CN102176105B - Direct-phase-modulation-based femtosecond wideband pulse generation optical ring - Google Patents
Direct-phase-modulation-based femtosecond wideband pulse generation optical ring Download PDFInfo
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- CN102176105B CN102176105B CN201110058248A CN201110058248A CN102176105B CN 102176105 B CN102176105 B CN 102176105B CN 201110058248 A CN201110058248 A CN 201110058248A CN 201110058248 A CN201110058248 A CN 201110058248A CN 102176105 B CN102176105 B CN 102176105B
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Abstract
The invention discloses a direct-phase-modulation-based femtosecond wideband pulse generation optical ring in the technical field of wireless communication. The direct-phase-modulation-based femtosecond wideband pulse generation optical ring comprises a first light path switch, an amplifier, a wavelength division multiplexer, a narrowband fiber filter, a second light path switch and two phase modulators which are sequentially connected in series to form a loop, wherein the input end of the first light path receives a square signal; and the output end of the second light path switch outputs chirped pulses. The direct-phase-modulation-based femtosecond wideband pulse generation optical ring can endow generated wideband pulses with linear phases, suppress the production of nonlinear effects in the pulses and filter the light, with the central wavelength of 1,030nm, of the ytterbium-doped fiber amplifier to realize the high signal to noise ratio of a system, and better realizes secondary pulse phase modulation by controlling the external voltage of the phase modulators.
Description
Technical field
What the present invention relates to is a kind of method of wireless communication technology field, specifically is that a kind of femtosecond wideband pulse based on the Direct Phase modulation produces fiber optic loop.
Background technology
At present, laser broadband method for generating pulse commonly used generally has two kinds.First kind is exactly to produce ultrashort pulse through mode-locked laser, utilizes chirped pulse broadening technology then, obtains the laser pulse in broadband.Second kind then is to utilize phase-modulator to realize the phase modulation (PM) to narrow-band impulse, obtains the laser pulse in broadband through the frequency modulation effect.These the two kinds modes that produce the laser broadband pulse can produce discrete spectrum in utilization; But also need through using the high frequency acousto-optic modulator could obtain bigger bandwidth.Usually can produce nonlinear effect in the experiment, influence the stability of total system.
Retrieval through to prior art is found; The paper of one piece " Generation of 3.5 nJ femtosecond pulses from a coutinuous-wave laser without mode locking " by name (continuous laser does not have locked mode and generates the 3.5nJ femtosecond pulse) is arranged on the optics letter (English edition) of 11 phases of volume, 1 day the 32nd June in 2007, and a kind of method that produces femtosecond pulse through the Direct Phase modulation system has been introduced in its inside.
But the use centre wavelength of this prior art is 1550nm, and the amplifier that uses in its fiber optic loop is an EDFA Erbium-Doped Fiber Amplifier, is not suitable for the system that centre wavelength is 1054nm.And only used a phase-modulator, modulation effect to be difficult to the fine requirement of experiment that satisfies in its system.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists, provide a kind of femtosecond wideband pulse to produce fiber optic loop, not only can make the broadband laser pulse of generation have linear phase based on the Direct Phase modulation, and generation that can suppressor pulse neutral line effect.The centre wavelength of new system is 1054nm; The amplifier that uses is ytterbium doped optical fiber amplifier; And the increase of innovation the wavelength division multiplexer of a 1030/1054nm, realize filtration to ytterbium doped optical fiber amplifier centre wavelength 1030nm light, realized the high s/n ratio of system.And having used instead of also innovating of system a pair of phase-modulators of two unlike signal controls, through the impressed voltage of control phase modulator, better realize the secondary property of sampling phase.
The present invention realizes through following technical scheme; The present invention includes: first light path switch, amplifier, wavelength division multiplexer, narrow band fiber wave filter, second light path switch and two phase-modulators of being followed in series to form loop; Wherein: the input end of first light path switch receives square-wave signal, the output terminal output chirped pulse of second light path switch.
The suitable wave band of described light path switch is 1054nm, inserts loss＜3db, switching speed＜100ps, half-wave voltage 5v.
Described amplifier is a ytterbium doped optical fiber amplifier, its enlargement factor >=20dB, and centre wavelength is 1054nm.
The binary channels wavelength of described wavelength division multiplexer is respectively 1030nm and 1054nm, inserts loss≤0.4dB, isolation>=13dB.
The centre wavelength of described narrow band fiber wave filter is 1054nm, and peak reflectivity is greater than 99%, and three dB bandwidth is 12nm, and the sideband inhibiting rate is greater than 10dB.
The suitable wave band of described phase-modulator is 1054nm, three dB bandwidth＞10GHz, and half-wave voltage 5V, input and output are protected partially.
Utilize the electric light wave chopping technology, produce square-wave pulse, through the device of fiber optic loop, realize periodic modulation again the laser chirped pulse.In fiber optic loop, add two frequency modulators, through controlling the positive and negative of its impressed voltage, realize the positive and negative compensation of paired pulses phase differential, and then realize the zero phase difference modulation of chirped pulse.Let pulse repeatedly cycle through fiber optic loop at last again, realize repeatedly accurately modulation the broadened bandwidth of chirped pulse and impulse phase.Realized that spectrum is adjustable, warbled arbitrarily that pulsewidth is controlled, the global function pulse of random time shaping generates.
The invention has the beneficial effects as follows, can avoid testing the generation of non-linear hour effectiveness, and realized the controlled zero distortion with phase place of chirped pulse pulsewidth.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is that embodiment connects synoptic diagram.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1; Present embodiment comprises: first light path switch, amplifier, wavelength division multiplexer, narrow band fiber wave filter, second light path switch and two phase-modulators of being followed in series to form loop; Wherein: the input end of first light path switch receives square-wave signal, the output terminal output chirped pulse of second light path switch.
As shown in Figure 2; Single longitudinal mode laser, first Mach are increased moral switch, first ytterbium doped optical fiber amplifier, second Mach to be increased moral switch, second ytterbium doped optical fiber amplifier and narrow band filter and is connected the back successively and is connected with the input end of first light path switch of this device and exports square wave; Wherein: the single longitudinal mode laser output bandwidth is that 0.1nm, power are the continuous impulse of 100mw; When pulse is input to first Mach when increasing the moral switch, first Mach increased under the driving voltage that the moral switch is 0.5GHz in frequency the top continuous impulse cycle of cutting into is the cycle square wave of 2ns.The cycle square wave is amplified into second Mach through first ytterbium doped optical fiber amplifier again and increases the moral switch.Second Mach increases the moral switch then under the menu driven, and the signal of input is carried out menu.The single pulse signal of selecting is through the amplification of second ytterbium doped optical fiber amplifier compensation, and laggard " 2 * 2 photoswitch " of going in the fiber optic loop of the filtering of wave filter.The output signal is input to second " 2 * 2 photoswitch " through the amplification compensation of the amplifier in this device after the filtering of wavelength division multiplexer and narrow band filter, the signal of switch output after this will get into two phase-modulators.Wherein the two phase place modulator can be got back to first " 2 * 2 photoswitch " with the signal conveys that modulates at last again according to the positive and negative and big or small out of phase difference modulation that realizes pulse signals of adding driving voltage.Behind the N that circulates the successively circle, export needed broadband chirped pulse signal from a vacant output port of second " 2 * 2 photoswitch ".
Claims (1)
1. the femtosecond wideband pulse based on the Direct Phase modulation produces fiber optic loop; It is characterized in that; Comprise: first light path switch, amplifier, wavelength division multiplexer, narrow band fiber wave filter, second light path switch and two phase-modulators of being followed in series to form loop; Wherein: the input end of first light path switch receives square-wave signal, the output terminal output chirped pulse of second light path switch;
The suitable wave band of described light path switch is 1054nm, inserts loss < 3db, switching speed < 100ps, half-wave voltage 5v;
Described amplifier is a ytterbium doped optical fiber amplifier, its enlargement factor >=20dB, and centre wavelength is 1054nm;
The binary channels wavelength of described wavelength division multiplexer is respectively 1030nm and 1054nm, inserts loss≤0.4dB, isolation>=13dB;
The centre wavelength of described narrow band fiber wave filter is 1054nm, and peak reflectivity is greater than 99%, and three dB bandwidth is 12nm, and the sideband inhibiting rate is greater than 10dB;
The suitable wave band of described phase-modulator is 1054nm, three dB bandwidth>10GHz, half-wave voltage 5V, input and output are protected partially.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110058248A CN102176105B (en) | 2011-03-10 | 2011-03-10 | Direct-phase-modulation-based femtosecond wideband pulse generation optical ring |
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| CN201110058248A CN102176105B (en) | 2011-03-10 | 2011-03-10 | Direct-phase-modulation-based femtosecond wideband pulse generation optical ring |
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| CN102176105A CN102176105A (en) | 2011-09-07 |
| CN102176105B true CN102176105B (en) | 2012-09-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049389B (en) * | 2014-05-16 | 2017-03-15 | 中国科学院上海光学精密机械研究所 | Full optical fiber laser displacement modulation device |
| CN109818237B (en) * | 2019-03-28 | 2021-01-01 | 上海交通大学 | Ultrashort laser pulse shaping system based on optical fiber ring circulation modulation time grating |
| CN113078543B (en) * | 2021-03-30 | 2022-05-17 | 南京帕卓丽电子科技有限公司 | Cascade light modulator capable of generating large chirp |
| CN113328331B (en) * | 2021-05-14 | 2022-03-25 | 杭州电子科技大学 | Sagnac ring ultra-short pulse laser generator based on high saturation absorption |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414728A (en) * | 2001-10-26 | 2003-04-30 | 中国科学院研究生院 | Full optical fibre shift light pulse sequence compression-expansion mode |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414728A (en) * | 2001-10-26 | 2003-04-30 | 中国科学院研究生院 | Full optical fibre shift light pulse sequence compression-expansion mode |
Non-Patent Citations (1)
| Title |
|---|
| James van Howe,Jennifer H. Lee,and Chris Xu.《Generation of 3.5nJ femtosecond pulses from a continuous-wave laser without mode locking》.《Optics Letters》.2007,第32卷(第11期),1408-1410. * |
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