CN107026383A - A kind of tunable wave length list polarizes single-frequency circular cavity optic fibre laser - Google Patents

A kind of tunable wave length list polarizes single-frequency circular cavity optic fibre laser Download PDF

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Publication number
CN107026383A
CN107026383A CN201710479108.7A CN201710479108A CN107026383A CN 107026383 A CN107026383 A CN 107026383A CN 201710479108 A CN201710479108 A CN 201710479108A CN 107026383 A CN107026383 A CN 107026383A
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fiber
polarization
fibre
couplers
photo
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CN107026383B (en
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孙铁刚
郭玉彬
宋之磊
刘美佟
霍佳雨
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Jilin University
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Jilin University
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06708Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06712Polarising fibre; Polariser
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06791Fibre ring lasers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping

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

Abstract

A kind of tunable wave length list polarization single-frequency circular cavity optic fibre laser of the present invention belongs to fiber laser technology field, and its structure has pumping source (1), wavelength division multiplexer (2), Er-doped fiber (3), fibre optic polarizer (4), polarization maintaining optical fibre (5), bandpass filter (6), optoisolator (7), 2 × 2 photo-couplers (8), two mould graded index fibers (9), fiber optical circulator (10) and Polarization Controller (11).The present invention obtains high-quality laser output using compact simple design structure, practical, not only with single-frequency characteristic, and with single polarization characteristic, is both suitable for speed fiber optic communication systems, is suitable for Polarization-Sensitive fibre system again.

Description

A kind of tunable wave length list polarizes single-frequency circular cavity optic fibre laser
Technical field
The invention belongs to fiber laser technology field, and in particular to a kind of tunable wave length list polarizes single-frequency annular cavity optical Fibre laser.
Background technology
Optical fiber laser have high yield rate, thermal diffusivity it is good, with fibre system coupling efficiency it is high the features such as, it is logical in optical fiber The field such as letter, photoproduction microwave, Fibre Optical Sensor has wide application value, the pattern as disclosed in Chinese patent CN103852092A Interference annular chamber fiber laser sensor combines mode-interference sensing and optical-fiber laser resonance, available for displacement, temperature The sensing measurement of all kinds of physical quantitys such as degree, strain.Many longitudinal mode states being operated at current erbium doped fiber laser, which has limited it more Application in speed fiber optic communication systems, is that this researcher is proposed using phase-shifted fiber grating, anti-Gauss apodization optical fiber cloth Glug grating, ultrashort cell method, saturated absorbing body method, compound cell method etc. have single-frequency characteristic to ensure to export laser.But in mesh There are two orthogonal polarization modes preceding single frequency optical fiber laser in the prior art, which has limited it in Polarization-Sensitive optical fiber system more Application in system, is that this researcher proposes to ensure that output swashs using fibre optic polarizer, polarization-maintaining fiber grating, self-injection locking Light has single polarization characteristic.But in currently available technology, there is manufacture craft and require higher, structure in above-mentioned optical fiber laser It is complex, it is difficult to while the shortcomings of realizing single-frequency and single polarization characteristic.
Retrieved through document and new patent searching, so far there is not yet mutually isostructural tunable wave length list polarizes single-frequency annular cavity optical The patent report of fibre laser.
The content of the invention
The technical problems to be solved by the invention are that many longitudinal modes for overcoming the optical fiber laser in background technology vibrate and non- The problem of single polarization state is exported polarizes single-frequency circular cavity optic fibre laser there is provided a kind of tunable wave length list.
Technical scheme is as follows:
A kind of tunable wave length list polarizes single-frequency circular cavity optic fibre laser, its structure have pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, bandpass filter 6, optoisolator 7,2 × 2 photo-couplers 8 and fiber optical circulator 10, it is characterised in that structure is also There are fibre optic polarizer 4, polarization maintaining optical fibre 5, two mould graded index fibers 9 and Polarization Controller 11;Wherein described bandpass filtering Device 6 is tunable bandpass filters;
The output port of pumping source 1 is connected with the 980nm ports of wavelength division multiplexer 2, the 1550nm ports of wavelength division multiplexer 2 It is connected with one end of fibre optic polarizer 4, the other end of fibre optic polarizer 4 is connected with one end of polarization maintaining optical fibre 5, polarization maintaining optical fibre 5 The other end is connected with the input of bandpass filter 6, and the output end of bandpass filter 6 is connected with the input of optoisolator 7, light The output end of isolator 7 is connected with 1 port of 2 × 2 photo-couplers 8,3 ports of 2 × 2 photo-couplers 8 and two mould gradient index One end of rate optical fiber 9 is connected, and the other end of two mould graded index fibers 9 is connected with 2 ports of fiber optical circulator 10, fiber optic loop 3 ports of row device 10 are connected with one end of Polarization Controller 11, the other end of Polarization Controller 11 and 1 end of fiber optical circulator 10 Mouth is connected, and 2 ports of 2 × 2 photo-couplers 8 are connected with one end of Er-doped fiber 3, the other end and wavelength-division multiplex of Er-doped fiber 3 The public port of device 2 is connected, and 4 ports of 2 × 2 photo-couplers 8 are used as tunable wave length list polarization single-frequency annular chamber of the invention The output port of optical fiber laser.
In a kind of tunable wave length list polarization single-frequency circular cavity optic fibre laser of the present invention, described pumping source 1 is excellent 980nm pumping sources are selected, the preferred 980/1550nm wavelength division multiplexers of described wavelength division multiplexer 2,2 × 2 described photo-couplers 8 are excellent It is 30 to select splitting ratio:70 standard single-mode fiber coupler.
Beneficial effect:
1st, tunable wave length list polarization single-frequency circular cavity optic fibre laser of the present invention uses compact simple design Structure obtains high-quality laser output, practical;
2nd, tunable wave length list polarization single-frequency circular cavity optic fibre laser of the present invention not only has single-frequency characteristic, and And with single polarization characteristic, be both suitable for speed fiber optic communication systems, be suitable for Polarization-Sensitive fibre system again.
Brief description of the drawings:
Fig. 1 is that the tunable wave length list of the present invention polarizes the principle assumption diagram of single-frequency circular cavity optic fibre laser.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, being given for example only property of following examples explanation, no It is understood that as the limitation to this patent.
The concrete structure of the present invention of embodiment 1
Fig. 1 is the principle assumption diagram that tunable wave length list of the present invention polarizes single-frequency circular cavity optic fibre laser.By Pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, fibre optic polarizer 4, polarization maintaining optical fibre 5, bandpass filter 6, optoisolator 7,2 × 2 photo-couplers 8, two mould graded index fibers 9, fiber optical circulator 10, Polarization Controller 11 are constituted.
Their annexation is:The output port of pumping source 1 is connected with the 980nm ports of wavelength division multiplexer 2, and wavelength-division is multiple It is connected with the 1550nm ports of device 2 with one end of fibre optic polarizer 4, the other end of fibre optic polarizer 4 and one end of polarization maintaining optical fibre 5 It is connected, the other end of polarization maintaining optical fibre 5 is connected with the input of bandpass filter 6, the output end and optoisolator of bandpass filter 6 7 input is connected, and the output end of optoisolator 7 is connected with 1 port of 2 × 2 photo-couplers 8,3 ends of 2 × 2 photo-couplers 8 Mouth is connected with one end of two mould graded index fibers 9, the other end and the fiber optical circulator 10 of two mould graded index fibers 9 2 ports be connected, 3 ports of fiber optical circulator 10 are connected with one end of Polarization Controller 11, the other end of Polarization Controller 11 and 1 port of fiber optical circulator 10 is connected, and 2 ports of 2 × 2 photo-couplers 8 are connected with one end of Er-doped fiber 3, Er-doped fiber 3 The other end is connected with the public port of wavelength division multiplexer 2,4 ports of 2 × 2 photo-couplers 8 as whole system output port. The connection between each part uses fused fiber splice above.
Refering to Fig. 1, described pumping source 1 is 980nm pumping sources, and described wavelength division multiplexer 2 is 980/1550nm wavelength-divisions Multiplexer, pumping source 1 provides 980nm pump light signals by wavelength division multiplexer 2 for optical fiber laser;Described Er-doped fiber 3 It is the Er-doped fiber of high-gain, it functions as the gain media of optical fiber laser;Described polarization maintaining optical fibre 5 is with Gao Shuan The polarization-maintaining fiber of refracting characteristic, it and fibre optic polarizer 4 collectively constitute birefringent light fiber filter;Described bandpass filtering Device 6 is tunable bandpass filters, and it is the transmission peak position conduct for selecting birefringent light fiber filter pectination transmission spectrum that it, which is acted on, Excitation wavelength;The effect of described optoisolator 7 is to ensure that laser signal is transported along clockwise direction in fig. 1 in resonator Turn;2 × 2 described photo-couplers 8 are that splitting ratio is 30:70 standard single-mode fiber coupler, 1 end of 2 × 2 photo-couplers 8 Mouth is connected with the output end of optoisolator 7, and the single-mode tail fiber and two moulds of 3 ports (splitting ratio 30%) of 2 × 2 photo-couplers 8 are gradually One end of nonlinear refractive-index fiber 9 is connected, and 2 ports of 2 × 2 photo-couplers 8 are connected with one end of Er-doped fiber 3, and composition annular is humorous Shake chamber, and 4 ports (splitting ratio 70%) of 2 × 2 photo-couplers 8 are used as system outlet port;Two described mould graded index light Fibre 9 is only LP01And LP11Less fundamental mode optical fibre, the single-mode tail fiber and fiber optical circulator of 3 ports of it and 2 × 2 photo-couplers 8 10 2 port single-mode tail fibers collectively constitute spatial model interference filter;Described fiber optical circulator 10 is three fiber port rings Row device, its 1 port and 3 ports and the composition fiber reflector of Polarization Controller 11, for adjusting optical signal in ring resonator Polarization state, changes the coupled ratio between different mode.
The operation principle of the present invention of embodiment 2
The tunable wave length list polarization single-frequency circular cavity optic fibre laser of the present invention uses counter-pumping configuration, pumping source 1 The 980nm pump light signals sent are by wavelength division multiplexer 2 pumping, one section of Er-doped fiber 3, and optoisolator 7 is used for ensureing annular Laser signal is along operating clockwise in resonator, and reverse spontaneous emission light amplified signal (being produced by Er-doped fiber 3) enters by light The birefringent light fiber filter of fine polarizer 4 and polarization maintaining optical fibre 5 composition.Birefringent light fiber filter effectively selects single polarization Optical signal, its good polarization conserving properties is beneficial to single polarization output of optical fiber laser, while its narrow-band filtering characteristic It is beneficial to many longitudinal modes vibration for suppressing optical fiber laser.The pectination transmission spectrum wavelength interval of birefringent light fiber filter is more than or equal to The three dB bandwidth of bandpass filter 6, the centre wavelength of bandpass filter 6 is tuned to the transmission of birefringent light fiber filter pectination successively The transmission peak position of spectrum, that is, realize the selection of optical fiber laser excitation wavelength.By 3 port single mode tails of 2 × 2 photo-couplers 8 2 port single-mode tail fiber composition spatial model interference filters of fine, two mould graded index fibers 9 and fiber optical circulator 10, light 1 port of the signal through 2 × 2 photo-couplers 8 enters the spatial model interference filter based on two mould graded index fibers 9, base There was only LP in the spatial model interference filter of two mould graded index fibers 901And LP11Interfered between two patterns. Fiber optical circulator 10 and Polarization Controller 11 constitute fiber reflector, and circulation vibration had both been can adjust by adjusting Polarization Controller 11 During be again introduced into the optical signal polarization state of fibre optic polarizer 4, can change again in circulation oscillatory process between two patterns Coupled ratio.The optical signal that fiber reflector is reflected again passes by the spatial model based on two mould graded index fibers 9 Interference filter, this enhance LP01And LP11Interference between two patterns, can filter out the spuious side caused by multiple-mode interfence Mould, serves the effect for suppressing many longitudinal mode vibrations of optical fiber laser.3 ports of the optical signal through 2 × 2 photo-couplers 8 feed back to 2 × 2 ports of 2 photo-couplers 8,2 ports of 2 × 2 photo-couplers 8 are connected to form ring resonator with one end of Er-doped fiber 3, instead Present optical signal to vibrate in annular resonance cavity circulation, under birefringent light fiber filter and spatial model interference filter collective effect Many longitudinal modes vibration of optical fiber laser is effectively suppressed, and laser is believed under birefringent light fiber filter and Polarization Controller collective effect Number polarization state it is constantly optimised so that the laser of 4 ports through 2 × 2 photo-couplers 8 output has single-frequency and single polarized simultaneously Characteristic.

Claims (2)

1. a kind of tunable wave length list polarizes single-frequency circular cavity optic fibre laser, its structure has pumping source (1), wavelength division multiplexer (2), Er-doped fiber (3), bandpass filter (6), optoisolator (7), 2 × 2 photo-couplers (8) and fiber optical circulator (10), its It is characterised by, structure also has fibre optic polarizer (4), polarization maintaining optical fibre (5), two mould graded index fibers (9) and Polarization Controller (11);Wherein described bandpass filter (6) is tunable bandpass filters;
The output port of pumping source (1) is connected with the 980nm ports of wavelength division multiplexer (2), the 1550nm ends of wavelength division multiplexer (2) Mouth is connected with one end of fibre optic polarizer (4), and the other end of fibre optic polarizer (4) is connected with one end of polarization maintaining optical fibre (5), polarization-maintaining The other end of optical fiber (5) is connected with the input of bandpass filter (6), output end and the optoisolator (7) of bandpass filter (6) Input be connected, the output end of optoisolator (7) is connected with 1 port of 2 × 2 photo-couplers (8), 2 × 2 photo-couplers (8) 3 ports be connected with one end of two mould graded index fibers (9), the other end and optical fiber of two mould graded index fibers (9) 2 ports of circulator (10) are connected, and 3 ports of fiber optical circulator (10) are connected with one end of Polarization Controller (11), polarization control The other end of device (11) processed is connected with 1 port of fiber optical circulator (10), 2 ports of 2 × 2 photo-couplers (8) and Er-doped fiber (3) one end is connected, and the other end of Er-doped fiber (3) is connected with the public port of wavelength division multiplexer (2), 2 × 2 photo-couplers (8) 4 ports polarize the output port of single-frequency circular cavity optic fibre laser as the tunable wave length list of the present invention.
2. a kind of tunable wave length list polarization single-frequency circular cavity optic fibre laser according to claim 1, it is characterised in that Described pumping source (1) is 980nm pumping sources, and described wavelength division multiplexer (2) is 980/1550nm wavelength division multiplexers, described 2 × 2 photo-couplers (8) are that splitting ratio is 30:70 standard single-mode fiber coupler.
CN201710479108.7A 2017-06-22 2017-06-22 Wavelength-tunable single-polarization single-frequency ring cavity fiber laser Active CN107026383B (en)

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CN114498262A (en) * 2021-12-31 2022-05-13 北京交通大学 Multi-wavelength switchable single longitudinal mode thulium-doped fiber laser

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CN108493749A (en) * 2018-04-24 2018-09-04 南京邮电大学 A kind of Tunable Multi-wavelength Fiber Laser based on high birefringence micro-nano fiber
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