CN100502260C - Burst mode light receiver, system and method - Google Patents
Burst mode light receiver, system and method Download PDFInfo
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- CN100502260C CN100502260C CNB2004100637514A CN200410063751A CN100502260C CN 100502260 C CN100502260 C CN 100502260C CN B2004100637514 A CNB2004100637514 A CN B2004100637514A CN 200410063751 A CN200410063751 A CN 200410063751A CN 100502260 C CN100502260 C CN 100502260C
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Abstract
A communication system includes an optical receiver used in receiving light signals and converting them into electronic signals, a trasimpedance amplifier (TIA) for filtering electronic signals, a limiting amplifier (LA), an automatic threshold control (ATC) for providing a reference voltage to the limiting amplifier, among which, the ATC also includes a ground-emitter circuit and an emitter follower circuit, the logic high signals in the electronic signals and logic low signals are got by comparing with the reference voltage provided by the ATC.
Description
Technical field
The invention relates to a kind of communication system, refer to a kind of burst mode light receiver, system and method especially.
Background technology
The receiver of light communication system can receive continuous transmission data (being continuous mode) or with the data of burst mode transmission (be a kind of transfer of data of un-encoded, wherein only have in Chuan Shu the data long string 0 or long go here and there 1).Figure 1A, Fig. 1 C reach the waveform schematic diagram of transfer of data warp under burst mode at continuous mode, and have a direct current bias voltage (DC offset) respectively.Fig. 1 C, 1D be continuous mode and under burst mode transfer of data through signal through ac filter waveform schematic diagram.The one interchange optical receiver that transmits data serially also can be used in the known communication system.
Can use the direct current optical receiver of burst mode transmission data also can be used in the known communication system.But the required data demodulates program of burst mode transmission can increase the complexity of system and lower the speed of transfer of data.Use in No. 5875050, be described in United States Patent (USP) respectively No. 5025456, No. 5371763, United States Patent (USP) of the example of the known communication system of burst mode transmission data and the United States Patent (USP).When some numerical data signals were received from a data channel (data channel), these signals can be fallen usually translated (degrade) one-tenth analog signal, and has the amplitude of uncertain size and be difficult for transfer characteristic between recognition logic 1 and the logical zero.When logical transition (logic transition) was not easy to identify, noise (noise) and pulse length distortion (pulse width distortion) will influence the performance of system sensitivity (sensitivity) and frequency range (bandwidth).
Therefore, in association area, need a system and a method to solve above-mentioned shortcoming, especially need a burst mode light receiver, system and method, so that overcome degradation (degradation) effect and the noise of burst mode transmission communication system and the effect of waveform distortion that signal takes place when its logical transition of decipher.
Summary of the invention
The object of the present invention is to provide a kind of burst mode light receiver, system and method, can solve because the restriction and the variety of issue that shortcoming causes of correlation technique.
For achieving the above object, a system provided by the invention comprises: an optical receiver, in order to receive the light signal and the light signal be converted to electric signal; One changes impedance amplifier (TIA), in order to the filtering electronic signal; One limiting amplifier (LA) has and changes first input and an automatic Critical Control device (ATC) that is connected with the commentaries on classics impedance amplifier that impedance amplifier is connected, imports so that a reference voltage to second of limiting amplifier to be provided.In addition, automatically the Critical Control device comprises that a common emitter portion and an emitter-base bandgap grading follow portion, and the logic high signal of electric signal and logic low-level signal are with the reference voltage comparison and get.
According to the present invention, a data transmission method comprises: receive the light signal; The convert light signal is an electric signal; The filtering electronic signal; Utilize a common emitter circuit and an emitter-base bandgap grading to follow circuit control one between the high position of electric signal and the critical voltage between the low level; And with respect to critical voltage, logic high signal and logic low-level signal in the decision electric signal.
According to another preferred embodiment of the present invention, one communication system with a passive smooth networking comprises: a burst mode light receiver, be converted to electric signal in order to the light signal of reception burst mode and with the light signal: one changes impedance amplifier, in order to the filtering electronic signal; One limiting amplifier that is connected with this commentaries on classics impedance amplifier; The one automatic Critical Control device that is connected with the commentaries on classics impedance amplifier is in order to provide a reference voltage to limiting amplifier.
In addition, automatically the Critical Control device comprises that also a common emitter portion and an emitter-base bandgap grading follow portion, and the logic high signal of electric signal and logic low-level signal are with the reference voltage comparison and get.
Characteristics that the present invention is extra and advantage will propose in following execution mode, and to a certain extent can be by obtaining understanding in its narration and the execution mode.Characteristics of the present invention and advantage can be further understood via element in the claim and marriage relation thereof.
Aforesaid summary narration of the present invention and follow-up being described in detail are all exemplary content and only for the usefulness of explaining the present invention, it is unrestricted content of the present invention also.Interest field of the present invention is as the criterion with claim.Accompanying drawing of the present invention is to cooperate content of the present invention and constitute partial content of the present invention, and cooperates narration of the present invention and preferred embodiment of the present invention to illustrate principle of the present invention.
Description of drawings
Figure 1A, Figure 1B, Fig. 1 C and Fig. 1 D are the waveform schematic diagrames of transfer of data under continuous mode and burst mode respectively.
Fig. 2 is a circuit diagram of describing a burst mode light receiver in the system of a preferred embodiment of the present invention.
Fig. 3 one has the transmission system schematic diagram of the burst mode light receiver of a preferred embodiment of the present invention.
Embodiment
For more understanding technology contents of the present invention, be described as follows especially exemplified by preferred embodiment of the present invention.
Fig. 2 is a circuit diagram of describing a burst mode light receiver in the system of a preferred embodiment of the present invention.Fig. 3 one has the transmission system schematic diagram of the burst mode light receiver of a preferred embodiment of the present invention, for example passive smooth networking.(at Fig. 3 is to comprise that with local side (office line terminal, OLT) 300 together show) one changes impedance amplifier 210, a limiting amplifier 220, one control switchs 230 and an automatic Critical Control device 240 to burst mode light receiver 200.Automatically Critical Control device 240 has also comprised transistor 242 and transistor 244, and constitutes a common emitter circuit and a coupled emitter-base bandgap grading is followed circuit.And resistance 246 and resistance 248 are connected with the collection utmost point and the emitter-base bandgap grading of transistor 242 respectively; Resistance 250 and resistance 252 are connected with the collection utmost point and the emitter-base bandgap grading of transistor 244 respectively.Resistance 246 and resistance 250 are connected in a supply voltage (supply voltage), and resistance 248 and resistance 252 is ground connection (ground) then.In addition, optical receiver 200 can be installed on one and has in wavelength divided multiplex (MUX) (WDM) function system.
See also Fig. 3, local side 300 is via a splitter (power splitter) 310, as star-type coupler (star coupler), with a plurality of smooth network unit or ONUs (N1, N2, N3, N4) connection.By an optical fiber cable 320 entrained data is that (time division multipleaccess, mode TDMA) is transmitted between splitter 310 and the local side 300 with the time division multiplexing access.Be transferred to descending (downstream) light signal transmission of ONUs and all can be implemented from local side 300 from up (upstream) light signal transmission that ONUs is transferred to local side 300.Up smooth signal transmission is that optical transmitting set (optical transmitter) and the wavelength divided duplexing equipment from ONUs transmits out, and via fine line 320 transmission of the individual fibers transmission line that is linked to each ONUs, splitter 310 and a common light, and these signals are to transmit via common optical fiber cable 320 with burst mode, and are positioned at optical receiver 200 receptions of local side 300 via another wavelength divided duplexing equipment (not shown).Optical receiver 200 receives from the burst mode signal of ONUs and is converted into electric signal.
Especially as shown in Figure 2, automatically the common emitter circuit in the Critical Control device 240 comprise have base stage, the transistor 242 of the collection utmost point and emitter-base bandgap grading, resistance 246 and 248, and and resistance 248 electric capacity 254 arranged side by side.The base stage of transistor 242 is to be connected with the negative output S-that changes impedance amplifier via resistance 256 in the common emitter circuit.Emitter-base bandgap grading in the automatic Critical Control device 240 is followed circuit and is comprised transistor 244, resistance 250 and the resistance 252 that has base stage, collects the utmost point and emitter-base bandgap grading, and the base stage of transistor 244 is connected with the collection utmost point and the electric capacity 254 of transistor 242.One direct current voltage source is connected in the PIN type diode 260 of a combining optical element, so that optical signal is converted to electric signal, for example one has the PIN type diode 260 that is series at the output of changeing impedance amplifier 210.The output S+ that changes impedance amplifier is connected via the limiting amplifier 220 that electric capacity 262 and one has a computing amplifier comparator (operational amplifier comparator), and the output S-of commentaries on classics impedance amplifier is connected with automatic Critical Control device 240 via resistance 256.Automatically the output of Critical Control device 240 is connected with limiting amplifier 220 and control switch 230 via electric capacity 264 and electric capacity 266 respectively, and control switch 230 is promptly accumulated voltage in electric capacity 266.Control switch 230 also comprises an operational amplifier 268.When signal was imported, control switch 230 was just opened limiting amplifier 220; And when not having the signal input, control switch 230 just cuts out limiting amplifier 220, to prevent voltage oscillation (voltageoscillation) and signal distortion (signal distortion) limiting amplifier is caused adverse effect.On the other hand, as control switch and a clock pulse (clock) and a data recovery circuit (data recoverycircuit, CDR) (phase-lock loop (phase lock loop for example, PLL) or delay-locked loop (delay lock loop, when DLL)) being connected, the function of (data recovery) replied system's time pulse signal in the may command optical receiver 200 (system clock signal) and data by control switch.
When a burst mode light receiver 200 receives the light signal via optical fiber cable 320 from ONUs after, PIN type diode 260 can be converted to electric signal with the light signal, and now changeing the output signal that impedance amplifier 210 is converted to low noise, and output signal S+ and output signal S-offer limiting amplifier 220 and automatic Critical Control device 240 respectively.When receiving burst mode light signal, via the output S-that changes impedance amplifier 210, it is also roughly identical with the voltage that changes impedance amplifier 210 output S-up to its voltage to 254 chargings of the electric capacity in the circuit that optical receiver 210 drives common emitter circuits, and emitter-base bandgap grading is followed circuit and can be prevented electric capacity 254 overcharge (overcharging).Therefore, emitter-base bandgap grading follow that circuit helps to slow down since the continuity high-frequency signals of optical receiver 200 input cause to the electric capacity adverse influence of charging.
Therefore, Critical Control device 240 is connected with the negative output S-that changes impedance amplifier and provides a critical voltage (threshold voltage) that is fit to supply to judge that the logic state of the electric signal representative that is converted by the light signal is 1 or 0 automatically.Automatically Critical Control device 240 is via second input of electric capacity 264 output one critical values (thresh01d value) to limiting amplifier 220.Limiting amplifier 220 can be selected suitable susceptibility and have magnitude of voltage 5mV or above signal so that only amplify.This critical value can be as a reference voltage of limiting amplifier 220 negative inputs, so that logical one and the logical zero of logic identification from the signal that changes impedance amplifier 210 and the transmission via electric capacity 262.Automatic Critical Control device 240 has guarantees that critical value can approach to import the intensity median of changeing impedance amplifier 210 signals, so that prevent the pulse length distortion of generation when logic output (logic output).
Preferred embodiment of the present invention can comprise a kind of data transmission method, and comprises that receiving light signal, convert light signal is electric signal, filtering electronic signal, utilizes common emitter circuit and emitter-base bandgap grading to follow circuit control one to determine logic high signal and logic low-level signal in the electric signal between the high position of electric signal and the critical voltage between the low level and based on this critical voltage.In addition, the method can be applicable to one and has with burst mode and transmit in the system at passive smooth networking of light signal.When the light signal was sent to optical receiver, the light signal can be the light signal of wavelength divided multiplex (MUX) (wavelength divisionmultiplexed).When the electric capacity in the common emitter circuit was recharged, control switch can prevent that electric capacity from being overcharged.
For having the people of general knowledge in field of the present invention, other embodiment of the present invention can be by understanding easily in the content of this specification and the execution mode.Only for the usefulness of explanation, right application content of the present invention is to be as the criterion with the claim of applying for for content of this specification and example.
Claims (19)
1. system comprises:
One optical receiver receives a smooth signal and this light signal is converted to an electric signal;
One changes impedance amplifier, filters this electric signal;
One limiting amplifier, have one with first importing that this commentariess on classics impedance amplifier couples; And
One automatic Critical Control device couples and provides one second input of a reference voltage to this limiting amplifier with this commentaries on classics impedance amplifier;
Wherein this automatic Critical Control device comprises that also a common emitter portion and an emitter-base bandgap grading follow portion, this common emitter portion have one and emitter-base bandgap grading follow the capacitor that couples between the portion, and with this electric signal to this capacitor charging; And wherein a logic high signal of this electric signal and a logic low-level signal and this reference voltage relatively get.
2. the system as claimed in claim 1 is characterized in that, wherein this optical receiver also comprises:
The direct voltage source of one ground connection;
One optical diode is connected with this voltage source and this light signal is converted to this electric signal.
3. the system as claimed in claim 1 is characterized in that, wherein the output that this common emitter portion is connected with a negative output of this commentaries on classics impedance amplifier and this limiting amplifier and this emitter-base bandgap grading are followed portion couples.
4. system as claimed in claim 3 is characterized in that, wherein also comprises a passive smooth networking of transmitting this light signal with burst mode.
5. the system as claimed in claim 1, it is characterized in that, comprise also that wherein one follows an output of portion and this control switch of coupling of second input of this limiting amplifier with this emitter-base bandgap grading, this control switch is used for according to whether receiving this electric signal this limiting amplifier of switch accordingly.
6. the system as claimed in claim 1, it is characterized in that, wherein this optical receiver comprises that also one has a switch of an operational amplifier, and this operational amplifier is coupled to this second input and this direct voltage source of this limiting amplifier, is coupled to a reference voltage simultaneously.
7. the system as claimed in claim 1 is characterized in that, comprises also that wherein one receives the common optical fiber cable that is connected in this difference device from the splitter and of the signal of a smooth network unit, in order to transmit this light signal to this optical receiver.
8. the system as claimed in claim 1, it is characterized in that, wherein this common emitter portion comprises that one has a common emitter circuit of a bipolar transistor, and this bipolar transistor has the resistance that a base stage, the collection utmost point and an emitter-base bandgap grading and this base stage and be series at a negative output of this commentaries on classics impedance amplifier and is connected.
9. the system as claimed in claim 1 is characterized in that, wherein this emitter-base bandgap grading portion of following comprises that an emitter-base bandgap grading with a bipolar transistor follows circuit, and this bipolar transistor has a base stage, a collection utmost point and an emitter-base bandgap grading and this base stage and this common emitter portion and couples.
10. the system as claimed in claim 1 is characterized in that, wherein this system also comprises the wavelength divided duplexing equipment of a smooth network unit and in order to this light signal multiplex (MUX) is handled.
11. a data transmission method comprises the following steps:
Receive a smooth signal;
Changing this light signal is an electric signal:
Filter this electric signal;
Utilize a common emitter circuit and an emitter-base bandgap grading to follow circuit control one between the high position of this electric signal and the critical voltage between the low level;
Electric capacity in this common emitter circuit is charged; And
With respect to this critical voltage, determine a logic high signal and a logic low-level signal in this electric signal.
12. method as claimed in claim 11 is characterized in that, comprises also that wherein one amplifies the also step of this electric signal of low-pass filter.
13. method as claimed in claim 11 is characterized in that, comprises also that wherein one transmits the step of this light signal with burst mode.
14. method as claimed in claim 11 is characterized in that, comprises also that wherein one provides the step of a control switch to prevent that the capacitor from overcharging.
15. the communication system with a passive smooth networking comprises:
One burst mode light receiver receives the light signal of a burst mode and this light signal is converted to an electric signal;
One changes impedance amplifier, filters this electric signal;
One limiting amplifier is connected with this commentaries on classics impedance amplifier: and
One automatic Critical Control device is connected with this commentaries on classics impedance amplifier and provides a reference voltage to this limiting amplifier;
Wherein this automatic Critical Control device comprises that also a common emitter portion and an emitter-base bandgap grading follow portion, this common emitter portion have one and emitter-base bandgap grading follow the capacitor that couples between the portion, and with this electric signal to this capacitor charging; And wherein a logic high signal of this electric signal and a logic low-level signal and this reference voltage relatively get.
16. system as claimed in claim 15 is characterized in that, wherein this optical receiver also comprises an optical diode, and this light signal is converted to this electric signal.
17. system as claimed in claim 15, it is characterized in that, comprise also that wherein one follows output of portion and second control switch that is connected of input of this limiting amplifier with this emitter-base bandgap grading, this control switch is used for whether basis receives this electric signal and this limiting amplifier of switch accordingly.
18. system as claimed in claim 15, it is characterized in that, wherein this common emitter portion comprises that one has a common emitter circuit of a bipolar transistor, and this bipolar transistor has the resistance that a base stage, the collection utmost point and an emitter-base bandgap grading and this base stage and be series at a negative output of this commentaries on classics impedance amplifier and is connected.
19. system as claimed in claim 15 is characterized in that, wherein this emitter-base bandgap grading portion of following comprises that an emitter-base bandgap grading with a bipolar transistor follows circuit, and this bipolar transistor has a base stage, a collection utmost point and an emitter-base bandgap grading and this base stage and this common emitter portion and couples.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100637514A CN100502260C (en) | 2004-07-07 | 2004-07-07 | Burst mode light receiver, system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100637514A CN100502260C (en) | 2004-07-07 | 2004-07-07 | Burst mode light receiver, system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1719755A CN1719755A (en) | 2006-01-11 |
| CN100502260C true CN100502260C (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100637514A Expired - Fee Related CN100502260C (en) | 2004-07-07 | 2004-07-07 | Burst mode light receiver, system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102891721B (en) * | 2012-10-13 | 2015-06-17 | 电子科技大学 | Optical burst receiving method and device in OBS (optical burst switching) network |
| CN113364446B (en) * | 2021-08-06 | 2021-12-17 | 深圳市迅特通信技术股份有限公司 | Burst coupling circuit |
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| CN1719755A (en) | 2006-01-11 |
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