CN1142639C - Light emitting circuit with compatibility of conventional mode with burst mode - Google Patents
Light emitting circuit with compatibility of conventional mode with burst mode Download PDFInfo
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- CN1142639C CN1142639C CNB991011902A CN99101190A CN1142639C CN 1142639 C CN1142639 C CN 1142639C CN B991011902 A CNB991011902 A CN B991011902A CN 99101190 A CN99101190 A CN 99101190A CN 1142639 C CN1142639 C CN 1142639C
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Abstract
The present invention discloses a light emitting circuit which comprises a laser assembly, a light offset circuit, a light modulation circuit, a double-end differential PECL switch off /on control signal generating device, a switch off-on circuit, etc., wherein an output end of the double-end differential PECL switch off /on control signal generating device is connected with the light offset circuit; the double-end differential PECL switch off /on control signal generating device at an input end of the switch off-on circuit is connected with inputted data streams; an output end of the switch off-on circuit is connected with the light modulation circuit to offer control signals to the light modulation circuit. The laser assembly of the light emitting circuit can be rapidly switched on or off, and the compatibility of conventional and burst modes is realized; the present invention can be used for devices, such as passive light networks, etc.
Description
The present invention relates to a kind of light emission module circuit that is used for passive optical network (PON).
In passive optical network, the data receiver formula has two kinds of forms usually, and the one, normal mode, as shown in Figure 1a, it is continuous sending data; Another kind is a burst mode, and x time happens suddenly, shown in Fig. 1 b.Existing technology is normally finished with different circuit with burst mode conventional, the light emission module of normal mode is mainly used in the down direction emission system of TDMA (time division multiple access) mode system, and the burst mode light emission module is mainly used in the up light emission system of ONU (optical network unit).
In burst mode, each ONU adopts the time-sharing multiplex mode, launches in the moment of regulation, for fear of facing ONU mutually data collision takes place, so protection tg transit time (guard time) is arranged between the ONU, sees Fig. 1 b.Simultaneously; guard time tg should shorten as far as possible; to improve system's transmission efficiency; make system's available resources increase; cost reduces; this is crucial on to the very responsive access net system of price, in order to reduce guard time, must make the light of the light emission module of burst mode open the turn-off speed raising.Secondly, in the turn-off time, the Yu Guanghui of each ONU is superimposed upon on the ONU that is launching, and causes signal to noise ratio to reduce, and produces error code, so blocking interval, send out light surplus should be low as far as possible.The 3rd, because path and the loss of each ONU arrival OLT (optical line terminal) are also inequality, cause the OLT receiving sensitivity to descend.Mainly finish the burst emission function of TDMA mode at present in the following ways: the LD light emission module that 1, adopts normal mode; 2, adopt the LD photoelectric subassembly to add control circuit, finish the unlatching and the shutoff of bursty data,, but do not have automatic control function of power usually by system's control laser output power; As " optical-fiber network that is used for local loop " that be published in the 23rd page of " JOURNAL OF LIGHTWAVE TECHNOLOGYVO17.NO11 " in November, 1989 o. 11th just mentioned a kind of this kind scheme, it is to use for its light emitting devices: the empty resonant cavity of FP, the device of ridge or buried heterostructure, without thermoelectric cooling, need not backlightly detect, luminous power is controlled far-end by OLT; 3, adopt LED to finish.There is following defective at least in these prior aries:
1) just use the laser transmitter module of normal mode, the switching time delays is longer, usually in the microsecond magnitude, therefore can't use in the high speed PON system, and transmission rate can only reach below the 50Mb/s usually.Take simultaneously to extend in the frame structure measure of guard time (guard time) has increased line speed, reduces transmission efficiency, has increased system cost.
2) during laser shutdown, radiating circuit produces surplus optical superposition on signal level, causes noise to increase, and power system capacity reduces.When using low light intensity luminescent device such as LED, luminous power is lower, and it is less to make that system covers geographic range.
3) adopt LD assembly and split circuit, can't accomplish normal mode and burst mode compatibility.Because the difference of system construction causes system bulk to increase.Make system produce the attended operation complexity, reliability reduces.
Purpose of the present invention is exactly in order to overcome the above problems, and a kind of quick switching function that has is provided, and noise is little, the light emission module circuit of routine and burst mode compatibility.This circuit makes the PON system of TDMA constitute simplification, and performance improves, and cost reduces.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of optical transmission circuit, input traffic DAIA is converted into light signal to be sent, it comprises: laser assembly, optical biasing circuit, optical modulating circuit, described optical biasing circuit output end links to each other with laser assembly, for laser assembly provides bias current; The output of described optical modulating circuit links to each other with laser assembly, for laser assembly provides modulated current; It is characterized in that this circuit also comprises with the lower part:
Both-end difference PECL shutoff/unlatching control signal OFF ,/the OFF generation device, its output links to each other with described optical biasing circuit;
One is turn-offed open circuit, terminals of its input and described both-end difference PECL shutoff/unlatching control signal OFF ,/wherein one road output of OFF generation device links to each other, and also has other terminals to link to each other with data flow DATA simultaneously; Its output links to each other with optical modulating circuit, for optical modulating circuit provides control signal.
Because the present invention has increased shutoff and open control circuit, make and to control modulated current and bias current is opened simultaneously and turn-offed, present technical merit can realize that shutoff and opening time are all less than 6.5ns, the laser luminous power is had no progeny less than-60dBm in the pass, the noise that caused on signal level of the surplus optical superposition that produces of radiating circuit is just very little like this, the switching time delays is improved to nanosecond order by microsecond magnitude of the prior art, therefore can use high speed PON system, in the APON system, improve transmission rate.The guard time (guard time) that can extend in frame structure has simultaneously increased transmission efficiency, has reduced system cost.Often open as opening control signal, then with conventional module compatibility.
Fig. 1 a is the light emission signal schematic diagram of normal mode.
Fig. 1 b is the light emission signal schematic diagram of burst mode.
Fig. 2 is the theory diagram of the embodiment of the invention.
Fig. 3 is signal conversion circuit 107 schematic diagrames of the embodiment of the invention.
Fig. 4 is shutoff open circuit 106 schematic diagrames of the embodiment of the invention.
Fig. 5 is the optical modulating circuit 105 and laser assembly 103 schematic diagrames of the embodiment of the invention.
Fig. 6 is the optical biasing circuit 104 and waveform shaping circuit 102 schematic diagrames of the embodiment of the invention.
Fig. 7 is the detection backlight and automatic power control circuitry 101 schematic diagrames of the embodiment of the invention.
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
The The general frame of present embodiment as shown in Figure 2, this optical transmission circuit comprises: laser assembly 103, optical biasing circuit 104, optical modulating circuit 105.Described optical biasing circuit 104 outputs link to each other with laser assembly 103, for laser assembly 103 provides bias current.The output of described optical modulating circuit 105 links to each other with laser assembly 103, for laser assembly 103 provides modulated current.
Different is that this circuit also comprises with prior art: 1) both-end difference PECL shutoff/unlatching control signal OFF ,/OFF generation device 108, its output links to each other with described optical biasing circuit 104; 2) one is turn-offed open circuit 106, terminals of its input and described both-end difference PECL shutoff/unlatching control signal OFF ,/wherein one road output of OFF generation device 108 links to each other, and also has other terminals to link to each other with data flow DATA simultaneously; Its output links to each other with optical modulating circuit 105, for optical modulating circuit 105 provides control signal.
Described both-end difference PECL shutoff/unlatching control signal OFF ,/the OFF generation device comprises that the TTL of a single-ended input turn-off to open control signal DISABLE and signal conversion circuit 107.As Fig. 3, finish the shutoff/unlatching control signal/OFF that shutoff/unlatching control signal DISABLE of the TTL of single-ended input is converted to the difference PECL of both-end output, the function of OFF.
As Fig. 4, described shutoff open circuit 106 is made up of with door PECL.The input be respectively single-ended modulation signal DATA and single-ended cut-off signals/OFF, be output as difference /DOFF and DOFF.Finish function and be used for back level optical modulating circuit 105 needed modulation signals for producing.
As Fig. 5, described optical modulating circuit 105 comprises first to the 9th resistance R 1-R9, first to the 3rd triode T1-T3, the first amplifier U1A; Wherein the first and the 3rd triode T1, T3 are the speed-sensitive switch triode, work in the speed-sensitive switch state, its emitter all links to each other with the collector electrode of the second triode T2, its base stage two output signal DOFF by the 4th resistance R 4 and the 12 resistance R 12 and shutoff open circuit 106 respectively links to each other with/DOFF, and the base stage of the first triode T1 is also by the 5th resistance R 5 ground connection or power supply negative terminal, and the base stage of the 3rd triode T3 is also by the 11 resistance R 11 ground connection or power supply negative terminal; The collector electrode of the first triode T1 connects power positive end by the 8th resistance R 8, and the collector electrode of the 3rd triode T3 links to each other with laser assembly 103 by the tenth resistance R 10, and modulated current is provided; The second triode T2 forms constant-current source circuit, and its base stage connects the output of the first amplifier U1A by the 7th resistance R 7, and emitter is by the 9th resistance R 9 ground connection or power supply negative terminal; The in-phase input end of the described first amplifier U1A meets outer increase control signal EM, and first to the three resistance R 1-R3, the 6th resistance R 6 be connected in the input circuit of the first amplifier U1A, adjusts its input voltage and input signal.The input signal of this part circuit be the differential modulation signal DOFF that sends from aforementioned shutoff open circuit 106 and/DOFF, output signal is the modulated current that is loaded on the laser, It is the bias current on the laser of being loaded into of 104 bias current circuits output.
Resistance R 1, R2 produces constant-current source bias voltage as divider resistance, links to each other with the in-phase end of amplifier U1A.The end of oppisite phase of amplifier connects with the output of amplifier by R3, constitutes voltage follower circuit.Its effect is the output of following by amplifier, improves the output impedance of constant-current source bias voltage, and anti-common-mode noise ability strengthens.Outer control end EM is used to adjust the output of VIM.The amplifier output voltage is VIM, directly links to each other with the T2 base stage, and T2, R8 constitutes constant-current source circuit, and the electric current that flows through R8 is I8.T1, T3 are switch triode, R4, and R5, R10, R11 is a divider resistance, is used to accelerate T1, and the switching time of T3, R8, R10 provide collector current, and the selected internal resistance that is used to mate laser simultaneously of R8, R10 resistance makes T1, T3 work balance.
As Fig. 6, described optical biasing circuit 104 comprises the 12 to the 19 resistance R 12-R19, the 5th to the 7th triode T5-T7; The the 5th and the 7th triode T5 wherein, T7 is the speed-sensitive switch triode, work in the speed-sensitive switch state, its emitter all links to each other with the collector electrode of the 6th triode T6, its base stage is respectively by the 12 resistance R 12, the 19 resistance R 19 and both-end difference PECL shutoff/unlatching control signal OFF, two output signal OFF of/OFF generation device 108 link to each other with/OFF, the collector electrode of the 5th triode T5 connects power positive end by the 14 resistance R 14, the collector electrode of the 7th triode T7 links to each other with laser assembly 103 by the series circuit of the 16 resistance R 16 and the 18 resistance R 18, and bias current is provided; The 6th triode T6 forms constant-current source circuit, and its base stage connects detection backlight and automatic power control circuitry 101, and emitter is by the 15 resistance R 15 ground connection or power supply negative terminal.
Prior art is except aforementioned several shortcomings, also have the various light emitting power automatic control circuits of normal mode uncontrollable to the burst mode light emitting power, and shortcoming that can not online dynamic change, make the difficulty of accepting of burst mode strengthen, receiving sensitivity and dynamic range reduce.
The present invention adopts automatic power control circuitry, when service condition changes within the specific limits or during laser ageing, Output optical power changed keep in the 1dB, and can pass through outer control end, makes the luminous power can online dynamic adjustable ± 2dB.This realizes by increase detection backlight and automatic power control circuitry 101 in circuit, this circuit 101 comprises continuous successively photoelectric cell PIN, strides resistance dc amplification circuit 201, emitter follower 202, peak-detector circuit 203, the second amplifier U2A as shown in Figure 7.Described photoelectric cell PIN receives the light dorsad that laser assembly 103 is sent, amplify and be converted to voltage output by striding resistance dc amplification circuit 201, peak-detector circuit 203 detection peak, be added to the in-phase end of the second amplifier U2A, output signal VIB after the second amplifier U2A amplifies is added in the optical biasing circuit 104; Wherein emitter follower 202 is used to improve the input impedance of back level peak-detector circuit.
Its physical circuit is still as Fig. 7, the described resistance dc amplification circuit 201 of striding comprises the 101 to 105 resistance R 101-R105, the the tenth to 12 triode T10-T12, described emitter follower 202 comprises the 13 triode T13, the 106 resistance R 106, described peak-detector circuit 203 comprises the 111 resistance R 111, second capacitor C 2, the 14 triode T14, the base stage sending and receiving emitter follower 202 of the 14 triode T14 wherein, collector electrode connects power positive end, emitter connects the in-phase input end of the second amplifier U2A, and passes through the parallel circuits ground connection or the power supply negative terminal of the 111 resistance R 111 and second capacitor C 2.Input DISABLE signal is inserted by the base stage of the 15 triode T15.This circuit 101 also comprises auxiliary resistance R107-110, and R112 is used to adjust the operating state of triode and amplifier.Owing to be to adopt peak detection, Sampling techniques, and do not adopt double integrator mode general in the prior art, make photopeak value power to adjust automatically, keep photopeak value power output balance.
Also having a shortcoming in the prior art, is exactly that concussion that waveform generation is bigger and distortion make eye opening less in switching drives.The present invention adopts effective waveform shaping technology, and that has eliminated the laser output that is easy to occur under burst mode opens delay distortion and relaxation concussion, makes the light emission eye opening of burst mode improve.The main waveform shaping circuit 102 as shown in Figure 6 of this design is realized, described waveform shaping circuit 102 comprises first capacitor C 1 and the 20 resistance R 20 that is in series, wherein first capacitor C 1 links to each other with power positive end, and the 20 resistance R 20 and the collector electrode of the 7th triode T7 also are that the output of optical biasing circuit 104 links to each other.Can improve the lag characteristic of opening of waveform overshoot, light like this, avoid the relaxation concussion of laser.
As seen from last, the present invention adopts and turn-offs and open circuit, makes modulated current and bias current all open simultaneously and turn-off, turn-off with the opening time all less than 6.5ns, close the laser luminous power of having no progeny less than-60dB.To open control signal and often open, then with conventional module compatibility.The present invention can pass through outer control end, and luminous power can online dynamic adjustable ± 2dB.The present invention adopts effective waveform shaping technology, and that has eliminated the laser output that is easy to occur under burst mode opens delay distortion and relaxation concussion, makes the light emission eye opening of burst mode improve.The present invention also adopts automatic power control circuitry, makes luminous power output keep constant.
Claims (6)
1. optical transmission circuit, input traffic DATA is converted into light signal to be sent, it comprises: laser assembly (103), optical biasing circuit (104), optical modulating circuit (105), described optical biasing circuit (104) output links to each other with laser assembly (103), for laser assembly (103) provides bias current; The output of described optical modulating circuit (105) links to each other with laser assembly (103), for laser assembly (103) provides modulated current; It is characterized in that: this circuit also comprises with the lower part:
Both-end difference PECL shutoff/unlatching control signal OFF ,/OFF generation device (108), its output links to each other with described optical biasing circuit (104);
One is turn-offed open circuit (106), terminals of its input and described both-end difference PECL shutoff/unlatching control signal OFF ,/wherein one road output of OFF generation device (108) links to each other, and also has other terminals to link to each other with data flow DATA simultaneously; Its output links to each other with optical modulating circuit (105), for optical modulating circuit (105) provides control signal.
2. optical transmission circuit as claimed in claim 1, it is characterized in that: also comprise detection backlight and automatic power control circuitry (101), this circuit comprises continuous successively photoelectric cell PIN, strides resistance dc amplification circuit (201), emitter follower (202), peak-detector circuit (203), the second amplifier U2A; Described photoelectric cell PIN receives the light dorsad that laser assembly (103) is sent, amplify and be converted to voltage output by striding resistance dc amplification circuit (201), peak-detector circuit (203) detection peak, be added to the in-phase end of the second amplifier U2A, output signal VIB after the second amplifier U2A amplifies is added in the optical biasing circuit (104); Wherein emitter follower (202) is used to improve the input impedance of back level peak-detector circuit.
3. optical transmission circuit as claimed in claim 2, it is characterized in that: described peak-detector circuit (203) comprises the 111 resistance R 111, second capacitor C the 2, the 14 triode T14, the base stage sending and receiving emitter follower (202) of the 14 triode T14 wherein, collector electrode connects power positive end, emitter connects the in-phase input end of the second amplifier U2A, and passes through the parallel circuits ground connection or the power supply negative terminal of the 111 resistance R 111 and second capacitor C 2.
4. optical transmission circuit as claimed in claim 1 is characterized in that: described shutoff open circuit (106) is made up of with door PECL; Described both-end difference PECL shutoff/unlatching control signal OFF ,/the OFF generation device comprises that the TTL of a single-ended input turn-off to open control signal DISABLE and signal conversion circuit (107), this signal conversion circuit (107) mainly is made up of to the level translator of PECL a TTL.
5. optical transmission circuit as claimed in claim 1 is characterized in that: described optical biasing circuit (104) comprises the 12 to the 19 resistance R 12-R19, the 5th to the 7th triode T5-T7; The the 5th and the 7th triode T5 wherein, T7 is the speed-sensitive switch triode, work in the speed-sensitive switch state, its emitter all links to each other with the collector electrode of the 6th triode T6, its base stage is respectively by the 12 resistance R 12, the 19 resistance R 19 and both-end difference PECL shutoff/unlatching control signal OFF, two output signal OFF of/OFF generation device (108) link to each other with/OFF, the collector electrode of the 5th triode T5 connects power positive end by the 14 resistance R 14, the collector electrode of the 7th triode T7 links to each other with laser assembly (103) by the series circuit of the 16 resistance R 16 and the 18 resistance R 18, and bias current is provided; The 6th triode T6 forms constant-current source circuit, and its base stage connects detection backlight and automatic power control circuitry (101), and emitter is by the 15 resistance R 15 ground connection or power supply negative terminal; And in circuit, set up waveform shaping circuit (102), it comprises first capacitor C 1 and the 20 resistance R 20 that is in series, wherein first capacitor C 1 links to each other with power positive end, and the 20 resistance R 20 and the collector electrode of the 7th triode T7 also are that the output of optical biasing circuit (104) links to each other.
6. optical transmission circuit as claimed in claim 1 is characterized in that: described optical modulating circuit (105) comprises first to the 9th resistance R 1-R9, first to the 3rd triode T1-T3, the first amplifier U1A; Wherein the first and the 3rd triode T1, T3 are the speed-sensitive switch triode, work in the speed-sensitive switch state, its emitter all links to each other with the collector electrode of the second triode T2, its base stage two output signal DOFF by the 4th resistance R 4 and the 12 resistance R 12 and shutoff open circuit (106) respectively links to each other with/DOFF, and the base stage of the first triode T1 is also by the 5th resistance R 5 ground connection or power supply negative terminal, and the base stage of the 3rd triode T3 is also by the 11 resistance R 11 ground connection or power supply negative terminal; The collector electrode of the first triode T1 connects power positive end by the 8th resistance R 8, and the collector electrode of the 3rd triode T3 links to each other with laser assembly (103) by the tenth resistance R 10, and modulated current is provided; The second triode T2 forms constant-current source circuit, and its base stage connects the output of the first amplifier U1A by the 7th resistance R 7, and emitter is by the 9th resistance R 9 ground connection or power supply negative terminal; The in-phase input end of the described first amplifier U1A meets outer increase control signal EM, and first to the three resistance R 1-R3, the 6th resistance R 6 be connected in the input circuit of the first amplifier U1A, adjusts its input voltage and input signal; The end of oppisite phase input of amplifier U1A connects by the output of the 3rd resistance R 3 with amplifier, constitutes voltage follower circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991011902A CN1142639C (en) | 1999-01-19 | 1999-01-19 | Light emitting circuit with compatibility of conventional mode with burst mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991011902A CN1142639C (en) | 1999-01-19 | 1999-01-19 | Light emitting circuit with compatibility of conventional mode with burst mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1261226A CN1261226A (en) | 2000-07-26 |
| CN1142639C true CN1142639C (en) | 2004-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991011902A Expired - Lifetime CN1142639C (en) | 1999-01-19 | 1999-01-19 | Light emitting circuit with compatibility of conventional mode with burst mode |
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| Country | Link |
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| CN (1) | CN1142639C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334820C (en) * | 2004-01-09 | 2007-08-29 | 亚洲光学股份有限公司 | Sudden-mode driving circuit, and its method for driving transmitter and optical communication device |
| CN102315879A (en) * | 2011-07-27 | 2012-01-11 | 浙江省广电科技股份有限公司 | Uplink channel burst mode light emission circuit used for RFoG on optical fiber |
| CN102299741B (en) * | 2011-09-21 | 2014-03-05 | 中国电子科技集团公司第四十四研究所 | Method and device for transmitting uplink burst optical signal |
| US9325421B1 (en) * | 2014-06-30 | 2016-04-26 | Source Photonics (Chengdu) Co., Ltd. | Burst-mode laser control circuit and the method thereof |
| CN110429984B (en) * | 2019-09-16 | 2022-12-27 | 广州飞瑞敖电子科技股份有限公司 | Analog optical communication system for time division duplex |
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1999
- 1999-01-19 CN CNB991011902A patent/CN1142639C/en not_active Expired - Lifetime
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| CN1261226A (en) | 2000-07-26 |
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