CN1595277A - Reflection-type separated Raman fibre amplifier - Google Patents
Reflection-type separated Raman fibre amplifier Download PDFInfo
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- CN1595277A CN1595277A CNA2004100413354A CN200410041335A CN1595277A CN 1595277 A CN1595277 A CN 1595277A CN A2004100413354 A CNA2004100413354 A CN A2004100413354A CN 200410041335 A CN200410041335 A CN 200410041335A CN 1595277 A CN1595277 A CN 1595277A
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- 239000000835 fiber Substances 0.000 title claims abstract description 71
- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims description 58
- 230000003287 optical effect Effects 0.000 claims description 52
- 239000004065 semiconductor Substances 0.000 claims description 39
- 239000013307 optical fiber Substances 0.000 claims description 36
- 230000010287 polarization Effects 0.000 claims description 33
- 238000005253 cladding Methods 0.000 claims description 32
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 description 13
- 230000002457 bidirectional effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000003321 amplification Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
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- 239000006185 dispersion Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 229910052691 Erbium Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- -1 rare earth ions Chemical class 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
It is a reflection discrete Raman light fiber amplifier, which is a light amplifier and comprises the following: pump unit 1, light ring device 2, light couple 3, gain light fiber 4 and light separator. The output end of the pump unit is connected with input end of light separator; the output end of the light separator is connected with the input end of light couple; the input end of signal light is connected with first end of the light ring device; the output end of signal light is connected with second end of light ring device; the third end of the light ring device is connected with input end of light couple; the output end of light couple is connected with gain light fiber which is a double-layer fiber with one end coated with metal film and comprises fiber core, inner layer and outer layer and its reflection ratio changes as that of core fiber is larger than inner layer and that of inner layer is larger than outer layer.
Description
Technical Field
The invention relates to an optical amplifier, in particular to a discrete Raman fiber amplifier, belonging to the technical field of fiber communication.
Technical Field
The optical amplifier technology is an indispensable key technology in a new generation of optical fiber communication system, and has the functions of real-time, online, broadband, high gain, low noise, low power consumption and transparent direct amplification of wavelength, rate and modulation mode of optical signals. The technology not only solves the limitation of optical fiber loss on the transmission distance of an optical network, but also creates a wavelength division multiplexing technology, and lays an important technical foundation for realizing ultra-high-speed, ultra-large-capacity and ultra-long-distance Wavelength Division Multiplexing (WDM), Dense Wavelength Division Multiplexing (DWDM), all-optical transmission and the like.
The optical amplifier generally comprises a gain medium, a pumping source and an input-output coupling structure, and has the function of optically amplifying multiplexed optical signals so as to prolong the optical cable transmission distance of a unrepeatered system or a non-regenerative system. There are several typical optical amplifiers including Erbium Doped Fiber Amplifiers (EDFAs) and Fiber Raman Amplifiers (FRAs).
Typical EDFAs consist primarily of a pump laser (operating wavelength of 980nm or 1480nm), an optical combiner, an optical isolator, and erbium doped fiber. The EDFA forms population inversion by using rare earth ions doped in the erbium-doped fiber under the action of pump light to generate stimulated radiation, so that optical gain is provided for signal light. The working range of the conventional EDFA is 1530-1565 nm, and the relatively flat part of the gain spectrum is 1540-1560 nm. This narrow bandwidth range, defined by its operating mechanism, has become increasingly inadequate for the demand of today's communication systems to further increase communication capacity.
The raman amplifier is a new type of optical fiber amplifier based on the stimulated raman scattering effect generated by strong pump beams through the fiber. Stimulated raman scattering transfers a small portion of the incident power from a beam to a stokes wave of lower frequency than it, and a weak signal can be amplified by an optical fiber if it is transmitted in the fiber simultaneously with a strong pump light and the weak signal wavelength is within the raman gain spectral bandwidth of the pump light wave. Because the FRA gain wavelength is determined by the wavelength of the pump light, the gain can be provided for any wavelength, so that the FRA can realize amplification in a waveband which cannot be amplified by the EDFA, and the FRA has irreplaceable effect on developing the whole low-loss region 1270-1670 nm of the optical fiber.
The fiber raman amplifier may be classified into a discrete raman amplifier and a distributed raman amplifier. The distributed Raman amplifier utilizes the transmission fiber as a gain medium, and the main auxiliary EDFA is used for improving the performance of a DWDM communication system, inhibiting the nonlinear effect and improving the signal-to-noise ratio. The optical fiber gain medium used by the discrete Raman amplifier is relatively short, the pumping power requirement is very high, high gain of more than 40dB can be generated, and the discrete Raman amplifier is mainly used for wave bands which cannot be amplified by the EDFA, such as 1300nm, 1400nm or S wave bands.
In a discrete fiber raman amplifier, a gain fiber and a pump source are selected according to a specific gain requirement, and a plurality of pump wavelengths are generally selected to realize gain flattening. The discrete raman amplifier has a high requirement on the pump power, and because only part of the pump light is utilized and the rest is filtered by the isolator, the utilization efficiency of the pump light is low, so the problems of improving the utilization rate of the pump light of the discrete fiber raman amplifier and reducing the cost are very important.
In order to meet the requirement of high gain in a discrete Raman amplifier, rare earth particles with high doping concentration (such as germanium) and small effective fiber core area A (typical value is 10-20 μm)2) The silica-based optical fiber is used as a gain medium. The nonlinear refractive index n of the gain fiber2the/A is very large, resulting in enhanced nonlinear effects of SPM, XPM, FWM, etc. Meanwhile, the small effective core area increases the bidirectional rayleigh scattering, which causes multipath interference (MPI) deterioration and reduces the system performance. In addition, the negative dispersion of such gain fibers is large, typically around-20 to-30 ps/nm/km. Large dispersion fibers, while helpful in suppressing FWM effects, are disadvantageous in dispersion management systems. On the other hand, a common single-mode doped fiber is composed of a fiber core and a single cladding, and both pump light and signal light propagate in the fiber core. Because the effective fiber core area of the single mode fiber is small, the efficiency of directly coupling the pump light into the fiber core is low. This is achieved byIn addition, in a discrete fiber raman amplifier, a gain medium fiber as long as several kilometers needs to be placed inside the amplifier, resulting in a large volume of the device.
Therefore, the discrete raman amplifier needs to solve the problems of how to improve the utilization efficiency of the pump light, reduce the size, and suppress the nonlinearity.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a reflection-type discrete Raman fiber amplifier based on a cladding pumping technology. By using the structure, the total gain of the amplifier can be greatly improved, the volume of the discrete fiber Raman amplifier is reduced, and the cost is reduced.
The technical scheme is as follows: the invention adopts a section of double-clad optical fiber with a coated film on a single end surface as a gain medium of a Raman amplifier, and the designed reflection-type discrete Raman optical fiber amplifier based on the cladding pumping technology comprises a pumping unit, an optical circulator, an optical coupler, a gain optical fiber and an optical isolator; the output end of the pumping unit is connected with the input end of the optical isolator, and the output end of the optical isolator is connected with the input end of the optical coupler; the signal light input end is connected with the first port of the optical circulator, the signal light output end is connected with the second port of the optical circulator, and the third port of the optical circulator is connected with the input end of the optical coupler; the output end of the optical coupler is connected with a gain optical fiber, the gain optical fiber is a section of double-clad optical fiber, one end face of the gain optical fiber is coated with a metal film, the double-clad optical fiber is composed of a fiber core, an inner cladding and an outer cladding, the refractive index changes along the radial direction, the fiber core is larger than the inner cladding, and the inner cladding is larger than the outer cladding.
The pumping unit utilizing the polarization coupling scheme consists of a semiconductor laser, a first polarization coupler, a second polarization coupler and a wave combiner; the semiconductor laser is a vertical polarization semiconductor laser with the same wavelength, and the output end of the semiconductor laser is connected with the first polarization coupler; the semiconductor laser is a vertical polarization semiconductor laser with the same wavelength, and the output end of the semiconductor laser is connected with the second polarization coupler; the output ends of the first polarization coupler and the second polarization coupler are connected with a wave combiner, and the output end of the wave combiner is connected with the output end of the pump light.
The pumping unit using the scheme of the depolarizer consists of a semiconductor laser, a wave combiner and a depolarizer, wherein the output end of the semiconductor laser is connected with the wave combiner, the output end of the wave combiner is connected with the depolarizer, and the output end of the depolarizer is connected with the output end of pumping light.
The pump laser may be a high power multimode semiconductor laser. In view of gain flatness, the LD array is often composed of pump lasers at several wavelengths, and the specific pump wavelength and power are selected according to the gain requirement of the amplifier. In order to reduce the polarization dependence of the raman gain of the signal light, two lasers having close wavelengths are generally polarization-coupled, and the pump powers in two electric field directions perpendicular to each other in the gain medium are made substantially equal. However, this method increases the number of pump lasers and increases the system cost. So that a single pump laser plus depolarizer scheme can also be used.
The gain fiber is composed of a section of double-clad fiber, wherein one end face of the fiber is plated with a metal film, and a reflecting surface is formed for both signal light and pump light. The signal light enters the non-film-coated port of the double-clad optical fiber through the optical circulator, and the depolarized pump light is coupled with the signal light through the WDM. The pump light and the signal light are reflected by a reflecting film at the other port of the double-clad fiber and then pass through the double-clad fiber again, and the amplified signal light is reversely output through the optical circulator.
The technical effects are as follows: the reflection-type discrete Raman fiber amplifier based on the cladding pumping technology has the following obvious advantages:
(1) the existence of the reflecting film on the end face of the double-clad optical fiber enables the signal light and the pump light to pass through the gain optical fiber twice in a reciprocating manner. The total gain of the amplifier can be increased by 2 to 4 times because the utilization efficiency of the pumping light and the gain fiber is greatly improved.
(2) A cladding pumping technique is used. The attenuation of the pump light in the longitudinal direction due to the amplification of the signal light is significantly reduced compared to a single-mode optical fiber, thereby further increasing the gain of the amplifier. On the other hand, the pump light is no longer required to be single-mode laser light, and a high-power multimode semiconductor laser can be used as a pump source.
(3) The reflection of the pump light realizes the effect of obtaining a bidirectional pumping mode by injecting the pump light at a single end, saves the number of pump lasers, and simultaneously achieves the purposes of inhibiting nonlinearity, reducing crosstalk and improving noise.
(4) The cost is lower, and the design is simple and convenient.
Therefore, the reflection-type discrete Raman fiber amplifier based on the cladding pumping technology has the advantages of high gain, small nonlinear effect influence, small crosstalk, low noise and the like, low cost, simple design and the like.
In the reflection-type discrete Raman fiber amplifier based on the cladding pumping technology, the reflection film is used, and the effect of a bidirectional pumping mode is obtained only by injecting pumping light into a single end.
Drawings
Fig. 1 is a schematic structural diagram of a reflection-type discrete raman fiber amplifier based on a cladding pumping technology, which includes a pumping unit 1, an optical circulator 2, a WDM coupler 3, a gain fiber 4, a metal film 4.1, and an optical isolator 5. Signal light input 6, signal light output 7.
Fig. 2 is a schematic diagram of a pump unit using a polarization coupling scheme (taking pump light with two wavelengths as an example), which includes semiconductor lasers 1.11-1.14, polarization couplers 1.3, 1.4, a wave combiner 1.5, and a pump light output end 1.6.
Fig. 3 is a schematic diagram of a pump unit using a depolarizer scheme (taking pump light with two wavelengths as an example), which includes semiconductor lasers 1a-1b with different wavelengths, a combiner 1c, a depolarizer 1d, and a pump light output terminal 1 e.
Detailed Description
The invention relates to a reflection-type discrete Raman fiber amplifier, which consists of a pumping unit and a gain fiber, wherein the amplifier comprises a pumping unit 1, an optical circulator 2, an optical coupler 3, a gain fiber 4 and an optical isolator 5; the output end of the pumping unit 1 is connected with the input end of the optical isolator 5, and the output end of the optical isolator 5 is connected with the input end of the optical coupler 3; the signal light input end 6 is connected with a first port 21 of the optical circulator 2, the signal light output end 7 is connected with a second port 22 of the optical circulator 2, and a third port 23 of the optical circulator 2 is connected with the input end of the optical coupler 3; the output end of the optical coupler 3 is connected with a gain optical fiber 4, the gain optical fiber 4 is a section of double-clad optical fiber, one end face of the double-clad optical fiber is coated with a metal film 4.1, the double-clad optical fiber is composed of a fiber core, an inner cladding and an outer cladding, the refractive index changes along the radial direction, the fiber core is larger than the inner cladding, and the inner cladding is larger than the outer cladding.
The pump unit 1 utilizing the polarization coupling scheme is composed of semiconductor lasers 1.11-1.14, a first polarization coupler 1.3, a second polarization coupler 1.4 and a wave combiner 1.5; the semiconductor lasers 1.11 and 1.12 are vertical polarized semiconductor lasers with the same wavelength, and the output end of the semiconductor lasers is connected with the first polarization coupler 1.3; the semiconductor lasers 1.13 and 1.14 are semiconductor lasers with the same wavelength and vertical polarization, and the output end of the semiconductor lasers is connected with the second polarization coupler 1.4; the output ends of the first polarization coupler 1.3 and the second polarization coupler 1.4 are connected with a wave combiner 1.5, and the output end of the wave combiner 1.5 is connected with a pump light output end 1.6.
The pumping unit 1 using the depolarizer scheme is composed of semiconductor lasers 1a and 1b, a combiner 1c and a depolarizer 1d, the output ends of the semiconductor lasers 1a and 1b are connected with the combiner 1c, the output end of the combiner 1c is connected with the depolarizer 1d, and the output end of the depolarizer 1d is connected with a pumping light output end 1 e.
A section of gain optical fiber 4 with a single end surface plated with a metal film 4.1 is adopted as a Raman amplifierThe gain medium of (1). The pumping unit 1 is composed of a high-power multimode semiconductor laser LD array (to select two pumping wavelengths lambda)1And λ2For example). If polarization coupling scheme is adopted for depolarization, the pump unit operates at lambda1Semiconductor lasers 1.11, 1.12 at λ 2 and with mutually perpendicular directions of polarization and semiconductor lasers 1.13, 1.14 operating at λ 2 and with mutually perpendicular directions of polarization. The pump light emitted by the semiconductor lasers 1.11 and 1.12 and the pump light emitted by the semiconductor lasers 1.13 and 1.14 are coupled by the polarization couplers 1.3 and 1.4 respectively, then coupled by the wave combiner 1.5, and finally output by the pump light output end 1.6. If a depolarizer is used (e.g. depolarizer which is simultaneously suitable for several wavelengths), the pump unit comprises a semiconductor laser 1a at λ 1 and λ2 A semiconductor laser 1 b. The pumping light emitted by the light sources 1a and 1b is synthesized by the wave synthesizer 1c, then depolarized by the depolarizer 1d, and finally output by the pumping light output end 1 e.
The gain fiber 4 is a double-clad fiber, one end surface of which is plated with a metal film 4.1 (such as a gold film), and the gain fiber forms a reflecting surface for both signal light and pump light, and the reflectivity is more than 90%. The rare-earth ion doped in the core of the double-clad optical fiber can be Yb3+、Nd3+And the like.
The signal light enters the optical circulator 2 from the signal light input end 6, and then enters the uncoated port of the gain optical fiber 4 through the WDM coupler 3. The pump light emitted by the pump unit 1 passes through the optical isolator 5 and then enters the WDM coupler 3 to be coupled with the signal light. Thereafter, the signal light and the pump light pass through the double-clad gain fiber 4, and are then reflected by the other end face coated with the metal film 4.1. Finally, the amplified signal light is reversely output from the signal light output end 7 through the optical circulator 2.
The optical isolator 5 functions to prevent the reflected pump light from entering the pumping unit 1.
The working principle is as follows:
fiber raman amplifiers are based on a stimulated raman scattering mechanism in the fiber. In the case of continuous waves, the interaction process of the pump wave and the stokes wave can be analyzed by the following coupling equation:
in the formula, apAnd asCross sections of pump light and signal light, alphapAnd alphasOptical fiber losses at pump and signal wavelengths, respectively, upsilonpAnd upsilonsRespectively, pump light and signal light frequency, PpAnd PsPump light and signal light power, respectively.
Under the condition of small-signal amplification, neglecting the first loss of the (1.2) type right pump light, the output power of the raman amplifier can be solved as follows:
in the formula <math> <mrow> <msub> <mi>L</mi> <mi>eff</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <msub> <mi>α</mi> <mi>p</mi> </msub> </mfrac> <mo>[</mo> <mn>1</mn> <mo>-</mo> <mi>exp</mi> <mrow> <mo>(</mo> <msub> <mi>α</mi> <mi>p</mi> </msub> <mi>L</mi> <mo>)</mo> </mrow> <mo>]</mo> </mrow> </math> To account for fiber loss versus effective length of the pump at absorption. Thus, the small signal gain of the raman amplifier is:
wherein,
thus, it can be seen that in the unsaturated range, the small signal gain of the raman amplifier is approximately linear with injected pump power, increasing with increasing pump power.
In the reflection-type discrete Raman fiber amplifier based on the cladding pumping technology, the signal light and the pumping light pass through the gain fiber twice in a reciprocating manner by utilizing the reflecting surface, so that the utilization rate of the pumping light is improved, the Raman action distance between the signal light and the pumping light is prolonged, and the gain can be improved to 2 to 4 times.
The double-clad optical fiber is composed of a fiber core, an inner cladding and an outer cladding. The refractive index varies radially such that the core is larger than the inner cladding, which is larger than the outer cladding. The pump light propagates in the inner cladding and repeatedly passes through the doped core in a zigzag manner, while the signal light propagates in the doped core. The larger inner cladding aperture can improve the efficiency of directly coupling the pump light into the optical fiber and obviously reduce the attenuation of the pump light along the longitudinal direction caused by the amplification of the signal light so as to further improve the total gain of the amplifier.
The pumping mode of the Raman amplifier can adopt a forward pumping mode, a backward pumping mode or a bidirectional pumping mode. Forward pumping will couple the power perturbation of the pump light to the signal light, but the ASE noise is smaller than backward pumping. The backward pumping mode has small polarization dependence, small disturbance between a signal and pump light, and extremely uneven noise spectrum. The bidirectional pumping mode has the advantages of both forward and backward pumping modes. In addition, in the bidirectional pumping mode, the power fluctuation of signals along the gain fiber is small and basically kept unchanged, so that the nonlinear effect can be greatly inhibited, and the crosstalk and the noise are reduced. In the reflection-type discrete Raman fiber amplifier based on the cladding pumping technology, the reflection film is used, and the effect of a bidirectional pumping mode is obtained only by injecting pumping light into a single end.
The invention adopts the cladding pumping technology with large transverse size and large numerical aperture, improves the coupling efficiency between the pumping light and the optical fiber, and can use a high-power multimode semiconductor laser as a pumping source, thereby achieving the purposes of improving the fiber-entering power of the pumping light and reducing the cost.
The structure formed by the invention realizes that pumping light is injected into a single end to obtain a bidirectional pumping effect, and achieves the purposes of inhibiting nonlinearity, reducing crosstalk and improving noise while saving pumping sources.
Claims (3)
1. A reflection-type discrete Raman fiber amplifier is composed of a pumping unit and a gain fiber and is characterized in that the amplifier comprises a pumping unit (1), an optical circulator (2), an optical coupler (3), a gain fiber (4) and an optical isolator (5); the output end of the pumping unit (1) is connected with the input end of the optical isolator (5), and the output end of the optical isolator (5) is connected with the input end of the optical coupler (3); the signal light input end (6) is connected with a first port (21) of the optical circulator (2), the signal light output end (7) is connected with a second port (22) of the optical circulator (2), and a third port (23) of the optical circulator (2) is connected with the input end of the optical coupler (3); the output end of the optical coupler (3) is connected with a gain optical fiber (4), the gain optical fiber (4) is a section of double-clad optical fiber, one end face of the double-clad optical fiber is plated with a metal film (4.1), the double-clad optical fiber is composed of a fiber core, an inner cladding and an outer cladding, the refractive index changes along the radial direction, the fiber core is larger than the inner cladding, and the inner cladding is larger than the outer cladding.
2. A reflection type discrete Raman fiber amplifier according to claim 1, characterized in that the pump unit (1) using the polarization coupling scheme is composed of semiconductor lasers (1.11 ~ 1.14), a first polarization coupler (1.3), a second polarization coupler (1.4), a combiner (1.5); the semiconductor lasers (1.11, 1.12) are vertically polarized semiconductor lasers with the same wavelength, and the output end of the semiconductor lasers is connected with the first polarization coupler (1.3); the semiconductor lasers (1.13, 1.14) are vertically polarized semiconductor lasers with the same wavelength, and the output end of the semiconductor lasers is connected with the second polarization coupler (1.4); the output ends of the first polarization coupler (1.3) and the second polarization coupler (1.4) are connected with a wave combiner (1.5), and the output end of the wave combiner (1.5) is connected with a pump light output end (1.6).
3. A reflection type discrete raman fiber amplifier according to claim 1, characterized in that the pumping unit (1) using the depolarizer scheme is composed of semiconductor lasers (1a, 1b), a combiner (1c), and a depolarizer (1d), the output ends of the semiconductor lasers (1a, 1b) are connected to the combiner (1c), the output end of the combiner (1c) is connected to the depolarizer (1d), and the output end of the depolarizer (1d) is connected to the pumping light output end (1 e).
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| CNA2004100413354A CN1595277A (en) | 2004-07-09 | 2004-07-09 | Reflection-type separated Raman fibre amplifier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100428041C (en) * | 2006-08-10 | 2008-10-22 | 浙江大学 | Method and device for multi-wavelength stable output of ring structure optical fiber laser |
| CN101915742A (en) * | 2010-08-10 | 2010-12-15 | 北京路源光科技有限公司 | Raman technology based biodiesel on-line detector |
| CN102201642A (en) * | 2011-04-20 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | Method for protecting pumping source of optical device |
| CN103645538A (en) * | 2013-12-16 | 2014-03-19 | 中国人民解放军国防科学技术大学 | Double-cladding-layer Raman fiber |
| CN105634606A (en) * | 2015-12-30 | 2016-06-01 | 桂林创研科技有限公司 | Signal regeneration converter |
-
2004
- 2004-07-09 CN CNA2004100413354A patent/CN1595277A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100428041C (en) * | 2006-08-10 | 2008-10-22 | 浙江大学 | Method and device for multi-wavelength stable output of ring structure optical fiber laser |
| CN101915742A (en) * | 2010-08-10 | 2010-12-15 | 北京路源光科技有限公司 | Raman technology based biodiesel on-line detector |
| CN101915742B (en) * | 2010-08-10 | 2012-06-27 | 北京路源光科技有限公司 | Raman technology based biodiesel on-line detector |
| CN102201642A (en) * | 2011-04-20 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | Method for protecting pumping source of optical device |
| CN103645538A (en) * | 2013-12-16 | 2014-03-19 | 中国人民解放军国防科学技术大学 | Double-cladding-layer Raman fiber |
| CN105634606A (en) * | 2015-12-30 | 2016-06-01 | 桂林创研科技有限公司 | Signal regeneration converter |
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