CN103595486A - Burst-mode low-jitter optical transceiver module and operation method thereof - Google Patents
Burst-mode low-jitter optical transceiver module and operation method thereof Download PDFInfo
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- CN103595486A CN103595486A CN201310565514.7A CN201310565514A CN103595486A CN 103595486 A CN103595486 A CN 103595486A CN 201310565514 A CN201310565514 A CN 201310565514A CN 103595486 A CN103595486 A CN 103595486A
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Abstract
The invention discloses a burst-mode low-jitter optical transceiver module. The burst-mode low-jitter optical transceiver module comprises an optical transmitting module and an optical receiving module. The input end of a single-ended-to-differential conversion unit of the optical transmitting module is connected with a burst-mode signal input externally, and the output end of the single-ended-to-differential conversion unit is connected with the input end of a laser drive unit. The output end of the laser drive unit is connected with the input end of a light-operated unit. The output end of the light-operated unit is connected with the control end of the laser drive unit through the light-operated unit. The output end of a laser of the optical receiving module is opposite to the input end of a laser detector. The output end of the laser detector is connected with the input end of a pre-amplifying unit. One output end of the pre-amplifying unit is directly connected with one input end of a judging unit, and the other output end of the pre-amplifying unit is connected with the other input end of the judging unit through a peak detection unit. The output end of the judging unit outputs the burst-mode signal. By the adoption of the burst-mode low-jitter optical transceiver module, the burst-mode signal can be directly converted to an optical signal to be transmitted, so that signal transmission jitter is reduced.
Description
Technical field
The present invention relates to a kind of optical module, be specifically related to a kind of burst type low jitter optical module and operation method thereof.
Background technology
At some specific areas, need to transmit with optical fiber the burst digital signal of 0～40Mbps bandwidth, sort signal has uncertain factor, most of the time is low level, when only having only a few, there will be one or several high level, sort signal is that the clock of synchronizeing with signal is not provided, and this signal requires highlyer to shake in addition, at the rising edge of pulse, requires shake to be less than or equal to 3ns.
Optical module is mainly divided into high-speed optical module and low speed optical module at present.Present low speed optical module on the market mainly concentrates within the scope of 0～2Mbps, only has indivedual producers can accomplish 0～10Mbps, still, for the application of some special dimensions, needs wider transmission bandwidth, and these low speed optical modules cannot meet the demands.High-speed optical module generally all needs digital signal process 8B/10B encoding and decoding to reduce signal DC characteristic, because the signal of required transmission does not provide synchronised clock, as carried out 8B/10B encoding and decoding with asynchronous clock sampling, will certainly increase signal jitter, adopt on the market at present high-speed optical module to transmit 0～40Mbps signal and be asynchronous-sampling method, its shake generally, more than 8ns, is therefore transmitted 0～40Mbps signal with high-speed optical module and also cannot be met the demands.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of burst type low jitter optical module and operation method thereof, and it can directly become light signal by burst and transmits, to reduce signal transmission shake.
For addressing the above problem, the present invention is achieved by the following technical solutions:
A low jitter optical module, comprises light emission module and Optical Receivers; Wherein
Described light emission module is mainly by single-ended variation subdivision, laser driver element, optical control element and laser constitution; The input of single-ended variation subdivision connects the burst type signal of outside input, the input of the output connecting laser driver element of single-ended variation subdivision, the output of laser driver element connects the input of optical control element, and the output of optical control element is through the control end of optical control element connecting laser driver element;
Described Optical Receivers is mainly comprised of laser detector, front unit, peak detection unit and the decision unit put; The output of laser is relative with the input of laser detector, and the output of laser detector is put the input of unit before connecting; Before put unit an output directly connect an input of decision unit, front another output of putting unit connects another input of decision unit through peak detection unit; The output of decision unit is outwards exported burst type signal.
In such scheme, described decision unit is high-speed comparator.
In such scheme, before described, put unit and comprise automatic gain control circuit and current-to-voltage converting circuit, wherein the input of automatic gain control circuit connects the input of laser detector, the output of automatic gain control circuit connects the input of current-to-voltage converting circuit, and the output of current-to-voltage converting circuit connects respectively peak detection unit and decision unit.
An operation method for burst type low jitter optical module, comprises the steps:
(1) single-ended variation subdivision becomes the burst type signal of outside input the differential signal of single spin-echo;
(2) differential signal is luminous through laser drive unit drives laser; When the signal of outside input is low level, laser driver element sends cut-off signals to laser, controls laser shutdown; When the signal of outside input is high level, laser driver element sends luminous signal to laser, controls laser luminous;
(3) output current of optical control element detection laser, and according to the size of this output current, regulate the drive current of laser, make the drive current of laser as far as possible stable;
(4) laser detector receives the light signal that laser sends in real time, and the light signal receiving is converted into before current signal is sent into and is put in unit;
(5) the front unit of putting amplifies the low current signal of laser detector output, and is transformed into voltage signal output;
(6) peak detection unit is put the peak value of unit output voltage signal before detecting, and this crest voltage is done and given decision unit after suitable maintenance as with reference to voltage signal;
(7) reference voltage signal that decision unit is exported the voltage signal of front putting unit output and peak detection unit compares, and outwards exports burst type signal.
In such scheme, the low level span described in step (2) is [+0.8V, 0V]; The span of high level is [+2V ,+3.6V].
The present invention is mainly used in 0～40Mbps and the burst digital data transmission of high bandwidth more, common application comprises clock signal, pulse signal, burst control signal, these signals are because the cycle is uncertain, have very strong DC characteristic, require very high to shake, with traditional optical module, cannot directly transmit, by the present invention, can directly transmit these signals.
Compared with prior art, advantage of the present invention is: 1, solved 0～40Mbps bandwidth and more the burst of high bandwidth transmission problem, without 8B/10B encoding and decoding; 2, transmission shake is less than 3ns, delay is less; 3, this module is easy to realization, cost is low.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of burst type low jitter optical module.
Embodiment
A low jitter optical module, comprises light emission module and Optical Receivers.As shown in Figure 1.
Described light emission module is mainly by single-ended variation subdivision, laser driver element, optical control element and laser constitution.The input of single-ended variation subdivision connects the burst type signal of outside input, the input of the output connecting laser driver element of single-ended variation subdivision, the output of laser driver element connects the input of optical control element, and the output of optical control element is through the control end of optical control element connecting laser driver element.In order to improve signal rising edge and trailing edge time, the laser that the preferred embodiment of the present invention adopts drives as differential driving mode, and the burst type signal of outside input is LVTTL signal, need to LVTTL single-ended signal be become to differential signal with single-ended variation subdivision and carry out drive laser.
Described Optical Receivers is mainly comprised of laser detector, front unit, peak detection unit and the decision unit put.The output of laser is relative with the input of laser detector, and the output of laser detector is put the input of unit before connecting.Before put unit an output directly connect an input of decision unit, front another output of putting unit connects another input of decision unit through peak detection unit.The output of decision unit is outwards exported burst type signal.In the preferred embodiment of the present invention, before described, put unit and comprise automatic gain control circuit and current-to-voltage converting circuit, wherein the input of automatic gain control circuit connects the input of laser detector, the output of automatic gain control circuit connects the input of current-to-voltage converting circuit, and the output of current-to-voltage converting circuit connects respectively peak detection unit and decision unit.Described decision unit is high-speed comparator.
0～40Mbps burst of outside input is LVTTL level, through single-ended variation subdivision, signal is become to the differential signal of single spin-echo.Differential signal is luminous through laser drive unit drives laser, and when the signal of outside input is low level (representative value is 0V), laser shutdown is not luminous; When the signal of outside input is high level (representative value is+3.3V), laser is luminous.The electric current of the Pd output of optical control element detection laser, increases or reduces the drive current of drive circuit for laser, to reach light-operated object according to the size of current detecting.Before put unit the weak current of laser detector output amplified, the electric current of laser detector output is become to Voltage-output.Peak detection unit is put the voltage peak of unit output before detecting, and does suitable maintenance, to decision unit, provides judgement foundation.Decision unit will front be put the voltage of unit output and the voltage of peak detection unit output compares, output LVTTL level signal.
The operation method of a kind of burst type low jitter optical module that above-mentioned optical module is realized, comprises the steps:
(1) signal that single-ended variation subdivision is LVTTL level by the burst type signal of outside input becomes the differential signal of single spin-echo.
(2) differential signal is luminous through laser drive unit drives laser.When the signal of outside input is low level (representative value is 0V), laser driver element sends cut-off signals to laser, controls laser shutdown.When the signal of outside input is high level (representative value is+3.3V), laser driver element sends luminous signal to laser, controls laser luminous.Generally be more than or equal to+2V of high level and be less than or equal to+3.6V, low level is generally less than equal+0.8V and is more than or equal to 0V.
(3) output current of optical control element detection laser, and according to the size of this output current, regulate the drive current of laser, make the drive current of laser as far as possible stable, thereby reach the effect that makes optical output power of laser stable.
(4) laser detector receives the light signal that laser sends in real time, and the light signal receiving is converted into before current signal is sent into and is put in unit.
(5) the front unit of putting amplifies the low current signal of laser detector output, and is transformed into voltage signal output.Before put inside, unit and there is automatic gain and control (AGC) circuit and current/voltage conversion (I/V) circuit.Agc circuit effectively regulates gain amplifier.Current/voltage conversion (I/V) circuit completes I/V to be changed, and the current transitions of laser detector output is become to voltage signal output.
(6) peak detection unit is put the peak value of unit output voltage signal before detecting, and this crest voltage is done and given follow-up decision unit after suitable maintenance as with reference to voltage signal.
(7) reference voltage signal that decision unit is exported the voltage signal of front putting unit output and peak detection unit compares, and outwards exports the signal that burst type signal is LVTTL level.
Claims (5)
1. burst type low jitter optical module, comprises light emission module and Optical Receivers; It is characterized in that:
Described light emission module is mainly by single-ended variation subdivision, laser driver element, optical control element and laser constitution; The input of single-ended variation subdivision connects the burst type signal of outside input, the input of the output connecting laser driver element of single-ended variation subdivision, the output of laser driver element connects the input of optical control element, and the output of optical control element is through the control end of optical control element connecting laser driver element;
Described Optical Receivers is mainly comprised of laser detector, front unit, peak detection unit and the decision unit put; The output of laser is relative with the input of laser detector, and the output of laser detector is put the input of unit before connecting; Before put unit an output directly connect an input of decision unit, front another output of putting unit connects another input of decision unit through peak detection unit; The output of decision unit is outwards exported burst type signal.
2. burst type low jitter optical module according to claim 1, is characterized in that: described decision unit is high-speed comparator.
3. burst type low jitter optical module according to claim 1, it is characterized in that: before described, put unit and comprise automatic gain control circuit and current-to-voltage converting circuit, wherein the input of automatic gain control circuit connects the input of laser detector, the output of automatic gain control circuit connects the input of current-to-voltage converting circuit, and the output of current-to-voltage converting circuit connects respectively peak detection unit and decision unit.
4. the operation method of realizing based on burst type low jitter optical module claimed in claim 1, is characterized in that comprising the steps:
(1) single-ended variation subdivision becomes the burst type signal of outside input the differential signal of single spin-echo;
(2) differential signal is luminous through laser drive unit drives laser; When the signal of outside input is low level, laser driver element sends cut-off signals to laser, controls laser shutdown; When the signal of outside input is high level, laser driver element sends luminous signal to laser, controls laser luminous;
(3) output current of optical control element detection laser, and according to the size of this output current, regulate the drive current of laser, make the drive current of laser as far as possible stable;
(4) laser detector receives the light signal that laser sends in real time, and the light signal receiving is converted into before current signal is sent into and is put in unit;
(5) the front unit of putting amplifies the low current signal of laser detector output, and is transformed into voltage signal output;
(6) peak detection unit is put the peak value of unit output voltage signal before detecting, and this crest voltage is done and given decision unit after suitable maintenance as with reference to voltage signal;
(7) reference voltage signal that decision unit is exported the voltage signal of front putting unit output and peak detection unit compares, and outwards exports burst type signal.
5. the operation method of burst type low jitter optical module according to claim 4, is characterized in that: the low level span described in step (2) is [+0.8V, 0V]; The span of high level is [+2V ,+3.6V].
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Citations (4)
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| JP2004336200A (en) * | 2003-05-01 | 2004-11-25 | Matsushita Electric Ind Co Ltd | Burst signal start detection circuit, optical receiver, and optical transmission system |
| US20090238226A1 (en) * | 2008-03-19 | 2009-09-24 | Sumitomo Electric Industries, Ltd. | Driver circuit for semiconductor laser diode driven in differential mode |
| CN102771065A (en) * | 2010-02-15 | 2012-11-07 | 日本电信电话株式会社 | Optical signal turn-off detection circuit and optical receiver |
| CN203851146U (en) * | 2013-11-14 | 2014-09-24 | 中国电子科技集团公司第三十四研究所 | Bursting type low-jitter light module |
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- 2013-11-14 CN CN201310565514.7A patent/CN103595486A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004336200A (en) * | 2003-05-01 | 2004-11-25 | Matsushita Electric Ind Co Ltd | Burst signal start detection circuit, optical receiver, and optical transmission system |
| US20090238226A1 (en) * | 2008-03-19 | 2009-09-24 | Sumitomo Electric Industries, Ltd. | Driver circuit for semiconductor laser diode driven in differential mode |
| CN102771065A (en) * | 2010-02-15 | 2012-11-07 | 日本电信电话株式会社 | Optical signal turn-off detection circuit and optical receiver |
| CN203851146U (en) * | 2013-11-14 | 2014-09-24 | 中国电子科技集团公司第三十四研究所 | Bursting type low-jitter light module |
Non-Patent Citations (3)
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| YE LIN等: "A 10Gb/s Burst-Mode Laser Diode Driver for IEEE 802.3av 10G-EPON Applications", 《FUTURE NETWORKS, 2010. ICFN"10. SECOND INTERNATIONAL CONFERENCE ON》 * |
| 杨孝平: "突发模式光发射和时钟技术研究", 《中国优秀博硕士学位论文全文数据库（硕士）信息科技辑》 * |
| 王红霞: "GPON系统突发模式发射机与接收机的研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
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Application publication date: 20140219 |