CN101420098B - Loop type laser for erbium doped optical fiber - Google Patents
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- CN101420098B CN101420098B CN2007101671357A CN200710167135A CN101420098B CN 101420098 B CN101420098 B CN 101420098B CN 2007101671357 A CN2007101671357 A CN 2007101671357A CN 200710167135 A CN200710167135 A CN 200710167135A CN 101420098 B CN101420098 B CN 101420098B
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Abstract
The invention relates to an Er-doped fiber loop laser comprising an er-doped fiber amplifier, a first optical coupler, a second optical coupler, a first optical loop, a second optical loop, a first polarization controller and a second polarization controller; wherein, the first optical loop is coupled with the er-doped fiber amplifier, the first optical coupler and the second optical coupler; the second optical loop is coupled with the first optical coupler and the second optical coupler; the er-doped fiber amplifier amplifies the first laser with specific wave length range; the first optical loop receives the first laser; the first optical loop and the second optical loop can respectively provide a first resonant cavity and a second resonant cavity; the first polarization controller and the second polarization controller can respectively control the polarization state of the first resonant cavity and the second resonant cavity; wherein, the first laser resonates in the first resonant cavity and in the second resonant cavity, and generates the second laser with the first wave length and the second wave length.
Description
Technical field
The present invention relates to a kind of loop type laser for erbium doped optical fiber, and particularly relate to a kind of loop type laser for erbium doped optical fiber that can launch the laser of a plurality of wavelength.
Background technology
Fibre Optical Communication Technology provides great bandwidth, and the user can be enjoyed fast and network service easily.Yet the cost of optical fiber communication element is comparatively expensive because of complex process or material, and makes Fibre Optical Communication Technology be used for backbone network more.At present, the division of labor mode of Fibre Optical Communication Technology has time division multiple access, wavelength division multiple access and code division multiple access etc., in order to allow Fibre Optical Communication Technology can reach the purpose of full duplex, uploads signal and most likely adopts two different wavelength with the following number of delivering a letter.
Therefore, in order to produce a plurality of different wavelength of laser, many research institutions and optical communication device manufacturer just develop and the various lasers that can send different wavelength of laser, all can network (Optical Metro Network) to be applied to light, light access network (Optical Access Network) and fiber sensing system (Optical Fiber Sensor System).
Please refer to U.S. US6,560, No. 247 patents, Chang et al. provides a kind of laser that is used to launch two kinds of different wave length laser.Yet this dual laser but needs the optical fiber Bragg grid of several short period property (Short Periodic), and (Fiber Bragg Grating FBG), forming the resonant cavity of two specific wavelengths by this, and obtains the laser of these two specific wavelengths.And accurate optical fiber Bragg grid needs good plated film (Coating) technology, and therefore, accurate optical fiber Bragg grid will increase the cost of this dual laser.
Please refer to U.S. US6,407, No. 855 patents, MacCormack et al. provides a kind of laser that can launch multiwavelength laser simultaneously.This multiple-wavelength laser is to use a plurality of resonance Raman devices (Cascaded Raman Resonator) of serial connection and the optical fiber Bragg grid of a plurality of precisions to reach the purpose of launching multiwavelength laser.The laser of this multi-wavelength is because use the resonance Raman device, and causes the nonlinear effect of whole laser can compare significantly, therefore needs the high power pumping laser of costliness.This multiple-wavelength laser needs accurate optical fiber Bragg grid and expensive high power pumping laser, therefore causes the manufacturing cost of this multiple-wavelength laser high.
In addition, please refer to Bamdad Bakhshi, and Peter A.Andrekson, " Dual-Wavelength 10-GHz Actively Mode-Locked Erbium Laser ", IEEEPhotonics Technol.Lett., Nov., 1999, vol.11, p.p.1387-1389 ", the dual laser that Bakhshiet al. provides needs two Raman pumpings (Raman Plump) laser, and this laser needs complicated mode lock-in circuit (Mode-Locking Circuit); therefore, its cost is still higher.
At last, please refer to " Xueming Liu; " A Dual-Wavelength Sampled Fiber BraggGrating and its Application in L-band Dual-wavelength Erbium-DopedFiber Lasers "; IEEE PHOTONICS TECHNOLOGY LETTERS; 18 (17-20): 2114-2116 SEP-OCT 2006 ", the dual laser that Xueming Liu is provided equally needs the optical fiber Bragg grid, and the mode of its pumping is to adopt the Raman pumping.Therefore, the laser of the dual wavelength that provided of Xueming Liu still has the problem of above-mentioned cost to exist.
Comprehensive the above, the optical filter that traditional multi-wavelength or dual laser need passive type is (for example: the optical fiber Bragg grid) in optical fiber circuit, and need the Raman pump laser to reach the purpose of emission dual wavelength and multiple-wavelength laser.Therefore, traditional multi-wavelength or dual laser are higher than cost.
The invention provides a kind of loop type laser for erbium doped optical fiber of tool Financial cost, this laser can have the output of dual wavelength or multi-wavelength, and need not utilize nonlinear effect (for example: raman amplifier) with use the passive type optical filter in optical fiber circuit.
Summary of the invention
The invention provides a kind of loop type laser for erbium doped optical fiber, this laser does not need to use the passive type optical filter or utilizes nonlinear effect, just can launch the laser of two or more wavelength.
The invention provides a kind of generation of Laser method, the laser of adopting said method can be launched the laser of two or more wavelength.
The invention provides a kind of loop type laser for erbium doped optical fiber, this loop type laser for erbium doped optical fiber comprises erbium-doped fiber amplifier (Erbium-Doped Fiber Amplifier, EDFA), first optical coupler (Optical Coupler, OCP), (Polarization Controller is PC) with second Polarization Controller for second optical coupler, first optical fiber circuit, second optical fiber circuit, first Polarization Controller.First optical fiber circuit is coupled to erbium-doped fiber amplifier, first and second optical coupler, and second optical fiber circuit is coupled to first and second optical coupler, and first Polarization Controller is coupled to first optical fiber circuit, and second Polarization Controller is coupled to second optical fiber circuit.Erbium-doped fiber amplifier is used to amplify first laser of particular range of wavelengths, first optical fiber circuit is used to receive first laser and first resonant cavity is provided, second optical fiber circuit is used to provide second resonant cavity, first Polarization Controller is used to control the polarization state of this first resonant cavity, and second Polarization Controller is used to control the polarization state of second resonant cavity.Wherein, first laser is at first and second resonant cavity internal resonance, and generation has second laser of first and second wavelength.
According to the described loop type laser for erbium doped optical fiber of embodiments of the invention, the first above-mentioned resonant cavity has the first free spectral range (Free Spectrum Range), second resonant cavity has the second free spectral range, the common multiple that pairing first and second frequency of first and second wavelength is first and second free spectral range.And the first above-mentioned optical fiber circuit has the ring-like filter of first optical fiber type, and second optical fiber circuit has the ring-like filter of second optical fiber type.
According to the described loop type laser for erbium doped optical fiber of embodiments of the invention, this loop type laser for erbium doped optical fiber more comprises the 3rd optical fiber circuit and the 3rd Polarization Controller.The 3rd optical fiber circuit is coupled to first and second optical coupler, and the 3rd Polarization Controller is coupled to the 3rd optical fiber circuit, and the 3rd optical fiber circuit is used to provide the 3rd resonant cavity, and the 3rd Polarization Controller is used to control the polarization state of the 3rd resonant cavity.Wherein, first laser first, second, with the 3rd resonant cavity internal resonance, and produce the 3rd laser with first, second and three-wavelength.The 3rd above-mentioned resonant cavity has the 3rd free spectral range, and first, second and three-wavelength pairing first, second and the 3rd frequency are the common multiples of first, second and the 3rd free spectral range.The 3rd above-mentioned optical fiber circuit has the ring-like filter of the 3rd optical fiber type.
The invention provides a kind of lasing method, the method may further comprise the steps: first laser that (a) amplifies particular range of wavelengths; (b) provide first resonant cavity with first free frequency spectrum and second resonant cavity with second free frequency spectrum, wherein, first and second resonant cavity has first and second optical fiber type loop filter; (c) polarization state of control first resonant cavity; (d) polarization state of control second resonant cavity; (e) produce second laser with first and second wavelength, wherein, the second generation of Laser mode is to utilize first laser to produce at first and second resonant cavity internal resonance.
According to the described lasing method of embodiments of the invention, the common multiple that pairing first and second frequency of first and second above-mentioned wavelength is first and second free spectral range.
According to the described lasing method of embodiments of the invention, this lasing method more may further comprise the steps: the 3rd resonant cavity with the 3rd free spectral range (f) is provided, and wherein, the 3rd resonant cavity has the 3rd optical fiber type loop filter; (g) polarization state of control the 3rd resonant cavity; (h) produce the 3rd laser with first, second and three-wavelength, wherein, the 3rd generation of Laser mode is to utilize first laser to produce at first, second and the 3rd resonant cavity internal resonance.And above-mentioned first, second and three-wavelength pairing first, second and the 3rd frequency are the common multiples of first, second and the 3rd free spectral range.
Er-doped fiber loop-type of the present invention mainly adopts optical fiber circuit and erbium-doped fiber amplifier to produce resonant cavity and amplifies resonance signal, to produce plural wavelength by this.By above-mentioned structure, the present invention does not need to use the passive type optical filter, therefore can reduce the cost of making.And loop type laser for erbium doped optical fiber of the present invention utilizes the multi-wavelength of raman amplifier or dual laser to need high-power pump laser unlike tradition, has therefore more reduced the cost of making.
For above and other objects of the present invention, feature and advantage can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is a kind of embodiment of loop type laser for erbium doped optical fiber provided by the present invention.
Fig. 2 is the spectrum diagram of signal.
Fig. 3 is second Wavelength of Laser and the power output schematic diagram that utilizes the loop type laser for erbium doped optical fiber 100 of Fig. 1 to be produced.
Fig. 4 is under loop type laser for erbium doped optical fiber 100 power that operates in different pump laser (28 to 110mW), first and second wavelength X
1, λ
2Relative power output and the schematic diagram of SMSR.
Fig. 5 is under 20 minutes observation time, first wavelength X
1Power output and the amount of variability of wavelength.
Fig. 6 is the another kind of embodiment of loop type laser for erbium doped optical fiber provided by the present invention.
Fig. 7 is the method flow diagram according to the laser of the shown generation multi-wavelength of embodiment.
The reference numeral explanation
10: loop type laser for erbium doped optical fiber
100: erbium-doped fiber amplifier
101: the first optical couplers
102: the second optical couplers
103: the first Polarization Controllers
104: the second Polarization Controllers
105: the three Polarization Controllers
1002: Er-doped fiber
1004: the wavelength division multiple access coupler
1006: pump laser
1008: optical isolator (Optical Isolator, OIS)
RING_1: first optical fiber circuit
RING_2: second optical fiber circuit
RING_3: the 3rd optical fiber circuit
S75～S78: steps flow chart.
Embodiment
The invention provides a kind of loop type laser for erbium doped optical fiber, this laser does not need to use the passive type optical filter or utilizes nonlinear effect, just can launch the laser of two or more wavelength.
The present invention utilizes erbium-doped fiber amplifier to form resonant cavity to produce two lasers more than the wavelength with utilizing optical fiber circuit, please refer to Fig. 1, and Fig. 1 is a kind of embodiment of loop type laser for erbium doped optical fiber provided by the present invention.This loop type laser for erbium doped optical fiber 10 comprises erbium-doped fiber amplifier 100, first optical coupler 101, second optical coupler 102, the first optical fiber circuit RING_1, the second optical fiber circuit RING_2, first Polarization Controller 103 and second Polarization Controller 104.Wherein, the first optical fiber circuit Ring_1 is coupled to erbium-doped fiber amplifier 100, first and second optical coupler 101,102, the second optical fiber circuit RING_2 is coupled to first and second optical coupler 101,102, first Polarization Controller 103 is coupled to the first optical fiber circuit RING_1, and second Polarization Controller 104 is coupled to the second optical fiber circuit RING_2.Erbium-doped fiber amplifier 100 is used to amplify first laser of particular range of wavelengths, the first optical fiber circuit RING_1 is used to receive first laser and first resonant cavity is provided, the second optical fiber circuit RING_2 is used to provide one second resonant cavity, first Polarization Controller 103 is used to control the polarization state of first resonant cavity, and second Polarization Controller 104 is used to control the polarization state of second resonant cavity.Wherein, first laser is at first and second resonant cavity internal resonance, and generation has second laser of first and second wavelength.
The free spectral range FSR=c/nL of the resonant cavity of optical fiber circuit, wherein, c is the light velocity, and n is the refractive index of optical fiber circuit, and L is the length of optical fiber circuit.According to above-mentioned formula, as long as the length of selected good first and second optical fiber circuit RING_1, RING_2 just can calculate the free spectral range FSR_1 of first resonant cavity and the free spectral range FSR_2 of second resonant cavity.When first laser during at first and second resonant cavity internal resonance, can resonate out has second laser of first and second wavelength.And first wavelength and second wavelength satisfy following condition: pairing first and second frequency of first and second wavelength is the common multiple of free spectral range FSR_1 and FSR_2.
Please continue with reference to Fig. 1, the length of supposing the first optical fiber circuit RING_1 is 22 meters, the length of the second optical fiber circuit RING_2 is 6 meters, the refractive index of first and second optical fiber circuit RING_1, RING_2 is 1.468, the free spectral range FSR_1=9.3MHz of first resonant cavity then, the free spectral range FSR_2=34.1MHz of second resonant cavity.Please refer to Fig. 2, Fig. 2 is the spectrum diagram of signal, and the difference that Fig. 2 shows first and second frequency of first and second wavelength correspondence is the least common multiple of free spectral range FSR_1 and FSR_2.As shown in Figure 2, the first frequency v of the first wavelength correspondence
1The second frequency v corresponding with second wavelength
2Difference DELTA v=102.3MHz=34.1*3 MHz=9.3*11MHz.Then, as long as have the ring-like filter of first optical fiber type and the second optical fiber circuit RING_2 has the ring-like filter of second optical fiber type, just can have second laser of first wavelength and second wavelength from optical coupler 101 taking-ups by the first optical fiber circuit RING_1.
Please continue with reference to Fig. 1, erbium-doped fiber amplifier 100 comprises Er-doped fiber (Erbium-DopedFiber) 1002, wavelength division multiple access coupler (Wavelength Division Multiplex Coupler, WCP) 1004, pump laser (Plumping Laser) 1006 and optical isolator (Optical Isolator, OIS) 1008.Wavelength division multiple access coupler 1004 is coupled to Er-doped fiber 1002, and pump laser 1006 is coupled to wavelength division multiple access coupler 1004, and optical isolator 1008 is coupled to wavelength division multiple access coupler 1004.By the effect of optical isolator 1008, will make first and second laser transmit according to counterclockwise direction.
Then please refer to Fig. 3, Fig. 3 is second Wavelength of Laser and the power output schematic diagram that utilizes the loop type laser for erbium doped optical fiber 100 of Fig. 1 to be produced.In this embodiment, the power of pump laser 1006 is 110 milliwatts (mW), the length of the first optical fiber circuit RING_1 is 22 meters, the length of the second optical fiber circuit RING_2 is 6 meters, the refractive index of first and second optical fiber circuit RING_1, RING_2 is 1.468, the free spectral range FSR_1=9.3MHz of first resonant cavity then, the free spectral range FSR_2=34.1MHz of second resonant cavity.As shown in Figure 3, have the ring-like filter of first optical fiber type and the second optical fiber circuit RING_2 has the ring-like filter of second optical fiber type, just can take out laser from optical coupler 101 with first wavelength and second wavelength by the first optical fiber circuit RING_1.Wherein, first wavelength X
1Be 1560.17 nanometers, second wavelength X
2Be 1561.93 nanometers.First wavelength X
1With second wavelength X
2Output modalities separation delta λ=1.76 nanometers, and first wavelength X
1With second wavelength X
2Septate mode constrain than (Side-Mode Suppression Ratio SMSR) can be greater than 45.3dB.Yet, the first above-mentioned wavelength X
1With second wavelength X
2The length of wavelength of length, refractive index, pump laser of length, RING_1 and RIN_2 and the numerical value such as free frequency spectrum of first and second resonant cavity only be a kind of embodiment provided by the present invention; be not to be used to limit the present invention; all spiritual persons according to the invention are when in the scope that the present invention protected.In other words, the designer can produce the free frequency spectrum of first and second different resonant cavities to produce the first different wavelength X by the length of the wavelength of adjusting the length of RING_1 with RIN_2, refractive index, pump laser
1Length with second wavelength X 2.
Then please refer to Fig. 4, Fig. 4 is under loop type laser for erbium doped optical fiber 100 power that operates in different pump laser (28 to 110mW), first and second wavelength X
1, λ
2Relative power output and the schematic diagram of SMSR.When the power of pump laser is lower than 28mW, will not observe wavelength output.When the power operation of 980nm pump laser 28 between 110mW the time, first wavelength X
1Power output and SMSR then be distributed in respectively-19.5dBm to-8.1dBm and 33dB between the 45dB, second wavelength X
1Power output and SMSR then be distributed in respectively-27.8dBm to-7.1dBm and 32dB between the 42dB.And minimum and maximum power output to change power in pump laser be that divide between 28mW and the 110mW in addition not Wei 8.3dB and 1dB.
Then please refer to Fig. 5, Fig. 5 is under 20 minutes observation time, first wavelength X
1Power output and the amount of variability of wavelength.As shown in the figure, first wavelength X
1Variable quantity and the variation of power output in 20 minutes observation time then respectively less than 0.11nm and 0.5dB.
According to Fig. 3～5, loop type laser for erbium doped optical fiber 100 provided by the present invention can be launched the laser with dual wavelength, and the dual wavelength of its output is stable (wavelength variable quantity is very little) very, and the variable quantity of its power output is also very little, and its SMSR is at least greater than 30dB.
Then, please refer to Fig. 6, Fig. 6 is the another kind of embodiment of loop type laser for erbium doped optical fiber provided by the present invention.It is similar that mixing among this loop type laser for erbium doped optical fiber 60 and Fig. 1 joined erbium optical fiber circuit formula laser 10, only had more the 3rd optical fiber circuit RING_3 and the 3rd Polarization Controller 105.The 3rd optical fiber circuit RING_3 is coupled to first and second optical coupler 101,102, the three Polarization Controllers 105 and is coupled to the 3rd optical fiber circuit RING_3.The 3rd optical fiber circuit RING_3 is used to provide the 3rd resonant cavity, and the 3rd Polarization Controller 105 is used to control the polarization state of the 3rd resonant cavity.Wherein, first laser first, second, with the 3rd resonant cavity internal resonance, and produce the 3rd laser with first, second and three-wavelength.
As aforementioned, can calculate free spectral range FSR1, FSR2 and the FSR3 of first, second and the 3rd resonant cavity, wherein, pairing first, second and the 3rd frequency of first, second and three-wavelength can be the common multiple of free spectral range FSR1～FSR3.Then, as long as by the first optical fiber circuit RING_1 have the ring-like filter of first optical fiber type, the second optical fiber circuit RING_2 has the ring-like filter of second optical fiber type and the 3rd optical fiber circuit RING_3 has the ring-like filter of the 3rd optical fiber type, just can have the 3rd laser of first, second and three-wavelength from optical coupler 101 taking-ups.
Please refer to Fig. 7, Fig. 7 is the method flow diagram according to the laser of the shown generation multi-wavelength of embodiment.The method comprises following flow process: the laser that (S75) amplifies particular range of wavelengths; (S76) provide a plurality of resonant cavities; (S77) control polarization state; (S78) laser of generation multi-wavelength.
According to the loop type laser for erbium doped optical fiber 10 of Fig. 1, process step (S75) is to utilize erbium-doped fiber amplifier to amplify first laser of particular range of wavelengths; Process step (S76) is first resonant cavity and second resonant cavity with second free frequency spectrum that utilizes first and second optical fiber circuit to provide to have the first free frequency spectrum, wherein, formed first and second resonant cavity of first and second optical fiber circuit has first and second optical fiber type loop filter; Process step (S77) then is to utilize first and second Polarization Controller to control the polarization state of first and second resonant cavity; Process step (S78) then is to utilize first laser to produce second laser with first and second wavelength in first and second resonant cavity internal resonance.In addition, as noted earlier, the common multiple that pairing first and second frequency of first and second wavelength must be first and second free spectral range.
According to the loop type laser for erbium doped optical fiber 60 of Fig. 6, process step (S75) is to utilize erbium-doped fiber amplifier to amplify first laser of particular range of wavelengths; Process step (S76) is first resonant cavity, second resonant cavity with second free frequency spectrum and the 3rd resonant cavity with the 3rd free frequency spectrum that utilizes first, second and the 3rd optical fiber circuit to provide to have the first free frequency spectrum, wherein, formed first, second and the 3rd resonant cavity of first, second and the 3rd optical fiber circuit has first, second and the 3rd optical fiber type loop filter; Process step (S77) then is to utilize first, second and the 3rd Polarization Controller to control the polarization state of first, second and the 3rd resonant cavity; Process step (S78) then is to utilize first laser to produce the 3rd laser with first, second and three-wavelength in first, second and the 3rd resonant cavity internal resonance.And as noted earlier, first, second and three-wavelength pairing first, second and the 3rd frequency must be the common multiples of first, second and the 3rd free spectral range.
In sum, Er-doped fiber loop-type of the present invention mainly adopts optical fiber circuit and erbium-doped fiber amplifier to produce resonant cavity and amplifies resonance signal, to produce plural wavelength by this.By means of above-mentioned structure, the present invention does not need to use the passive type optical filter, therefore can reduce the cost of making.And loop type laser for erbium doped optical fiber of the present invention utilizes the multi-wavelength of raman amplifier or dual laser to need high-power pump laser unlike tradition, has therefore more reduced the cost of making.
Though the present invention discloses as above with embodiment; right its be not to be used to limit the present invention, anyly have the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.
Claims (16)
1. loop type laser for erbium doped optical fiber comprises:
One erbium-doped fiber amplifier is used to amplify one first laser of a particular range of wavelengths;
One first optical coupler;
One second optical coupler;
One first optical fiber circuit is coupled to this erbium-doped fiber amplifier, this first and second optical coupler, is used to receive this first laser, and one first resonant cavity is provided;
One second optical fiber circuit is coupled to this first and second optical coupler, is used to provide one second resonant cavity;
One first Polarization Controller is coupled to this first optical fiber circuit, is used to control the polarization state of this first resonant cavity;
One second Polarization Controller is coupled to this second optical fiber circuit, is used to control the polarization state of this second resonant cavity;
Wherein, this first laser is at this first and second resonant cavity internal resonance, and generation has one second laser of one first wavelength and second wavelength simultaneously.
2. loop type laser for erbium doped optical fiber as claimed in claim 1, wherein, this first resonant cavity has one first free spectral range, this second resonant cavity has one second free spectral range, and this first wavelength and the pairing first frequency of this second wavelength and a second frequency are the common multiples of this first free spectral range and this second free spectral range.
3. loop type laser for erbium doped optical fiber as claimed in claim 2, wherein, the difference of this first frequency and this second frequency is the least common multiple of this first free spectral range and this second free spectral range.
4. loop type laser for erbium doped optical fiber as claimed in claim 2, wherein, this first optical fiber circuit has the ring-like filter of one first optical fiber type, and this second optical fiber circuit has the ring-like filter of one second optical fiber type.
5. loop type laser for erbium doped optical fiber as claimed in claim 4, wherein, this erbium-doped fiber amplifier comprises:
One Er-doped fiber;
One wavelength division multiple access coupler is coupled to this Er-doped fiber;
One pump laser is coupled to this wavelength division multiple access coupler; And
One optical isolator is coupled to this wavelength division multiple access coupler.
6. loop type laser for erbium doped optical fiber as claimed in claim 5, wherein, this first laser and this second laser are according to a specific direction transmission.
7. loop type laser for erbium doped optical fiber as claimed in claim 1, wherein, this loop type laser for erbium doped optical fiber more comprises:
One the 3rd optical fiber circuit is coupled to this first optical coupler and this second optical coupler, is used to provide one the 3rd resonant cavity;
One the 3rd Polarization Controller is coupled to the 3rd optical fiber circuit, is used to control the polarization state of the 3rd resonant cavity;
Wherein, this first laser this first resonant cavity, this second resonant cavity, with the 3rd resonant cavity internal resonance, and produce one the 3rd laser with this first wavelength, this second wavelength and a three-wavelength.
8. loop type laser for erbium doped optical fiber as claimed in claim 7, wherein, this first resonant cavity has one first free spectral range, and this second resonant cavity has one second free spectral range, and the 3rd resonant cavity has one the 3rd free spectral range; This first wavelength, this second wavelength and the pairing first frequency of this three-wavelength, a second frequency and one the 3rd frequency are the common multiples of this first free spectral range, this second free spectral range and the 3rd free spectral range.
9. loop type laser for erbium doped optical fiber as claimed in claim 8, wherein, this first optical fiber circuit has the ring-like filter of one first optical fiber type, and this second optical fiber circuit has the ring-like filter of one second optical fiber type, and the 3rd optical fiber circuit has the ring-like filter of one the 3rd optical fiber type.
10. lasing method comprises:
Amplify one first laser of a particular range of wavelengths;
One first resonant cavity with one first free frequency spectrum and one second resonant cavity with one second free frequency spectrum are provided, and wherein, this first resonant cavity and this second resonant cavity have one first optical fiber type loop filter and one second optical fiber type loop filter respectively;
Control the polarization state of this first resonant cavity;
Control the polarization state of this second resonant cavity; And
Generation has one second laser of one first wavelength and one second wavelength, and wherein, this second generation of Laser mode is to utilize this first laser to produce at this first resonant cavity and this second resonant cavity internal resonance.
11. lasing method as claimed in claim 10, wherein, this first wavelength and the pairing first frequency of this second wavelength and a second frequency are the common multiples of this first free spectral range and this second free spectral range.
12. lasing method as claimed in claim 11, wherein, the difference of this first frequency and this second frequency is the least common multiple of this first free spectral range and this second free spectral range.
13. lasing method as claimed in claim 10, wherein, this lasing method more comprises:
One the 3rd resonant cavity with one the 3rd free spectral range is provided, and wherein, the 3rd resonant cavity has one the 3rd optical fiber type loop filter;
Control the polarization state of the 3rd resonant cavity;
Generation has one the 3rd laser of this first wavelength, this second wavelength and a three-wavelength, and wherein, the 3rd generation of Laser mode is to utilize this first laser to produce at this first resonant cavity, this second resonant cavity and the 3rd resonant cavity internal resonance.
14. lasing method as claimed in claim 13, wherein, this first wavelength, this second wavelength and the pairing first frequency of this three-wavelength, a second frequency and one the 3rd frequency are the common multiples of this first free spectral range, this second free spectral range and the 3rd free spectral range.
15. lasing method as claimed in claim 10, wherein, this first laser that amplifies this particular range of wavelengths is to utilize an erbium-doped fiber amplifier.
16. lasing method as claimed in claim 13, wherein, it is to utilize one first optical fiber circuit, one second optical fiber circuit and one the 3rd optical fiber circuit to provide that this first resonant cavity, this second resonant cavity and the 3rd resonant cavity are provided.
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