CN1904710A - Method and apparatus for multi-wavelength stable output of line type structure optical fiber laser - Google Patents
Method and apparatus for multi-wavelength stable output of line type structure optical fiber laser Download PDFInfo
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- CN1904710A CN1904710A CN 200610052881 CN200610052881A CN1904710A CN 1904710 A CN1904710 A CN 1904710A CN 200610052881 CN200610052881 CN 200610052881 CN 200610052881 A CN200610052881 A CN 200610052881A CN 1904710 A CN1904710 A CN 1904710A
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Abstract
The invention relates to a multi-wavelength stable output method and its device of linear structure optical fiber laser based on the mixing gain of fiber Raman amplifiers and erbium-doped optical fiber amplifier. It includes optical fiber annular lens, optical coupler, fiber Raman amplifiers, erbium-doped optical fiber amplifier, and Sagnac ring filter. The Sagnac ring filter includes two polarisation controllers whose one end are respectively connected with synthetic end of the 3dB optical coupler. The invention combines the fiber Raman amplifiers and the erbium-doped optical fiber amplifier to restrain wavelength competition characteristic of the latter to realize optical fiber laser multi-wavelength stable output.
Description
Technical field
The invention belongs to the fiber laser field, particularly a kind of method and equipment of the linear structure fiber laser multi-wavelength stable output based on fiber Raman amplifier Erbium-Doped Fiber Amplifier (EDFA) hybrid gain.
Background technology
Along with the development of optical communication technique and optical fiber sensing technology, multi-wavelength optical fiber laser becomes the focus that people pay close attention to day by day.Multi-wavelength optical fiber laser has advantages such as multi-wavelength output, cost are low, optical fiber compatibility, in fields such as optical communication system, sensor-based system, industrial processes, monitorings important use is arranged.Face a difficulty as erbium doped fiber laser at present commonly used when realizing multi-wavelength work, promptly the Er-doped fiber under the normal temperature has very big uniform gain live width (have strong gain competition between a plurality of wavelength and cause the output power instability).There have been some technology to be used to solve the problem of gain competition between the erbium doped fiber laser different wave length.Such as adopting liquid nitrogen that Er-doped fiber is cooled to liquid nitrogen temperature (77K), under such low temperature environment, thereby the even broadening of Er-doped fiber can effectively be suppressed to realize the work of fiber laser multi-wavelength.Again such as adopting the frequency displacement feedback technique or adopting special optical fiber (as high non-linear photon crystal optical fiber).The method of the multi-wavelength work of erbium doped fiber laser exists Optical Maser System system complex cost high or need shortcoming such as special fiber under several realization normal temperature of minority.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, proposed a kind of method of exporting based on the linear structure fiber laser multi-wavelength stable of fiber Raman amplifier Erbium-Doped Fiber Amplifier (EDFA) hybrid gain, the equipment of this method of realization is provided simultaneously.
Method of the present invention may further comprise the steps:
(1), selects the fiber Raman amplifier and the Erbium-Doped Fiber Amplifier (EDFA) of corresponding gain margin for use according to the output wavelength scope of the required multi-wavelength optical fiber laser that obtains;
(2) at interval according to the output wavelength of the required multi-wavelength optical fiber laser that obtains, select for use hi bi birefringence fiber to form the Sagnac loop filter, there are following relation in wavelength interval Δ λ and central wavelength lambda, hi bi birefringence fiber birefraction Δ n and length L:
Δλ＝λ
2/(Δn·L) (1)
(3) select operating wavelength range to cover the fiber loop mirror and the photo-coupler of the output wavelength scope of the multi-wavelength optical fiber laser that need obtain, photo-coupler output power proportion by subtraction scope is 1: 1～1: 99;
(4) open Erbium-Doped Fiber Amplifier (EDFA), fiber Raman amplifier, regulate two Polarization Controllers in the Sagnac loop filter, laser instrument is realized multi-wavelength output.
The equipment of realizing the inventive method comprises that wherein an end of the little proportion by subtraction of photo-coupler is as the laser output mouth by fiber loop mirror, photo-coupler, fiber Raman amplifier, Erbium-Doped Fiber Amplifier (EDFA) and the Sagnac loop filter of optical fiber series connection.The Sagnac loop filter comprises two Polarization Controllers that are connected on the hi bi birefringence fiber two ends by optical fiber, and the other end of two Polarization Controllers is connected with the port in the same way of 3dB photo-coupler respectively.
Described series connection is an end that fiber loop mirror is connected photo-coupler, the other end of photo-coupler connects an end of Erbium-Doped Fiber Amplifier (EDFA), the other end of Erbium-Doped Fiber Amplifier (EDFA) connects an end of fiber Raman amplifier, and the other end of fiber Raman amplifier connects the Sagnac loop filter.
Described series connection is that fiber loop mirror is connected the end that fiber Raman amplifies photo-coupler, one end of the other end connector of photo-coupler, the other end of fiber Raman amplifier connects an end of Erbium-Doped Fiber Amplifier (EDFA), and the other end of Erbium-Doped Fiber Amplifier (EDFA) connects the Sagnac loop filter.
Described series connection is an end that fiber loop mirror is connected fiber Raman amplifier, the other end of fiber Raman amplifier connects an end of photo-coupler, the other end of photo-coupler connects an end of Erbium-Doped Fiber Amplifier (EDFA), and the other end of Erbium-Doped Fiber Amplifier (EDFA) connects the Sagnac loop filter.
Described series connection is an end that fiber loop mirror is connected Erbium-Doped Fiber Amplifier (EDFA), the other end of Erbium-Doped Fiber Amplifier (EDFA) connects an end of photo-coupler, the other end of photo-coupler connects an end of fiber Raman amplifier, and the other end of fiber Raman amplifier connects the Sagnac loop filter.
Described series connection is an end that fiber loop mirror is connected Erbium-Doped Fiber Amplifier (EDFA), the other end of Erbium-Doped Fiber Amplifier (EDFA) connects an end of fiber Raman amplifier, the other end of fiber Raman amplifier connects an end of photo-coupler, and the other end of photo-coupler connects the Sagnac loop filter.
Described series connection is an end that fiber loop mirror is connected fiber Raman amplifier, the other end of fiber Raman amplifier connects an end of Erbium-Doped Fiber Amplifier (EDFA), the other end of Erbium-Doped Fiber Amplifier (EDFA) connects an end of photo-coupler, and the other end of photo-coupler connects the Sagnac loop filter.
The present invention mainly is applicable in optical communication, light sensing.The present invention has adopted the hybrid gain of fiber Raman amplifier and Erbium-Doped Fiber Amplifier (EDFA), because fiber Raman amplifier is based on the function of the media implementation light amplification of inhomogeneous broadening at normal temperatures, the mixing of fiber Raman amplifier and Erbium-Doped Fiber Amplifier (EDFA) is used and has been suppressed the wavelength Competition Characteristics of Erbium-Doped Fiber Amplifier (EDFA), thereby has realized the stable output of fiber laser multi-wavelength.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is another structural representation of the present invention;
Fig. 3 is an another structural representation of the present invention;
Fig. 4 is an another structural representation of the present invention;
Fig. 5 is an another structural representation of the present invention;
Fig. 6 is an another structural representation of the present invention;
Fig. 7 is the laser output spectrum figure of one embodiment of the invention.
Embodiment
Selecting gain margin for use is fiber Raman amplifier 3 and the Erbium-Doped Fiber Amplifier (EDFA) 4 of 1560nm to 1570nm; The selection work scope is fiber loop mirror light 1 and the photo-coupler 2 of 1530nm to 1580nm, and an end of photo-coupler 2 little proportions by subtraction (2%) is as the laser output mouth.Sagnac loop filter 9 comprises by optical fiber and is connected on the Polarization Controller 6 at hi bi birefringence fiber 7 two ends and the other end of 8, two Polarization Controllers of another Polarization Controller is connected with the port in the same way of 3dB photo-coupler 5 respectively.Hi bi birefringence fiber 7 length are 15.2m, and birefraction is 0.00032.According to formula (1), output wavelength is spaced apart 0.5nm.
As shown in Figure 1, adopt first kind of structure, fiber loop mirror light 1 connects an end of photo-coupler 2, the other end of photo-coupler 2 connects an end of fiber Raman amplifier 3, the other end of fiber Raman amplifier 3 connects an end of Erbium-Doped Fiber Amplifier (EDFA) 4, and the other end of Erbium-Doped Fiber Amplifier (EDFA) 4 connects Sagnac loop filter 9.
As shown in Figure 2, adopt second kind of structure, fiber loop mirror light 1 connects an end of photo-coupler 2, the other end of photo-coupler 2 connects an end of Erbium-Doped Fiber Amplifier (EDFA) 3, the other end of Erbium-Doped Fiber Amplifier (EDFA) 3 connects an end of fiber Raman amplifier 4, and the other end of fiber Raman amplifier 4 connects Sagnac loop filter 9.
As shown in Figure 3, adopt the third structure, fiber loop mirror light 1 connects an end of fiber Raman amplifier 3, fiber Raman amplifier 3 other ends connect an end of photo-coupler 2, the other end of photo-coupler 2 connects an end of Erbium-Doped Fiber Amplifier (EDFA) 4, and the other end of Erbium-Doped Fiber Amplifier (EDFA) 4 connects Sagnac loop filter 9.
As shown in Figure 4, adopt the 4th kind of structure, fiber loop mirror light 1 connects an end of Erbium-Doped Fiber Amplifier (EDFA) 4, the other end of Erbium-Doped Fiber Amplifier (EDFA) 4 connects an end of photo-coupler 2, the other end of photo-coupler connects an end of fiber Raman amplifier 3, and the other end of fiber Raman amplifier 3 connects Sagnac loop filter 9.
As shown in Figure 5, adopt the 5th kind of structure, fiber loop mirror light 1 connects an end of Erbium-Doped Fiber Amplifier (EDFA) 4, the other end of Erbium-Doped Fiber Amplifier (EDFA) 4 connects an end of fiber Raman amplifier 3, the other end of fiber Raman amplifier 3 connects an end of photo-coupler 2, and the other end of photo-coupler 2 connects Sagnac loop filter 9.
As shown in Figure 6, adopt the 6th kind of structure, fiber loop mirror light 1 connects an end of fiber Raman amplifier 3, the other end of fiber Raman amplifier 3 connects an end of Erbium-Doped Fiber Amplifier (EDFA) 4, the other end of Erbium-Doped Fiber Amplifier (EDFA) 4 connects an end of photo-coupler 2, and the other end of photo-coupler 2 connects Sagnac loop filter 9.
Open fiber Raman amplifier 3 and Erbium-Doped Fiber Amplifier (EDFA) 4, regulate a Polarization Controller 6 and another Polarization Controller 8 in the Sagnac loop filter, we obtain the output spectra of multi-wavelength optical fiber laser of 12 Wavelength stabilized outputs shown in Fig. 7 (a), the output of multi-wavelength optical fiber laser is stable, be shown in 15 minutes the continuous sweep laser instrument output jitter as Fig. 7 (b) and realized the stable output of fiber laser multi-wavelength less than 0.37dB.
Claims (2)
1, the method for linear structure fiber laser multi-wavelength stable output is characterized in that this method may further comprise the steps:
(1), selects the fiber Raman amplifier and the Erbium-Doped Fiber Amplifier (EDFA) of corresponding gain margin for use according to the output wavelength scope of the required multi-wavelength optical fiber laser that obtains;
(2) at interval according to the output wavelength of the required multi-wavelength optical fiber laser that obtains, select for use hi bi birefringence fiber to form the Sagnac loop filter, there are following relation in wavelength interval Δ λ and central wavelength lambda, hi bi birefringence fiber birefraction Δ n and length L:
Δλ＝λ
2/(Δn·L)
(3) select operating wavelength range to cover the fiber loop mirror and the photo-coupler of the output wavelength scope of the multi-wavelength optical fiber laser that need obtain, photo-coupler output power proportion by subtraction scope is 1: 1～1: 99;
(4) open Erbium-Doped Fiber Amplifier (EDFA), fiber Raman amplifier, regulate two Polarization Controllers in the Sagnac loop filter, laser instrument is realized multi-wavelength output.
2, adopt the employed equipment of claim 1 method, it is characterized in that this equipment comprises that wherein an end of the little proportion by subtraction of photo-coupler is as the laser output mouth by fiber loop mirror, photo-coupler, fiber Raman amplifier, Erbium-Doped Fiber Amplifier (EDFA) and the Sagnac loop filter of optical fiber series connection; Described Sagnac loop filter comprises two Polarization Controllers that are connected on the hi bi birefringence fiber two ends by optical fiber, and the other end of two Polarization Controllers is connected with the port in the same way of 3dB photo-coupler respectively.
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| CNB2006100528817A CN100416396C (en) | 2006-08-10 | 2006-08-10 | Method and apparatus for multi-wavelength stable output of line type structure optical fiber laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067484A (en) * | 2008-12-08 | 2011-05-18 | 诺基亚西门子通信公司 | Coherent optical system comprising a tunable local oscillator |
| CN102098107A (en) * | 2011-01-13 | 2011-06-15 | 浙江大学 | Ultra wideband pulse signal generator |
| CN102410990A (en) * | 2011-08-01 | 2012-04-11 | 暨南大学 | High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof |
| CN101771232B (en) * | 2008-12-31 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Sigma cavity ultrashort pulse fiber laser with variable output rate |
| CN103368045A (en) * | 2013-07-04 | 2013-10-23 | 中国科学院上海光学精密机械研究所 | Narrow-linewidth single-frequency fiber laser based on all-fiber slow-light element |
| CN110658662A (en) * | 2019-08-27 | 2020-01-07 | 同济大学 | MM-EDFA-based hybrid multimode amplifier and implementation method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE275766T1 (en) * | 2003-01-13 | 2004-09-15 | Alcatel Sa | RAMAN AMPLIFIER AND METHOD FOR EXCITING A RAMAN AMPLIFIER |
| CN2631132Y (en) * | 2003-07-03 | 2004-08-04 | 复旦大学 | Mixed broadband optical fiber amplifier |
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2006
- 2006-08-10 CN CNB2006100528817A patent/CN100416396C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067484A (en) * | 2008-12-08 | 2011-05-18 | 诺基亚西门子通信公司 | Coherent optical system comprising a tunable local oscillator |
| CN102067484B (en) * | 2008-12-08 | 2015-11-25 | 骁阳网络有限公司 | The method of the data processing in optical-fiber network and optical-fiber network parts and communication system |
| CN101771232B (en) * | 2008-12-31 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Sigma cavity ultrashort pulse fiber laser with variable output rate |
| CN102098107A (en) * | 2011-01-13 | 2011-06-15 | 浙江大学 | Ultra wideband pulse signal generator |
| CN102410990A (en) * | 2011-08-01 | 2012-04-11 | 暨南大学 | High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof |
| CN103368045A (en) * | 2013-07-04 | 2013-10-23 | 中国科学院上海光学精密机械研究所 | Narrow-linewidth single-frequency fiber laser based on all-fiber slow-light element |
| CN110658662A (en) * | 2019-08-27 | 2020-01-07 | 同济大学 | MM-EDFA-based hybrid multimode amplifier and implementation method |
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| CN100416396C (en) | 2008-09-03 |
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