CN102252656A - All-fiber multi-wavelength emission source for satellite borne laser altimeter - Google Patents
All-fiber multi-wavelength emission source for satellite borne laser altimeter Download PDFInfo
- Publication number
- CN102252656A CN102252656A CN 201110193566 CN201110193566A CN102252656A CN 102252656 A CN102252656 A CN 102252656A CN 201110193566 CN201110193566 CN 201110193566 CN 201110193566 A CN201110193566 A CN 201110193566A CN 102252656 A CN102252656 A CN 102252656A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- seed light
- fiber
- wavelength
- source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to an all-fiber multi-wavelength emission source for a satellite borne laser altimeter. The emission source comprises a seed light system and an optical fiber amplification system and is characterized in that the seed light system is composed of a plurality of laser diodes emitting light with different wavelengths within the ion-doped gain spectrum width of an optical fiber amplification system, is modulated by a same code form and is coupled with laser outputted by an optical fiber through an optical multiplexer. The optical fiber amplification system is an all-fiber multi-stage cascade amplification system. The emission source is small-sized and all-fiber, has the characteristics of adjustable repetition frequency and modulation code form and high modulation speed, and can simultaneously amplify a plurality of wavelengths.
Description
Technical field
The present invention relates to a kind of fiber laser and amplifier, particularly a kind of emissive source of full optical fiber multi-wavelength satellite borne laser altitude gauge.
Background technology
Present spaceborne survey senior middle school adopts the laser instrument of high-peak power, burst pulse as measurement light source more, rely on the measurement pulse flight time directly to obtain range information, the peak power of this system requirements laser reaches tens MW class, repetition frequency can only arrive tens hertz, face of land resolution has only hundreds of rice, (face of land resolution is less than 20 meters not reach the requirement of high precision mapping, altimetry precision is less than 15 centimetres), the spaceborne holometer principle based on pseudo-random code modulation and photon counting has been proposed for this reason.Laser instrument through the pseudo-random code modulation sends the train of impulses of row through the pseudo-random code modulation, is also bringing more noise by increasing when number of symbols (being pulse sequence length) improves signal to noise ratio (S/N ratio); Although the single photon counting technology has very high detection sensitivity in addition, need can guarantee enough big signal to noise ratio (S/N ratio) through multiple averaging, promptly must solve the problem of photon accumulation.Many at present means by raising Laser emission repetition frequency reach the accumulation of photon, but from spaceborne angle, in order to overcome range ambiguity, need to reduce laser pulse emission repetition frequency, occur contradiction between the two.
Aspect laser emitting source, fiber laser was owing to had compact conformation, stability height in recent years, good beam quality, efficient advantages of higher are extensively paid attention to just gradually, become focus, the external laser emitting source of having developed full optical fiber, adopt seed source vibration-amplification (Master-Oscillator Power-Amplifier mostly, be designated hereinafter simply as MOPA) system, three grades of structure for amplifying of general employing, but mainly be to adopt continuous working method, and only amplify at certain specific wavelength.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of emissive source of multi-wavelength satellite borne laser altitude gauge is provided, this emissive source realizes receiving in the spaceborne altitude gauge accumulation of echo photon energy with the method for launching a plurality of wavelength simultaneously, thereby on the basis that does not increase laser pulse emission repetition frequency, solved the spaceborne energy accumulation of senior middle school and the contradiction between range ambiguity surveyed, improved the signal to noise ratio (S/N ratio) of spaceborne detection based on photon number.This emissive source has miniaturization, full optical fiber, repetition frequency and modulation format is adjustable, amplify several wavelength and the fast characteristics of modulation rate simultaneously.
For achieving the above object, technical solution of the present invention is as follows:
A kind of emissive source of full optical fiber multi-wavelength satellite borne laser altitude gauge, comprise seed light system and optical fiber amplification system, its characteristics are: described seed light system is that seed light source, coding demodulator, bundling device and the output optical fibre by a plurality of output different wave lengths within described optical fiber amplification system dopant ion gain spectrum width constitutes, and described optical fiber amplification system is full optical fiber multi-stage cascade structure for amplifying.
Described seed light system by first seed light source, second seed light source, protect inclined to one side bundling device and electrooptic modulator constitutes, described electrooptic modulator is worked under the acting in conjunction of stabilized voltage supply, signal generator and the microwave amplifier of band offset controller, the stabilized voltage supply of described band offset controller guarantees that modulator is operated in the distortion just bias point of avoiding signal, and described electrooptic modulator is a lithium niobate Mach-Zehnder electrooptic modulator.
Described seed light system is that signal generator, first seed light source, second seed light source, bundling device are connected and composed by optical fiber, described signal generator produces the electric current that changes by pseudo-random code and loads on first seed light source, second seed light source, and the seed light of output is coupled into described output optical fibre output by described bundling device.
Described first seed light source, second seed light source are the distributed feed-back formula laser diodes of linear polarization, tail optical fiber output.
Described optical fiber amplification system is full optical fiber three-stage cascade structure for amplifying, and the first order is linked to each other successively with first optical fiber filter by wavelength division multiplexer, first pumping source, first amplifying fiber, first fibre optic isolater and constitutes; The second level is made of first optical-fiber bundling device, second pumping source, second amplifying fiber, second fibre optic isolater and second optical fiber filter; The third level is linked to each other successively by second optical-fiber bundling device, the 3rd pumping source, the 3rd amplifying fiber and constitutes.
Described first amplifying fiber, second amplifying fiber and the 3rd amplifying fiber are Er
3+, Yb
3+The optical fiber of ion doping.
The present invention compared with prior art has the following advantages:
1, adopts multi-wavelength to amplify simultaneously, can increase extraction efficiency, reduction ASE, increase laser linewidth, the reduction nonlinear effect of pump energy in the amplification process.
2, make full use of Er
3+, Yb
3+Realize simultaneously amplifying Deng the absorption gain bandwidth (GB) of dopant ion broad seed light to several wavelength.Available Gain bandwidth as the Erbium-Doped Fiber Amplifier (EDFA) of present employing is 1530～1565nm, and the gain bandwidth (GB) of 20～40nm can satisfy the wavelength-division multiplex system of 4～32 path channels, promptly is equivalent to system's repetition frequency is improved 4～32 times.
3, the wavelength dependency of the modulation rate of utilizing electrooptic modulator to have fast (being fit to adopt the modulation of high speed pseudo-random code), performance is very little (is that adjustable bandwidth is wide, be suitable for simultaneously a plurality of different wavelength being amplified), optical loss is lower, electrooptical coefficient is high, be applicable to advantage such as multiple sign indicating number type, improves altimetry precision.
4, all optical fibre structure has effectively solved the power consumption of space application and the problem of thermal control aspect.
In a word, emissive source of the present invention has miniaturization, full optical fiber, repetition frequency and modulation format is adjustable, amplify several wavelength and the fast characteristics of modulation rate simultaneously, can be used for emissive source, to overcome range ambiguity and to realize the contradiction that photon energy is accumulated based on the spaceborne altitude gauge of photon counting.
Description of drawings
Fig. 1 is the overall schematic block diagram that the present invention is based on the multi-wavelength satellite borne laser altitude gauge emissive source of photon counting.
Fig. 2 is the seed light path synoptic diagram (is the example explanation with the dual wavelength) that the embodiment of the invention 1 is adopted.
Fig. 3 is the seed light path synoptic diagram (is the example explanation with the dual wavelength) that the embodiment of the invention 2 is adopted.
Fig. 4 is the light path synoptic diagram of the used optical fiber amplification system of the present invention.
Embodiment
The present invention is described further below in conjunction with drawings and Examples, but should not limit protection scope of the present invention with this.
Embodiment 1
See also Fig. 1, Fig. 2 and Fig. 4 earlier, Fig. 1 is the overall schematic block diagram of the emissive source of the full optical fiber multi-wavelength of the present invention satellite borne laser altitude gauge, Fig. 2 is an external modulation seed light synoptic diagram of the present invention, and Fig. 4 is the light path synoptic diagram of optical fiber amplification system of the present invention.
The described first seed light source 1101a of Fig. 2, the second seed light source 1101b are that form, that line is inclined to one side by 2 wavelength interval 2nm within optical fiber amplification system dopant ion gain spectrum width, the distributed feed-back formula laser diode of tail optical fiber output.The inclined to one side bundling device 1102 of described guarantor adopts protects inclined to one side dense wave division multiplexer; The seed light of different wave length is coupled into same optical fiber, and output is through modulated waveform behind electrooptic modulator 1103.Described modulator adopts lithium niobate Mach-Zehnder electrooptic modulator, its adopts traveling wave electrode can obtain very high operating rate (being fit to adopt the modulation of high speed pseudo-random code) and the wavelength dependency of performance very little (is that adjustable bandwidth is wide, be suitable for simultaneously a plurality of different wavelength being modulated), under the stabilized voltage supply 1103a, the signal generator 1103b that are with offset controller, microwave amplifier 1103c acting in conjunction, work.
Embodiment 2
See also Fig. 1, Fig. 3, Fig. 4 earlier, Fig. 1 is the overall schematic block diagram that the present invention is based on the full optical fiber multi-wavelength satellite borne laser altitude gauge emissive source of photon counting, Fig. 3 is a direct modulation seed light synoptic diagram of the present invention, and Fig. 4 is the light path synoptic diagram of optical fiber amplification system of the present invention.
The difference of present embodiment and embodiment 1 is that seed light adopts reactance modulation system, sees also Fig. 3, and Fig. 3 is the seed light path synoptic diagram that the embodiment of the invention 2 is adopted.Seed light described in the figure is connected and composed by optical fiber successively by signal generator 1201, the first seed light source 1202a, the second seed light source 1202b, bundling device 1203.The seed laser diode that employing can directly be modulated, producing the electric current that changes by pseudo-random code by signal generator loads on the seed laser diode, seed light after modulation is coupled into a branch of optical fiber amplification system that enters by bundling device, utilizes that the wide gain spectrum of optical fiber dopant ion such as Er3+, Yb3+ etc. is wide to be amplified simultaneously to 2 different wavelength.
Claims (6)
1. the emissive source of a full optical fiber multi-wavelength satellite borne laser altitude gauge, comprise seed light system (1) and optical fiber amplification system (2), it is characterized in that: described seed light system (1) is that seed light source, coding demodulator, bundling device and the output optical fibre by a plurality of output different wave lengths within described optical fiber amplification system dopant ion gain spectrum width constitutes, and described optical fiber amplification system (2) is full optical fiber multi-stage cascade structure for amplifying.
2. the emissive source of full optical fiber multi-wavelength satellite borne laser altitude gauge according to claim 1, it is characterized in that described seed light system (1) is by first seed light source (1101a), second seed light source (1101b), protecting inclined to one side bundling device (1102) and electrooptic modulator (1103) constitutes, described electrooptic modulator (1103) is in the stabilized voltage supply (1103a) of band offset controller, the acting in conjunction of signal generator (1103b) and microwave amplifier (1103c) is work down, the stabilized voltage supply of described band offset controller (1103a) guarantees that modulator is operated in the distortion just bias point of avoiding signal, and described electrooptic modulator is a lithium niobate Mach-Zehnder electrooptic modulator.
3. the emissive source of full optical fiber multi-wavelength satellite borne laser altitude gauge according to claim 1, it is characterized in that described seed light system (1) is that signal generator (1201), first seed light source (1202a), second seed light source (1202b), bundling device (1203) are connected and composed by optical fiber, described signal generator (1201) produces the electric current that changes by pseudo-random code and loads on first seed light source (1202a), second seed light source (1202b), and the seed light of output is coupled into described output optical fibre output by described bundling device (1203).
4. according to the emissive source of claim 2 or 3 described full optical fiber multi-wavelength satellite borne laser altitude gauges, it is characterized in that described first seed light source, second seed light source are the distributed feed-back formula laser diodes of linear polarization, tail optical fiber output.
5. according to the emissive source of claim 1,2 or 3 described full optical fiber multi-wavelength satellite borne laser altitude gauges, it is characterized in that described optical fiber amplification system (2) for full optical fiber three-stage cascade structure for amplifying, the first order is by wavelength division multiplexer (2011), first pumping source (2012), first amplifying fiber (2013), first fibre optic isolater (2014) and first optical fiber filter (2015) formation that links to each other successively; The second level is made of first optical-fiber bundling device (2021), second pumping source (2022), second amplifying fiber (2023), second fibre optic isolater (2024) and second optical fiber filter (2025); The third level is linked to each other successively by second optical-fiber bundling device (2031), the 3rd pumping source (2032), the 3rd amplifying fiber (2033) and constitutes.
6. the emissive source of full optical fiber multi-wavelength satellite borne laser altitude gauge according to claim 5 is characterized in that described first amplifying fiber (2013), second amplifying fiber (2023) and the 3rd amplifying fiber (2033) are Er
3+Or Yb
3+The optical fiber of ion doping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110193566 CN102252656A (en) | 2011-07-12 | 2011-07-12 | All-fiber multi-wavelength emission source for satellite borne laser altimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110193566 CN102252656A (en) | 2011-07-12 | 2011-07-12 | All-fiber multi-wavelength emission source for satellite borne laser altimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102252656A true CN102252656A (en) | 2011-11-23 |
Family
ID=44980073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110193566 Pending CN102252656A (en) | 2011-07-12 | 2011-07-12 | All-fiber multi-wavelength emission source for satellite borne laser altimeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102252656A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510927A (en) * | 2015-11-25 | 2016-04-20 | 中国科学院上海光学精密机械研究所 | Airborne frequency-division laser three-dimensional imaging apparatus and imaging method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5894492A (en) * | 1993-01-07 | 1999-04-13 | Sdl, Inc. | Semiconductor laser with integral spatial mode filter |
| US6061170A (en) * | 1998-03-16 | 2000-05-09 | Mcdonnell Douglas Corporation | Dual frequency laser amplifier array and operating method therefor |
| CN101482613A (en) * | 2009-02-18 | 2009-07-15 | 中国科学院上海光学精密机械研究所 | Human eye safety coherent Doppler wind-observation laser radar emission source |
| US20110038031A1 (en) * | 2009-08-17 | 2011-02-17 | Coherent, Inc. | Pulsed fiber-mopa with widely-variable pulse-duration |
-
2011
- 2011-07-12 CN CN 201110193566 patent/CN102252656A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5894492A (en) * | 1993-01-07 | 1999-04-13 | Sdl, Inc. | Semiconductor laser with integral spatial mode filter |
| US6061170A (en) * | 1998-03-16 | 2000-05-09 | Mcdonnell Douglas Corporation | Dual frequency laser amplifier array and operating method therefor |
| CN101482613A (en) * | 2009-02-18 | 2009-07-15 | 中国科学院上海光学精密机械研究所 | Human eye safety coherent Doppler wind-observation laser radar emission source |
| US20110038031A1 (en) * | 2009-08-17 | 2011-02-17 | Coherent, Inc. | Pulsed fiber-mopa with widely-variable pulse-duration |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510927A (en) * | 2015-11-25 | 2016-04-20 | 中国科学院上海光学精密机械研究所 | Airborne frequency-division laser three-dimensional imaging apparatus and imaging method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108663671B (en) | Laser radar system based on DWDM | |
| KR101915757B1 (en) | Optical pulse laser with low repetition rate and driving method of the same | |
| CN101499607B (en) | Single frequency pulse/continuous dual output optical fiber laser | |
| CN102263356B (en) | Single-frequency narrow line width polarization maintaining full-optical fiber pulse laser device | |
| CN102931574B (en) | Single-frequency nanosecond pulse fiber raman amplifier | |
| CN202512332U (en) | Full-optical fiber ultrashort laser pulse amplifier | |
| CN102749783A (en) | Raman optical fiber amplifier and detection method of loss of transmission optical fiber connector of Raman optical fiber amplifier | |
| CN201260023Y (en) | High power pulse optical fiber laser | |
| CN103323041A (en) | Distributed Brillouin optical fiber sensing system based on coherent detection | |
| CN112821178A (en) | Multi-beam pulse fiber laser | |
| CN110233413A (en) | A kind of multi-Wavelength Pulses optical fiber laser and laser radar system | |
| US6490077B1 (en) | Composite optical amplifier | |
| CN201374492Y (en) | High-power single-frequency pulse/continuous dual-output fiber laser | |
| CN107785771B (en) | Single-longitudinal-mode multi-wavelength tunable laser system and method for improving wavelength output efficiency | |
| CN103311786A (en) | Erbium-ytterbium doped fiber laser device for restraining Yb (ytterbium)-ASE (amplifier spontaneous emission) | |
| CN209913230U (en) | Multi-wavelength pulse fiber laser and laser radar system | |
| CN103296567A (en) | Ultra-narrow-linewidth nonlinear gain amplification multi-wavelength fiber laser | |
| CN101482613A (en) | Human eye safety coherent Doppler wind-observation laser radar emission source | |
| CN110838671A (en) | Single-frequency optical fiber laser | |
| CN102882108A (en) | Network coherent amplification method for all-fiber chirped pulses | |
| CN102252656A (en) | All-fiber multi-wavelength emission source for satellite borne laser altimeter | |
| CN103269012B (en) | Single-frequency Raman optical fiber laser device system | |
| CN206834505U (en) | A kind of ASE light sources of high mean wavelength stability | |
| CN103594912A (en) | Super-fluorescence optical fiber source amplifying system | |
| CN114709705A (en) | Echo signal time-sharing amplification laser for coherent laser radar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111123 |