CN1555111A - Wavelength tunable 4 femtosecond super short optical pulse generator - Google Patents
Wavelength tunable 4 femtosecond super short optical pulse generator Download PDFInfo
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- CN1555111A CN1555111A CNA2003101129187A CN200310112918A CN1555111A CN 1555111 A CN1555111 A CN 1555111A CN A2003101129187 A CNA2003101129187 A CN A2003101129187A CN 200310112918 A CN200310112918 A CN 200310112918A CN 1555111 A CN1555111 A CN 1555111A
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Abstract
An ultra-short laser pulse generator can generate a ultra-short light pulse of multiple wavelength 4 femtoseconds pulse-width in a compact structure and narrow pulsewidth, which carries out the adaptive pulsewidth compression by fibers and chirped mirrors and carries out dispersion compensation by a spatial light modulator. This generator can be the light source or light soliton source of high-speed light communications since it can emit narrow light pulse of multiple wavelengths.
Description
Technical field
The present invention is the light emitting devices in the optical fiber communication, and the light source of light carrier just is provided for high speed optical fiber communication, belongs to the optical device technical field in the optical fiber communication.
Background technology
Since pulse laser came out, the width of laser pulse became more and more narrow, by several nanosecond (1ns=10 of the mid-1960s
-9S) progressively carry out the transition to several femtosecond (1fs=10
-15Irreplaceable effect is just taking place in the research of ultrafast physics and chemical process, the fields such as application of ultrahigh speed communication aspects in s), so short pulse duration.Since the sixties in 20th century, first generation laser was born, because it has advantages such as monochromaticjty is good, the coherence is good, high brightness, thereby make laser technology obtain development at full speed, wherein Fa Zhan a important directions is that output pulse width is more and more narrow, and this field can be divided into four developing stage: middle 1960s 10
-9～10
-10Be the phase I second, it is characterized in that the foundation of locked mode theory and the exploration of various locked mode methods, and this belongs to the starting stage of ultrashort laser pulse; The middle and later periods seventies 20th century 10
-11～10
-12Be second stage second, it is characterized in that various locked mode modes and theory are progressively ripe, and beginning Preliminary Applications in some fields; Be the phase III eighties in 20th century, and its principal character is that pulsewidth has entered the femtosecond stage, and its basic theories still is a passive mode locking, but because the collision effect of pulse makes this laser stably operate at the femtosecond magnitude; Begun the quadravalence section of ultrashort laser pulse the nineties in 20th century, this stage is aspect laser medium new breakthrough have been arranged, and particularly the self mode locking titanium-doped sapphire laser can produce the pulse of 60fs.
The most representative in the ultrashort laser technology is the femtosecond laser technology, and femto-second laser can be divided into four classes according to the difference of laser medium, and the first kind is an organic dye laser, and its most effective wave band concentrates near the ruddiness (620nm); Second class is to be that the solid material of representative is the solid state laser of medium with the titanium-doped sapphire, and its wave-length coverage is at near-infrared: 700nm～1.10 μ m and 1.2 μ m～1.3 μ m; The 3rd class is that mqw material is the semiconductor laser of medium, it has features such as high-gain, low chromatic dispersion, broad band, and wave-length coverage is near 1.3 μ m and 1.5 μ m, and the wavelength of emission meets the requirement of communication band, be suitable as communication light source, but pulse duration is at subpicosecond (1ps=10
-12S) magnitude; The 4th class is that silicon (Si) optical fiber with doped with rare-earth elements is the fiber laser of medium, and its emission wavelength also is fit to the optical communication requirement, and compact conformation, small and exquisite, but because optical fiber itself is not fine aspect stable.
In the technology that produces ultrashort light pulse, a kind of important techniques is exactly a pulse compression technique, and its basic thought is based on the application of fiber nonlinear effect, produces nonlinear effect and effect of dispersion by inside of optical fibre, has obtained the pulse of 5fs.The thought of optical compression is to come from the radiation of warbling, and promptly in GVD (Group Velocity Dispersion) (GVD) when existing, the different components of pulse move with different speed, if the forward position of pulse just in time postpones an amount, make its almost with the back along arriving simultaneously, then Shu Chu pulse is compressed.For the pulse front edge speed that makes red shift reduces, the GVD that positive chirped pulse need be born; On the contrary, negative chirped pulse is then needed positive GVD, to reduce the blue shift speed of pulse.Basic thought of the present invention is based on the pulse compression theory, at first be light pulse is produced strong positive GVD through positive dispersion fiber, and then reflection produces negative warbling through chirped mirror multimedium layer, also utilizes spatial light modulator to carry out dispersion compensation simultaneously.This wherein is to utilize chirped mirror and spatial light modulator acting in conjunction to carry out pulse compression and dispersion compensation.And general compress technique just utilizes two sections opposite optical fiber of chromatic dispersion to carry out pulse compression, this needs the length of two sections optical fiber very accurate, and need stable LASER Light Source, because optical fiber itself is stable inadequately by the optical pulse compressor that two sections opposite optical fiber of chromatic dispersion are formed.The present invention uses chirped mirror and spatial light modulator work, can produce stable light pulse compression.
Summary of the invention
The purpose of this invention is to provide a kind of ultrashort laser pulse generator, the light source of light carrier just is provided for high speed optical fiber communication, this device provides a kind of good ballistic device for speed fiber optic communication systems, the various defectives that prior art exists have been solved preferably, can launch the multi-wavelength ultrashort light pulse, be well suited for the optical communication requirement.
The object of the present invention is achieved like this: this device includes following parts (as shown in Figure 1):
(1) 1 is mode locking semiconductor laser (LD), and it can launch the multiwavelength laser bundle that meets optical communication requirement wave band;
(2) 2,4 is polarization beam apparatus (PBS), the feedback of control beam, input and output;
(3) 3 is semiconductor amplifier, amplifies light pulse power;
(4) 6 for converging mirror;
(5) 5 is chirped mirror, and light pulse is compressed;
(6) 7,8,9,14,15 is the plated film plane mirror, changes light path;
(7) 12,13 is concave mirror, changes light path;
(8) 10,11 is grating;
(9) 16 is spatial light modulator (SLM), compensation of dispersion.
Description of drawings
Fig. 1 is the method and apparatus schematic diagram.
Fig. 2 is the schematic diagram of polarization beam apparatus (PBS).
Embodiment
As shown in Figure 1, the present invention is the most basic transmitting illuminant with mode locking semiconductor laser 1, can launch the laser pulse of optical communicating waveband such as 1550nm, and pulsewidth should reach subpicosecond level (1ps=10
-12S); The light pulse of coming out from 1 is coupled in the polarization beam apparatus 2, polarization beam apparatus 2 as shown in Figure 2,17 is first polarizer, and 18 is Faraday polarization apparatus, and 19 is second polarizer, light through first polarizer 17 after, become polarised light, this polarised light is through behind the Faraday polarization apparatus 18, and the polarization direction rotates 45 °, parallel with second polarizer 19 direction, so this Shu Guang has just passed through polarization beam apparatus.As shown in Figure 1, the light pulse of coming out from 2 enters into amplifier 3 through the connection of monomode fiber, amplifier 3 is semiconductor amplifiers, power amplification is carried out in 3 light pulses, light pulse bundle after the amplification is coupled in the polarization beam apparatus 4 through the connection of monomode fiber, after 4 Polarization Control, light pulse is coupled in the general single mode fiber of positive dispersion, light pulse is through after the power amplification, can in the positive dispersion monomode fiber, produce very strong high-order polarity effect, the light pulse bundle that comes out from monomode fiber enters chirped mirror 5, light pulse makes light pulse obtain compression through after repeatedly reflecting in chirped mirror 5, be conveyed in the space through the light pulse of overcompression and be mapped to speculum 7 surfaces, incide speculum 14 surfaces through the light pulse after 7 reflections, enter into grating 11 from 14 light pulses that reflect, light pulse behind 11 diffraction becomes two bundles, this two-beam pulse is input in the concave mirror 12, after 12 reflections, become pair of parallel light, this two bundles directional light impinges perpendicularly on and carries out dispersion compensation in the spatial light modulator 16, spatial light modulator 16 is made for liquid crystal material, enter into concave mirror 13 through the light pulse bundle behind 16 dispersion compensations, reflex in the grating 10 through 13, incide speculum 15 surfaces through becoming a branch of light pulse after grating 10 interference, the surface of speculum 9 is incided in light pulse after 15 reflections, incide the surface of speculum 8 from the light pulse of 9 reflections, speculum 8 is parallel with 9, incide from the light pulse of speculum 8 reflection and to converge in the mirror 6, converge mirror 6 and be convex lens, 6 light pulses through overcompression and dispersion compensation are coupled in the polarizing beam splitter mirror 2 as feedback light, said process occurs in 2 one pulses of laser 1 input polarization beam splitter and also arrival of next pulse (being between two pulses of laser 1 ejaculation), be coupled to 2 light pulse from 6 this moment and be used as the input light source, enter into 4 from the light pulse of 2 outputs through 3 amplifications, repeat said process and carry out the compression second time, export through 4 through the light pulse that obtains suitable pulsewidth after 2 compressions (2 times compression process occurs between two pulses of laser 1).
Claims (4)
1, a kind of ultrashort laser pulse generator, it is characterized in that: this device includes following parts:
(1) 1 is mode locking semiconductor laser (LD), and it can launch the multiwavelength laser bundle that meets optical communication requirement wave band;
(2) 2,4 is polarization beam apparatus (PBS), the feedback of control beam, input and output;
(3) 3 is semiconductor amplifier, amplifies light pulse power;
(4) 6 for converging mirror;
(5) 5 is chirped mirror, and light pulse is compressed;
(6) 7,8,9,14,15 is the plated film plane mirror, changes light path;
(7) 12,13 is concave mirror, changes light beam;
(8) 10,11 is grating;
(9) 16 is spatial light modulator (SLM), compensation of dispersion.
2, parts according to claim 1 is characterized in that: (2) described parts are polarization beam apparatus, and they are made of polarization wafer and beam splitter.
3, parts according to claim 1 is characterized in that: (5) described parts are chirped mirror, are made of the speculum with mirror coating.
4, parts according to claim 1 is characterized in that: (9) described parts are spatial light modulator, and it is the modulator that is made of liquid crystal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101129187A CN1555111A (en) | 2003-12-26 | 2003-12-26 | Wavelength tunable 4 femtosecond super short optical pulse generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101129187A CN1555111A (en) | 2003-12-26 | 2003-12-26 | Wavelength tunable 4 femtosecond super short optical pulse generator |
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| Publication Number | Publication Date |
|---|---|
| CN1555111A true CN1555111A (en) | 2004-12-15 |
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| CNA2003101129187A Pending CN1555111A (en) | 2003-12-26 | 2003-12-26 | Wavelength tunable 4 femtosecond super short optical pulse generator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013627A (en) * | 2010-10-12 | 2011-04-13 | 深圳大学 | Linearly polarized chirped ultrashort laser pulse production technique and compensation technique |
| CN101611522B (en) * | 2006-09-18 | 2013-04-24 | 康奈尔研究基金会股份有限公司 | All-normal-dispersion femtosecond fiber laser |
| CN103343204A (en) * | 2013-07-19 | 2013-10-09 | 江苏大学 | Variable pulse width laser device |
| CN105826807A (en) * | 2016-05-13 | 2016-08-03 | 中山大学 | Full waveband-adjustable highly integrated femtosecond pulse chirped pulse amplify-broaden/compress device |
| CN107064919A (en) * | 2017-04-25 | 2017-08-18 | 西安电子科技大学 | The ultra-broadband signal method for parameter estimation being combined based on photoelectricity |
-
2003
- 2003-12-26 CN CNA2003101129187A patent/CN1555111A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101611522B (en) * | 2006-09-18 | 2013-04-24 | 康奈尔研究基金会股份有限公司 | All-normal-dispersion femtosecond fiber laser |
| CN102013627A (en) * | 2010-10-12 | 2011-04-13 | 深圳大学 | Linearly polarized chirped ultrashort laser pulse production technique and compensation technique |
| CN102013627B (en) * | 2010-10-12 | 2012-07-25 | 深圳大学 | Linearly polarized chirped ultrashort laser pulse production technique and compensation technique |
| CN103343204A (en) * | 2013-07-19 | 2013-10-09 | 江苏大学 | Variable pulse width laser device |
| CN105826807A (en) * | 2016-05-13 | 2016-08-03 | 中山大学 | Full waveband-adjustable highly integrated femtosecond pulse chirped pulse amplify-broaden/compress device |
| CN107064919A (en) * | 2017-04-25 | 2017-08-18 | 西安电子科技大学 | The ultra-broadband signal method for parameter estimation being combined based on photoelectricity |
| CN107064919B (en) * | 2017-04-25 | 2019-10-25 | 西安电子科技大学 | Based on the compound ultra-broadband signal method for parameter estimation of photoelectricity |
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