CN110635342A - Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable - Google Patents

Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable Download PDF

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Publication number
CN110635342A
CN110635342A CN201911021300.7A CN201911021300A CN110635342A CN 110635342 A CN110635342 A CN 110635342A CN 201911021300 A CN201911021300 A CN 201911021300A CN 110635342 A CN110635342 A CN 110635342A
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Prior art keywords
fiber
wavelength
polarization
port
maintaining
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CN201911021300.7A
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Chinese (zh)
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赵琦
裴丽
宁提纲
郑晶晶
解宇恒
李晶
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06712—Polarising fibre; Polariser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06716—Fibre compositions or doping with active elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10061—Polarization control

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

A tunable multi-wavelength fiber laser with variable all-fiber wavelength intervals belongs to the field of fiber communication and instruments and meters, and can simultaneously realize tuning of a wavelength range and change of wavelength intervals. In the optical fiber laser, a first polarization controller, a first polarization-maintaining optical fiber, a second polarization controller and a second polarization-maintaining optical fiber are connected between a sixth port and a seventh port to form a double-order Sagnac optical fiber filter. And the port nine is connected with the polarization controller in three phases, and the port of the polarization controller in three phases is connected with the polarization maintaining fiber in three phases to form the Lyot filter. And the third polarization controller is adjusted to realize the tuning of the wavelength range, and the first polarization controller and the second polarization controller are adjusted to realize the change of the wavelength interval. The high-nonlinearity optical fiber can form a four-wave mixing effect, inhibit wavelength competition and realize the change of the number of wavelengths. The laser has flexible output wavelength and is favorable for application in an optical wavelength division multiplexing system.

Description

Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable
Technical Field
The invention relates to a tunable multi-wavelength fiber laser with variable all-fiber wavelength intervals, belonging to the field of fiber communication, instruments and meters.
Background
Since the 21 st century, the human society has changed from the world to the earth, the scientific field has developed rapidly, and people's lives are changing day by day. The coming of the information era greatly increases the requirements of people on communication speed and communication capacity, and optical fiber communication is in force and plays an important role. At present, 100G optical fiber transmission networks have been commercialized, and as the amount of network data exponentially increases, the related technologies of 400G optical fiber transmission networks are mature day by day, and standardization work is steadily advancing. In optical networks, wavelength division multiplexing is a commonly used technique that uses a plurality of channels of different wavelengths to transmit information. Typically, generating multiple wavelengths requires multiple laser sources, which can add significant cost to the system if a single wavelength laser is utilized. The multi-wavelength fiber laser has the advantages of high performance, compact structure, low cost and low insertion loss, can simultaneously provide a plurality of wavelengths to meet the needs of a system, and is an effective scheme for reducing the number of lasers and the cost of the system. In recent years, researchers have designed various types of multi-wavelength fiber lasers, such as fiber grating-based multi-wavelength single longitudinal mode fiber lasers, few-mode multi-wavelength lasers, brillouin erbium-doped fiber lasers, and the like.
In addition, multi-wavelength lasers with tunable wavelength ranges and variable wavelength intervals have gained great attention, and their proposals have increased the flexibility of the system. The tunable multi-wavelength fiber laser with the variable wavelength interval is formed by combining the two optical fibers, is better suitable for a system, meets different requirements in an optical communication system, reduces the cost and complexity of the system, and has important significance for the development of a future communication network.
The invention uses the all-fiber structure, realizes the wavelength output in different ranges by adjusting the three polarization controllers, can flexibly change the wavelength interval of multiple wavelengths, and can also realize the change of the wavelength quantity to a certain extent.
Disclosure of Invention
The invention mainly solves the technical problem that the wavelength interval cannot be changed while the output wavelength range of many fiber lasers is tunable at present, and provides a tunable multi-wavelength fiber laser with variable all-fiber output wavelength interval.
The specific scheme adopted is as follows:
the polarization-maintaining optical fiber coupler comprises a pumping light source, a wavelength division multiplexer, a doped optical fiber, a high-nonlinearity optical fiber, an optical fiber 3dB coupler I, an optical fiber coupler II, a polarization-maintaining optical fiber I, a polarization-maintaining optical fiber II, a polarization-maintaining optical fiber III, a polarization controller I, a polarization controller II, a polarization controller III, a three-port optical fiber circulator and a polarization-related isolator.
The pump light source is connected with the input end on the right side of the wavelength division multiplexer, the port I on the left side of the wavelength division multiplexer is connected with one end of the doped optical fiber, the port II on the right side of the wavelength division multiplexer is connected with the port III of the optical fiber coupler II, and the port IV on the left side of the doped optical fiber is connected with the optical fiber circulator. And a port five of the optical fiber circulator is connected with a port on the right side of the first optical fiber 3dB coupler, and a port six and a port seven of the first optical fiber 3dB coupler are sequentially connected into the first polarization controller, the first polarization maintaining optical fiber, the second polarization controller and the second polarization maintaining optical fiber. The other port, namely the port eight, of the optical fiber circulator is connected with the polarization correlation isolator, the port nine on the right side of the polarization correlation isolator is connected with the polarization controller in three phases, and the second port on the right side of the polarization controller III is connected with the polarization-maintaining optical fiber III. And finally, connecting a port ten of the high nonlinear optical fiber with a port on the right side of the optical fiber coupler III. And the second port on the left side of the second optical fiber coupler is used as the output end of the laser.
The doped optical fiber is erbium-doped optical fiber, ytterbium-doped optical fiber and thulium-doped optical fiber.
The invention has the following effects:
a tunable multi-wavelength fiber laser with variable wavelength spacing is presented. The laser firstly uses two sections of polarization-maintaining optical fibers with different lengths and two polarization controllers to be combined to form a double-order Sagnac optical fiber filter with variable wavelength intervals, then uses a polarization-related isolator, a polarization controller and the polarization-maintaining optical fibers to form a Lyot filter, and finally cascades the two optical fiber filters. The wavelength interval can be changed by adjusting two polarization controllers in the double-order Sagnac filter with the variable wavelength interval. Adjusting the polarization controller in Lyot allows for a wide range of wavelength tuning. The polarization dependent isolator also ensures that light is transmitted in the forward direction in the loop. The four-wave mixing effect can be formed by connecting high nonlinear optical fibers, wavelength competition is inhibited, stable laser output is obtained, the number of output wavelengths can be greatly increased, and in addition, the change of the number of the wavelengths can be realized to a certain degree.
Drawings
Fig. 1 is a schematic structural diagram of a tunable multi-wavelength fiber laser with variable all-fiber wavelength intervals.
Fig. 2 is a schematic diagram of wavelength tuning of an all-fiber variable wavelength spacing tunable multi-wavelength fiber laser.
Fig. 3 is a schematic diagram of wavelength interval variation of a tunable multi-wavelength fiber laser with an all-fiber wavelength interval variable, where (a) shows a wavelength interval Δ λ and (b) shows a wavelength interval Δ λ '(Δ λ ≠ Δ λ').
Fig. 4 is a schematic diagram of the variation of the number of wavelengths of a tunable multi-wavelength fiber laser with variable all-fiber wavelength spacing, where (a) shows the number of wavelengths m (m >0) and (b) shows the number of wavelengths n (n >0) (m ≠ n).
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Implementation mode one
A tunable multi-wavelength fiber laser with variable wavelength interval is shown in figure 1 and comprises a pump light source (01), a wavelength division multiplexer (02), an erbium-doped fiber (03), a fiber circulator (04), a fiber 3dB coupler I (05), a polarization controller I (06), a polarization maintaining fiber I (07), a polarization controller II (08), a polarization maintaining fiber II (09), a polarization correlation isolator (10), a polarization controller III (11), a polarization maintaining fiber III (12), a high nonlinear fiber (13) and a fiber coupler II (14).
The pumping light source 01 is connected with an input end 021 of the wavelength division multiplexer 02, a first port 023 of the wavelength division multiplexer is connected with one end of the erbium-doped fiber 03, a second port 022 of the wavelength division multiplexer on the right side is connected with a third port 142 of the fiber coupler II, and a fourth port 041 of the erbium-doped fiber 03 is connected with the fiber circulator. Port five 042 of the fiber optic circulator is connected to the right port of fiber 3dB coupler one 05. And a first polarization controller 06, a first polarization maintaining fiber 07, a second polarization controller 08 and a second polarization maintaining fiber 09 are sequentially connected between a sixth port 052 and a seventh port 051 of the first optical fiber coupler 05. The other port 043 of the optical fiber circulator 04 is connected with the left side of the polarization-dependent isolator 10, the right port nine 101 of the polarization-dependent isolator is connected with the third polarization controller 11, and the second right port 111 of the third polarization controller 11 is connected with the third polarization-maintaining optical fiber 12. The third polarization maintaining fiber 12 is connected with the high nonlinear fiber 13, and the tenth port 131 of the high nonlinear fiber 13 is connected with the right port of the second fiber coupler 14. The second port 141 on the left side of the second fiber coupler 14 serves as the output end of the laser. The lengths of the first polarization maintaining fiber 07 and the second polarization maintaining fiber 09 are different, the length of the third polarization maintaining fiber 12 is less than 0.2 meter, and the length of the high nonlinear fiber 13 is greater than 200 meters.
The second embodiment is different from the first embodiment in that
The doped fiber 03 is an ytterbium-doped fiber, the length of the polarization-maintaining fiber III 12 is less than 0.15 meter, and the length of the high-nonlinearity fiber 13 is more than 100 meters.
The third embodiment is different from the first and second embodiments in that
The doped optical fiber 03 is a thulium-doped optical fiber, the length of the polarization maintaining optical fiber III 12 is less than 2 meters, and the length of the high nonlinear optical fiber 13 is more than 150 meters.

Claims (6)

1. A tunable multi-wavelength fiber laser with variable all-fiber wavelength interval is characterized in that:
comprises a pump light source (01), a wavelength division multiplexer (02), an erbium-doped fiber (03), a fiber circulator (04), a fiber 3dB coupler I (05), a polarization controller I (06), a polarization-maintaining fiber I (07), a polarization controller II (08), a polarization-maintaining fiber II (09), a polarization-dependent isolator (10), a polarization controller III (11), a polarization-maintaining fiber III (12), a high nonlinear fiber (13) and a fiber coupler II (14), wherein the pump light source (01) is connected with an input end (021) of the wavelength division multiplexer (02), a left port I (023) of the wavelength division multiplexer is connected with one end of the erbium-doped fiber (03), a port II (022) on the right side of the wavelength division is connected with a port III (142) of the fiber coupler II, a left port IV (041) of the erbium-doped fiber (03) is connected with the fiber circulator, a port V (042) of the fiber circulator is connected with a port I (05) on the right side of the fiber 3dB coupler I, a polarization controller I (06), a polarization maintaining fiber I (07), a polarization controller II (08) and a polarization maintaining fiber II (09) are sequentially connected between a port six (052) and a port seven (051) of a fiber coupler I (05), the other port (043) of a fiber circulator (04) is connected with the left side of a polarization related isolator (10), a right port nine (101) of the polarization related isolator is connected with a polarization controller III (11), a right second port (111) of the polarization controller III (11) is connected with a polarization maintaining fiber III (12), the polarization maintaining fiber III (12) is connected with a high nonlinear fiber (13), a port ten (131) of the high nonlinear fiber (13) is connected with a right port of a fiber coupler II (14), a left second port (141) of the fiber coupler II (14) is used as the output end of the laser, wherein the lengths of the polarization maintaining optical fiber I (07) and the polarization maintaining optical fiber II (09) are different.
2. The all-fiber variable wavelength-spaced tunable multi-wavelength fiber laser of claim 1, wherein the doped fiber (03) comprises an erbium-doped fiber, an ytterbium-doped fiber, or a thulium-doped fiber.
3. The tunable multi-wavelength fiber laser with variable all-fiber wavelength interval according to claim 1, wherein when erbium-doped fiber is used as the gain fiber, the length of the polarization-maintaining fiber three (12) is less than 0.2 m, and the length of the highly nonlinear fiber (13) is greater than 200 m.
4. The tunable multi-wavelength fiber laser with an all-fiber wavelength interval variable according to claim 1, wherein when the ytterbium-doped fiber is used as the gain fiber, the length of the polarization-maintaining fiber III (12) is less than 0.15 m, and the length of the high-nonlinearity fiber (13) is greater than 100 m.
5. The tunable multi-wavelength fiber laser with variable all-fiber wavelength interval according to claim 1, wherein when the thulium doped fiber is used as the gain fiber, the length of the polarization maintaining fiber three (12) is less than 2 meters, and the length of the highly nonlinear fiber (13) is greater than 150 meters.
6. The all-fiber variable wavelength-spaced tunable multi-wavelength fiber laser of claim 1, wherein the splitting ratio of the second fiber coupler (14) is 50: 50, 70: 30, 80: 20, or 90: 10.
CN201911021300.7A 2019-10-24 2019-10-24 Tunable multi-wavelength fiber laser with all-fiber wavelength interval variable Pending CN110635342A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111244740A (en) * 2020-02-27 2020-06-05 北京交通大学 Wavelength interval adjustable high-stability multi-wavelength fiber laser
CN113572003A (en) * 2021-07-05 2021-10-29 杭州电子科技大学 Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings
CN113687471A (en) * 2021-08-10 2021-11-23 杭州电子科技大学 Optical fiber comb filter with switchable wavelength intervals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111244740A (en) * 2020-02-27 2020-06-05 北京交通大学 Wavelength interval adjustable high-stability multi-wavelength fiber laser
CN113572003A (en) * 2021-07-05 2021-10-29 杭州电子科技大学 Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings
CN113572003B (en) * 2021-07-05 2022-04-29 杭州电子科技大学 Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings
CN113687471A (en) * 2021-08-10 2021-11-23 杭州电子科技大学 Optical fiber comb filter with switchable wavelength intervals
CN113687471B (en) * 2021-08-10 2023-09-22 杭州电子科技大学 Optical fiber comb filter with switchable wavelength interval

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