CN101046594A - Time domain gating fiber amplifier - Google Patents
Time domain gating fiber amplifier Download PDFInfo
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- CN101046594A CN101046594A CN 200710048255 CN200710048255A CN101046594A CN 101046594 A CN101046594 A CN 101046594A CN 200710048255 CN200710048255 CN 200710048255 CN 200710048255 A CN200710048255 A CN 200710048255A CN 101046594 A CN101046594 A CN 101046594A
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Abstract
The present invention provides one kind of time domain gating fiber amplifier capable of suppressing continuous amplification on the spontaneous radiation noise during amplifying light pulse signal. The time domain gating fiber amplifier contains one three-port coupler, one amplifier module, one fiber isolator and one switch module. The three-port coupler feeds partial light signal to the photoelectric converter in the switch module for conversion into electric pulse signal to turn on the fiber switch in the switch module; the fiber switch normally in off state is triggered to on for the time duration of 1-4 times that of the light pulse signal before cut off; and the length of the fiber and the time delay of the variable fiber delay line in the switch module are so regulated that the signal light can pass through the fiber light switch in on state. The present invention can suppress spontaneous radiation noise and raise S/N ratio effectively, and has simple structure and good use effect.
Description
Technical field
The invention belongs to the electromagnetic wave that utilizes beyond the radiowave, only handle therein or amplify, and do not change the field of light signal form, be specifically related to a kind of time domain gating fiber amplifier.
Background technology
At present, known fiber amplifier mainly is made of amplification module.The pumping laser that laser diode sends is coupled into doped fiber continuous pumping doped dielectric in the amplification module by wavelength division multiplexer, makes the light signal that is coupled into doped fiber by wavelength division multiplexer obtain amplifying.But owing to adopt the mode of continuous pumping, doped dielectric produces a large amount of amplified spontaneous emission noises continuously, greatly reduces the signal to noise ratio (S/N ratio) of light signal.
Summary of the invention
In order to overcome the low deficiency of existing fiber amplifier signal to noise ratio (S/N ratio), the invention provides a kind of time domain gating fiber amplifier.Time domain gating fiber amplifier of the present invention can not only amplifying optical signals, can also effectively suppress the continuous amplified spontaneous emission noise in the amplification process, improves the particularly signal to noise ratio (S/N ratio) of pulsed optical signals of light signal.
Time domain gating fiber amplifier of the present invention contains three port coupler, amplification module, fibre optic isolater and switch module; Switch module comprises variable fibre delay line, fiber-optical switch and photoelectric commutator; First port of three port coupler is the input signal port, and second port and the 3rd port are the output signal port.Its annexation is, second port of three port coupler and being connected of amplification module, and amplification module, variable fibre delay line, fiber-optical switch, fibre optic isolater connect successively; The 3rd port of three port coupler is connected with the light input end of photoelectric commutator, and the electricity of photoelectric commutator triggers output terminal and is electrically connected with the electricity triggering input end of fiber-optical switch.
The principle of work of time domain gating fiber amplifier of the present invention is: the first port input signal light of three port coupler, a large amount of flashlights are outputed to second port, and part signal light is outputed to the 3rd port.Input optical fibre photoswitch after the variable fibre delay line of signal amplification input that amplification module is exported three port coupler, second port postpones the suitable time.The triggering fiber-optical switch made it to open after three port coupler the 3rd port changed into the trigger pulse electric signal with part signal light input photoelectric commutator; Fiber-optical switch is in the light off state when Triggerless, turn-off immediately after the 1-4 times of time of lasting about optical signal pulses width after being triggered by photoelectric commutator; By adjusting the fiber lengths that connects between variable fibre delay line and fiber-optical switch, and the time delay of the variable fibre delay line of minute adjustment, make flashlight be in open mode and pass through fiber-optical switch in the time, at last through fibre optic isolater output at fiber-optical switch.Time domain gating fiber amplifier of the present invention has effectively suppressed the continuous amplified spontaneous emission noise in the amplification process owing to be provided with switch module, has improved the particularly signal to noise ratio (S/N ratio) of pulsed optical signals of light signal.
Switch module also can be made up of fiber-optical switch, photoelectric commutator and clock-pulse generator in the time domain gating fiber amplifier of the present invention.
Amplification module in the time domain gating fiber amplifier of the present invention is the semi-conductor amplifier amplification module of the amplification module of pumping doped fiber or optical fiber coupling, can for the broadband or the arrowband.The fiber-optical switch of amplifier can be the switch of electrooptical switching, acoustooptic switch, magneto-optic shutter or other switching effect.
Time domain gating fiber amplifier of the present invention can effectively suppress continuous amplified spontaneous emission noise when amplifying light pulse signal, improved the signal to noise ratio (S/N ratio) of signal.Simple in structure, result of use is good.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the structured flowchart of the embodiment 1 of time domain gating fiber amplifier of the present invention
Fig. 2 is the structured flowchart of the embodiment 2 of time domain gating fiber amplifier of the present invention
Among the figure, 1. three port coupler, 2. amplification modules, 3. variable fibre delay line 4. fiber-optical switches 5. photoelectric commutators 6. fibre optic isolaters 7. clock-pulse generators.
Embodiment
Among Fig. 1, time domain gating fiber amplifier of the present invention contains three port coupler 1, amplification module 2, fibre optic isolater 6 and switch module; Switch module comprises variable fibre delay line 3, fiber-optical switch 4 and photoelectric commutator 5; First port of three port coupler 1 is the input signal port, and second port and the 3rd port are the output signal port.Its annexation is, second port of three port coupler 1 is connected with amplification module 2, and amplification module 2, variable fibre delay line 3, fiber-optical switch 4, fibre optic isolater 6 connect successively; The 3rd port of three port coupler 1 is connected with the light input end of photoelectric commutator 5, and the electricity of photoelectric commutator 5 triggers output terminal and is electrically connected with the electricity triggering input end of fiber-optical switch 4.
The course of work of present embodiment is: the first port input signal light of three port coupler 1, a large amount of flashlights are outputed to second port, and part signal light is outputed to the 3rd port; Input optical fibre photoswitch 4 after the variable fibre delay line 3 of signal amplification input that amplification module 2 is exported three port coupler, 1 second port postpones the suitable time; Triggering fiber-optical switch 4 made it to open after three port coupler 1 the 3rd port changed into the trigger pulse electric signal with part signal light input photoelectric commutator 5; Fiber-optical switch 4 is in the light off state when Triggerless, turn-off immediately after the 1-4 times of time of lasting about optical signal pulses width after being triggered by photoelectric commutator 5; By adjusting the fiber lengths of 4 of variable fibre delay line 3 of connection and fiber-optical switches, and the time delay of the variable fibre delay line 3 of minute adjustment make flashlight fiber-optical switch 4 be in open mode in the time by fiber-optical switch 4, at last through fibre optic isolater 6 outputs.
Among Fig. 2, time domain gating fiber amplifier of the present invention contains three port coupler 1, amplification module 2, fibre optic isolater 6 and switch module; Switch module comprises fiber-optical switch 4, photoelectric commutator 5 and clock-pulse generator 7; First port of three port coupler 1 is the input signal port, and second port and the 3rd port are the output signal port.Its annexation is, second port of three port coupler 1 is connected with amplification module 2, and amplification module 2, fiber-optical switch 4, fibre optic isolater 6 connect successively; The 3rd port of three port coupler 1 is connected with the input of the light of photoelectric commutator 5 is short, the electricity of photoelectric commutator 5 triggers output terminal and is electrically connected with the electricity triggering input end of clock-pulse generator 7, and the output terminal of clock-pulse generator 7 triggers input end with the electricity of fiber-optical switch 4 and is electrically connected.
The course of work of present embodiment is: the first port input signal light of three port coupler 1, a large amount of flashlights are outputed to second port, and part signal light is outputed to the 3rd port; Amplification module 2 amplifies input optical fibre photoswitch 4 with the signal of three port coupler, 1 second port output; Three port coupler 1 the 3rd port changes into triggering synchronous pulse producer 7 behind the trigger pulse electric signal with part signal light input photoelectric commutator 5, and clock-pulse generator 7 back that is triggered produces the electric pulse trigger pip that postpones and triggers fiber-optical switch 4 and makes it to open; Fiber-optical switch 4 is in the light off state when Triggerless, turn-off immediately after the 1-4 times of time of lasting about optical signal pulses width after being triggered by clock-pulse generator 7; By adjusting the fiber lengths of 4 of connection amplification module 2 and fiber-optical switches, and the trigger pip of minute adjustment clock-pulse generator 7 make time delay flashlight fiber-optical switch 4 be in open mode in the time by fiber-optical switch 4, at last through fibre optic isolater 6 outputs.
Claims (6)
1. time domain gating fiber amplifier, it is characterized in that: described amplifier contains three port coupler (1), amplification module (2), fibre optic isolater (6) and switch module; Switch module comprises variable fibre delay line (3), fiber-optical switch (4) and photoelectric commutator (5); First port of three port coupler (1) is the input signal port, and second port and the 3rd port are the output signal port; Its annexation is, second port of three port coupler (1) is connected with amplification module (2), and amplification module (2), variable fibre delay line (3), fiber-optical switch (4), fibre optic isolater (6) connect successively; The 3rd port of three port coupler (1) is connected with the light input end of photoelectric commutator (5), and the electricity of photoelectric commutator (5) triggers output terminal and is electrically connected with the electricity triggering input end of fiber-optical switch (4).
2. time domain gating fiber amplifier according to claim 1 is characterized in that: described switch module comprises fiber-optical switch (4), photoelectric commutator (5) and clock-pulse generator (7); Its annexation is, second port of three port coupler (1) is connected with amplification module (2), and amplification module (2), fiber-optical switch (4), fibre optic isolater (6) connect successively; The 3rd port of three port coupler (1) is connected with the light input end of photoelectric commutator (5), the electricity of photoelectric commutator (5) triggers output terminal and is electrically connected with the electricity triggering input end of clock-pulse generator (7), and the output terminal of clock-pulse generator (7) triggers input end with the electricity of fiber-optical switch (4) and is electrically connected.
3. time domain gating fiber amplifier according to claim 1 and 2 is characterized in that: described amplification module is the amplification module of pumping doped fiber.
4. time domain gating fiber amplifier according to claim 1 and 2 is characterized in that: described amplification module is the semi-conductor amplifier amplification module of optical fiber coupling.
5. time domain gating fiber amplifier according to claim 1 and 2 is characterized in that: described amplification module be the broadband or the arrowband.
6. time domain gating fiber amplifier according to claim 1 is characterized in that: described fiber-optical switch is a kind of in electrooptical switching, acoustooptic switch or the magneto-optic shutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100482555A CN100492150C (en) | 2007-01-11 | 2007-01-11 | Time domain gating fiber amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100482555A CN100492150C (en) | 2007-01-11 | 2007-01-11 | Time domain gating fiber amplifier |
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| Publication Number | Publication Date |
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| CN101046594A true CN101046594A (en) | 2007-10-03 |
| CN100492150C CN100492150C (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100482555A Expired - Fee Related CN100492150C (en) | 2007-01-11 | 2007-01-11 | Time domain gating fiber amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296051B (en) * | 2008-06-12 | 2011-05-18 | 上海交通大学 | Multilevel light time-division multiplexer with three as base number |
| CN104049389A (en) * | 2014-05-16 | 2014-09-17 | 中国科学院上海光学精密机械研究所 | Modulation device for phase of all-fiber laser pulse |
-
2007
- 2007-01-11 CN CNB2007100482555A patent/CN100492150C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296051B (en) * | 2008-06-12 | 2011-05-18 | 上海交通大学 | Multilevel light time-division multiplexer with three as base number |
| CN104049389A (en) * | 2014-05-16 | 2014-09-17 | 中国科学院上海光学精密机械研究所 | Modulation device for phase of all-fiber laser pulse |
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| Publication number | Publication date |
|---|---|
| CN100492150C (en) | 2009-05-27 |
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Granted publication date: 20090527 Termination date: 20120111 |