2014-08-27 | 2014-11-19 | 索尔思光电（成都）有限公司 | Method, circuit and equipment of processing LOS (Line of Sight) signal and eliminating oscillation |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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2010
- 2010-06-09 CN CN2010101956194A patent/CN101854211B/en active Active
Patent Citations (2)
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104158593A (en) * | 2014-08-27 | 2014-11-19 | 索尔思光电（成都）有限公司 | Method, circuit and equipment of processing LOS (Line of Sight) signal and eliminating oscillation |
| 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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| CN101854211B (en) | 2012-12-26 |
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