CN200983464Y - A multi-wave length optical fiber laser with loop structure - Google Patents
A multi-wave length optical fiber laser with loop structure Download PDFInfo
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- CN200983464Y CN200983464Y CN 200620106572 CN200620106572U CN200983464Y CN 200983464 Y CN200983464 Y CN 200983464Y CN 200620106572 CN200620106572 CN 200620106572 CN 200620106572 U CN200620106572 U CN 200620106572U CN 200983464 Y CN200983464 Y CN 200983464Y
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- amplifier
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Abstract
The utility model relates to an annular structure multi-wave length laser. The utility model comprises a light annular implement formed by cascading annular return circuit via optical fiber, a light coupler, a fiber-optical Raman amplifier and an erbium-doped fiber amplifier. Second port of the light annular implement is connected with Sangac annular filter, which comprises two polarization control devices cascading with both ends of high birefringence optical fiber via optical fiber. The other ends of two polarization control devices are connected with synthetic port of 3dB optical coupler respectively. Amalgamate application of the fiber-optical Raman amplifier and the erbium-doped fiber amplifier of the utility model restrains the wave length competition S of the erbium-doped fiber amplifier, and accomplishes stabilizing output of multi-wave length laser.
Description
Technical field
The utility model belongs to the fiber laser field, particularly a kind of ring type structure multi-wavelength optical fiber laser based on fiber Raman amplifier erbium-doped fiber amplifier 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 power output 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 utility model has proposed a kind of ring type structure multi-wavelength optical fiber laser based on fiber Raman amplifier erbium-doped fiber amplifier hybrid gain at the deficiencies in the prior art.
The utility model comprises optical circulator, optical coupler, fiber Raman amplifier and the erbium-doped fiber amplifier that is connected into loop checking installation by optical fiber, and wherein an end of the little proportion by subtraction of optical coupler is as the laser output mouth.Second port of optical circulator is connected with the Sagnac loop filter; 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 optical coupler respectively.
The described loop checking installation that is connected into is an end that fiber Raman amplifier is connected erbium-doped fiber amplifier, the other end of erbium-doped fiber amplifier connects the 3rd port of optical circulator, first port of optical circulator connects optical coupling, and the other end of device optical coupler connects fiber Raman amplifier.
The described loop checking installation that is connected into is an end that erbium-doped fiber amplifier is connected fiber Raman amplifier, the other end of fiber Raman amplifier connects the 3rd port of optical circulator, first port of optical circulator connects optical coupling, and the other end of device optical coupler connects erbium-doped fiber amplifier.
Described optical circulator comprises three ports, and wherein two ports are connected with 3dB optical coupler in the Sagnac loop filter with optical coupler respectively.Enter as optical signals first port, then export by second port; Enter as optical signals second port, then export by the 3rd port.
The utility model mainly is applicable in optical communication, light sensing.The utility model has adopted the hybrid gain of fiber Raman amplifier and erbium-doped fiber amplifier, 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 is used and has been suppressed the wavelength Competition Characteristics of erbium-doped fiber amplifier, thereby has realized the stable output of fiber laser multi-wavelength.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the present utility model;
Fig. 2 is the structural representation of another embodiment of the present utility model;
Fig. 3 is the laser output spectrum figure of the utility model one embodiment;
Fig. 4 is the laser output multiple scanning spectrogram of the utility model one embodiment.
Embodiment
Selecting gain ranging for use is fiber Raman amplifier 1 and the erbium-doped fiber amplifier 2 of 1560nm to 1570nm; The selection work scope is optical circulator 3 and the optical coupler 9 of 1530nm to 1580nm, and an end of the little proportion by subtraction of optical coupler (2%) is as the laser output mouth.Sagnac loop filter 8 comprises by optical fiber and is connected on the Polarization Controller 5 at hi bi birefringence fiber 6 two ends and the other end of 7, two Polarization Controllers of another Polarization Controller is connected with the port in the same way of 3dB optical coupler 4 respectively.Hi bi birefringence fiber 6 length are 15.2m, and birefringence 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 Raman amplifier 1 connects an end of erbium-doped fiber amplifier 2, the other end of erbium-doped fiber amplifier 2 connects the 3rd port of optical circulator 3, second port of optical circulator 3 connects Sagnac loop filter 8, first port of optical circulator 3 connects optical coupler 9, and the other end of device optical coupler connects fiber Raman amplifier 1.
As shown in Figure 2, adopt second kind of structure, erbium-doped fiber amplifier 2 connects an end of fiber Raman amplifier 1, the other end of fiber Raman amplifier 1 connects the 3rd port of optical circulator 3, second port of optical circulator 3 connects Sagnac loop filter 8, first port of optical circulator 3 connects optical coupler 9, and the other end of device optical coupler 9 connects erbium-doped fiber amplifier 2.
Open fiber Raman amplifier 1 and erbium-doped fiber amplifier 2, regulate a Polarization Controller 5 and another Polarization Controller 7 in the Sagnac loop filter 8, we obtain 8 Wavelength stabilized outputs multi-wavelength optical fiber laser output spectra as shown in Figure 3, the output of multi-wavelength optical fiber laser is stable, the laser output jitter has been realized the stable output of fiber laser multi-wavelength less than 0.2dB in 15 minutes continuous sweep as shown in Figure 4.
Claims (4)
1, a kind of ring type structure multi-wavelength optical fiber laser, it is characterized in that this fiber laser comprises optical circulator, optical coupler, fiber Raman amplifier and the erbium-doped fiber amplifier that is connected into loop checking installation by optical fiber, wherein an end of the little proportion by subtraction of optical coupler is as the laser output mouth; Second port of optical circulator is connected with the Sagnac loop filter, 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 optical coupler respectively.
2, a kind of ring type structure multi-wavelength optical fiber laser as claimed in claim 1 is characterized in that described optical circulator comprises three ports, and wherein two ports are connected with 3dB optical coupler in the Sagnac loop filter with optical coupler respectively.
3, a kind of ring type structure multi-wavelength optical fiber laser as claimed in claim 1, it is characterized in that the described loop checking installation that is connected into is an end that fiber Raman amplifier is connected erbium-doped fiber amplifier, the other end of erbium-doped fiber amplifier connects the 3rd port of optical circulator, first port of optical circulator connects optical coupling, and the other end of device optical coupler connects fiber Raman amplifier.
4, a kind of ring type structure multi-wavelength optical fiber laser as claimed in claim 1, it is characterized in that the described loop checking installation that is connected into is an end that erbium-doped fiber amplifier is connected fiber Raman amplifier, the other end of fiber Raman amplifier connects the 3rd port of optical circulator, first port of optical circulator connects optical coupling, and the other end of device optical coupler connects erbium-doped fiber amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620106572 CN200983464Y (en) | 2006-08-10 | 2006-08-10 | A multi-wave length optical fiber laser with loop structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620106572 CN200983464Y (en) | 2006-08-10 | 2006-08-10 | A multi-wave length optical fiber laser with loop structure |
Publications (1)
| Publication Number | Publication Date |
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| CN200983464Y true CN200983464Y (en) | 2007-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200620106572 Expired - Fee Related CN200983464Y (en) | 2006-08-10 | 2006-08-10 | A multi-wave length optical fiber laser with loop structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340093A (en) * | 2010-07-27 | 2012-02-01 | 清华大学 | Optical fiber mode locked laser |
-
2006
- 2006-08-10 CN CN 200620106572 patent/CN200983464Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340093A (en) * | 2010-07-27 | 2012-02-01 | 清华大学 | Optical fiber mode locked laser |
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Legal Events
| 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 |