CN2595023Y - Two stage serier connected optical fiber Raman laser for 1310 nano wavelength - Google Patents
Two stage serier connected optical fiber Raman laser for 1310 nano wavelength Download PDFInfo
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- CN2595023Y CN2595023Y CN 02279914 CN02279914U CN2595023Y CN 2595023 Y CN2595023 Y CN 2595023Y CN 02279914 CN02279914 CN 02279914 CN 02279914 U CN02279914 U CN 02279914U CN 2595023 Y CN2595023 Y CN 2595023Y
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Abstract
The utility model relates to a two-stage series connected optical fiber Raman laser used for 1550 nm wave band, which is composed of a pump light source, an optical fiber loop mirror assembly, a fiber coupler, a small core diameter single mode fiber assembly with germanium as a Raman gain medium. The output wavelength of the pump light source is 1300-1320 nm, an optical resonator is composed of the optical fiber loop mirrors. The utility model has the advantages of simple structure, low cost and high performance.
Description
Technical field
The utility model belongs to the optical fiber communication technology field, is specifically related to a kind of two-stage tandem fibre optic Raman laser of forming with the optical fiber circuit speculum that is used for 1310 nano wavebands.
Background technology
Continuous progress along with society, science and technology development, people are to the demand of message transmission, with the speed increment of index, especially in recent years, because computer communication, the fast development of transfer of data, only Internet (Internet) and regional network (Intranet), data transmission rate is annual to increase by 50%, expect the end of this century and rate of information transmission requirement the beginning of next century reaches Petabit/s, this needs the communication bandwidth of 200-400nm to support.Therefore the transfer rate of existing fiber communication system can not satisfy this demand far away.With erbium-doped fiber amplifier (EDFA) and wavelength division multiplexing (WDM) technology is the communication system of representative, for present computer network, optical cable television (CATV), communication network required information in zone still can satisfy, but in the face of the information requirement of expanding day by day and long distance, at a high speed, big volume transport, erbium-doped fiber amplifier also faces new difficulty, at first must enlarge existing transmission bandwidth, adopt broadband high density wavelength division multiplexing (DWDM) technology, this has brought difficulty for the production of components and parts.Spread bandwidth is a valid approach.And the effective bandwidth of present commercial erbium-doped fiber amplifier is 35nm (4TZH), though experimentally, carries out can being increased to about 70nm behind the gain-smoothing with long period fiber grating, and this does not also satisfy the bandwidth of actual needs.Another difficulty is the restriction that gain of EDFA is subjected to used pumping semiconductor laser power, and this makes long distance, and remote control pumping (remote pumping) system is restricted.Although can improve pump power by many pumping sources multiplex technique in principle, this has brought the complexity of system undoubtedly and has been difficult to realize.The Raman light amplification of optical fiber just has been found and constantly has been studied as far back as the mid-80, but fails practicality owing to there is not easy and enough high-power pumping source always.The Raman light gain amplifier of optical fiber derives from the nonlinear optical effect of Transmission Fibers itself, when the light of certain power transmits, follow stimulated Raman scattering, because the length long enough of optical fiber in optical fiber, the stokes light that is produced constantly amplifies, and promptly forms Raman gain.The Raman shift of common silica fiber is 460cm-1, the about 20TZH of gain bandwidth, and the Raman shift of mixing the phosphorus silica fiber can reach 1300cm-1, the Raman small signal gain of optical fiber can reach 40dB, and select suitable pump power, can avoid Rayleigh scattering and stimulated Brillouin scattering, reach the signal to noise ratio that is better than EDFA.The another one advantage is to need not to insert in system amplification medium, directly utilizes Transmission Fibers, can realize the broadband amplification in this low loss window of 1300-1600nm.This is especially suitable to the remote control pumping in long distance and the submarine fiber cable communication system.Simultaneously in conjunction with WDM technology, can be easy, the optical communication system of a large amount of 1300nm of having laid is realized the bandwidth expansion of upgrade expanding and 1500nm optical communication system effectively.This has very tempting prospect and huge economic for realizing following wideband transmit and the upgrading of existing system.The key technology that realizes fiber Raman amplifier practicability is a pump light source.Though semiconductor laser is optimal pump light source, because the restriction of its power output and wavelength, needs are compound with a plurality of devices, can only be used for 1.55 microns windows.The power output of tandem fibre optic Raman laser can reach greater than 2 watts, and the output wavelength scope can cover two optical fiber communication windows.Usually the cascaded optical fiber Raman laser adopts fiber grating as speculum, need scribe different fiber gratings to different wavelength, cost height, complex manufacturing technology.
Summary of the invention
The purpose of this utility model is to design a kind of simple in structure, and is with low cost, well behaved novel optical fiber Raman laser.
The fibre optic Raman laser of the utility model design, its resonant cavity adopts the optical fiber circuit speculum, be operated in 1310 nano wavebands, specifically by pump light source, optical fiber circuit arrangement of mirrors, fiber coupler, mix the germanium monomode fiber as the little core diameter of raman gain medium and constitute, its structure is as shown in Figure 1.Wherein, pump light source 1 is connected with the optical fiber circuit arrangement of mirrors through fiber coupler 2, the optical fiber circuit arrangement of mirrors is connected to form successively by optical fiber circuit speculum 3,4,5,6, and be designed to the two-stage tandem form, monomode fiber 7 is connected between optical fiber circuit speculum 4 and 5, optical fiber circuit speculum 6 connects laser output optical fibre connector 8, and fiber coupler 2 connects pumping light power monitoring fiber connector 9, constitutes the two-stage tandem fibre optic Raman laser.
In the utility model, pump laser 1 adopts the semiconductor solid state laser of ytterbium-doped double-cladded-layer optical fiber laser or optical fiber coupling output, and its output wavelength is the 1115-1125 nanometer.Fiber coupler 2 is the fiber couplers about 9.5: 1, and 5% of pump light is used as power monitoring.The high transmission of 3 couples of pump light 1115-1125 of optical fiber circuit mirror nanometer is high reflection to second level Stokes Raman shift 1230-1250 nanometer; 4 pairs of first order Stokes of optical fiber circuit mirror Raman shift 1170-1190 nanometer is high reflection, and is high transmission to pump light 1115-1125 nanometer and second level Stokes Raman shift 1230-1250 nanometer; 5 pairs of first order Stokes of optical fiber circuit mirror Raman shift 1170-1190 nanometer is high reflection, and is high transmission to pump light 1115-1125 nanometer and second level Stokes Raman shift 1230-1250 nanometer; The high reflection of 6 couples of pump light 1115-1125 of optical fiber circuit mirror nanometer, and to the transmission of second level Stokes Raman shift part, transmissivity is 15-20%.Form optical resonator by these optical fiber circuit mirrors.Little core diameter is mixed the Raman shift of germanium monomode fiber (7) at 460CM
-1About, length is the 1-2 kilometer, as raman gain medium.
The operation principle of the fibre optic Raman laser of the utility model design is as follows: pump light sees through optical fiber circuit mirror 3 and the little core diameter of 4 back pumpings is mixed germanium monomode fiber 7, the gain of the first order Stokes Raman shift 1170-1190 nanometer that produces, remaining pump light is by 6 reflections of optical fiber circuit mirror, the little core diameter of pumping is mixed germanium monomode fiber 7 once more, has improved first order Stokes Raman shift gain conversions efficient.Because optical fiber circuit mirror 4 and 5 all is high reflection to it, the laser that produces can't be exported, and all is used for pumping and produces second level Stokes Raman shift gain again.Same principle, because the resonant cavity of optical fiber circuit mirror 3 and 6 second level Stokes Raman shifts of forming, optical fiber circuit mirror 6 is the part transmission to it, therefore the laser of second level Stokes Raman shift generation is by its coupling output, wavelength is about the 1230-1250 nanometer, is used for pumping 1310 nano waveband fiber Raman amplifiers.
The fibre optic Raman laser of the utility model design is simple in structure, with low cost, functional.
Description of drawings
Fig. 1 is a structural diagrams of the present utility model.
Fig. 2 is an optical fiber back reflective mirror structural diagrams.
Fig. 3 is the utility model profile diagram.
Number in the figure: 1 is pump light source; 2 is fiber coupler; 3,4,5,6 is the optical fiber circuit speculum; 7 mix the germanium monomode fiber for little core diameter, and 8 are the output laser connector, and 9 is pump light monitoring fiber connector; 10 is loopback fiber; 11 is protective casing, and 12 is pump light monitoring fiber interface, and 13 are output laser fiber interface.
Embodiment
According to shown in Figure 1, this fibre optic Raman laser is by pump light source 1, and fiber coupler 2, optical fiber circuit arrangement of mirrors 3,4,5,6, little core diameter are mixed germanium monomode fiber 7 and formed.Pump light former 1 adopts ytterbium-doped double-cladded-layer optical fiber laser, and its output wavelength is the 1115-1125 nanometer.Fiber coupler 2 is 9.5: 1, and 5% of pump light is used as power monitoring.The structure of optical fiber circuit speculum 3,4,5,6 as shown in Figure 2, the wavelength requirement according to required is formed by the monomode fiber fused biconical taper, middle fixing by protective casing 11, the reflection of speculum or transmission require as previously mentioned.Above-mentioned device by shown in Figure 1, is connected with optical fiber splicer, and the loss control of each tie point has enough low insertion loss to guarantee laser below the 0.02-0.05 decibel, can bear high-power load simultaneously.At last all devices are fixed on the metallic plate, the cabinet of packing into, respectively with pump light monitoring fiber connector 9, output laser connector 8 is connected with 13 with the corresponding interface 12 on the cabinet, promptly gets the two-stage tandem fibre optic Raman laser that is used for 1310 nano wavebands.
Claims (8)
1, a kind of two-stage tandem fibre optic Raman laser that is used for 1310 nano wavebands, it is characterized in that resonant cavity adopts the optical fiber circuit speculum, be operated in 1310 nano wavebands, specifically by pump light source, the optical fiber circuit arrangement of mirrors, fiber coupler, mixing the germanium monomode fiber as the little core diameter of raman gain medium constitutes, wherein, pump light source (1) is connected with the optical fiber circuit arrangement of mirrors through fiber coupler (2), the optical fiber circuit arrangement of mirrors is by optical fiber circuit speculum (3), (4), (5), (6) connect to form successively, and be designed to the two-stage tandem form, monomode fiber (7) is connected between optical fiber circuit speculum (4) and (5), optical fiber circuit speculum (6) connects laser output optical fibre connector (8), fiber coupler (2) connects pumping light power monitoring fiber connector (9), constitutes the two-stage tandem fibre optic Raman laser.
2, fibre optic Raman laser according to claim 1 is characterized in that pump light source (1) is the semiconductor solid state laser of output wavelength ytterbium-doped double-cladded-layer optical fiber laser that is the 1115-1125 nanometer or optical fiber coupling output.
3, fibre optic Raman laser according to claim 1 is characterized in that fiber coupler (2) is 9.5: 1 a fiber coupler, and 5% of pump light is used as power monitoring.
4, fibre optic Raman laser according to claim 1 is characterized in that optical fiber circuit mirror (3) to the high transmission of pump light 1115-1125 nanometer, is high reflection to second level Stokes Raman shift 1230-1250 nanometer.
5, fibre optic Raman laser according to claim 1, it is characterized in that optical fiber circuit mirror (4) is high reflection to first order Stokes Raman shift 1170-1190 nanometer, and to pump light 1115-1125 nanometer and second level Stokes Raman shift, the 1230-1250 nanometer is high transmission.
6, fibre optic Raman laser according to claim 1, it is characterized in that optical fiber circuit mirror (5) is high reflection to first order Stokes Raman shift 1170-1190 nanometer, and be high transmission pump light 1115-1125 nanometer and second level Stokes Raman shift 1230-1250 nanometer.
7, fibre optic Raman laser according to claim 1 it is characterized in that optical fiber circuit mirror (6) to the high reflection of pump light 1115-1125 nanometer, and to the transmission of second level Stokes Raman shift part, transmissivity is 15-20%.
8, fibre optic Raman laser according to claim 1 is characterized in that little core diameter mixes the Raman shift of germanium monomode fiber (7) at 460CM
-1, length is the 1-2 kilometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02279914 CN2595023Y (en) | 2002-11-26 | 2002-11-26 | Two stage serier connected optical fiber Raman laser for 1310 nano wavelength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02279914 CN2595023Y (en) | 2002-11-26 | 2002-11-26 | Two stage serier connected optical fiber Raman laser for 1310 nano wavelength |
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| Publication Number | Publication Date |
|---|---|
| CN2595023Y true CN2595023Y (en) | 2003-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02279914 Expired - Fee Related CN2595023Y (en) | 2002-11-26 | 2002-11-26 | Two stage serier connected optical fiber Raman laser for 1310 nano wavelength |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124044A (en) * | 2013-01-30 | 2013-05-29 | 中国人民解放军国防科学技术大学 | Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser |
-
2002
- 2002-11-26 CN CN 02279914 patent/CN2595023Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124044A (en) * | 2013-01-30 | 2013-05-29 | 中国人民解放军国防科学技术大学 | Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser |
| CN103124044B (en) * | 2013-01-30 | 2015-04-08 | 中国人民解放军国防科学技术大学 | Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |